Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Sun Oct 13 2013 Valid 12Z Sun Oct 13 2013 - 12Z Tue Oct 15 2013 ...Heavy rain possible over parts of the Upper Mississippi Valley/Northern Plains... ...Heavy rain possible over parts of the Southern Plains... A front extending from the Great Lakes southwestward to the Lower Mississippi Valley/Southern Plains will move eastward to the Northeast/Mid-Atlantic by Monday evening. Showers and thunderstorms will develop along the front over the Great Lakes that will transition to rain by Sunday afternoon over the Lower Great Lakes/Central Appalachians that will dissipate over the Northeast by Monday evening. Meanwhile, a developing storm over the Great Basin/Central Rockies will advance eastward to the Central Plains by Monday evening. The storm will initially produce a small area of rain and higher elevation snow over parts of the Northern Rockie/Great Basin that will expand north and southward over the region by Sunday evening. The system will draw moisture northward over the Southern Plains from the Western Gulf of Mexico into the Northern High Plains/Northern Plains on Sunday into Monday. The moisture will aid in the development of showers and thunderstorms over the Southern High Plains/Southern Plains on Sunday. As the moisture advances northward, light to moderate rain will develop over part of the Northern High Plains Sunday night expanding eastward into the Upper Midwest by Monday evening. Snow will also develop over parts of the Northern/Central Rockies, as showers and thunderstorms, with moderate rain, develops over parts to the Central/Southern Plains on Monday. Elsewhere, easterly flow off the Atlantic associated with high pressure over the Gulf of Maine and a weakening area of low pressure off the Carolina Coast will produce light rain and drizzle over parts of the Mid-Atlantic on Sunday. While showers and thunderstorms will develop along portions of the Southeast Coast on Monday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php