676 FXUS01 KWBC 282005 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Fri Aug 28 2026 Valid 00Z Sat Aug 29 2026 - 00Z Mon Aug 31 2026 ...Slight risk of severe thunderstorms over parts of the Northern Plains and the Great Basin on Saturday... ...Slight risk of excessive rainfall across portions of Arizona this weekend... A frontal system is forecast to gradually slide off New England and the Mid-Atlantic coast through the weekend, bringing fine and cooler than normal temperatures for late August for the entire northeastern quarter of the country. Meanwhile, the trailing portion of the front will remain nearly stationary across the Southeast, where showers and thunderstorms are expected to be most active during the late-day hours. A weak low pressure area just off the central to eastern Gulf Coast will also keep a good chance of showers and thunderstorms in the vicinity for the next couple of days. Any heavy downpours associated with these storms should bring mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas being the most vulnerable. Meanwhile, monsoonal showers and thunderstorms will be most active during the late-day hours across the Four Corners to the Great Basin where a slight risk of excessive rainfall is anticipated through this weekend. Meanwhile, an upper-level trough edging into the Pacific Northwest will interact with a weak front and the pre-frontal monsoonal moisture to keep a good chance of showers and some embedded thunderstorms from the Great Basin to the northern Rockies where a marginal risk of excessive rainfall is forecast through the weekend. Locally heavy rain may lead to localized rapid runoff from streams, resulting in flash flooding. The trough pushing through the Pacific Northwest will first bring rain showers from west to east closer to the Canadian border this weekend. A low pressure system will then gradually develop over the northern High Plains. A slight risk of severe thunderstorms is anticipated over parts of the Northern Plains and the Great Basin on Saturday into early Sunday as the upper trough edges closer and the low pressure system develops and expands in size. Otherwise, some showers and a few embedded thunderstorms can be expected across the Great Lakes to northern New England as a cold front dips into the region through this weekend. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php Extreme Heat Key Messages available at: https://www.wpc.ncep.noaa.gov/key_messages/LatestKeyMessage_1.png $$