Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 417 AM EDT Mon Apr 25 2016 Valid 12Z Mon Apr 25 2016 - 12Z Wed Apr 27 2016 ...There is a slight risk of severe thunderstorms over parts of the Upper Great Lakes into the Middle Mississippi Valley... ....Heavy rain possible over parts of the Central Plains/Middle Mississippi Valley... ...Heavy rain possible over Eastern Texas... ...Heavy precipitation over parts of Eastern Wyoming... Weakening low pressure over Upper Midwest and associated front will merge with the storm coming out of the Great Basin by Tuesday morning. The system will produce showers and thunderstorms over parts of the Great Lakes/Upper Mississippi Valley into parts of the Middle Mississippi Valley that will expand into parts of the Lower Great Lakes/Ohio Valley by Monday evening. Rain will also develop over parts of the Northern High Plains/Northern Plains on Monday morning continuing through Monday night. In addition, showers and thunderstorms will develop over parts of the Western Gulf Coast/Lower Mississippi Valley and parts of the Eastern Gulf Coast into the Southern Appalachians on Monday afternoon into evening. Additionally, the showers and thunderstorms will move into parts of the Northern Mid-Atlantic by Tuesday morning that will extend from the Mid-Atlantic westward to the Western Ohio Valley/Middle Mississippi Valley by Tuesday evening. Rain will also develop over parts of the Upper Great Lakes into New England overnight Monday ending over the Upper Great Lakes by Tuesday afternoon. Meanwhile, a developing upper-level low over the Great Basin will move eastward to the Central Rockies by Tuesday evening. The storm will produce rain and highest elevation snow over parts of the Pacific Northwest to the Northern/Central Rockies to parts of Southern/Central California to the Great Basin on Monday morning, expanding into parts of the Southwest and Southern Rockies by Monday evening. The rain and highest elevation snow will continue over parts of the Northern/Central Rockies and parts of the Great Basin into parts of the Southern Rockies through Tuesday evening. Showers and thunderstorms will develop over parts of the Central High Plains overnight Monday expanding into parts of the Central/Southern Plains by Tuesday morning continuing through Tuesday evening. Furthermore, rain will develop over parts of the Northern High Plains/Northern Plains on Tuesday morning likewise continuing into Tuesday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php