647
FNUS75 KBOI 190922
FWSBOI

Spot Forecast for Fox...FS
National Weather Service Boise ID
322 AM MDT Wed Aug 19 2026

Forecast is based on forecast start time of 0800 MDT on August 19.
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 HOTTER THROUGH FRIDAY...
...GUSTY WINDS AND A SLIGHT CHANCE OF THUNDERSTORMS SATURDAY...

.DISCUSSION...
High pressure will bring hot and dry conditions to the fire site
through Friday. Temperatures will be well above normal with humidity
dropping below 15% each afternoon. Increasing moisture aloft will
bring a 20% chance of thunderstorms on Saturday, followed by a cold
frontal passage Saturday evening. Little if any rainfall is expected
from thunderstorms on Saturday and storms will be capable of
producing gusty outflow winds. General winds will follow a diurnal
cycle through Friday. Stronger southwest winds will develop on Saturday
with gusts to 30 mph possible.

.TODAY...

Sky/weather.........Mostly sunny.
Max temperature.....87 to 94.
Min humidity........8 to 14 percent.
CWR.................0 percent.
Wind - 20 foot......Northwest 3 to 5 mph, becoming northeast
                    4 to 8 mph in the afternoon.
Mixing height.......7500 ft AGL.
Transport winds.....West around 5 mph.
Ventilation Index...375 fair.

.TONIGHT...

Sky/weather.........Mostly clear.
Min temperature.....63 to 69.
Max humidity........24 to 29 percent.
CWR.................0 percent.
Wind - 20 foot......Northeast 3 to 6 mph in the evening, becoming
                    northwest 5 to 9 mph overnight.
Mixing height.......100 ft AGL.
Transport winds.....North around 5 mph.
Ventilation Index...5 poor.

.THURSDAY...

Sky/weather.........Sunny.
Max temperature.....93 to 100.
Min humidity........8 to 14 percent.
CWR.................0 percent.
Wind - 20 foot......Northwest 3 to 6 mph in the morning becoming
                    southwest 6 to 10 mph with gusts to 15 mph in the
                    afternoon.
Mixing height.......10000 ft AGL.
Transport winds.....Southwest around 10 mph.
Ventilation Index...1000 excellent.

$$
Forecaster...Groenert
Requested by...Cody Collins
Type of request...WILDFIRE
.TAG 2619441.8/BOI
.DELDT 08/19/26
.FormatterVersion 2.0.0
.EMAIL cscollins@blm.gov,danielsmith@blm.gov