As of Thursday morning, December 11, winter storm warnings or winter weather advisories cover a swath of the country including Montana, North Dakota, South Dakota, Minnesota, Iowa, Illinois, Indiana, Ohio and Kentucky, with additional advisories for northern Michigan, Pennsylvania, New York and Vermont.
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Dangerous Arctic Air Surges South, Bringing Record Cold
Afternoon high temperatures on Friday and Saturday are expected to run 20 to 30 degrees below average, with the NWS noting that record low afternoon highs are possible across parts of the Northern Plains and Upper Mississippi Valley on Saturday and more widespread record cold likely on Sunday. This push of Arctic air will reinforce the risk of dangerous wind chills, refreezing moisture on untreated roads and extending hazardous travel conditions well beyond the initial snowfall.
The NWS says accumulating snow is likely today into early Friday as a fast-moving area of low pressure drops from the Central Plains into the Ohio Valley. Forecasters expect:
A narrow band of 2–4 inches of snow on the northern side of the stormWidespread 3-inch totals across much of the U.S. over the next three daysHigher totals in Montana and parts of the Northeast, where lake-effect snow will add to accumulationsIce Storm Concerns
Farther west, freezing rain is causing significant issues:
An ice storm warning in South Dakota warns of “significant icing”Freezing rain continues to create hazardous travel in northern Montana, South Dakota and NebraskaUp to one-tenth of an inch of ice is possible in parts of the Dakotas and eastern MontanaRELATED: Winter Storm Warnings Active Across Multiple States With ‘Life-Threatening’ Conditions
Washington Gov. Bob Ferguson has declared a state of emergency, warning that “lives will be at stake in the coming days.” FEMA response teams are now on the ground following reports of more than a foot of rain in some communities.
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Rain, Snow, and a Mix: What’s Falling Where
Montana is seeing mostly rain with some pockets of snowNorthern Plains and Upper Midwest are dealing with freezing rainNortheast is experiencing a mix of snow and lake-effect enhancement
Radar imagery and windy.com animations show the storm already in progress, with more precipitation expected as the system deepens and shifts east.
Forecast confidence will tighten as the storm evolves, but meteorologists expect shifting precipitation types and hazardous travel conditions into the weekend.
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