Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 417 AM EDT Fri Aug 02 2024 Valid 12Z Fri Aug 02 2024 - 12Z Sun Aug 04 2024 ...A dangerous heat wave will impact much of the East Coast, Southeast and Northwest through tonight... ...Excessive Rainfall concerns across portions of the Eastern U.S. this weekend... ...Monsoonal storms continue across the Southwest/Four Corners through the weekend... A familiar upper-level pattern over the lower 48, with ridging in the West and troughing over the Great Lakes and Ohio/Tennessee Valley, will support heat waves and excessive rainfall concerns this weekend. High temperatures in the 100s will represent a 10-15 degree positive anomaly across the Northwest today. Some of these temperatures will tie or break records. Overnight temperatures in the upper 60s to upper 70s will tie or break widespread temperature records across the West tonight as well. The combination of very hot daytime conditions and a lack of overnight relief could harm those without adequate shelter or hydration. Cloudy conditions will support near record breaking warmth over portions of the coastal Northeast and Florida peninsula tonight. Showers and thunderstorms will develop along a cold front moving through the Midwest today and spread eastward toward the East Coast. Slight Risks of Excessive Rainfall leading to Flash Flooding are in effect for portions of the Lower Great Lakes, Ohio Valley and Northeast today due to the higher rates within some of the storms that move through those areas. Orographic lift over portions of the Central/Southern Appalachians will promote additional Flash Flooding concerns, hence another Slight Risk area for parts of eastern Tennessee, southeastern Kentucky, southwestern Virginia, western North Carolina and northern Alabama/Georgia. The cold front slows down across the Mid-Atlantic/Southeast on Saturday and becomes the focus for additional Excessive Rainfall concerns, due in part to a significant moisture plume from the Tropics. A Slight Risk of Excessive Rainfall is in effect for portions of southeastern Virginia down into the Carolina/Georgia Piedmont. A tropical disturbance is forecast to impact the Florida Peninsula beginning late tonight when heavy rainfall and thunderstorms are supposed to spread across southern Florida and eventually work their way up the peninsula on Saturday. A Slight Risk of Excessive Rainfall is in effect for portions of southern Florida on Saturday as a result. Monsoonal moisture is expected to continue flowing into the Southwest/Four Corners region this weekend. Scattered showers and thunderstorms may lead to isolated Flash Flooding across portions of the aforementioned areas, particularly burn scars and slot canyons. Kebede Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php