Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 252 PM EDT Wed Sep 23 2015 Valid 00Z Thu Sep 24 2015 - 00Z Sat Sep 26 2015 ...Flash flooding possible along a swath from north-central Kansas to southern Minnesota... ...Showers and thunderstorms will increase over the coastal southeastern U.S. over the next couple days... Numerous showers and thunderstorms will persist along a west-east oriented frontal this afternoon and evening as an upper-level disturbance moves through the region. Much of the Great Plains and Upper Midwest have forecast rainfall amounts of 0.50 to 2 inches, with isolated areas of 3 inches through Friday. Many locations have already received 2 to 4 inches, with a few 5+ reports near the South Dakota/Iowa border this morning. Additional rainfall, combined with adequate antecedent moisture, will raise the threat for flash flooding. Another system will move through the Pacific Northwest on Thursday and into the northern Rockies on Friday. Shower activity will accompany this system, primarily affecting coastal Washington and British Columbia over the next couple of days. An area of low pressure located offshore of the Southeast will continue to drift slowly westward over the next couple days. The extent of convention will steadily increase as the low and associated frontal boundary approaches the coast Thursday and Friday. The bulk of the heavy rain is forecast over the Atlantic; however the Carolinas could see rainfall amounts of 2 to 4 inches by Saturday. Flash flooding may be of concern for portions of Central/Southern Appalachians Friday through Saturday morning. Temperatures across the contiguous U.S. will be above average. The Intermountain West will see afternoon high temperatures 10 to 15 degrees above average; while areas from the Midwest to the Northeast will see temperatures 5 to 10 degrees above average. The 6-10 and 8-14 day temperature outlooks issued by the Climate Prediction Center depict temperature across most of the lower 48 states to remain above seasonal average. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php