Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 334 PM EST Sat Jan 21 2017 Valid 00Z Sun Jan 22 2017 - 00Z Tue Jan 24 2017 ...There is a slight risk of severe thunderstorms with and embedded region of moderate risk over the Lower Mississippi Valley to the Southeast... ...Heavy rain possible a long the West Coast... ...Heavy snow for the Sierras... ...Heavy rain over the Southern Appalachians... A storm over the Southern Plains will move northeastward to the Central Appalachians by Monday. The system will produce showers and thunderstorms from the Southern Mid-Atlantic/Southeast to the Central Gulf Coast and Southern Plains that will move off the Southeast/Southern Mid-Atlantic Coast overnight Sunday. In addition, overnight Saturday an area of rain will develop over Oklahoma that will expand into the Middle/Lower Mississippi Valley and the Tennessee Valley/parts of the Southeast by Sunday evening. The rain will move into the Ohio Valley/Tennessee Valley to parts of the Mid-Atlantic by Monday. Additionally, snow will begin to develop over parts of New England on Monday into Monday evening. Meanwhile, a developing deep upper-level low over the Eastern Pacific will move to the West Coast by Monday. A plume of moisture will stream into Southern California overnight Saturday into Sunday that will begin to wane by Monday. The system will produce coastal rain and higher elevation snow over the Pacific Northwest to Central California by Saturday evening. Snow and lower elevation rain will develop over parts of the Central/Southern Rockies and parts of the Great Basin that will end by Sunday morning. In the meantime, rain and higher elevation snow will move into Southern California with snow moving into the Northern Rockies/Great Basin by Sunday evening. The snow and coastal rain will begin to wane over parts of the Pacific Northwest by Monday morning. Rain and snow will be heavy at times over Central/Southern California through Monday morning, too. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php