Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 314 AM EST Thu Dec 31 2020 Valid 12Z Thu Dec 31 2020 - 12Z Sat Jan 02 2021 ...There is an Enhanced Risk of server thunderstorms over parts of the Lower Mississippi Valley/Central Gulf Coast... ...There is a Slight Risk of excessive rainfall over parts of the Southern Plains/Lower Mississippi Valley... ...Rain/freezing rain possible in an arc from the Southern Plains to the Northeast... ...Heavy snow for Western Texas... A front extending from the Northeast southwestward to the Western Gulf Coast will move off the Northeast/Northern Mid-Atlantic Coast by Thursday evening. Rain and snow will develop along and near the boundary over the Northeast, which will move off the Northeast Coast by Thursday evening. Areas of rain will develop over parts of the Central Appalachians/Southern Mid-Atlantic to the Southeast and Lower Mississippi Valley on Thursday. Showers and thunderstorms will develop over parts of the Western Gulf Coast that will move into the Lower Mississippi Valley/Central Gulf Coast overnight Thursday. The SPC has issued an Enhanced Risk of server thunderstorms over parts of the Lower Mississippi Valley/Central Gulf Coast on Thursday into New Yearâ€s Day. The Severe thunderstorms will have the threat of frequent lightning, damaging severe thunderstorm wind gust, hail, and tornadoes. Heavy rain will develop with the rain and thunderstorms over parts of the Southern Plains/Lower Mississippi Valley on Thursday into New Yearâ€s Day. The WPC has issued a Slight Risk of excessive rainfall over parts of the Southern Plains/Lower Mississippi Valley through New Yearâ€s Day morning. The heavy rain will develop areas of scattered flash flooding. Most of the flash flooding will be mainly localized. The areas with the most significant threat will be urban areas, roads, and small streams. On Thursday afternoon, a wave of low pressure over the Western Gulf Coast will intensify and move to the Northeast by Saturday morning. Additionally, snow will develop over Western Texas on Thursday, too. The snow will end over the Southern Plains on New Yearâ€s Day morning. On Friday into Saturday morning, the showers and thunderstorms will move from Central Gulf Coast to the Southeast. Overnight Thursday, an area of rain/freezing rain will develop over parts of the Southern Plains into parts of the Middle Mississippi Valley. The rain/freezing rain area will move northward into the Western Ohio Valley then move into parts of the Lower Great Lakes/Northern Mid-Atlantic by Friday evening. By Saturday morning, pockets of rain/freezing rain will extend from Southern Michigan to parts of New England. Meanwhile, rain moves into parts of the Ohio Valley/Central Appalachians by Friday morning. The rain continues over the Mid-Atlantic into Saturday morning. In the meantime, multiple systems will move into the Northwest, moving to the Northern High Plains by Saturday. The systems will produce rain and higher elevation snow over the Pacific Northwest into Northern/Central California and snow developing over parts of the Northern Intermountain Region and the Great Basin on Thursday morning. The rain and snow will wane over parts of the Northwest by Thursday evening, returning by Friday evening, continuing into Saturday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php