Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 438 PM EDT Fri May 12 2017 Valid 00Z Sat May 13 2017 - 00Z Mon May 15 2017 ...There is a slight risk of severe thunderstorms over parts of the Central Gulf Coast... ...Heavy rain possible over parts of the Northern Mid-Atlantic Coast and New England Coast... A front extending from the Southeast Coast to the Lower Mississippi Valley will develop a deepening wave of low pressure over the Southeast that will move off the Southern Mid-Atlantic Coast on Saturday. The low will deepen off the Northern Mid-Atlantic Coast and move northward to just south of the New England Coast by Sunday. Showers and thunderstorms will develop from the Southern Mid-Atlantic Coast to the Lower Mississippi Valley that will move to the Southeast Coast by Saturday afternoon and off the coast by early Sunday morning. Rain will also develop over parts of the Northern Mid-Atlantic/Central Appalachians that will expand into parts of the Northeast and off the Mid-Atlantic Coast overnight Saturday. The rain will continue over New England on Sunday. In addition, upper-level energy over Western Ontario and the Upper Great Lakes will move southeastward to the Northern Mid-Atlantic/Northeast by Sunday. The energy will trigger rain showers over parts of the Great Lakes through Sunday. Meanwhile, an upper-level low over the Pacific Northwest/Northern California will slowly weaken while parts of the energy moves to the Northern High Plains by Sunday. The system will produce rain with embedded daytime thunderstorms over parts of the Pacific Northwest eastward to the Northern Rockies/Northern High Plains and higher elevation snow that will continue through to Sunday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php