Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 255 PM EST Sun Nov 22 2020 Valid 00Z Mon Nov 23 2020 - 00Z Wed Nov 25 2020 ...Low pressure system produces rain over the Ohio Valley and Lower Great Lakes... ...Light snow and scattered freezing rain will change over to rain over parts of the Northeast... ...Wintry Tuesday in the Upper Midwest, stormy in the South Central U.S; Pacific storm ushers wet conditions into the Northwest.... A low pressure system in central Ohio is tracking northeast towards the northern Mid-Atlantic this evening. A band of snow is leading to some light snow accumulations in southeast Michigan where Winter Weather Advisories are in effect this afternoon. Showers and a few thunderstorms are positioned parallel along an elongated cold front extending into the Lower Mississippi Valley. Precipitation will advance into the Northeast tonight with a wintry mix possible across northern New England while the associated cold front produces showers and perhaps a thunderstorm or two along the East Coast early Monday morning. Cooler and drier conditions return to the East Coast late Monday into Tuesday as high pressure builds in behind the passing cold front. While the East Coast trends drier the first half of the week, the pattern gets busier out west as an upper-level trough track into the West coast on Monday. By Monday evening, the upper trough becomes increasingly amplified and an area of low pressure takes shape in the central High Plains. As the storm strengthens, precipitation blossoms over the central Rockies and Plains Monday afternoon. Snow rates will intensify over the Colorado Rockies and heavy snow totals over a foot possible in the highest peaks. By Tuesday, as the storm continues to deepen, a shield of precipitation will engulf much of the Upper Midwest while scattered showers extend south into central Texas. A lingering frontal boundary may act as a rain/snow line with light snow accumulations possible in the Upper Midwest and central Great Lakes. Meanwhile, the warm sector of the storm and a potent cold front surging south and east fosters an environment favorable for thunderstorms in the central Plains and Lower Mississippi Valley. Some thunderstorms may be severe late in the day. Tuesday also looks unsettled in the Pacific Northwest as yet another Pacific storm system escorts another round of coastal/valley rain and mountain snow into the region. Mullinax Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php