Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 PM EDT Wed Mar 11 2015 Valid 00Z Thu Mar 12 2015 - 00Z Sat Mar 14 2015 ...Heavy rain for the Lower Mississippi Valley... ...Temperatures will be 10 to 25 degrees above average over parts of the Central/Northern Plains... A front extending from the Carolinas to the Central Gulf Coast will move off the Southeast Coast over the Atlantic by Thursday morning. A wave of low pressure over the Western Gulf of Mexico will move northward to Arklatex area by Friday morning. The system will produce showers and thunderstorms along the Central Gulf Coast to the Southeast Coast through late Wednesday night. The showers and thunderstorms will end over the Southeast Coast on Thursday morning. As the wave of low pressure moves northward, moisture from the Gulf of Mexico will move northward from the Lower Mississippi Valley eastward to the Southeast Coast on Thursday into Friday. The moisture will overrun the associated boundary producing showers and thunderstorms over the Lower Mississippi Valley to the Eastern Gulf Coast by Thursday evening. Light to moderate rain will develop over parts of the Middle Mississippi Valley/Tennessee Valley and the Ohio Valley by Friday morning. Low pressure over the Northern High Plains will move eastward to the Upper Mississippi Valley by Friday. The system will develop light rain over parts of the Upper Great Lakes on Friday morning. Disorganized upper-level energy over the West Coast will move inland to the Rockies by Friday. The energy will produce rain over the Pacific Northwest Coast and Northern California Coast on Wednesday evening that will wane to parts of Western Washington state by Thursday morning before ending by Thursday evening. An area of rain will develop over parts of the Northern Intermountain Region into parts of the Great Basin that will move eastward into parts of the Rockies producing higher elevation snow and lower elevation rain on Thursday. The area of rain and snow will wane to parts of the Central/Southern Rockies by Friday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php