Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 237 AM EST Wed Nov 11 2015 Valid 12Z Wed Nov 11 2015 - 12Z Fri Nov 13 2015 ...There is a slight risk of severe thunderstorms for parts of the Middle/Lower Mississippi Valley... ...Heavy rain possible over parts of the Upper Great Lakes to parts of the Middle Missouri Valley... ...Heavy rain possible over parts of the Olympic Peninsula... ...Snow possible over parts of the Northern Cascades/Northern Rockies and parts of the Central High Plains... A storm over the Central Plains will move northeastward to Southeastern Ontario by Thursday evening. The associated front will extend from the Central/Southern Plain and move eastward to the East Coast by Thursday. Moisture from the Gulf of Mexico will pool along the boundary aiding in the development of showers and thunderstorms from Central/Southern Plains and the Lower/Middle Mississippi Valley that will move eastward to the Central Gulf Coast to the Central Appalachians and northward into the Upper Great Lakes by Thursday morning. By Thursday evening, the moisture along the front will decrease and the showers and thunderstorms will end by Thursday afternoon. Rain will develop over parts of the Upper Midwest by Wednesday afternoon and expand eastward into the Great Lakes by late Wednesday night. The rain will move into the Northeast while extending westward to parts of the Upper Mississippi Valley by Thursday evening. Snow will develop on the northwest side of the precipitation shield over parts of the Central High Plains on Wednesday morning into afternoon. In addition, some wet snow may develop over parts of the Upper Mississippi Valley on Wednesday evening. Meanwhile, a front moving onshore over the Pacific Northwest will move eastward to the Northern Plains before becoming absorbed into the deep storm over the Great Lakes by Thursday. Rain will develop along the Pacific Northwest Coast and snow over parts of the Cascades and the Northern Rockies through Wednesday evening. Behind the system, weak onshore flow will aid in producing rain along the Northwest Coast and over parts of the Cascades through Thursday. Elsewhere, a deep low just off the Northeast Coast will move eastward out over the Western Atlantic by Wednesday evening. The storm will produce rain over parts of the Northeast that will slowly taper off by Wednesday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php