Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 303 PM EDT Fri May 27 2016 Valid 00Z Sat May 28 2016 - 00Z Mon May 30 2016 ...Severe thunderstorms and flash flooding possible for portions of the southern and central plains... ...Showers and thunderstorms increasing across the coastal Southeast this weekend... ...Above average temperatures expected to continue for the Great Lakes, Mid-Atlantic, and Northeast... A frontal boundary with multiple areas of low pressure will move slowly across the central U.S. tonight. Moist and unstable southerly flow from the Gulf of Mexico will keep scattered to numerous showers and thunderstorms in place along the western Gulf Coast this evening. Some thunderstorms may be severe across portions of the central and southern plains, where the Storm Prediction Center is forecasting a slight risk of severe thunderstorms. Additionally, showers and thunderstorms may produce heavy rainfall -- and flash flooding is possible for some areas. Scattered showers and thunderstorms will continue across the central U.S. on Saturday and Sunday as well, as the frontal boundary stalls and then begins moving back north as a warm front across the southern plains. Showers and storms should be more scattered in nature for most of the central U.S. this weekend as the upper-level system responsible for the more widespread activity moves away from the region. Locally heavy rain will still be possible, however. An area of low pressure is forecast to slowly develop off the Southeast U.S. coastline over the next couple days as it moves westward toward the coast. Showers and thunderstorms will overspread the Carolinas late Saturday night. Showers and thunderstorms will increase in coverage and spread northward up the Mid Atlantic on Sunday. Locally heavy rain will be possible across these areas and could result in flash flooding. Scattered showers and thunderstorms will also be possible across the Rockies through the next couple days as a frontal system moves slowly east across the region. The trailing end of the front will become stationary by Saturday night, keeping isolated to scattered showers and storms across the central Rockies into Sunday. A ridge of high pressure at the mid and upper-levels of the atmosphere will keep warm temperatures in place from the Great Lakes to the Mid-Atlantic and Northeast today and into the weekend. Afternoon high temperatures are forecast to be 10 to 15 degrees above average over these areas today. On Saturday, areas of the Northeast could approach 20 degrees above average. Ryan/Krekeler Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php