437
FNUS75 KBOI 181604
FWSBOI

Spot Forecast for Gerdie Fire...BOI
National Weather Service Boise ID
1004 AM MDT Tue Aug 18 2026

Forecast is based on forecast start time of 1000 MDT 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.

...WARM AND DRY WITH LIGHT TERRAIN DRIVEN WINDS THROUGH FRIDAY MORNING...

.DISCUSSION...
High clouds will continue to decrease throughout the day today,
with mostly clear skies by the afternoon. High pressure will bring
a steady warming and drying trend through the next several days.
Relative humidity recoveries overnight will be poor, especially at
higher elevations. The next chance of showers and thunderstorms
will occur with a cold front on Friday evening.

.REST OF TODAY...

Sky/weather.........Partly sunny.
Max temperature.....80 to 85.
Min humidity........15 to 20 percent.
CWR.................0 percent.
Wind - 20 foot......Northeast 5 to 10 mph. Gusts up to 20 mph in the
                    afternoon.
Mixing height.......10000 ft AGL.
Transport winds.....West around 10 mph.
Ventilation Index...1000 excellent.

.TONIGHT...

Sky/weather.........Mostly clear.
Min temperature.....62 to 67.
Max humidity........29 to 34 percent.
CWR.................0 percent.
Wind - 20 foot......Northwest 3 to 9 mph. Gusts up to 18 mph in the
                    evening.
Mixing height.......400 ft AGL.
Transport winds.....Northwest around 5 mph.
Ventilation Index...20 poor.

.WEDNESDAY...

Sky/weather.........Partly sunny.
Max temperature.....81 to 88.
Min humidity........13 to 18 percent.
CWR.................0 percent.
Wind - 20 foot......Northwest 3 to 5 mph in the morning shifting to
                    the northeast around 7 mph with gusts to around
                    16 mph in the afternoon.
Mixing height.......7000 ft AGL.
Transport winds.....Southwest around 10 mph.
Ventilation Index...700 excellent.

$$
Forecaster...Adams
Requested by...Max Maeda (IC)
Type of request...WILDFIRE
.TAG 2619958.0/BOI
.DELDT 08/18/26
.FormatterVersion 2.0.0
.EMAIL max.s.maeda@gmail.com