Valid 2026-09-09 12:00 UTC – 2026-09-10 12:00 UTC

Synopsis

An upper-level trough over the northern High Plains will move into the Great Lakes region today while broad ridging encompasses much of the southern CONUS. The exiting trough and related diminishing surface pressure gradient will discourage widespread fire weather concerns across parts of the Northern Rockies and northern High Plains. However, dry and breezy conditions should bring a targeted, terrain-influenced fire weather risk to portions of WY today.

Central/Southern Wyoming

Elevated fire weather conditions are likely to develop leeward of more prominent mountain ranges and wind prone areas in central and southern WY, where elevated highlights have been introduced. West to northwest winds of 10-15 mph (localized 20 mph), afternoon RH reductions of 5-15% and receptive fuels including ERC values around the 90th percentile will combine to support an elevated fire weather risk across portions of central/southern WY.

Western CONUS

A warming and drying event will continue for much of the West as an upper ridge builds into the Southwest, although weak surface pressure gradients and resultant lighter wind regime amid marginal fuels will preclude broader fire weather concerns.

Williams · 09/09/2026