Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 413 AM EDT Sun Mar 18 2018 Valid 12Z Sun Mar 18 2018 - 12Z Tue Mar 20 2018 ...There is a slight to enhanced risk of severe thunderstorms over parts of the Central Appalachians/Southern Mid-Atlantic Monday and Tuesday... ...There is a slight risk for severe thunderstorms for portions of the Southern Plains and Gulf states on Sunday... ...Heavy snow possible over parts of the Northern Intermountain Region and Central Rockies... Showers and thunderstorms will develop across much of the Southern Plains and Gulf states today as warm Gulf moisture transports northward over a stalled front. Some of the storms may become strong to severe - the Storm Prediction Center has identified much of the Southern Plains and Lower Mississippi Valley as having a slight risk for severe thunderstorms today. The area of strong convection will expand into parts of the Southeast/Southern Mid-Atlantic by Monday morning as the surface front crosses the central U.S. and lifts through the Southern Appalachians/Mid-Atlantic regions and offshore by Tuesday. As a result, the area of slight and enhanced risk for severe thunderstorms will shift as well - covering much of the Southern/Central Appalachians and the surrounding area. Additionally, snow will be possible for parts of the Ohio Valley, northern Mid-Atlantic and southern portions of the Northeast by late Monday into Tuesday. In the meantime, upper-level energy moving around a deep upper-level trough over Central California will move eastward to the Lower/Middle Mississippi Valley and the Southern Plains by Monday. Rain and higher elevations snow will continue over the Pacific Northwest Coast through Monday morning, as well as, parts of the Northern Rockies. Snow will expand east out of the Southwest and the Central/Southern Rockies into the Northern/Central High Plains by Sunday evening. Snow will be heavy at times for portions of the Central and Northern Rockies over the next couple of days. Winter Weather Advisories are in effect across portions of the Intermountain West and the Four Corners region. The West Coast will be transitioning back to a prolonged wet period by the middle of week. Portions of California will likely see long duration of rain that could lead to significant impacts, including debris flows, mudslides and flooding. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php