155 FXUS01 KWBC 050803 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Mon Oct 05 2026 Valid 12Z Mon Oct 05 2026 - 12Z Wed Oct 07 2026 ...Heavy rainfall threat gradually edges off the Gulf Coast as showers and storms persist in Florida... ...An October heatwave will remain across central and southern California into this week... ...Autumnal chill will overspread the Great Lakes and Northeast behind a cold front... A frontal boundary responsible for the recent wet weather pattern along the Gulf Coast region is forecast to slowly edge farther south over the next couple of days. The heaviest bands of rain remain just off the western Gulf Coast early this morning, except in extreme southern Texas where some heavy rain manages to move onshore. Meanwhile, moderate to locally heavy rain are moving across the eastern Gulf Coast region where a Flood Watch remains in effect for much of today. As the front edges ever so slowly south, the heavy rain threat along the Gulf Coast will gradually diminish. However, slow-moving thunderstorms could still bring locally heavy rain today and possibly into Tuesday morning from the Georgia-Florida border to northern Florida. Scattered showers and thunderstorms will continue to bring a marginal threat of excessive rainfall across northern Florida for the next couple of days. Meanwhile, an anomalous upper-level ridge of high pressure will maintain a late season October heat wave across southern and central California into the Great Basin. Temperatures will run 15 to 20 degrees above normal, bringing highs well into the 90s toward the coast and adjacent urban areas, with some areas in the Central Valley of California soaring into the lower 100s. Overnight lows in the mid to upper 70s in the Los Angeles and San Diego urban areas will provide little relief through the heatwave. Extreme Heat Warnings are in effect for portions of Southern California and the interior deserts, while Heat Advisories extend across the Central Valley and Bay Area. A piece of this warm air mass is spreading northeastward across the Great Basin into the northern Rockies where high temperatures in the middle and upper 80sâ€â€around 10 to 20 degrees above averageâ€â€will challenge some daily high temperature records. These unseasonably warm temperatures will combine with gusty winds and low relative humidity to also bring a fire weather risk today for the northern Rockies to the northern High Plains. In contrast to a summer feel-like heat across the West, a cold front moving across the Great Lakes this afternoon and across the Northeast on Monday will bring an autumnal chill. High temperatures in the 60s and even some upper 50s will be possible from Michigan to Maine with widespread morning low temperatures in the middle 30s to middle 40s. This is one of the first cold shots of the fall season and will bring some agricultural risk. Frost Advisories and Freeze Warnings are in effect for Monday morning across portions of Minnesota and Wisconsin. The cold front will then progress southward and bring a taste of fall to parts of the Southeast as far south as Tennessee and the Carolinas by Tuesday, and especially on Wednesday when the core of a cool high pressure builds into the eastern U.S. Some showers are expected to move across interior Northeast today as a reinforcing front moves across. Expect high temperatures in the low 70s to the low 80s with cool morning low temperatures in the 40s and 50s. Enjoy!! Kong/Wilder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$