Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 AM EDT Sun Jun 28 2015 Valid 12Z Sun Jun 28 2015 - 12Z Tue Jun 30 2015 ...Rainy day with a few thunderstorms expected today for the Northeast... ...Severe thunderstorms possible for portions of the middle Mississippi valley... ...Well above average temperatures to to continue for the northwestern U.S... An occluded low pressure system will bring widespread rain and a few thunderstorms to the northeastern U.S. today before rain begins to taper off from south to north tonight into Monday morning. A surface low pressure system will move across the Midwest today into tonight, bringing the possibility for showers and thunderstorms to portions of the Midwest, central plains, and Mississippi River valley. A more concentrated area of showers and thunderstorms is expected to develop along the surface warm front across portions of the upper Mississippi valley this morning then moving southeastward across the Midwest and into the Ohio valley tonight into Monday. The Storm Prediction Center is forecasting a slight risk of severe thunderstorms across much of the middle Mississippi valley extending west into eastern portions of Kansas. Please refer to the Convective Outlooks issued by the SPC for further information on the severe weather threat. A persistent ridge of high pressure at the mid and upper-levels of the atmosphere will remain in place across the western U.S. Temperatures will yet again be well above average, particularly across the Northwest, where afternoon high temperatures today will surpass 20 degree above average in many areas. A slight cooling trend is possible on Monday as the ridge retreats slightly, but temperatures will remain 10 to 15 degrees above average in many areas of the Northwest and Intermountain West. Moist flow from the Gulf of Mexico will be sufficient for isolated to scattered showers and thunderstorms during the afternoon and evening each day, primarily in areas of terrain. The majority of locations in the West will remain dry, however. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php