Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 PM EDT Sun Sep 09 2018 Valid 00Z Mon Sep 10 2018 - 00Z Wed Sep 12 2018 ...Heavy rain and flooding to continue for parts of the upper Ohio Valley into Pennsylvania and New York through Monday... ...Heavy rain possible over parts of the western Gulf coast states... ...Cool and wet conditions for the Pacific Northwest into the middle of the week... Cool and wet conditions will remain for the upper Ohio Valley into the northern Mid-Atlantic and portions of the Northeast over the next 24 to 36 hours where flood watches and warnings are in effect. These locations are north of a quasi-stationary front that extended east-west across the Mid-Atlantic coast as of Sunday afternoon, separating cool/wet conditions from more summer-like heat and humidity across the southeastern U.S. To the north, cool east-northeasterly flow at the surface will be overrun by a moist southerly fetch of winds in the lower levels of the atmosphere, located out ahead of a cold front stretching from the upper Ohio Valley to the western Gulf coast. An additional 2-4 inches of rain is expected from the Ohio/Pennsylvania border into northern Pennsylvania and central New York through Monday, leading to flooding for a few of these locations. Scattered thunderstorms will be found near and ahead of the cold front which extends southward from the Ohio Valley to the western Gulf coast region, diurnally enhanced in coverage during the afternoon and evening hours. The southern portion of the front is expected to remain in about the same location through Tuesday, which is expected to promote locally heavy rainfall totals from southern and eastern Texas into the central Gulf coast. Given deep moisture in place near the front, localized flash flooding will be possible for locations near the Texas and Louisiana coasts through Wednesday morning. Across the northwestern U.S., a large closed upper level low will remain near the Pacific Northwest coast bringing cooler than average temperatures to the interior Northwest. High temperatures are forecast to be generally 5-15 degrees below mid-September averages through the middle of the week. In addition, steady light to occasionally moderate rainfall will begin to impact western Washington into northwest Oregon later this evening with increasing cloud cover for interior locations. Otto Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php