Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 322 AM EDT Thu Aug 07 2014 Valid 12Z Thu Aug 07 2014 - 12Z Sat Aug 09 2014 ...Heavy rain and flash flood potential shifts east across the Middle Mississippi Valley into the central and southern Appalachians today and Friday... A slow moving front will remain in place through the remainder of the week from the southeastern U.S. coast to the central High Plains. Much of the heat and humidity typically found during early August will be near and south of this frontal boundary with highs well into the 90s and even a few 100s possible today and Friday across Texas and Oklahoma. Meanwhile, locations north of the front, especially from the Great Lakes to the Northeast, will experience somewhat cooler than average temperatures and humidity with high temperatures generally in the 70s and 80s. While no major weather systems are forecast across the lower 48, there will be increased chances for heavy rain with flash flood potential from the Middle Mississippi Valley into the central and southern Appalachians today and Friday. These areas of heavy rain will occur ahead of a low moving along the front from Missouri today and into Kentucky by Saturday morning. There will also be the potential for organized heavy rain late this evening from northeastern Colorado into western Nebraska/Kansas as scattered afternoon thunderstorms meet up with increasing moisture from the south after sunset. Out West, anomalous moisture which has been in place during much of the week will be reduced today, but a potent upper level circulation will remain, tracking from southern Idaho to western Wyoming today and tonight. The threat for flash flooding will be in place near this upper level disturbance into early Friday morning. Scattered, diurnally driven thunderstorms will be common over portions of the Great Basin and Rocky Mountains today and Friday, but no widespread flash flooding is anticipated. Otto Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php