Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 329 AM EDT Fri May 22 2015 Valid 12Z Fri May 22 2015 - 12Z Sun May 24 2015 ...There is a slight risk of severe thunderstorms over parts of the Southern High Plains... ...Heavy rain possible over the Southern Plains into parts of the Central Plains... ...Temperatures will be 10 to 20 degrees below average over parts of the Central/Southern Plains... A quasi-stationary front along the Gulf Coast will begin to return northward over the Southern Plains on Saturday. The boundary will aid in focusing showers and thunderstorms over parts of the Central/Eastern Gulf Coast through Saturday. Moisture streaming northward over the Southern/Central Plains will aid in producing showers and thunderstorms over the Central/Southern Plains into parts of the Central High Plains on Friday and Saturday. Meanwhile, an upper-level low over Southern California will move northeastward to the Central Rockies by Saturday evening. The energy along with diurnal heating will trigger afternoon and evening showers and thunderstorms from parts of the Pacific Northwest/California eastward to the Central/Northern Rockies through Saturday. The areal coverage of the precipitation will wane during the late night and morning hours to rain with embedded thunderstorms on Friday and Saturday morning. Elsewhere, a reinforcing cold front extending from the Northern Appalachians to the Ohio Valley will move off the Northeast Coast while dissipating over parts of the Ohio Valley by Saturday morning. Scattered areas of rain will develop over parts of Northern New England and parts of the Central Appalachians on Friday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php