956
FNUS75 KBOI 221039
FWSBOI

Spot Forecast for West Castle Rock RX...Vale BLM
National Weather Service Boise ID
339 AM MST Sat Nov 22 2025

Forecast is based on ignition time of 0700 MST on November 22.
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.

...DRY AND STABLE WITH INVERSION IN PLACE...

.DISCUSSION...
Dry and stable conditions expect through Sunday night under
a weak upper level ridge. Valley fog/stratus will be
persistent especially Saturday and Sunday. This will also keep
poor mixing and ventilation with mixing heights between 1000
and 1500 feet AGL. A cold front Sunday evening into Monday should be
strong enough to break the inversion as well as bring light
rain/snow showers.

.REST OF TODAY...

Sky/weather.........Mostly sunny.
Max temperature.....41 to 46.
Min humidity........63 to 78 percent.
CWR.................0 percent.
Wind - 20 foot......Southeast around 5 mph.
Mixing height.......1000 ft AGL.
Transport winds.....South around 5 mph.
Ventilation Index...50 poor.

.TONIGHT...

Sky/weather.........Partly cloudy.
Min temperature.....28 to 33.
Max humidity........78 to 84 percent.
CWR.................0 percent.
Wind - 20 foot......Southeast around 4 mph.
Mixing height.......200 ft AGL.
Transport winds.....Southwest around 0 mph.
Ventilation Index...0 poor.

.SUNDAY...

Sky/weather.........Partly sunny. A 40 percent chance of rain and
                    snow showers in the afternoon.
Max temperature.....39 to 46.
Min humidity........59 to 69 percent.
CWR.................0 percent.
Wind - 20 foot......South up to 5 mph.
Mixing height.......1500 ft AGL.
Transport winds.....Southwest around 10 mph.
Ventilation Index...150 poor.

$$
Forecaster...Smith
Requested by...Vale Dispatch
Type of request...PRESCRIBED
.TAG 2526427.2/BOI
.DELDT 11/22/25
.FormatterVersion 2.0.0
.EMAIL orvac@firenet.gov