477
WWUS85 KBOI 212320
RFWBOI

URGENT - FIRE WEATHER MESSAGE
National Weather Service Boise ID
520 PM MDT Fri Aug 21 2026

...GUSTY WINDS AND LOW RELATIVE HUMIDITIES ACROSS PORTIONS OF
SOUTHEAST OREGON DISTRICTS...
...SCATTERED THUNDERSTORMS WITH LIGHTNING EXPECTED ACROSS
PORTIONS OF SOUTHWEST IDAHO DISTRICTS...

Pre-frontal winds pick up on Saturday with afternoon wind gusts
up to 35 mph at the same time RHs are 10-15% across Oregon zones
670, 671 and 672. In addition, isolated thunderstorms are
possible over mountains early Saturday increasing in coverage
across portions of Southwest Idaho Saturday afternoon and
evening. Isolated thunderstorms possible across the Vale district
Saturday afternoon with frontal passage. Storms that do develop
will be fairly strong, capable of producing lightning, outflow
gusts up to 50 mph, and heavy rain.

ORZ670>672-222100-
/O.NEW.KBOI.FW.W.0019.260822T1800Z-260823T0300Z/
Burns BLM-Steens Mountain-Southern Grasslands-
420 PM PDT Fri Aug 21 2026

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM PDT SATURDAY FOR
WINDS AND LOW RELATIVE HUMIDITIES FOR BURNS BLM...STEENS MOUNTAIN
AND SOUTHERN GRASSLANDS...WHICH ARE FIRE WEATHER ZONES 670...
671 AND 672...

The National Weather Service in Boise has issued a Red Flag
Warning for winds and low relative humidities, which is in effect
from 11 AM to 8 PM PDT Saturday.

* AFFECTED AREA...In Oregon, Fire Weather Zones 670 Burns BLM,
  671 Steens Mountain and 672 Southern Grasslands.

* TIMING...From 11 AM to 8 PM PDT Saturday.

* WINDS...Southwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...10 to 15 percent.

* TEMPERATURES...86 to 94 degrees.

* THUNDERSTORMS...Isolated coverage with lightning across 671 and
  672.

* IMPACTS...Any fire that develops will catch and spread
  quickly. Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will occur shortly.

&&

$$
W

IDZ401>403-421-424-426-222100-
/O.NEW.KBOI.FW.W.0019.260822T1800Z-260823T0600Z/
Western Payette National Forest-Eastern Payette National Forest-
Northern Boise National Forest-
Southern Boise/Western Sawtooth NF, including the Camas Prairie-
Western Twin Falls BLM-Southern Highlands-
520 PM MDT Fri Aug 21 2026

...RED FLAG WARNING IN EFFECT FROM NOON SATURDAY TO MIDNIGHT MDT
SATURDAY NIGHT FOR LIGHTNING FOR WESTERN PAYETTE NATIONAL
FOREST...EASTERN PAYETTE NATIONAL FOREST... NORTHERN BOISE
NATIONAL FOREST...SOUTHERN BOISE/WESTERN SAWTOOTH NF, INCLUDING
THE CAMAS PRAIRIE...WESTERN TWIN FALLS BLM AND SOUTHERN
HIGHLANDS...WHICH ARE FIRE WEATHER ZONES 401...402...
403...421...424 AND 426...

The National Weather Service in Boise has issued a Red Flag
Warning for lightning, which is in effect from noon Saturday to
midnight MDT Saturday night.

* AFFECTED AREA...In Idaho, Fire Weather Zones 401 Western
  Payette National Forest, 402 Eastern Payette National Forest,
  403 Northern Boise National Forest, 421 Southern Boise/Western
  Sawtooth NF, including the Camas Prairie, 424 Western Twin
  Falls BLM and 426 Southern Highlands.

* TIMING...From noon Saturday to midnight MDT Saturday night.

* THUNDERSTORMS...Scattered coverage with abundant lightning.

* OUTFLOW WINDS...Gusty erratic winds up to 50 mph.

* IMPACTS...Any fire that develops will catch and spread
  quickly. Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will occur shortly.

&&

$$
W