Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 447 AM EDT Wed Apr 26 2017 Valid 12Z Wed Apr 26 2017 - 12Z Fri Apr 28 2017 ...There is a slight risk of severe thunderstorms over parts of the Lower/Middle Mississippi... ...There is an embedded moderate risk of severe thunderstorms over parts of Lower Mississippi Valley... ...Heavy snow for parts of the Northern/Central Rockies... ...Heavy rain possible from parts of Western Ohio Valley southwestward to the Lower Mississippi Valley... A front extending from the Upper Great Lakes/Upper Mississippi Valley southwestward to the Southern High Plains will move eastward to the Lower Great Lakes/Ohio Valley southward to Southeast/Tennessee Valley by Thursday evening. Showers and thunderstorms will develop along and ahead of the boundary from the Great Lakes to the Southern Plains/Western Gulf Coast that will advance slowly eastward to the Great Lakes/Ohio Valley to the Central/Southern Appalachians and parts of the Southeast by Thursday evening. Snow will also develop over parts of the Northern Plains and Upper Great Lakes/Upper Mississippi Valley through Thursday afternoon. In addition, rain/freezing rain will develop over parts of Northern Wisconsin and the Northwestern Upper Peninsula of Michigan through Thursday morning. Meanwhile, a front moving onshore over the Pacific Northwest will move southeastward to the Southern High Plains/Southern Plains and westward into the Southwest/Southern Rockies by Thursday evening. The storm will produce mainly rain over the Pacific Northwest and Northern California with snow and lower elevation rain over parts of the Northern Rockies. Overnight Wednesday, the snow levels will lower over the Pacific Northwest and into the Great Basin with snow developing over the Cascades and over parts of the Great Basin/Central Rockies. As the system moves eastward showers and thunderstorms will develop over parts of the Central/Southern Plains on Thursday into Thursday evening. Rain and higher elevation snow will continue over parts of the Pacific Northwest eastward to the Northern/Central Rockies through Thursday evening. Elsewhere, low pressure along the Northern Mid-Atlantic Coast will slowly move northward to New England Coast while weakening. The storm will produce rain along the Northern Mid-Atlantic Coast into the Northeast that will slowly wane to New England by Thursday morning and to New England Coast by Thursday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php