773 FXUS01 KWBC 110753 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 352 AM EDT Sun Oct 11 2026 Valid 12Z Sun Oct 11 2026 - 12Z Tue Oct 13 2026 ...Moisture from Post-Tropical Cyclone Rachel brings heavy rain and flash flooding to the southwestern U.S. through Monday... ...Post-Tropical Cyclone Isaias brings widespread rainfall across the Eastern states... ...First winter storm of the season forecast for the Northern Rockies this weekend... An active weather pattern remains in place across the Lower 48 to close out the weekend. Post-Tropical Cyclone Isaias is tracking toward the central Appalachians, spreading widespread showers and thunderstorms into the Mid-Atlantic and Northeast this morning ahead of a cold front wrapping into its center. Steady soaking rainfall will continue all day, which could lead to isolated or scattered flash flooding and severe weather before the system accelerates into the western Atlantic on Monday. The next chance for rain will arrive over the Northeast and New England on Tuesday as a developing frontal system on slides into the Upper Midwest; no excessive rainfall threat is expected with this activity. Meanwhile, heavy rainfall and flash flooding will also make weather headlines across the Western U.S. as Post-Tropical Cyclone Rachel moves inland across the Desert Southwest today. A Moderate Risk of excessive rainfall is valid from Southern California to southern Utah where an enhanced corridor of heavier rainfall is expected to develop near a frontal boundary. Through tomorrow, the potential exists for rainfall totals to exceed three inches across the higher terrain of the Peninsular Ranges, southeastern Nevada, and the southern Wasatch Range, while generally 1-2 inches are possible for lower elevations. This could easily result in numerous instances of flash flooding. Temperatures north of the front across Montana will be much colder, resulting in snow across the higher terrain of central and western Montana. Some areas could exceed a foot of snowfall through Monday afternoon. A temperature dichotomy will exist across the country through Monday. Conditions will remain well above average over much of the central U.S. with widespread highs into the 80s and even lower 90s for the Northern/Central Plains into the Upper Midwest and 90s for the Southern Plains. There will likely be some new daily record highs established as a result. The cold front in the West will bring much colder temperatures in the 40s to portions of the northern High Plains Sunday. For the East, highs will vary around average with relatively cooler temperatures in vicinity of the widespread clouds and rain associated with the remnants of Isaias. Forecast highs are generally in the 70s for the Southeast with 60s for the Northeast. Asherman/Hamrick Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$