National Current Conditions
Flash drought is taking hold in parts of the Atlantic Coast, Southeast, and Southern Plains. The Midwest is seeing both flash drought (Ohio Valley) and flooding (Upper Midwest). The Northwest and Northern Rockies also saw drought expand. As of June 25, 2024, 13.63% of the U.S. and Puerto Rico and 16.13% of the lower 48 states are in drought, according to the U.S. Drought Monitor.
of the U.S. and 16.13% of the lower 48 states are in drought this week.
acres of major crops in U.S. are experiencing drought conditions this week.
people in the U.S. and 44.4 Million in the lower 48 states are affected by drought this week.
U.S. states are experiencing Moderate Drought (D1) or worse this week.
U.S. Drought Monitor
U.S. Drought Monitor
D0 - Abnormally Dry
Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1 – Moderate Drought
Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2 – Severe Drought
Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3 – Extreme Drought
Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4 – Exceptional Drought
Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.
Drought Change Since Last Week
3-Category Degradation
Drought/dryness has worsened by 3 categories, according to the U.S. Drought Monitor.
2-Category Degradation
Drought/dryness has worsened by 2 categories, according to the U.S. Drought Monitor.
1-Category Degradation
Drought/dryness has worsened by 1 category, according to the U.S. Drought Monitor.
No Change
There has been no change in drought conditions at this location.
1-Category Improvement
Drought/dryness has improved by 1 category, according to the U.S. Drought Monitor.
2-Category Improvement
Drought/dryness has improved by 2 categories, according to the U.S. Drought Monitor.
3-Category Improvement
Drought/dryness has improved by 3 categories, according to the U.S. Drought Monitor.
The U.S. Drought Monitor depicts the location and intensity of drought across the country using 5 classifications: Abnormally Dry (D0), showing areas that may be going into or are coming out of drought, and four levels of drought (D1–D4).
The U.S. Drought Monitor is a joint effort of the National Drought Mitigation Center, U.S. Department of Agriculture, and National Oceanic and Atmospheric Administration.
The U.S. Drought Monitor 1-week change map shows where drought has improved, remained the same, or worsened since the previous week's Drought Monitor. Yellow/orange hues show areas where drought worsened, while green hues show drought improvement.
The U.S. Drought Monitor map is released every Thursday morning, with data valid through Tuesday at 7 am Eastern.
U.S. Drought Monitor change maps are released every Thursday morning, with data valid through Tuesday at 7 am Eastern.
A drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreA drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MorePrecipitation Conditions
Inches of Precipitation
This location received less than 0.01 inch of precipitation during this 7-day period.
This location received 0.01–0.5 inch of precipitation during this 7-day period.
This location received 0.5–1 inch of precipitation during this 7-day period.
This location received 1–2 inches of precipitation during this 7-day period.
This location received 2–4 inches of precipitation during this 7-day period.
This location received 4–6 inches of precipitation during this 7-day period.
This location received 6–8 inches of precipitation during this 7-day period.
This location received more than 8 inches of precipitation during this 7-day period.
Percent of Normal Precipitation (%)
<25% of Normal
Precipitation was only 0% to 25% of the historical average for this location, compared to the same date range from 1991–2020.
25%–50% of Normal
Precipitation was 25% to 50% of the historical average for this location, compared to the same date range from 1991–2020.
50%–75% of Normal
Precipitation was 50% to 75% of the historical average for this location, compared to the same date range from 1991–2020.
75%–100% of Normal
Precipitation was 75% to 100% of the historical average for this location, compared to the same date range from 1991–2020.
100%–150% of Normal
Precipitation was 100% to 150% of the historical average for this location, compared to the same date range from 1991–2020.
150%–200% of Normal
Precipitation was 150% to 200% of the historical average for this location, compared to the same date range from 1991–2020.
200%–300% of Normal
Precipitation was 200% to 300% of the historical average for this location, compared to the same date range from 1991–2020.
