Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 437 AM EDT Sun May 01 2016 Valid 12Z Sun May 01 2016 - 12Z Tue May 03 2016 ...Heavy rain possible from parts of the Lower Mississippi Valley to the Central Appalachians... ...Snow over parts of the Central Rockies... A front extending from the Lower Great Lakes to the Western Gulf Coast will become quasi-stationary with the boundary inching to New England Coast and southwestward to the Lower Mississippi Valley by Monday evening. The system will develop showers and thunderstorms from the Ohio Valley to the Lower Mississippi Valley that will move to the Northern Mid-Atlantic Coast to the Lower Mississippi Valley/Western Gulf Coast by Monday evening. The showers and thunderstorms will also expand into parts of the Mid-Atlantic to parts of the Southeast on Sunday afternoon into evening continuing through to Monday. Rain will develop over parts of the Central Plains eastward to the Great Lakes and parts of the Northeast as well as parts of the Northern Mid-Atlantic on Sunday morning, too. The rain will come to an end over the Central Plains/Middle Mississippi Valley by Monday morning and over the Great Lakes by Monday evening. The rain will move into Northern New England by Sunday evening and continue over most of New England through Monday evening. Meanwhile, energy over the Southwest will slowly weaken and move eastward to the Great Lakes/Ohio Valley by Monday. The energy will produce rain and highest elevation snow over parts of the Central/Southern Rockies that will end overnight Sunday. Rain will also develop over parts of the Southern High Plains and move eastward to Oklahoma by Sunday evening, ending by Monday morning. In addition, moisture from the Gulf of Mexico will stream northwestward over the Western Gulf Coast into the Southern High Plains. Showers and thunderstorms will develop over parts of the Southern High Plains to the Western Gulf Coast on Sunday afternoon that will slowly move to the Western Gulf Coast by Monday evening. Additionally,upper-level energy over Southern California will move into parts of the Southwest by Monday evening. Diurnal heating and the upper-level energy will induce showers with embedded thunderstorms over parts of Central/Southern California eastward to parts of the Central/Southern Rockies on Monday afternoon and evening. Elsewhere, energy moving southward out of Central Canada will trigger areas of rain over parts of the Northern Plains on Monday morning that will expand into parts of the Middle Mississippi Valley and Central Plains by Monday evening. Furthermore, upper-level trough will begin to move onshore over the West Coast by Monday evening producing an area of rain over parts of the Pacific Northwest Coast and Northern California. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php