Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 428 AM EDT Sun Oct 04 2015 Valid 12Z Sun Oct 04 2015 - 12Z Tue Oct 06 2015 ...Heavy rain and flash flooding likely for parts of the Southeast and the Southern Appalachians... ...Excessive rain and flash flooding possible for the Sierra-Nevada Mountains and Mojave Desert region Monday and Tuesday... Moisture streaming around the upper-level low and associated quasi-stationary surface boundary offshore the East Coast is expected to persist over the next couple of days. Rain coverage and intensity has significantly decreased over New England and northern Mid-Atlantic regions. However, widespread rain with embedded thunderstorms is forecast to continue for much of the southern portions of the Mid-Atlantic down to Georgia. South Carolina is forecast to have additional rain amounts up to 12 inches over the next 3 days. Flash flooding and river flooding have already been reported across that area. The threat for ongoing or additional flooding will remain very high through midweek. The upper-level energy over the Northern High Plains will slowly lift northeastward into Southern Canada by Monday morning. Precipitation is forecast across the Northern Rockies and High Plains through Monday. Another upper-level low will track toward southern California and will cause warm, moist air to stream in from the Gulf of California. This will prime the area for convective activity. Showers and thunderstorms will pop up over portions of the Desert Southwest, Great Basin and Central Rockies. Conditions will be favorable for heavy rain Monday and Tuesday for southern Nevada/California- primarily along the Sierra-Nevada range and the Mojave Desert. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php