Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 229 AM EDT Mon May 29 2017 Valid 12Z Mon May 29 2017 - 12Z Wed May 31 2017 ...Severe thunderstorms and locally heavy rain possible for portions of the Southeast and Gulf Coast states... ...Continued above average temperatures expected for the Interior Pacific Northwest and Great Basin... An upper-level trough across will persist across the Great Lakes through the next couple days. A series of cold fronts will affect areas from the plains and the Midwest to the East Coast, associated with multiple upper-level disturbances rotating around the system. A slow-moving to stationary frontal boundary will bring scattered to numerous showers and storms today and tonight from southern Texas along the Gulf Coast, and across the Southeast. Some thunderstorms could be severe, especially across the Southeast. Please refer to products issued by the Storm Prediction Center for further details on the severe weather threat. Locally heavy rain will also be possible. This front will linger into Tuesday, with scattered areas of showers and thunderstorms expected for much of the southern U.S. once again. Farther north, the northern portion of the same frontal boundary will bring widespread showers and a few thunderstorms to the Northeast today and tonight. On Tuesday, another frontal system will approach, bringing another potential round of showers and thunderstorms to the Northeast. By late Tuesday, yet another cold front will cross the central plains and mid-Mississippi valley, producing additional scattered showers and thunderstorms. High pressure aloft will begin to shift eastward from the West Coast into the Rockies through the next couple days. This will allow the above average temperatures to shift east as well. Temperatures are forecast to rise well into the 90s today and tomorrow for the interior Northwest, 10 to 20 degrees above average. Cooler Pacific air will begin to spread into coastal areas of the Northwest on Tuesday as the ridge of high pressure begins to shift east. By Wednesday, the center of above average temperatures will shift to the northern Rockies, while the Northwest will see a bit of a respite from the hot temperatures as a Pacific frontal system approaches. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php