Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Sat Apr 25 2015 Valid 00Z Sun Apr 26 2015 - 00Z Tue Apr 28 2015 ...Severe thunderstorms possible for portions of the middle and lower Mississippi valley, Ohio valley, Gulf Coast, and Southeast... ...Rain and snow expected for much of the Intermountain West through Sunday... ...Below average temperatures with scattered precipitation will continue for the Northeast... A low pressure system will move from the middle Mississippi valley this afternoon into the Ohio valley tonight. Numerous showers and thunderstorms are expected in association with this system along and north of a warm front extending from the surface low eastward into the Carolinas. The Storm Prediction Center is forecasting a slight to enhanced risk of severe thunderstorms across portions of the Mid-Mississippi valley and Ohio valley in association with this system. Farther south, additional showers and thunderstorms will move across the Gulf Coast and southeastern states. There is a slight risk of severe thunderstorms in these areas as well. Please refer to the Convective Outlook products issued by the SPC for further details on the severe weather threat. Across the Mid-Atlantic states, cool and stable air in place will allow precipitation to fall as a light to moderate rain. Widespread precipitation associated with this system will begin to move offshore into the Atlantic Ocean on Sunday. A Pacific low pressure system will cross the Intermountain West tonight through Sunday, bringing a mix of rain and snow, which will be elevation dependent. Please refer to products issued by the Winter Weather Desk for further details on the winter weather threat. As this low pressure system moves into the southern plains Sunday night into early Monday, showers and thunderstorms are forecast to develop along and north of a cold front which will be moving southward across Texas. Across the Northeast, a slow-moving upper-level low will keep below average temperatures and moist conditions in place. High temperatures through Monday will be 5 to 10 degrees below average. Scattered showers will occur across northern New England on Sunday. By Sunday night into early Monday, snow may mix with scattered rain showers across the higher elevations of the Northeast. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php