Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 355 AM EDT Mon Oct 07 2013 Valid 12Z Mon Oct 07 2013 - 12Z Wed Oct 09 2013 ...There is a slight risk of severe thunderstorms from parts of the Northern Appalachians to the Northern Mid-Atlantic... ...Heavy rain possible over parts of the Southeast Coast... A strong front extending from the Lower Great Lakes southward to the Eastern Gulf Coast will move off most of the Eastern Seaboard by late Monday night. A wave of low pressure over the Eastern Gulf Coast will slowly track northeastward to off the Southeast Coast by Tuesday evening. Showers and thunderstorms will develop along and ahead of the boundary from the Southeast/Eastern Gulf Coasts to the Mid-Atlantic/Southern New England on Monday. Moderate to heavy rain will also develop along the front over parts of the Northern Appalachian/Lower Great Lakes, moving northeastward into Northern New England Monday evening. The precipitation will come to an end over the Northeast/Northern Mid-Atlantic on Tuesday morning. The system will produce light to moderate rain over the Upper Great Lakes on Monday morning, ending by Monday afternoon. The wave of low pressure over the Southeast will stream moisture into the Southeast Coast producing rain and showers/thunderstorms over the Southern Mid-Atlantic to the Southeast on Tuesday. A second front over the interior Pacific Northwest will move eastward to the Northern Plains by Tuesday evening. The front will be dry once east of the Rockies. Onshore flow off the Pacific will produce rain over parts of the Pacific Northwest eastward to the Northern Rockies through Tuesday. Overnight Monday into Tuesday morning, some snow will develop at the higher elevations of the Washington State Cascades and the Northern Rockies. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php