Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 315 AM EDT Thu May 28 2015 Valid 12Z Thu May 28 2015 - 12Z Sat May 30 2015 ...There is a slight risk of severe thunderstorms over parts of New England and the Central/Southern High Plains... ...Heavy rain possible over parts of the Southern Plains... A weak boundary extending from the Northern Appalachians to the Southern Ohio Valley then westward to the Central Plains will dissipate by Thursday evening. A second front over Southwest Canada will move southward to the Southern High Plains/Southern Rockies while moving eastward to the Upper Great Lakes to the Central Plains by Friday evening. Moisture from the Gulf of Mexico will extend northward to the Great Lakes by Friday. Showers and thunderstorms will develop over parts of the Southern Plains to the Eastern Gulf Coast and northward to the Upper Mississippi Valley and the Southern Ohio Valley through Thursday night. Showers and thunderstorms over the Northeast will move off the Northeast Coast by later Thursday evening. Another area of showers and thunderstorms will develop over parts of the Central Appalachian/Southern Mid-Atlantic by Thursday evening, likewise moving off the Mid-Atlantic Coast by later Thursday evening. Some of the showers and thunderstorms will remain over parts of the Central Appalachians to Friday morning before ending. Meanwhile, showers and thunderstorms will develop over parts of the Northern High Plains as the Canadian front moves southward by Thursday afternoon. These showers and thunderstorms will develop along and ahead of the boundary moving into the Northern Plains/Upper Mississippi Valley by Thursday evening. The showers and thunderstorms will move into the Upper Great Lakes and expand southward along the front into the Southern Plains/Middle Mississippi Valley by Friday evening. In addition, showers and thunderstorms will develop over parts of the Northern Rockies by Friday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php