Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 440 PM EDT Thu Oct 20 2016 Valid 00Z Fri Oct 21 2016 - 00Z Sun Oct 23 2016 ...There is a slight risk of severe thunderstorms over parts of the Lower Great Lakes and Central Appalachians... ...Heavy rain possible over parts of the Northern/Central Appalachians and the Lower Great Lakes... Low pressure over the Lower Great Lakes/Ohio Valley will deep significantly while moving eastward to Cape Cod by Saturday. Showers and thunderstorms will develop along and ahead of the associated boundary from parts of the Northern Appalachians/Lower Great Lakes to Lower Mississippi Valley/Western Gulf Coast that will move eastward to the Northern/Central Appalachians and parts of the Eastern/Central Gulf Coast, while ending over parts of the Southwest by Friday morning. The showers and thunderstorms will be limited to parts of New England by Friday evening into Saturday morning. Rain will dominate the precipitation from parts of the Southern Appalachians/Eastern Ohio Valley to the Northeast on Friday. The rain will move into parts of the Mid-Atlantic by Friday evening. The rain will continue from parts of the Northeast to the Mid-Atlantic/Central Appalachians through Saturday. In addition, wet snow will develop over parts of the higher elevations of Western and interior New York on Saturday morning. With snow developing over the higher elevations of the Northern Appalachians of New York by Saturday evening. Meanwhile, a front moving onshore over the Pacific Northwest will move inland to the Northern Rockies/Intermountain Region and Northern Plains by Saturday. Rain will develop from parts of the Northern Rockies to the Pacific Northwest that will move into parts of the Northern Plains by Friday morning. The rain will end over the Northern Plains by late Friday afternoon. Rain will continue over parts of the Pacific Northwest through Saturday. Overnight Friday, rain will surge into parts of the Northern Rockies/Northern Plains. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php