Red Flag Warnings put eastern Montana and eastern Wyoming first for fire-weather risk
TODAY'S FIRE WEATHER BRIEF
Red Flag Warnings put eastern Montana and eastern Wyoming first for fire-weather risk
Active Red Flag Warnings in parts of eastern Montana and eastern Wyoming are today’s highest-priority fire-weather hazard, with wind-driven spread possible where fine fuels are cured. Outside the warned areas, afternoon winds near Great Fal
Active Red Flag Warnings in parts of eastern Montana and eastern Wyoming are today’s highest-priority fire-weather hazard, with wind-driven spread possible where fine fuels are cured. Outside the warned areas, afternoon winds near Great Falls and Billings and daytime east winds from Phoenix to Tucson add localized spread potential in grass, brush and desert fuels.
Morning assessment
The national fire-weather pattern is led by wind, with heat sharpening the risk in parts of the interior West and Southwest. NOAA’s Storm Prediction Center separately highlights an Elevated fire-weather area in portions of southern California tied to weak offshore flow, above-normal temperatures and 15% to 20% relative humidity; that outlook does not replace the active local Red Flag Warnings in the Rocky Mountain alert set.
The main change this morning is alert-driven: parts of the northern High Plains are already under Red Flag criteria, meaning local weather and fuel thresholds are being met or are expected to be met. Elsewhere, the concern is more localized and forecast-based, centered on afternoon wind peaks, heat and how receptive grasses, brush and cured fine fuels are by peak burning period.
Areas of greatest concern
Eastern Montana and eastern Wyoming Red Flag Warning areas
Active Red Flag Warnings make these warned zones the clearest immediate concern. A Red Flag Warning means fire-weather thresholds set by the local National Weather Service office are being met or expected, and fires that start in exposed grass, brush or cured fine fuels can move quickly under wind.
Reason/timing: The driver is wind-driven critical fire weather in the eastern Montana and eastern Wyoming warning areas today while alerts remain active. The key uncertainty from the supplied alert summary is the exact local timing and magnitude of wind and humidity peaks, so the warning text from the responsible NWS offices remains the controlling source.
Great Falls-to-Billings wind corridor, central and eastern Montana
Forecast grids show a notable afternoon wind signal without an active warning at the sampled points. Great Falls is forecast for west-southwest wind of 9 to 17 mph with gusts as high as 30 mph, while Billings is forecast for west wind of 12 to 17 mph.
Reason/timing: The driver is afternoon and terrain-influenced west to southwest wind over plains, ridges and open slopes near Great Falls and Billings. The uncertainty is whether humidity and local fuel conditions line up with the gust peak strongly enough to approach warning-level behavior; no Red Flag Warning is currently noted for those points.
Phoenix–Tucson east-wind and heat corridor, central and southern Arizona
Daytime east winds and hot temperatures raise the fire-growth potential in desert shrub, grass, brush and mixed interface fuels. Tucson is forecast for east wind of 7 to 17 mph with gusts up to 32 mph, while Phoenix is forecast for east wind of 5 to 15 mph with gusts up to 25 mph and a high near 98 degrees; Tucson’s high is near 93.
Reason/timing: The driver is daytime heat combined with sustained east winds and gusts from the Phoenix area south toward Tucson. The key uncertainty is fuel receptiveness at the incident scale, since no active fire-weather warning is listed for these Arizona points and the supplied precipitation chance is outside Arizona near Roswell.
What to watch through tonight
– Eastern Montana and eastern Wyoming warning areas: Any update to Red Flag Warning timing, coverage or local wind/RH wording will be the most important change for crews, officials and reporters tracking today’s risk.
– Great Falls–Billings corridor: The afternoon gust peak is the decision point; west to southwest winds near Great Falls could reach 30 mph, while Billings has sustained west winds of 12 to 17 mph.
– Phoenix–Tucson corridor: Watch whether east winds peak during the hottest part of the day, with gusts forecast up to 32 mph at Tucson and up to 25 mph at Phoenix.
– Redding and Chico, northern Sacramento Valley: Heat is the main watch item, with Redding near 101 degrees and Chico near 99; poor afternoon recovery or lingering smoke could keep fine fuels more available for ignition.
– North Platte, western Nebraska: South winds of 10 to 20 mph with gusts near 30 mph bear watching over grassland if the gust peak overlaps low humidity and cured fuels.
Fuel and drought context
Grass, brush, timber and cured fine fuels are the relevant carriers in the northern Rockies and High Plains, while Arizona’s concern is tied more to desert fuels, brush, grass and interface areas exposed to daytime east winds. The U.S. Drought Monitor shows substantial moderate-to-severe drought across parts of the West and Southern Plains, but drought is background susceptibility, not proof of critical fire weather at a specific point today.
Bottom line
The most actionable fire-weather threat today is in the active Red Flag Warning areas of eastern Montana and eastern Wyoming; elsewhere, the main concern is localized afternoon wind and heat aligning with dry grass, brush and cured fine fuels.
Information is for situational awareness and should not replace official forecasts, warnings, or operational decision-making.
