Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 312 PM EST Sat Feb 13 2021 Valid 00Z Sun Feb 14 2021 - 00Z Tue Feb 16 2021 ...Over 100 million Americans are currently under Winter Storm Warnings, Winter Storm Watches, or Winter Weather Advisories as coast-to-coast impactful winter weather is ongoing or forecast... ...Icy weather is ongoing across parts of the Mid-Atlantic, continuing through tonight... ...Major winter storm currently affecting portions of the West will spread heavy snow and significant ice accumulations to the Plains eastward early next week... ...Frigid Arctic air and dangerously cold wind chills to persist in the Heartland into next week... An extensive Arctic high will continue to cause bitterly cold temperatures across much of the CONUS through early next week, and widespread winter weather is forecast along its periphery. First, parts of the Eastern Seaboard are seeing precipitation today into tonight, and sub-freezing temperatures support the precipitation falling as freezing rain and sleet across parts of the Mid-Atlantic. Ice Storm Warnings and Winter Storm Warnings are in effect across northern North Carolina into much of Virginia, D.C., and parts of Maryland. Storm total freezing rain amounts could accumulate to a quarter inch, with locally higher amounts of a half inch possible. Accumulations of this magnitude will likely lead to downed tree limbs and power outages, as well as dangerous travel conditions. Meanwhile farther south, precipitation should stay rain across the Southeast, but rain and thunderstorms could be heavy across parts of Florida and southern Georgia. Marginal Risks of severe weather and flash flooding are in place today, with a Slight Risk of severe weather in place for portions of Florida tomorrow, with warm conditions south of a stationary front. In the West, snowy and icy conditions are ongoing as Pacific moisture interacts with the cold air in place. Even the lower elevations of the Pacific Northwest, including Seattle and Portland, have seen snow with this event. Precipitation may wind down there tonight before another low pressure system approaches and moves through the West, leading to additional precipitation. As the upper-level trough associated with the first wave of precipitation drops southeastward through the Four Corners region, it will combine with some Gulf of Mexico moisture to produce widespread snow across parts of the Central/Southern Rockies and Central/Southern Plains by Sunday, spreading into the Mississippi and Ohio Valleys by Monday. Snow totals of several inches are forecast across much of Oklahoma and into northern Texas. South and east of the snow nearer to the Gulf Coast, an icy wintry mix is expected. Significant freezing rain is a threat, and the current forecast shows accumulations over a quarter of an inch across central Louisiana and Mississippi. Snow and ice are then forecast to track into the northeastern U.S. later Monday into Tuesday. Underneath the aforementioned Arctic surface high pressure system, the bulk the country especially east of the Rockies will continue to see dangerous and record-breaking cold into the first part of next week. The north-central U.S. should once again see high temperatures below 0F on Sunday, with single digit highs stretching as far south as the Texas Panhandle. Low temperatures are forecast to be as cold as -30 degrees in the Northern Plains to Upper Midwest. Add in gusty winds and the result is life-threatening wind chills between -30 to -60 in the north-central CONUS. Wind Chill Advisories extend as far south as the Southern Plains. Hundreds of daily low maximum and minimum temperatures will be broken, with some February and even all-time low temperature records in jeopardy. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php