Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 426 PM EDT Tue Aug 25 2015 Valid 00Z Wed Aug 26 2015 - 00Z Fri Aug 28 2015 ...Cold front to bring showers and thunderstorms to the Eastern Seaboard... ...Scattered showers and thunderstorms possible for the southern plains, Southwest, and the central Rockies... ...Dry conditions to continue for the Pacific Northwest... The western states, primarily east of the continental divide, will be a bit more active as the a series of upper-level disturbances move through. With the presence of increased monsoonal moisture, portions of the Desert Southwest, Central and Southern Rockies will see an increase in shower and thunderstorm activity through Thursday evening. West of the divide - dry conditions with above average temperatures will persist over the next couple days, as high pressure at the mid and upper-levels of the atmosphere remains in place. A low pressure system and associated cold front will slowly track over the Gulf of Alaska. Scattered showers and thunderstorms are expected along and ahead of this system; Western British Columbia will maintain shower activity today through Thursday evening. Portions of the Coastal Mountains will have more widespread cloud cover and showers. The frontal system that has been nearly stationary over the Intermountain West will finally progress toward the Northern and Central Plains over the next couple of days as it gain support from the upper-level jet. Scattered showers and thunderstorms will accompany this system, especially through Wyoming and the Dakotas. The slow-moving cold front, that stretches from the Hudson Bay through New England and the Mid-Atlantic and down though the Carolinas and Gulf of Mexico will continue propagating eastward. Portions of Texas, coastal Southeast and the eastern seaboard are expected to have scattered showers and thunderstorms through Thursday evening. Areas of more widespread and intense showers and thunderstorms are likely to develop over portions of Ontario and Quebec as ample moist air wraps around the low pressure center. Behind the cold front, a cool and dry air mass will remain in place across much of the Midwest, Great Lakes, and Ohio valley. Afternoon high temperatures will be 10 to 20 degrees below normal in some areas. The below average temperatures will move eastward into the Appalachians on Wednesday. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php