Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 316 PM EDT Thu Aug 13 2015 Valid 00Z Fri Aug 14 2015 - 00Z Sun Aug 16 2015 ...Severe thunderstorms possible across portions of Nebraska... ...Cooler temperatures and precipitation expected across the Northwest... A cold front will move across the Upper Great Lakes tonight -- scattered showers and thunderstorms are possible in association with the front. South of the front, a weak boundary/trough will also result in the development of scattered showers and thunderstorms this evening into tonight across the central/northern plains. Abundant instability and sufficient vertical wind shear will result in the possibility of some severe thunderstorms, and the Storm Prediction Center has outlined a slight risk of severe thunderstorms across portions of Nebraska. Scattered showers and thunderstorms will continue across the Midwest and Great Lakes on Friday south of the cold front, which will move across the northern Great Lakes. A weakening stationary frontal boundary extending from the Gulf Coast across northern Florida and into the Atlantic Ocean will result in scattered showers and thunderstorms. Enhancement resulting from the sea breeze may result more widespread showers and thunderstorms across the Florida Peninsula early this evening and again Friday afternoon and evening. High pressure at the mid and upper-levels will keep above average temperatures in place from the northern Intermountain West into the Upper Midwest over the next couple days, with afternoon high temperatures 10 to 15 degrees above average. The Pacific Northwest will see a reprieve from the warm temperatures as a cold front is expected to move onshore late today -- which will then move across the northern Intermountain States by Friday afternoon. Behind the front, cooler temperatures will be accompanied by showers and thunderstorms -- which will be the most widespread across the Cascades Friday afternoon and evening. Additional isolated to scattered showers and thunderstorms will be possible across much of the Intermountain West, especially in areas of higher terrain. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php