Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Riverton WY
218 AM MDT Wed Aug 13 2025

WYZ001>020-022>030-141300-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn Basin-
Owl Creek and Bridger Mountains-Bighorn Mountains West-
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-Teton and Gros Ventre Mountains-
Jackson Hole-Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
218 AM MDT Wed Aug 13 2025

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and tonight.

Critical fire weather for portions of the area due to warm
temperatures, low relative humidities, gusty winds, and thunderstorm
chances. Please see Red Flag Warnings for details. Elevated fire
weather possible many other locations.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...Elevated to critical fire weather, especially across
southern Wyoming.

Thursday through Sunday...A chance of afternoon and evening
thunderstorms each day, with Friday looking to have the greatest
coverage.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

$$

URGENT - FIRE WEATHER MESSAGE
National Weather Service Pocatello ID
154 AM MDT Wed Aug 13 2025

...RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY
FOR GUSTY WINDS, LOW RELATIVE HUMIDITY, AND ISOLATED
THUNDERSTORMS FOR FIRE WEATHER ZONES 411, 413, 427, 475 AND 476...

...RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY
FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES
410, 422 AND 425...

IDZ410-411-413-140400-
/O.CON.KPIH.FW.W.0015.250813T1800Z-250814T0400Z/
Upper Snake River Valley/Idaho Falls BLM-
Centennial Mountains and Snake River Range/Targhee NF-
Caribou Range/Caribou NF-
154 AM MDT Wed Aug 13 2025

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 10 PM
MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR
FIRE WEATHER ZONES 410...

..RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY
FOR GUSTY WINDS, LOW RELATIVE HUMIDITY, AND ISOLATED THUNDERSTORMS
FOR FIRE WEATHER ZONES 411 AND 413...

The National Weather Service in Pocatello has issued a Red Flag
Warning for gusty winds and low relative humidity, which is in
effect from noon to 10 PM MDT Wednesday.

* AFFECTED AREA...Fire Weather Zone 410 Upper Snake River
  Valley/Idaho Falls BLM, Fire Weather Zone 411 Centennial
  Mountains and Snake River Range/Targhee NF and Fire Weather
  Zone 413 Caribou Range/Caribou NF.

* WINDS...Southwest 15 to 25 mph with gusts up to 35 mph. Isolated
  thunderstorms may produce gusts over 45 mph across Zones 411 and
  413.

* RELATIVE HUMIDITY...10 to 20 percent.

* IMPACTS...The combination of dry fuels, gusty winds, low
  humidity and potential for lightning will lead to increasing
  fire spread and more extreme fire behavior.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly based on these criteria
for Southeastern Idaho:

- Relative humidity at or below 15 percent and wind gusts of at
least 25 mph in the mountains, or 30 mph in the Snake Plain.

- Thunderstorm coverage of 25 percent, without specific rainfall
criteria.

- Other high impact events deemed critical by the National
Weather Service and area fire management agencies.

&&

$$

Hazard Report Provided By forecast.weather.gov