Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 226 AM EDT Tue Mar 24 2020 Valid 12Z Tue Mar 24 2020 - 12Z Thu Mar 26 2020 ...Flash flooding and severe weather possible Tuesday across the Tennessee Valley into the Southern Appalachians... ...A showery pattern with continued below average temperatures across much of the West, while above average temperatures stretch across the South and the Plains... ...Accumulating snows possible Wednesday into early Thursday across portions of the Northern Plains, Upper Mississippi Valley into the Upper Great Lakes... Precipitation is expected to continue to expand in coverage and intensity Tuesday as a quick moving area of low pressure moves from the Southern Plains, across the Lower Mississippi Valley and into the Tennessee Valley. This area of low pressure will have above average levels of moisture associated with it resulting in a large stripe of heavy rains stretching from the Lower Mississippi Valley, across the Tennessee Valley, Southern Appalachians and Southern Mid-Atlantic. The greatest risk of flash flooding with this storm will be across portions of the Upper Tennessee Valley into the Southern Appalachians where soils are saturated from heavy rains over the past few weeks. In addition to the flash flood threat with this storm, severe thunderstorms are also possible across western to central Tennessee, far eastern Arkansas, northern Mississippi, northern Alabama and northwest Georgia Tuesday into Tuesday night. By Wednesday, this storm will bring rains across the Mid-Atlantic into southern New England. At the moment, there is no threat of flash flooding or severe weather across these areas. An amplifying upper level trof will be pushing slowly southeastward across much of the west from the west coast into the Great Basin and Northern Rockies over the next 2 days This system will support a showery pattern across these regions with low elevation rains and higher elevation snows. Precipitation totals are expected to be only on the light to moderate side across much of the west. With this showery pattern, temperatures are expected to remain well below average into the middle part of this week along the west coast, into the Great Basin and Northern Rockies. In contrast to this, above average temperatures will stretch through the Plains and South on Tuesday, expanding eastward into much of the Mississippi Valley, Ohio Valley and Southern Mid-Atlantic on Wednesday. Wednesday will bring much cooler temperatures to the Northern Plains as a strong cold front presses southeastward across this region. An area of low pressure moving northeastward along this front will support accumulating snow potential Wednesday into early Thursday from the Northern Plains, across the Upper Mississippi Valley and into the Upper Great Lakes. Oravec Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php