Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 311 AM EDT Sun Jun 25 2017 Valid 12Z Sun Jun 25 2017 - 12Z Tue Jun 27 2017 ...Severe thunderstorms and heavy rain possible today across portions of the Southwest and the southern High Plains... ...Dangerously hot temperatures expected again today for much of the Pacific Northwest and portions of the Southwest... A stationary frontal boundary is forecast to linger from southern Texas to portions of the Southwest through the next couple days as it gradually weakens. The front will provide a focus for scattered showers and thunderstorms, especially during the afternoon and evening. Severe thunderstorms as well as heavy rainfall will be possible with these storms from the southern Rockies of New Mexico and portions of the adjacent High Plains. Farther east, the same frontal boundary will also produce scattered to numerous showers and thunderstorms along the Gulf Coast and across eastern portions of the Carolinas today; locally heavy rainfall is possible. Farther north, scattered showers and storms will be possible today from the Upper Great Lakes to New England as an upper-level disturbance passes overhead. Temperatures are forecast to generally be below average today and Monday, especially across the Great Lakes where highs may remain in the 60s for many locations. High pressure at the mid and upper-levels will persist for another day along the West Coast, resulting in another day of extreme heat for the Pacfic Northwest as well as portions of the Southwest. Highs today are forecast to be 15 to 25 degrees above average across much of the Northwest, with many locations reaching well into the 90s to even near 100 degrees. Across the Southwest, the heat will not be as extreme as in recent days, but high temperatures are nonetheless forecast to be 5 to 15 degrees above average, with many areas reaching well into the 100s or 110s. On Monday, the upper ridge will move a bit east, resulting in rising temperatures for the northern Rockies, while the Northwest begins a gradual cooling trend that will continue through the early workweek. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php