Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 422 PM EDT Mon Oct 23 2017 Valid 00Z Tue Oct 24 2017 - 00Z Thu Oct 26 2017 ...There is a slight risk of severe thunderstorms over parts of the Southern Mid-Atlantic... ...Heavy rain possible over parts of New England... ...Heavy rain possible over parts of the Upper Great Lakes... A deep upper-level trough over the Middle/Upper Mississippi Valley will deepen and the trough axis will move to the Great Lakes to the Eastern Gulf Coast by Wednesday. Rain will develop over the Great Lakes/Ohio Valley through Wednesday morning. Wet snow will also develop over parts of the northwestern portion of the upper peninsula of Michigan Tuesday afternoon into late Tuesday evening. Rain will also develop over parts of the Lower Great Lakes into the Central Appalachians that will move slowly move into parts of Northern New England by Wednesday morning. Showers and thunderstorms will develop along and ahead of the associated front from parts of the Mid-Atlantic/Southern Appalachians into the Southeast that will move northeastward into Southern New England and to the Mid-Atlantic Coast by Tuesday morning. The showers and thunderstorms will move off most of the Southeast Coast by Tuesday morning, too. Similarly, the showers and thunderstorms will move off the Mid-Atlantic Coast overnight Tuesday, while lingering over parts of Southern New England through Wednesday morning. In addition, upper-level energy will move into parts of the Upper Mississippi Valley/Upper Great Lakes overnight Tuesday into Wednesday. Likewise, light rain will develop overnight Tuesday over parts of the Upper Great Lakes/Upper Mississippi Valley into Wednesday. Elsewhere, onshore flow will return to parts of the Pacific Northwest overnight Tuesday producing light rain over parts of the Northwest on Wednesday. Furthermore, strong high pressure over the Rockies will aid in producing Santa Anna wind over parts of Southwestern California through Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php