Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 PM EDT Mon Apr 11 2016 Valid 00Z Tue Apr 12 2016 - 00Z Thu Apr 14 2016 ...There is a slight risk of severe thunderstorms over the Southern Mississippi Valley into the Southern Plains... ...Heavy rain possible across the Western Gulf Coast/Lower Mississippi Valley and Tennessee Valley... ...Temperatures will be 10 to 20 degrees below average over the Southern Rockies and Southern High Plains... A front extending from the Lower Great Lakes to Southern Plains then is banked up against the Rockies will move eastward off the East Coast by Wednesday morning with a quasi-stationary front lingering across the Gulf Coast. Showers and thunderstorms will develop along and ahead of the boundary from the Southern Ohio Valley to the Lower Mississippi Valley/Southern Plains on Monday evening that will move to the Southeast by Tuesday afternoon and extending westward to the Southern Plains/Western Gulf Coast. The showers and thunderstorms will linger over the Southeast to the Western Gulf Coast through Wednesday morning. In addition, rain will develop along the front from the Northeast to the Ohio Valley on Monday evening, too. The rain will move off the Northeast and Mid-Atlantic Coast by Tuesday night. Upper-level energy over the Great Lakes will aid in triggering light snow over parts of the Upper Great Lakes through Tuesday afternoon. The light snow will develop over the Lower Great Lakes on Tuesday afternoon into Tuesday evening. Meanwhile, an upper-level low over Southern California/Northern Mexico will move eastward to the Southern Plains by Wednesday morning. The system will produce rain with embedded thunderstorms from California to the Central/Southern Rockies on Monday evening that will wane overnight to an area over parts of the Southwest/Southern Rockies by Tuesday morning. The showers and thunderstorms will expand again by Tuesday evening to extend from the Great Basin/Southwest to the Central/Southern Rockies, waning overnight Tuesday. Additionally, a weak front will move onshore over the Pacific Northwest by Tuesday afternoon moving to the Northern High Plains by Wednesday morning. The system will produce rain over parts of the Pacific Northwest and expand inland to the Northern/Central Rockies by Tuesday evening. The rain will continue over the region through Wednesday morning. Energy moving onto the Northern Plains by Tuesday evening will trigger rain and snow over parts of the Northern Plains/Upper Mississippi Valley by Tuesday evening Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php