Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 1219 PM EST Sat Feb 24 2018 Valid 00Z Sun Feb 25 2018 - 00Z Tue Feb 27 2018 ...Flash Flooding is likely from the southern Plains into the Ohio Valley today and tonight... ...Enhanced risk of severe thunderstorms/tornadoes over parts of the Lower Mississippi and Lower Ohio Valleys... ...Heavy snow over the Cascades and Northern Rockies... ...Heavy snow for Upper Mississippi Valley/Upper Great Lakes... Cold air aloft associated with an upper level disturbances and onshore flow will lead to a wet regime across the Northwest, with coastal rain and higher elevation snow through Sunday night associated with a pair of frontal zones at the trough's leading edge. Northern California and the Central Rockies will be greeted by lower elevation rain/higher elevation and interior snow intermittently into Monday. A wave of low pressure over the Southern Plains will deepen rapidly and occlude while moving through the Great Lakes Sunday morning. The system will produce snow -- heavy at times -- to the left of its track over parts of the Northern Plains, the Upper Midwest, and Upper Peninsula of Michigan by Saturday night, clearing the Great Lakes by Sunday evening. Closer to its cold and warm fronts, showers and thunderstorms with a high risk of flash flooding over parts of the Lower/Middle Mississippi Valley into parts of the Ohio Valley by Saturday evening. Per the Storm Prediction Center, some thunderstorms in may be severe (including tornadoes) today and tonight across portions of the Mississippi Valley, Ohio Valley, and Tennessee. Showers and thunderstorms linger across the Western/Central Gulf Coast into Sunday night as the cold front stalls and weak waves ripple along the boundary. Precipitation then moves eastward into a more stable airmass as an area of rain into the Southern Mid-Atlantic/Southeast Sunday afternoon and evening and the Northeast on Sunday. Snow is expected across Northern New England. Areas of freezing rain are also possible in New England. Roth Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php