135
FNUS75 KBOI 172026
FWSBOI

Spot Forecast for Second Flat Coleman Creek Jackass Butte and...DOI
National Weather Service Boise ID
226 PM MDT Mon Aug 17 2026

Forecast is based on forecast start time of 0700 PDT on August 18.
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.

...WARMING AND DRYING TREND WITH LIGHT TERRAIN DRIVEN WINDS
THROUGH THURSDAY...

.DISCUSSION...
Cloud cover will decrease tonight, with high pressure building
back into the region starting Tuesday. Warm and dry conditions
with light, terrain driven winds will dominate the weather through
Friday. Overnight relative humidity recoveries will be poor to
moderate, especially at higher elevations. Ridgetop winds will be
strongest each day, with gusts up to 25 mph in the afternoon.

.TUESDAY...

Sky/weather.........Partly sunny.
Max temperature.....75 to 90.
Min humidity........10 to 20 percent.
CWR.................0 percent.
Wind - 20 foot......West 4 to 10 mph. Gusts up to 18 mph in the
                    afternoon.
Mixing height.......10500 ft AGL.
Transport winds.....West around 10 mph.
Ventilation Index...1050 excellent.

.TUESDAY NIGHT...

Sky/weather.........Partly cloudy.
Min temperature.....49 to 64.
Max humidity........27 to 42 percent.
CWR.................0 percent.
Wind - 20 foot......Northwest 4 to 10 mph with gusts to around 18
                    mph.
Mixing height.......200 ft AGL.
Transport winds.....North around 5 mph.
Ventilation Index...10 poor.

.WEDNESDAY...

Sky/weather.........Mostly cloudy in the morning, then clearing.
Max temperature.....77 to 92.
Min humidity........10 to 20 percent.
CWR.................0 percent.
Wind - 20 foot......Northwest up to 6 mph in the morning shifting
                    to the southeast 3 to 7 mph with gusts to
                    around 16 mph in the afternoon.
Mixing height.......9000 ft AGL.
Transport winds.....Southwest around 5 mph.
Ventilation Index...450 fair.

$$
Forecaster...Adams
Requested by...Travis Clapp
Type of request...WILDFIRE
.TAG 2619868.0/BOI
.DELDT 08/18/26
.FormatterVersion 2.0.0
.EMAIL travis_clapp@ios.doi.gov