Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 PM EDT Sat May 21 2016 Valid 00Z Sun May 22 2016 - 00Z Tue May 24 2016 ...A wet and cool weekend will continue for much of the Western U.S. as well as portions of the Mid-Atlantic states... ...Heavy rains and severe storms will be possible ahead of a frontal boundary slowly edging out into the Great Plains... Widespread shower activity will continue beneath a broad upper trough carving out over the Western U.S. this weekend and into early next week...especially during the late afternoon and early evening hours. In addition...the expansive upper trough should keep daytime temperatures well below normal from the West Coast to the Rockies. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php