Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 321 PM EDT Sat Jul 27 2024 Valid 00Z Sun Jul 28 2024 - 00Z Tue Jul 30 2024 ...Flash flooding possible in the Tennessee Valley/southern Appalachians Sunday/Monday... ...Hot temperatures for portions of the Northern Plains and Upper Midwest; severe thunderstorms and heavy rain possible into Sunday... ...Cooler than normal for much of the West with monsoonal thunderstorms for portions of the Rockies/Southwest... Typical summertime pattern is in full swing across much of the Lower 48 this weekend into early next week. A weakening frontal boundary over the Southeast will act as a focus for scattered showers and thunderstorms this afternoon/early evening and again on Sunday, even after the boundary dissipates. The warm/moist southerly flow out of the Gulf of Mexico will support the chance for flash flooding over the Tennessee Valley Sunday and into the southern Appalachians on Monday. High pressure over the East Coast that brought in a bit drier air to the region will slowly move to the coast by Monday, allowing a slow climb of humidity values with typical late July temperatures in the 80s to around 90. Temperatures over much of the Lower MS Valley into coastal Texas will be a few degrees below normal (but still into the upper 80s to around 90) thanks to mostly cloudy skies and high chances of rain. In the middle of the country, hot temperatures are expected over the central Plains Sunday/Monday -- upper 90s to low 100s. Farther north, a frontal boundary will favor scattered shower and storms on Sunday, where the Storm Prediction Center has highlight a Slight Risk (level 2/5) for severe weather over parts of South Dakota southward through central Nebraska. Into Minnesota, locally heavy rainfall could result in areas of flash flooding on Sunday. WPC has placed portions of MN in a Slight Risk (level 2/4) for excessive rainfall. Over the West, cooler than normal temperatures will continue for another couple of days over areas west of the Rockies. Still, highs will reach into the 80s to low 90s over interior locations but perhaps stay in the 60s along the immediate coast of NorCal northward. Smoke from wildfires will continue to plague parts of the West (NorCal eastward/northeastward into Montana), resulting in poor air quality and areas of reduced visibility. Affected residents are urged to stay indoors if possible with windows and doors closed. Fracasso Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php