573
FNUS75 KBOI 041333
FWSBOI

Spot Forecast for Lost Horse...USFS
National Weather Service Boise ID
633 AM MST Wed Nov 4 2026

Forecast is based on ignition time of 0900 MST on November 04.
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.

...POOR VENTILATION THIS WEEK...
...DRY EXCEPT FOR ISOLATED SHOWERS ON THURSDAY...

.DISCUSSION...
High pressure will remain overhead today. This will keep winds
light with low vertical mixing, leading to poor ventilation.
Skies will become mostly sunny this afternoon with light winds.
Temperatures will be slightly above normal today. A weak system
will move through on Thursday, bringing a 20% chance of a
rain/snow mix and cooler temperatures. High pressure will rebuild
Friday through the weekend with dry conditions and temperatures
warming to around 10 degrees above normal.

.TODAY...

Sky/weather.........Sunny.
Max temperature.....43 to 48.
Min humidity........42 to 49 percent.
CWR.................0 percent.
Wind - 20 foot......Northeast 1 to 3 mph in the morning, becoming
                    west to southwest 2 to 4 mph in the afternoon.
Mixing height.......3000 ft AGL.
Transport winds.....West around 5 mph.
Ventilation Index...150 poor.

.TONIGHT...

Sky/weather.........Partly cloudy in the evening, then mostly
                    cloudy with a 20 percent chance of rain and
                    snow showers overnight.
Min temperature.....30 to 35.
Max humidity........75 to 90 percent.
CWR.................5 percent.
Wind - 20 foot......Downslope less than 3 mph, except south to
                    southeast 1 to 3 mph on ridgelines.
Mixing height.......100 ft AGL.
Transport winds.....South around 5 mph.
Ventilation Index...5 poor.

.THURSDAY...

Sky/weather.........Mostly cloudy. A 20 percent chance of rain and
                    snow showers.
Max temperature.....37 to 42.
Min humidity........63 to 68 percent.
CWR.................5 percent.
Wind - 20 foot......Downslope less than 3 mph except south 1 to 3
                    mph on ridgelines in the morning, becoming
                    west to southwest 2 to 4 mph in the afternoon.
Mixing height.......2500 ft AGL.
Transport winds.....West around 5 mph.
Ventilation Index...125 poor.

$$
Forecaster...Tangen
Requested by...Wynkoop
Type of request...PRESCRIBED
.TAG 2624758.3/BOI
.DELDT 11/04/26
.FormatterVersion 2.0.0
.EMAIL michael.wynkoop@usda.gov,matthew.haupt@usda.gov,lucarelli.julian@gmail.com,steven.hlawatschek@usda.gov