366
FNUS75 KBOI 221939
FWSBOI

Spot Forecast for Box...BLM
National Weather Service Boise ID
139 PM MDT Fri Aug 22 2025

Forecast is based on forecast start time of 0600 MDT on August 23.
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, DRY AND UNSTABLE WITH THUNDERSTORM OUTFLOWS ON SATURDAY...

...WARM AND SLIGHTLY MOISTER WITH INCREASED CHANCE OF
THUNDERSTORMS SUNDAY...

.DISCUSSION...
Very hot, dry and unstable conditions on Saturday, with mixing
heights in excess of 13000 ft which may lead to enhanced
convective plume development. Winds generally light in the absence
of thunderstorms, and are likely to be diurnally dominated with
local upslope flows after 0900 MDT and downslope after 2000. While
there is a slight chance of thunderstorms forming to the west and
south Saturday afternoon and evening, they are expected to remain
well away from the fire. However, associated outflows could lead
to erratic winds and gusts up to 40 mph reaching the fire from the
late afternoon, most likely from a southerly or westerly
direction. Thunderstorms may continue through the overnight period
and increase again with showers during Sunday morning. Poor RH
recoveries overnight. Smoke may concentrate in local valleys
overnight beneath an inversion.


.SATURDAY...

Sky/weather.........Partly sunny.
Max temperature.....94 to 99.
Min humidity........13 to 18 percent.
CWR.................0 percent.
Wind - 20 foot......Northeast around 10 mph. Gusts up to 20 mph in the
                    afternoon.
Mixing height.......13000 ft AGL.
Transport winds.....West around 10 mph.
Ventilation Index...1300 excellent.

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy. A 10% chance of thunderstorms
                    with little rainfall in the evening and continuing
                    overnight.
Max humidity........30 to 35 percent.
CWR.................0 percent.
Wind - 20 foot......Northeast shifting southwest around 5 mph. Gusts up to
                    10-15 mph in the evening. Gusty and
                    erratic winds possible near thunderstorms in
                    the evening.
Mixing height.......300 ft AGL.
Transport winds.....East around 10 mph.
Ventilation Index...30 poor.

.SUNDAY...

Sky/weather.........Cloudy. A slight chance of showers in the
                    morning, then a chance of showers and a slight
                    chance of thunderstorms in the afternoon.
                    Chance of precipitation 30 percent.
Max temperature.....86 to 91.
Min humidity........23 to 28 percent.
CWR.................10 percent.
Wind - 20 foot......Southeast around 5 mph in the morning shifting
                    west around 7 mph with gusts to
                    around 20 mph in the afternoon. Gusty and
                    erratic winds expected near thunderstorms in
                    the afternoon.
Mixing height.......8500 ft AGL.
Transport winds.....Northwest around 10 mph.
Ventilation Index...850 excellent.

$$
Forecaster...Zhou
Requested by...Idaho Team 1
Type of request...WILDFIRE
.TAG 2520459.0/BOI
.DELDT 08/23/25
.FormatterVersion 2.0.0
.EMAIL 2025.box.plans@firenet.gov