317
FNUS75 KBOI 192232
FWSBOI

Spot Forecast for Second Flat Coleman Creek Jackass Butte and...DOI
National Weather Service Boise ID
432 PM MDT Wed Aug 19 2026

Forecast is based on forecast start time of 0700 PDT on August 20.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office at (208)334-9060, if you have questions
or concerns with this forecast.

...WARM AND DRY THROUGH FRIDAY MORNING...
...BREEZY WINDS WITH INCREASING CHANCES OF SHOWERS AND THUNDERSTORMS
FRIDAY EVENING AND SATURDAY...

.DISCUSSION...
High pressure remains the dominate feature across the region
bringing a steady warming and drying trend through Friday morning.
Light and terrain driven winds with poor overnight relative
humidity recoveries at higher elevations through will occur
through Friday. Increase mid to high level moisture should
increase cloud cover Thursday afternoon and that could limit high
temperatures.

Upper level trough approaching from the west will continue a
steady stream of clouds across southeast Oregon. This will bring
breezy southerly winds with very hot and dry conditions, with a
low chance (10%) of showers and thunderstorms later that evening.
Greater winds are possible on Saturday from the south-southwest
with RHs in the teens that would be impactful to all fires.

.THURSDAY...

Sky/weather.........Mostly sunny.
Max temperature.....87 to 97.
Min humidity........8 to 18 percent.
CWR.................0 percent.
Wind - 20 foot......Southwest 6 to 12 mph with gusts to around 20
                    mph.
Mixing height.......8000 ft AGL.
Transport winds.....Southwest around 15 mph.
Ventilation Index...1200 excellent.

.THURSDAY NIGHT...

Sky/weather.........Cloudy.
Min temperature.....58 to 68.
Max humidity........25 to 35 percent.
CWR.................0 percent.
Wind - 20 foot......Northwest 6 to 12 mph. Gusts up to 22 mph in
                    the evening.
Mixing height.......200 ft AGL.
Transport winds.....Northeast around 5 mph.
Ventilation Index...10 poor.

.FRIDAY...

Sky/weather.........Cloudy.
Max temperature.....86 to 96.
Min humidity........9 to 19 percent.
CWR.................0 percent.
Wind - 20 foot......North 3 to 9 mph in the morning shifting to the
                    south 4 to 10 mph with gusts to around 18 mph
                    in the afternoon.
Mixing height.......9500 ft AGL.
Transport winds.....Southwest around 10 mph.
Ventilation Index...950 excellent.

$$
Forecaster...Smith
Requested by...Travis Clapp
Type of request...WILDFIRE
.TAG 2620033.0/BOI
.DELDT 08/20/26
.FormatterVersion 2.0.0
.EMAIL travis_clapp@ios.doi.gov