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Document Date
December 23, 2020
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Quarterly Climate Impacts and Outlook for the Midwest Region for September – November 2020. Dated December 2020.

Precipitation totals in the Midwest ranged from less than 50% of normal in northwestern Minnesota to more than 150% of normal in eastern Iowa. Many areas were near normal. Fall temperatures were within 2°F of normal across the Midwest. After more than 1,000 record low daily temperatures in the last half of October, the first 11 days of November saw more than 1,500 record-high daily temperatures.

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Document Date
December 21, 2020
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Quarterly Climate Impacts and Outlook for Alaska and Northwestern Canada for September – November 2020; outlook for January – March 2021. Dated December 2020. 

A strong storm moved from the northwest Bering Sea, across Chukotka and into the southwest Chukchi Sea November 5 to 7. The storm brought snow and rain to St. Lawrence Island, the Bering Strait and most of the Seward Peninsula.  Heavy snow also fell over parts of Interior Alaska on November 5-7 from the same storm system.

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Document Date
December 21, 2020
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Quarterly Climate Impacts and Outlook for the Chesapeake Bay Region for September – November 2020. Dated December 2020.
https://www.midatlanticrisa.org/climate-summaries/2020/12.html

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Document Date
December 21, 2020
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Quarterly Climate Impacts and Outlook for the Missouri River Basin September – November 2020. Dated December 2020.

Autumn 2020 was one of the driest on record for several states, including North Dakota (3rd), Colorado (9th), Nebraska (9th), Kansas (19th), and South Dakota (20th). Although temperatures were, overall, near normal, autumn had many extremes.

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Document Date
December 21, 2020
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Quarterly Climate Impacts and Outlook for the Great Lakes Region for September – November 2020.  Dated December 2020.

While conditions were overall fairly normal throughout the fall, record-setting warmth, especially in the first half of November, was the most notable event this season. Fall precipitation was below or near average, with the basin seeing 87% of average.

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Document Date
December 18, 2020
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Quarterly Climate Impacts and Outlook for the Southeast Region for September – November 2020. Dated December 2020.

Well-above-average temperatures were observed across the Southeast, driven primarily by excessively warm daily minimum temperatures. Precipitation was above average across much of the region. Several long-term stations observed their wettest autumn on record.

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Document Date
December 18, 2020
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Quarterly Climate Impacts and Outlook for the Gulf of Maine Region for September – November 2020. Dated December 2020.

Autumn was up to 2°C (4°F) warmer than normal. This autumn was among the 10 warmest on record for Caribou and Portland, ME. Autumn precipitation ranged from 50% of normal to near normal for a majority of the region.

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Document Date
December 18, 2020
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Quarterly Climate Impacts and Outlook for the Southern Region for September – November 2020. Dated December 2020.

Temperatures were below normal across much of the region in September and October, but November temperatures were above normal across the entire region. Precipitation was slightly above normal in September, but widespread areas received below normal precipitation in October and November.

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Document Date
December 18, 2020
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Quarterly Climate Impacts and Outlook for the Northeast Region for September – November 2020.  Dated December 2020.

The Northeast had its 11th-warmest autumn at 1.9°F above normal. This autumn ranked among the 15 warmest on record for all 12 Northeast states. The Northeast saw 85% of normal autumn precipitation, ranking in the middle third of all years.

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Document Date
December 18, 2020
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Quarterly Climate Impacts and Outlook for the Western Region for September – November 2020.  Dated December 2020.

Temperatures were above-average during the fall west of the Rocky Mountains, favored by a strong high pressure ridge anchored along the coast. Although fall is typically dry in the southern half of the West, the persistent ridge prevented landfalling Pacific storms, leading to well-below normal precipitation in many regions.