Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 353 PM EDT Mon Mar 20 2017 Valid 00Z Tue Mar 21 2017 - 00Z Thu Mar 23 2017 ...Heavy snow possible over the Sierras... ...Heavy rain over parts of Northern California... ...Snow over parts of the Northern/Central Plains... Low pressure over the Ohio Valley will move eastward off the Mid-Atlantic Coast by Tuesday afternoon. The associated front will southward to the interior Gulf Coast States and eastward off the Southern Mid-Atlantic Coast by Wednesday morning. The system will produce showers and thunderstorms over parts of the Ohio Valley/Central Appalachians that will move to parts of the Mid-Atlantic/Tennessee Valley that will end over the Mid-Atlantic by Tuesday afternoon. On Tuesday, moisture will pool along the boundary from parts of the Southern Plains to the Southeast. Also on Tuesday afternoon, showers and thunderstorms will expand along the front over the Tennessee Valley into the Middle Mississippi Valley that will expand into parts of the Southeast by Tuesday evening. Overnight Tuesday, the showers and thunderstorms will expand into parts of the Southern Plains. Meanwhile, upper-level energy over the Northern Intermountain Region/Northern Rockies will move eastward and dissipate over the Ohio Valley by Tuesday evening. The energy will develop snow and rain over parts of Northern Intermountain Region/Northern Rockies into parts of the Northern/Central High Plains that will move eastward into parts of the Northern/Central Plains and Middle Mississippi Valley that will end by Tuesday evening. A second area of upper-level energy will move out of the Northern Rockies into the Central Plains Tuesday into Wednesday morning. The energy will produce rain and some snow over parts of the Central Rockies/Central High Plains that will move into parts of the Central/Northern Plains by Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php