Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 253 PM EST Sun Feb 10 2019 Valid 00Z Mon Feb 11 2019 - 00Z Wed Feb 13 2019 ...Heavy rainfall and flash flooding possible from the Mid-Mississippi Valley to the Tennessee Valley... ...Potentially significant winter storm likely to impact the Midwest to the Northeast early this week... ...A series of winter storms will impact the Western U.S.... Deep moisture interacting with a frontal boundary draped across the Ohio Valley will continue to produce widespread rainfall, with embedded thunderstorms, through Tuesday from the lower Mississippi Valley to the Tennessee Valley and the Mid-Atlantic. The heaviest rainfall is expected to fall from central Arkansas to western Kentucky, where rainfall of 1 to 2+ inches is forecast. Flash flooding will be a threat with this event, and WPC has highlighted a slight to moderate risk of excessive rainfall across this region. A wintry mix is also possible along the northern edge of the precipitation shield from the Ohio Valley to the northern Mid-Atlantic with mainly light to moderate accumulations of snow and ice possible. The same upper level system responsible for the heavy rainfall across the Tennessee Valley will spin-up a surface low pressure system in the Central Plains on Monday. Along with heavy rainfall to the South, this storm will also bring widespread moderate to heavy snowfall to portions of the Midwest and Great Lakes on Monday and Tuesday, eventually spreading into the Northeast. Snowfall accumulations of 6 to 10 inches, with locally higher amounts are likely across the Midwest on Tuesday, with even higher amounts expected into northern New England as this system continues beyond the short range period. A series of winter storms impacting the Western U.S. will continue to bring rounds of widespread snowfall to much of the Pacific Northwest, California, and into the Intermountain West. Given cold air locked in place, snow levels remain low with accumulating snowfall likely near or just above sea level, including the greater Seattle and Portland metro areas. The most significant snowfall is expected in the higher terrain of the Washington/Oregon Cascades where upwards of a foot or more of snow is likely. Temperatures are expected to remain well below average from the Pacific Northwest to the Dakotas through Monday, with widespread subzero lows from the northern Rockies to northern Minnesota likely. Temperatures should warm to above average Monday and Tuesday across the South and into the Ohio Valley and Eastern U.S. following the passage of a warm front. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php