Persistent arctic air is forecast to break numerous daily records and produce dangerously cold sub-zero wind chills across the Central and Southern Plains, Lower Mississippi Valley, and the Southeast U.S. today. An atmospheric river will bring heavy rain and mountain snow to the Pacific Northwest states and northern Rockies today through at least Tuesday. Read More >
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Coverage Map Notes
The coverage statistics and maps are calculated using a computer model and station data assuming ideal conditions. Coverage may be 5 to 10 percent below the computer predicted coverage for the following reasons:
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