Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 PM EDT Tue May 30 2017 Valid 00Z Wed May 31 2017 - 00Z Fri Jun 02 2017 ...Severe thunderstorms and locally heavy rain possible today for portions of the northern Mid-Atlantic and Northeast... ...Above average temperatures expected to shift east from the Pacific Northwest to the northern Rockies... Scattered to numerous showers and thunderstorms will develop along and ahead of a front moving through the Northeast and northern Mid-Atlantic today and tonight. Conditions will be favorable for some of the storms to become severe across this region with embedded heavy rain as well. Please refer to products issued by the Storm Prediction Center for further details on the severe weather threat. A secondary cold front is forecast to pass through the Great lakes and Ohio Valley on Wednesday bringing another round of scattered showers and thunderstorms. High pressure will begin to build in the wake of this system; which will usher in a slightly cooler and drier airmass. The southern flank of this frontal boundary will stall across the southern-tier states and will be the focus for generating showers and thunderstorms through Thursday afternoon. Much of the Pacific Northwest will be cool over the next few days as an upper-level trough approaches and the ridge continues to shift eastward from the Rockies into the High Plains. Showers will spread from the Pacific Northwest to the Intermountain West Wednesday and Thursday ahead of an approaching Pacific front. Afternoon temperatures will rise well into the 70s and 80s across much of the Northern Rockies, 10 to 15 degrees above average. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php