Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 402 AM EDT Thu Aug 10 2017 Valid 12Z Thu Aug 10 2017 - 12Z Sat Aug 12 2017 ...Showers and thunderstorms expected throughout the Southeast... ...Precipitation to develop along the front from the Great Lakes to Ohio Valley... ...Thunderstorms expected to develop in the central Plains with heavy rainfall possible... Very warm, moist air will transport northward from the Gulf of Mexico as a warm front lifts from the Gulf states northward into the Mid-Mississippi/Tennessee valleys and up the East Coast. Scattered to widespread showers and thunderstorms are expected all across the Gulf states, the Southeast and the Mid-Atlantic regions over the next few days. Onshore flow from the Atlantic Ocean will help to enhance rainfall amounts near coastal North Carolina, although the highest amounts will likely be just offshore of the outer banks. Periods of higher rainfall rates/amounts will be possible, and at this time, a marginal risk for excessive rainfall and flooding in effect for today and into early Friday. The increase in cloud cover over much of the East will keep temperatures near to slightly below seasonal average. A surface low pressure and associated cold front will track across the Upper Midwest into the Great Lakes over the next couple of days. This system will serve as a focus for convection, with moderate to heavy rain possible across the Great Lakes region. Surface high pressure building over the Northern and Central Plains in the wake of the cold frontal passage will cause the trailing edge of the front to bank along the Rockies and reach the Southern High Plains. Widespread to numerous showers and thunderstorms will congregate over this region producing areal averages of 2 to 6 inches. An increased risk for flash flooding will be present over this area into the weekend. In the Pacific Northwest, above normal temperatures and dry weather continue. Interior Oregon, Washington, and northern Idaho will see temperatures in the upper 90s to low 100s through the short range period. The I-5 corridor will also see a continuation of above normal temperatures though not as anomalous as the interior Pacific Northwest. Campbell/Krekeler Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php