>300% of Normal
Precipitation was greater than 300% of the historical average for this location, compared to the same date range from 1991–2020.
Percent of Normal Precipitation (%)
<25% of Normal
Precipitation was only 0% to 25% of the historical average for this location, compared to the same date range from 1991–2020.
25%–50% of Normal
Precipitation was 25% to 50% of the historical average for this location, compared to the same date range from 1991–2020.
50%–75% of Normal
Precipitation was 50% to 75% of the historical average for this location, compared to the same date range from 1991–2020.
75%–100% of Normal
Precipitation was 75% to 100% of the historical average for this location, compared to the same date range from 1991–2020.
100%–150% of Normal
Precipitation was 100% to 150% of the historical average for this location, compared to the same date range from 1991–2020.
150%–200% of Normal
Precipitation was 150% to 200% of the historical average for this location, compared to the same date range from 1991–2020.
200%–300% of Normal
Precipitation was 200% to 300% of the historical average for this location, compared to the same date range from 1991–2020.
>300% of Normal
Precipitation was greater than 300% of the historical average for this location, compared to the same date range from 1991–2020.
This map shows total precipitation (in inches) for the past 7 days. Dark blue shades indicate the highest precipitation amounts.
This map shows precipitation for the past 30 days as a percentage of the historical average (1991–2020) for the same time period. Green/blue shades indicate above-normal precipitation, while brown shades indicate below-normal precipitation.
This map shows precipitation for the past 60 days as a percentage of the historical average (1991–2020) for the same time period. Green/blue shades indicate above-normal precipitation, while brown shades indicate below-normal precipitation.
Precipitation data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Precipitation data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Precipitation data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Drought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreTemperature Conditions
Maximum Temperature (°F)
<0°F
The 7-day average daily maximum temperature is below 0°F.
0–10°F
The 7-day average daily maximum temperature is between 0–10°F.
10–20°F
The 7-day average daily maximum temperature is between 10–20°F.
20–30°F
The 7-day average daily maximum temperature is between 20–30°F.
30–40°F
The 7-day average daily maximum temperature is between 30–40°F.
40–60°F
The 7-day average daily maximum temperature is between 40–60°F.
60–70°F
The 7-day average daily maximum temperature is between 60–70°F.
70–80°F
The 7-day average daily maximum temperature is between 70–80°F.
80–90°F
The 7-day average daily maximum temperature is between 80–90°F.
90–100°F
The 7-day average daily maximum temperature is between 90–100°F.
>100°F
The 7-day average daily maximum temperature is between greater than 100°F.
Departure from Normal Max Temperature (°F)
>8°F Below Normal
The average maximum temperature was more than 8°F colder than normal for this location.
6–8°F Below Normal
The average maximum temperature was 6–8°F colder than normal for this location.
4–6°F Below Normal
The average maximum temperature was 4–6°F colder than normal for this location.
3–4°F Below Normal
The average maximum temperature was 3–4°F colder than normal for this location.
1–3°F Below Normal
The average maximum temperature was 1–3°F colder than normal for this location.
0–1°F Below Normal
The average maximum temperature was 0–1°F colder than normal for this location.
0–1°F Above Normal
The average maximum temperature was 0–1°F warmer than normal for this location.
1–3°F Above Normal
The average maximum temperature was 1–3°F warmer than normal for this location.
3–4°F Above Normal
The average maximum temperature was 3–4°F warmer than normal for this location.
4–6°F Above Normal
The average maximum temperature was 4–6°F warmer than normal for this location.
6–8°F Above Normal
The average maximum temperature was 6–8°F warmer than normal for this location.
>8°F Above Normal
The average maximum temperature was more than 8°F warmer than normal for this location.
Departure from Normal Max Temperature (°F)
>8°F Below Normal
The average maximum temperature was more than 8°F colder than normal for this location.
