300
WWUS85 KPIH 211841
RFWPIH

URGENT - FIRE WEATHER MESSAGE
National Weather Service Pocatello ID
1241 PM MDT Fri Aug 21 2026

...CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED ON SATURDAY DUE
TO SCATTERED THUNDERSTORM ACTIVITY ACROSS MUCH OF EASTERN
IDAHO...

IDZ410-422-425-427-475-476-221200-
/O.NEW.KPIH.FW.W.0022.260822T1800Z-260823T0300Z/
Upper Snake River Valley/Idaho Falls BLM-
Sawtooth Range/Northern Sawtooth NF-
Middle Snake River Valley/Twin Falls BLM north of the Snake River-
Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls
BLM south of the Snake River-
East Salmon River Mountains/Salmon NF-
Lemhi and Lost River Range/Challis NF-
1241 PM MDT Fri Aug 21 2026

...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SATURDAY FOR
SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 422, 425,
427, 475, AND 476...

The National Weather Service in Pocatello has issued a Red Flag
Warning for scattered thunderstorms, which is in effect from noon
to 9 PM MDT Saturday.

* AFFECTED AREA...Fire Weather Zone 410 Upper Snake River
  Valley/Idaho Falls BLM, Fire Weather Zone 422 Sawtooth
  Range/Northern Sawtooth NF, Fire Weather Zone 425 Middle Snake
  River Valley/Twin Falls BLM north of the Snake River, Fire
  Weather Zone 427 Goose Creek and Raft River Valley/Southern
  Sawtooth NF/Twin Falls BLM south of the Snake River, Fire
  Weather Zone 475 East Salmon River Mountains/Salmon NF and
  Fire Weather Zone 476 Lemhi and Lost River Range/Challis NF.

* IMPACTS...Frequent lightning will increase risk of new fire
  starts.

* THUNDERSTORMS...Scattered coverage with frequent lightning.

* OUTFLOW WINDS...Gusty and erratic winds to 60 mph.

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.

&&

$$