See how the changing definition of a climate normal affects our interpretation of future climate changes in an interactive tool.
MARISA Mid-Atlantic Regional Climate Impacts Summary and Outlook: Fall 2021
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Tropical Storm Ida brought significant rainfall and its remnants produced multiple damaging tornadoes. Temperatures were warmer than normal across the region, with moderate drought in southeastern Virginia.
Read more about regional climate trends, and how the changing definition of a climate normal affects our interpretation of future climate changes, in the latest MARISA Seasonal Climate Impacts Summary and Outlook.
Highlights
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Tropical Storm Ida brought significant rainfall to the region with the greatest rainfall totals in the watershed ranging from 5 to 8 inches in parts of central and northern Maryland and central and eastern Pennsylvania. -
Temperatures were on average a bit above normal across the region for the fall season, due to a warmer September and October but a generally cooler November.
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Central and northern parts of the region experienced above-normal precipitation, while southern parts experienced below-normal precipitation.
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Abnormal dryness persisted through November in portions of Virginia and southern Maryland and moderate drought was introduced in southeastern Virginia.
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In an analysis of future differences from normal temperature, the use of the 1981–2010 "old" normal shows over a half-degree greater increase in future average annual temperature compared to the newly-released 1991–2020 normal.
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