6–8°F Below Normal
The average maximum temperature was 6–8°F colder than normal for this location.
4–6°F Below Normal
The average maximum temperature was 4–6°F colder than normal for this location.
3–4°F Below Normal
The average maximum temperature was 3–4°F colder than normal for this location.
1–3°F Below Normal
The average maximum temperature was 1–3°F colder than normal for this location.
0–1°F Below Normal
The average maximum temperature was 0–1°F colder than normal for this location.
0–1°F Above Normal
The average maximum temperature was 0–1°F warmer than normal for this location.
1–3°F Above Normal
The average maximum temperature was 1–3°F warmer than normal for this location.
3–4°F Above Normal
The average maximum temperature was 3–4°F warmer than normal for this location.
4–6°F Above Normal
The average maximum temperature was 4–6°F warmer than normal for this location.
6–8°F Above Normal
The average maximum temperature was 6–8°F warmer than normal for this location.
>8°F Above Normal
The average maximum temperature was more than 8°F warmer than normal for this location.
This map shows the average maximum daily temperature (°F) for the last 7 days. Blue hues indicate cooler temperatures, while red hues indicate warmer temperatures.
This map shows the average maximum daily temperature for the past 7 days compared to the historical average (1991–2020) for the same 7 days. Negative values (blue hues) indicate colder than normal temperatures, and positive values (red hues) indicate warmer than normal temperatures.
This map shows the average maximum daily temperature for the past 30 days compared to the historical average (1991–2020) for the same 30 days. Negative values (blue hues) indicate colder than normal temperatures, and positive values (red hues) indicate warmer than normal temperatures.
Temperature data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Temperature data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Temperature data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Air temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreAir temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreAir temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreMulti-Indicator Drought Index (MIDI)
Dry Conditions
D4: Exceptional Drought
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 98% to 100% of past conditions. Learn more about these categories.
D3: Extreme Drought
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 95% to 98% of past conditions. Learn more about these categories.
D2: Severe Drought
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 90% to 95% of past conditions. Learn more about these categories.
D1: Moderate Drought
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 80% to 90% of past conditions. Learn more about these categories.
D0: Abnormally Dry
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 70% to 80% of past conditions. Learn more about these categories.
Wet Conditions
W0: Abnormally Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 70% to 80% of past conditions. Learn more about these categories.
W1: Moderate Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 80% to 90% of past conditions. Learn more about these categories.
W2: Severe Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 90% to 95% of past conditions. Learn more about these categories.
W3: Extreme Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 95% to 98% of past conditions. Learn more about these categories.
W4: Exceptional Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 98% to 100% of past conditions. Learn more about these categories.
Dry Conditions
D4: Exceptional Drought
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 98% to 100% of past conditions. Learn more about these categories.
D3: Extreme Drought
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 95% to 98% of past conditions. Learn more about these categories.
D2: Severe Drought
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 90% to 95% of past conditions. Learn more about these categories.
D1: Moderate Drought
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 80% to 90% of past conditions. Learn more about these categories.
D0: Abnormally Dry
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 70% to 80% of past conditions. Learn more about these categories.
Wet Conditions
W0: Abnormally Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 70% to 80% of past conditions. Learn more about these categories.
W1: Moderate Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 80% to 90% of past conditions. Learn more about these categories.
W2: Severe Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 90% to 95% of past conditions. Learn more about these categories.
W3: Extreme Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 95% to 98% of past conditions. Learn more about these categories.
W4: Exceptional Wet
This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 98% to 100% of past conditions. Learn more about these categories.
The Multi-Indicator Drought Index (MIDI) looks at current drought conditions across the U.S. by integrating several key drought indices on precipitation and moisture into one objective, computer-generated map.
The Short-Term MIDI approximates drought impacts from changes in precipitation and moisture over a short-term timeframe (looking back up to 90 days), such as impacts to non-irrigated agriculture, topsoil moisture, and range and pasture conditions. Long-term droughts (lasting months to years) can have different impacts.
