589 FXUS01 KWBC 100806 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 405 AM EDT Sat Oct 10 2026 Valid 12Z Sat Oct 10 2026 - 12Z Mon Oct 12 2026 ...Hurricane Isaias brings life-threatening storm surge, damaging winds, heavy rain, and severe weather to southern Alabama and the Florida Panhandle. Flash flooding and severe weather spreading into the Southeast and Appalachians... ...Moisture from Tropical Storm Rachel will bring heavy rain, flash flooding, and high winds to Southern California, the Southwest, and Great Basin late Saturday into Sunday... ...First winter storm of the season forecast for the Northern Rockies this weekend... An active and dangerous period of weather is in store this weekend as two tropical systems and a winter storm produce widespread and wide-ranging impacts across the Lower 48. The first of these systems, Hurricane Isaias, made landfall several hours ago near Destin, Florida and is presently taking a northward track inland. While Isaias is rapidly losing tropical characteristics, this storm is no less dangerous as hurricane-force winds and life-threatening storm surge continue to batter portions of coastal Alabama and the Florida Panhandle. Moreover, bands of thunderstorms spiraling around Isaias will maintain the threat of significant flash flooding and a few tornadoes from South-Central Alabama to the Florida Panhandle this morning. While Isaias undergoes extratropical transition over the next 24 hours, impactful heavy rainfall and severe weather will shift into the Southeast and Lower Mid-Atlantic. Portions of the Southern Appalachians are of particular concern for flash flooding today, where landslides are possible. By Sunday, the remnants of Isaias are expected to race toward the Mid-Atlantic and Northeast, which could support isolated instances of flash flooding before pulling away on Monday. Meanwhile, Tropical Storm Rachel in the Pacific will approach southern California late Saturday night, ushering in heavy rainfall, flash flooding, and strong winds both across Southern California, the Desert Southwest, and Great Basin. Numerous instances of flash flooding can be expected near the Peninsular Ranges of Southern California today, and over portions of the Colorado River Valley on Sunday. By Monday, the tropical moisture associated with Rachel's remnants will begin to wash out, although scattered flash flooding remains possible over the Desert Southwest and Great Basin, which could certainly exacerbate flood impacts from this weekend. Rainfall aside, the threat for gusty winds will extend well inland across portions of the Desert Southwest and Great Basin, with the highest gusts focused in the higher terrain. To the north of the rainfall, a seasonably deep upper-low will move into the Northwest/Northern Rockies and lead to the first winter storm for portions of the the Northern Rockies. The heaviest snow is expected for higher mountain elevations with totals of 10-20" possible over Central Montana through tomorrow morning. A significant change is in store temperature-wise over the western U.S. following a period of well above average conditions including excessive heat for portions of California and the Desert Southwest. Following one more day of widespread highs in the 80s (with 90s to 100s in the Desert), the noted deep-upper low and associated cold front will bring much cooler temperatures southward through the weekend. Highs only in the 40s to low 60s will spread through the Northwest/Northern Rockies and northern California Saturday, with highs falling into the 50s and 60s for the Great Basin/coastal California and 70s to low 80s for the Desert Southwest/central California Sunday. Some Frost/Freeze-related Advisories and warnings are in effect for portions of the Northwest as lows fall into the 30s. Conditions will remain well above average over much of the central U.S. with widespread highs into the 80s and even low 90s for the northern/central Plains into the Upper Midwest and 90s for the southern Plains. Some near-record tying/breaking highs will be possible. 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 more relatively cooler temperatures in vicinity of the widespread clouds/rain associated with Isaias. Forecast highs are generally in the 70s for the Southeast with 60s for the Northeast. Asherman/Putnam Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$