Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 341 AM EDT Thu Aug 11 2022 Valid 12Z Thu Aug 11 2022 - 12Z Sat Aug 13 2022 ...Heavy rain and flash flooding threat continues along the Gulf Coast and across portions of the Mississippi Valley, Great Lakes and Ohio Valley... ...Monsoonal storms and the potential for flooding to continue for portions of the Southwest into the Great Basin and Rockies... ...Above-normal temperatures are expected from the northern Intermountain West into the northern and central Plains, while much of the East begins to cool down through late in the week... Daily shower and thunderstorm activity is expected to persist across the Southwest and into portions of the Great Basin and Rockies. Southerly winds sandwiched between low pressure positioned off of the Pacific Northwest coast and high pressure anchored over the Rockies and High Plains will continue to transport a deep layer of moisture northward from the Southwest into portions of the Great Basin and Rockies. There is an elevated threat for localized flooding. Additionally, above normal daily temperatures are forecast to continue throughout the northern Intermountain West and Northern Rockies, while the heat also builds east out across the northern and central Plains through Friday. A quasi-stationary front from the Mid-Atlantic and draped through the Tennessee Valley and northern Gulf states/Lower Mississippi Valley will act as a focus for multiple rounds of showers and thunderstorms. As the front continues to sag slowly south, very moist air ahead of the front will support showers and thunderstorms capable of producing heavy rainfall. A secondary cold front is expected to sweep through the region by late in the week. This feature will usher in cooler and drier air, which will allow temperatures to dip to near or below seasonal average. across the Eastern U.S. by the weekend. The first frontal boundary will slowly weaken as it stalls over the Gulf states; with ample moisture and weak winds expected, slow-moving storms will be capable of producing heavy rain. There is potential for localized excessive rainfall and flooding. Campbell Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php