This experimental map is based on methodology from the NOAA National Weather Service’s Climate Prediction Center. Learn how this map is made.
The Multi-Indicator Drought Index (MIDI) looks at current drought conditions across the U.S. by integrating several key drought indices on precipitation and moisture into one objective, computer-generated map.
The Long-Term MIDI approximates drought impacts from changes in precipitation and moisture over a long-term timeframe (up to 5 years), such as impacts to irrigated agriculture, groundwater, and reservoir levels. Long-term drought conditions can also increase wildfire intensity and severity.
This experimental map is based on methodology from the NOAA National Weather Service’s Climate Prediction Center. Learn how this map is made.
The drought indices used in this map are based on the GridMET dataset and use a reference period of 1979–present. This map is updated every 5 days, with a delay of 4 to 5 days to allow for data collection and quality control.
The drought indices used in this map are based on the GridMET dataset and use a reference period of 1979–present. This map is updated every 5 days, with a delay of 4 to 5 days to allow for data collection and quality control.
A drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreA drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MorePalmer Drought Severity Index (PDSI)
Dry Conditions
Wet Conditions
The Palmer Drought Severity Index (PDSI) is a drought index based on a simplified soil water balance and estimates relative soil moisture conditions. PDSI values indicate the severity of departure from normal conditions—a PDSI value >4 represents very wet conditions, while a PDSI <-4 represents an extreme drought. This map uses a new, experimental methodology for sub-monthly PDSI.
PDSI data are updated every 5 days, with a delay of 4 to 5 days.
A drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MoreAir temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreEvaporative Demand Drought Index (EDDI)
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Evaporative Demand Drought Index is updated daily, with a 5-day delay. This delay results from the procedures to quality control the meteorological data used to estimate evaporative demand.
The Evaporative Demand Drought Index is updated daily, with a 5-day delay. This delay results from the procedures to quality control the meteorological data used to estimate evaporative demand.
A drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MoreFlash drought is the rapid onset or intensification of drought. Unlike slow-evolving drought, which is caused by a decline in precipitation, flash drought occurs when low precipitation is accompanied by abnormally high temperatures, high winds, and/or changes in radiation. These sometimes-rapid changes can quickly raise evapotranspiration rates and remove available water from the landscape.
Learn MoreDrought can result in reduced growth rates, increased stress on vegetation, and alterations or transformations to the plant community and/or the entire ecosystem. During periods of drought, plants increase their demand for water through increased evapotranspiration and longer growing seasons.
Learn MoreDuring drought conditions, fuels for wildfire, such as grasses and trees, can dry out and become more flammable. Drought can also increase the probability of ignition and the rate at which fire spreads. Temperature, soil moisture, humidity, wind speed, and fuel availability (vegetation) are all factors that interact to influence the frequency of large wildfires.
Learn MoreA drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MoreFlash drought is the rapid onset or intensification of drought. Unlike slow-evolving drought, which is caused by a decline in precipitation, flash drought occurs when low precipitation is accompanied by abnormally high temperatures, high winds, and/or changes in radiation. These sometimes-rapid changes can quickly raise evapotranspiration rates and remove available water from the landscape.
Learn MoreDrought can result in reduced growth rates, increased stress on vegetation, and alterations or transformations to the plant community and/or the entire ecosystem. During periods of drought, plants increase their demand for water through increased evapotranspiration and longer growing seasons.
Learn MoreDuring drought conditions, fuels for wildfire, such as grasses and trees, can dry out and become more flammable. Drought can also increase the probability of ignition and the rate at which fire spreads. Temperature, soil moisture, humidity, wind speed, and fuel availability (vegetation) are all factors that interact to influence the frequency of large wildfires.
Learn MoreTell us how drought is impacting your community by submitting a condition monitoring report. Your submissions help us better understand how drought is affecting local conditions.