Frigid Temperatures with Dangerous Wind Chills; Heavy Rain and Flooding

An arctic cold front will continue to plunge southward through the Plains, Mississippi Valley and the Northwest quadrant of the U.S. on Sunday. As a result, widespread frigid and well below normal temperatures are expected along with dangerous wind chills. Meanwhile, heavy rain and flooding are possible for the Gulf Coast states and much of Hawaii. Read More >

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Wind Chill Chart

Cold Wind Chills:
Wind Chill Warning: (See a map of Wind Chill Warning thresholds)
Wind Chill Advisory: (See a map of Wind Chill Advisory thresholds)

heat index chart

Heat Advisory: (See a map of Heat Advisory Criteria)
Excessive Heat Warning: (See a map of Excessive Heat Warning Criteria)
Excessive Heat Watch: Possibility that Excessive Heat Warning Criteria may be met at longer ranges (12 to 48 hrs out).

For an outlook beyond 3-4 days, see the extended heat index guidance we get from the NWS's Hydrometeorological Prediction Center (HPC):
Maximum HEAT INDEX OUTLOOKS (for days 3-7) from the NWS Hydrometeorological Prediction Center (HPC) in DC.

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