Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 427 AM EDT Tue Apr 25 2017 Valid 12Z Tue Apr 25 2017 - 12Z Thu Apr 27 2017 ...There is a slight risk of severe thunderstorms over parts of the Middle Mississippi Valley and Central/Southern Plains... ...Heavy rain possible over parts of New England Coast... ...Heavy rain possible over parts of the Upper Great Lakes and Middle Mississippi Valley... ...Heavy rain possible over parts of the Pacific Northwest/Northern California... Low pressure over the Carolinas will move northward to just south of Long Island New York by Wednesday. The system will produce showers and thunderstorms over parts of the Southern Mid-Atlantic that will move to coastal Southern New England by Wednesday morning and off the New England Coast by Wednesday evening. The storm will also produce rain over parts of the Northern Mid-Atlantic into parts of the Lower Great Lakes and Southern New England on Tuesday morning that will expand northward into Northern New England by Tuesday evening. The rain will end over the Lower Great Lakes by Wednesday morning and over the Northern Mid-Atlantic by Wednesday evening, while hanging on over the New England Coast by Wednesday evening. Meanwhile, a front extending from the Upper Great Lakes/Upper Mississippi Valley southwestward to the Southern High Plains and into the Southwest will move into the Upper Great Lakes southward to the Lower Mississippi Valley/Western Gulf Coast by Wednesday evening. The system will produce rain and snow over parts of the Upper Great Lakes/Upper Mississippi Valley through Tuesday evening. Overnight Tuesday, rain and snow will return to the Upper Mississippi Valley through Wednesday evening. In addition, some areas of rain/freezing rain will develop over parts of the Arrowhead of Minnesota and the western portion of the upper peninsula of Michigan on Wednesday into Wednesday evening. The storms upper-level energy will aid in producing rain and higher elevation snow over the Northern/Central Rockies and the Great Basin through Wednesday morning. Rain and higher elevation snow will develop over parts of the Southern Rockies on Tuesday afternoon into Wednesday morning. Furthermore, showers and thunderstorms will develop over parts of the Central Plains that will expand into the Middle Mississippi Valley by Tuesday evening. Overnight Tuesday, showers and thunderstorms will develop along and ahead of the associated front from parts of the Great Lakes/Western Ohio Valley southwestward to Southern Plains that will move eastward into the Middle/Lower Mississippi Valley by Wednesday evening. In the meantime, upper-level energy will move onshore over the Pacific Northwest on Tuesday afternoon that will move inland to the Great Basin/Northern Rockies by Wednesday evening. Rain will develop over parts the Pacific Northwest and Northern California by Tuesday evening. Overnight Tuesday, the precipitation will move inland to the parts of the Great Basin/Northern Rockies. Snow will develop over parts of the Cascades and the Northern Rockies by Wednesday morning. By Wednesday evening, rain and higher elevation snow will move into parts of the Central Rockies. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php