Valid 2026-10-11 12:00 UTC – 2026-10-12 12:00 UTC

Synopsis

An upper-level trough will remain in place across much of the western U.S. on D2/Sunday, aiding in the northward transport of deeper tropical moisture into southern California and much of the Intermountain West. At the surface, a frontal system will extend from southern California northeastward into the Great Basin and then eastward into the central Plains. In the wake of this front, mainly dry conditions will continue across the Columbia Basin and northern California, with dry and breezy northerly flow expected to bring an elevated fire weather threat to the northern Sacramento Valley Sunday afternoon.

Northern Sacramento Valley

Following Saturday's cold frontal passage, strengthening northerly winds and dry conditions are expected to support an increasing fire weather threat for portions of the northern Sacramento Valley and adjacent foothills. Sustained northerly winds of 15-25 mph (with locally higher gusts) are forecast to overlap minimum RH values around 20% Sunday afternoon, with the gusty winds the primary driver of fire weather concerns where fuels are receptive.

Chalmers · 10/10/2026