Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 348 AM EDT Mon Aug 31 2020 Valid 12Z Mon Aug 31 2020 - 12Z Wed Sep 02 2020 ...Heavy rainfall and flash flood threat across parts of the central Appalachians as well as the south-central Plains; severe weather possible on Monday for parts of the southern Plains into Missouri Valley... ...Heat advisories in effect for parts of the South, while much below normal temperatures overspread the Northern Rockies and Plains... ...Locally heavy rain possible in the Southwest while fire weather remains a threat across the Central Great Basin... A warm front lifting northward through the Mid-Atlantic states today (Monday) will bring showers and storms to the region. Heavy rainfall and flash flooding is possible, particularly across parts of the central Appalachians where WPC has a slight to moderate risk. Meanwhile, a very slow moving and wavy frontal boundary from the Mid-Mississippi Valley to the south-central Plains will provide focus for widespread showers and thunderstorms, some of which could contain heavy rainfall and severe weather. Both WPC and SPC show slight risks for flash flooding and severe thunderstorms, respectively, for Monday. The heavy rainfall and flash flood threat continues into Tuesday as the front effectively stalls across the region. To the south of this boundary, expect generally unsettled conditions across much of the Deep South within a warm and humid airmass on Monday. Heat advisories remain in effect across parts of southern and eastern Texas into Louisiana where daytime highs in the 90s to near 100 (with heat indices making it feel even warmer) are possible on Monday. Behind the front, a much cooler airmass will overspread the northern and central Rockies and Plains states today, with daytime highs 10 to 20 degrees below normal. Temperatures may be cold enough to support mixed precipitation or light snow in the higher elevations of the Northern Rockies as well. Monsoonal moisture into parts of the Southwest will continue the threat for locally heavy rainfall through Tuesday. To the north, dry and windy conditions on the backside of a cold front will bring elevated to critical fire weather concerns for Monday across the Central Great Basin where widespread red flag warnings are in effect. Upper level ridging should build across the West Coast states by Tuesday, with above normal temperatures likely. Elevated fire weather concerns should also shift northward into the Northern High Plains as another cold front ushers in dry weather and gusty winds. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php