Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 323 AM EST Sun Jan 14 2024 Valid 12Z Sun Jan 14 2024 - 12Z Tue Jan 16 2024 ...Dangerous cold temperatures to persist across much of the U.S... ...Significant, impactful wintry precipitation to develop over the Mid-South later today... ...Significant wintry weather winding down over the Pacific Northwest and Great Basin... In the wake of the strong Midwest frontal system earlier this weekend, the weather story across much of the Lower 48 is tied to an expansive area of Arctic high pressure spilling out of the Canadian prairie, which is responsible for dangerously cold temperatures extending from the Pacific Northwest all the way into the Rust Belt. To highlight just how intense this outbreak of Arctic air is, over 95 million citizens fall within a Wind Chill Warning, Advisory, or Watch as of midnight tonight. Some of the coldest temperatures associated with this outbreak may occur today, where bitterly cold wind chills as low as 70 below are expected across Montana and the Dakotas. Further south, wind chills plummeting below minus 30 degrees will be found across the Rockies, central Plains, and mid-Mississippi Valley. Unfortunately, the dangerous cold weather could stick around for the next several days as reinforcing cold air plunges the front southward, which could yield additional record breaking, dangerously low temperatures over parts of the Midwest and Deep South through mid-late next week. Brutal cold aside, the Arctic air in place will also set the stage for significant wintry precipitation to develop over the Mid-South later today with a mess of snow, sleet, and freezing rain all expected. Through Tuesday, the current forecast calls for 3-6 inches of snowfall over portions of the Ozarks into the Tennessee Valley, with a tenth of an inch of ice possible further to the south in the Lower Mississippi Valley. The prolonged nature of this event could result in moderate to major potential winter storm impacts over parts of Arkansas, northwest Mississippi, and western Tennessee, where Winter Storm Warnings are in effect. Meanwhile to the northeast, the Arctic blast will maintain heavy lake effect snowfall downwind of the Great Lakes (focused over western and northern New York State), while also producing snow showers or squalls over the Northeast and northern Mid-Atlantic today. Otherwise, the significant snow and freezing rain over the Pacific Northwest and Great Basin is winding down and will subside today. After a significant episode of freezing rain, sleet, and snow yesterday, conditions are expected to improve as the upper-trough responsible for the precipitation pulls away to the east, with most of the Winter Storm Warnings over the Pacific Northwest and western Great Basin set to expire this morning. The same system will produce heavy mountain snowfall in Utah and western Colorado however, with moderate to major potential winter storm impacts expected today in the terrain as snow levels remain on the floor. Asherman Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php