Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 258 AM EST Wed Jan 10 2018 Valid 12Z Wed Jan 10 2018 - 12Z Fri Jan 12 2018 ...Winter storm will unfold across the Plains and move eastward into the Ohio Valley... Precipitation will continue across the Intermountain West through most of Wednesday--falling as rain and higher elevation snow. Precipitation will being to spread across the northern and portions of the central Plains later into Wednesday night and early Thursday morning. Cold air from the Arctic high pressure spilling into the central U.S. will allow this precipitation to fall as snow. As the frontal system associated with this winter storm progresses eastward, the bulk of precipitation will also follow. However, by late Wednesday night and into early Thursday morning, areas near the rain/snow line will begin to see wintry mix especially in the middle Mississippi Valley. This wintry mix will increase as it moves into the Ohio Valley on Friday. The lower Mississippi Valley and Southeast can expect rainfall on Thursday night/Friday morning. Meanwhile, snow will move from the northern/central Plains on Wednesday into the middle Mississippi Valley and Upper Midwest by Thursday. Snow will be mainly confined to the Great lakes region on Friday morning before it increases in the Ohio Valley--beyond the short term period. For all information regarding this winter storm, please consult WPC's winter weather products. Most of the eastern half of the U.S. will experience warmer than normal high temperatures on Wednesday--especially in the Plains. However, once the Arctic high pressure nudges into the northern Plains on Thursday, much colder temperatures will reintroduce themselves in the Plains--while the warmer temperatures continue across the Great Lakes and Northeast. Most of the East Coast will experience warm temperatures for this time of year on Friday--while the central portion of the country will be cold as the winter storm sweeps across those regions. Reinhart Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php