648
FNUS75 KBOI 200226
FWSBOI

Spot Forecast for CROOKED...USFS
National Weather Service Boise ID
826 PM MDT Wed Aug 19 2026

Forecast is based on forecast start time of 0700 MDT on August 20.
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.

...HOT AND DRY INTO FRIDAY...
...SLIGHT CHANCE FOR THUNDERSTORMS FRIDAY AND SATURDAY EVENING...

.DISCUSSION...
Hot and dry through Friday with for poor RH recoveries and light
durinal winds. Winds in the North Fork Boise River valley will
follow a durinal trend of northerly or down valley from sunset
through late morning then switch to southerly or upvalley late
morning through the evening. Ridge tops winds will be light from
the south-southwest. Increasing moisture ahead of a Pacific trough
will allow for increased cloud cover Thursday afternoon and again
on Friday. Temperatures are still expected to reach 8 to 10
degrees above normal. Enough monsoonal moisture should reach south
central Idaho for a 20 percent chances for thundestorms near the
Fire. These storms could produce strong outflow winds. Winds will
be primarily from the south from the valley floor through the
ridgetops Friday afternoon and evening.

.THURSDAY...

Sky/weather.........Sunny.
Max temperature.....90 to 95.
Min humidity........10 to 15 percent.
CWR.................0 percent.
Wind - 20 foot......Northeast 3 to 6 mph in the morning shifting to
                    the south 6 to 9 mph with gusts to around
                    14 mph in the afternoon.
Mixing height.......11500 ft AGL.
Transport winds.....Southwest around 15 mph.
Ventilation Index...1725 excellent.

.THURSDAY NIGHT...

Sky/weather.........Mostly cloudy.
Min temperature.....56 to 61.
Max humidity........33 to 38 percent.
CWR.................0 percent.
Wind - 20 foot......South 6 to 9 mph in the evening switching to the
                    northeast 4 to 8 mph after sunset. Gusts up to 14 mph
                    in the evening.
Mixing height.......200 ft AGL.
Transport winds.....Northeast around 5 mph.
Ventilation Index...10 poor.

.FRIDAY...

Sky/weather.........Partly sunny.
Max temperature.....91 to 96.
Min humidity........11 to 16 percent.
CWR.................0 percent.
Wind - 20 foot......Northeast around 6 mph in the morning shifting to
                    the south 3 to 6 mph in the afternoon.
Mixing height.......14000 ft AGL.
Transport winds.....South around 10 mph.
Ventilation Index...1400 excellent.

$$
Forecaster...Smith
Requested by...BOISE DISPATCH
Type of request...WILDFIRE
.TAG 2620056.0/BOI
.DELDT 08/20/26
.FormatterVersion 2.0.0
.EMAIL IDBDC@FIRENET.GOV,JOY.ABNER@USDA.GOV