Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 341 AM EDT Wed Jul 01 2015 Valid 12Z Wed Jul 01 2015 - 12Z Fri Jul 03 2015 ...Severe thunderstorms and flash flooding possible for portions of the middle Mississippi valley, Tennessee valley, and Southeast... ...Showers and thunderstorms expected for New England... ...Temperatures to remain well above average the Northwestern U.S... A surface low will move eastward along a frontal boundary across the central plains today. Showers and thunderstorms are possible today along and ahead of this front across areas from the central and northern plains to the Ohio and Tennessee valleys into portions of the Southeast. The Storm Prediction Center is forecasting a slight risk of severe thunderstorms through tonight across portions of the middle Mississippi valley, Tennessee valley, and the Southeast. Please refer to products issued by the SPC for further details on the severe weather threat. Heavy rain and flash flooding are also possible across many of the same areas. Additional showers and thunderstorms are possible along an inverted trough extending from the surface low northward into the northern plains. This frontal boundary will become nearly stationary by Thursday morning, allowing showers and thunderstorms to affect some of the same areas again on Thursday. Thursday night into Friday, the front should begin to move southward once again as a stronger upper-level trough dives southeastward into the central U.S. from Canada. A deepening surface low will move northeastward across Quebec today as the associated cold front sweeps eastward across the Northeast and the Mid-Atlantic states. Showers and thunderstorms are expected across the Northeast today in association with this system. Shower and thunderstorms activity should be the most widespread along and north of a warm front which will move northward across New England today. The cold front will move east of Maine by Thursday morning, bringing an end to precipitation chances for the Northeast. Across the West, a mid/upper-level ridge of high pressure will remain firmly entrenched through the short range. Afternoon high temperatures across the Northwest will continue to be 10 to 20 degrees above average through the next couple days. Scattered afternoon and evening showers and thunderstorms will be possible, primarily across portions of the Southwest and the Rockies. Showers and thunderstorms will be the most concentrated in areas of terrain. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php