Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 150 AM EST Tue Feb 18 2020 Valid 12Z Tue Feb 18 2020 - 12Z Thu Feb 20 2020 ...Additional heavy rains likely across flood ravaged areas of the South... ..Accumulating snows possible Tuesday from northern New York State into northern New England... ...A broad region of arctic high pressure will settle south into the Northern to Central Plains Tuesday, Wednesday and Thursday... A surface frontal boundary pushing southeast from the Lower Mississippi Valley/Tennessee Valley region into the Southeast Tuesday into Wednesday will be accompanied by bands of heavy rains along and ahead of the front. These rains will be falling across areas of the South that are experiencing historic flooding, exacerbating these flooding conditions. Drier weather likely Wednesday across the hardest hit flooding regions of Mississippi, but additional rains may push back into this region late Wednesday night into Thursday. An area of low pressure is forecast to push east northeastward from the upper Great Lakes into southeast Canada on Tuesday. This low will support an area of accumulating snows from northern New York State into northern New England. The quick movement of the storm should keep snowfall totals from being very heavy, with mostly moderate to locally heavy totals expected. In the wake of the low moving northeastward from the upper Lakes region, a broad region of arctic high pressure will be sinking southward into the Northern to Central Plains region Tuesday, Wednesday and Thursday. This cold airmass will spread below average temperatures across much of the Plains Tuesday and Wednesday, spreading eastward through the Mississippi Valley and the remainder of the east by Thursday. Oravec Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php