Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 401 PM EDT Thu Jun 11 2015 Valid 00Z Fri Jun 12 2015 - 00Z Sun Jun 14 2015 ...Severe thunderstorms and flash flooding possible from portions of the plains to the Great Lakes... ...Above average temperatures expected to continue for much of the western U.S. as well as the Mid-Atlantic and Northeast... A low pressure system across the central plains this afternoon will move eastward tonight and Friday, reaching the lower Great Lakes and Northeast by Friday evening. Showers and thunderstorms are expected across these regions in association with this system. Very moist and unstable air being transported northward into this system from the Gulf of Mexico will allow for the possibility of strong to severe thunderstorms as well as heavy rain and flash flooding across these areas. Refer to the Convective Outlook products issued by the Storm Prediction Center for further details on the severe weather threat. In the wake of this low pressure system, a trailing stationary frontal boundary will remain in place on Friday across the southern plains. This front as well as a dry line across Texas will both enhance the development of showers and thunderstorms across the southern and central plains through Saturday. Strong to severe thunderstorms and flash flooding will also be possible in these areas. Elsewhere, across the Gulf Coast and southeastern states, a moist and unstable air mass will result in daily scattered afternoon and evening showers and thunderstorms. High pressure at the mid and upper-levels will promote above average temperatures through Saturday across much of the western U.S., where afternoon high temperatures will be 5 to 15 degrees above average. The same will hold true from portions of the Ohio valley and Mid-Atlantic into the Northeast, where afternoon high temperatures will be 5 to 10 degrees above average. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php