Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 228 PM EDT Tue Oct 14 2014 Valid 00Z Wed Oct 15 2014 - 00Z Fri Oct 17 2014 ...Some additional focus for severe weather is expected through this evening from the Southeast to the Southern Mid-Atlantic... ...Heavy rainfall and some potential for flash flooding exists from portions of the Southeast and Mid-Atlantic up into the Central Appalachians through tonight... ...Pacific moisture and much needed rain to arrive across the Northwest through midweek... A deep storm system over the eastern third of the country will slowly lift northeastward and is expected to gradually drive a cold front offshore most of the East Coast by Thursday. A significant amount of moisture pooling along and ahead of the front coupled with larger scale forcing and dynamics associated with the storm system should foster a fairly widespread threat for additional severe weather this afternoon and evening across much of the Southeast and up into portions of the southern Mid-Atlantic. However, another weather hazard of concern will be the very heavy rainfall that will be accompanying the cold front as it moves from the Ohio and Tennessee Valleys east across the Central and Southern Appalachians and into the Mid-Atlantic and Southeast coastal plains by tomorrow. Sufficiently heavy enough rain is expected to produce some concern for flash flooding at least locally and especially over the east facing slopes of the Central and Southern Appalachians along with the adjacent foothills. The heavier rains with the cold front should shift into the Northeast by Thursday, but an organized threat for flooding over the Northeast is not expected at this time. Meanwhile, a cold front associated with an upper trough will be moving through the Northwest U.S. and gradually the Northern and Central Rockies by Friday. The front will be accompanied by an influx of Pacific moisture which will focus numerous showers and some much needed rain for the Pacific Northwest and as far south as Northern California. In the wake of this cold front, drier air will follow, and some of the moisture that does advance into the West will be moving out across the Northern High Plains as low pressure develops east of the Rockies Thursday. Orrison Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php