502
FNUS75 KBOI 281944
FWSBOI

Spot Forecast for Box...BLM
National Weather Service Boise ID
144 PM MDT Thu Aug 28 2025

Forecast is based on forecast start time of 0600 MDT on August 29.
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.

...MOISTURE LEAVING BUT ISOLATED STORMS REMAIN THROUGH FRIDAY...
...SUNNY AND DRY FROM SATURDAY WITH BREEZY EVENINGS...

.DISCUSSION...
Monsoonal moisture is moving away with a rapidly drying and warming
trend into the early week. Due to the drier air, there is a decreased
chance of thunderstorms and showers compared to the previous days,
however isolated thunderstorms are still expected during the afternoon
and evening through Friday. Gusty outflows to 45 mph are possible
in thunderstorms, with directions most likely from the south or west.
Light winds otherwise, most likely diurnally forced with upslope flow
during the day and downslope during the night through Saturday.

.EXTENDED FORECAST THROUGH SUNDAY...
Sunny and dry conditions returning from Saturday. Expect
temperatures to increase to around 90F and RH decreasing to just
under 20% by Sunday. Winds on Sunday increasing slightly with
southeast flow around 10 mph, shifting more easterly 13 mph with
breezy gusts to 20 mph in the evening. This drier and warmer trend
is expected to continue through early next week.


.FRIDAY...

Sky/weather.........Mostly sunny. A 20 percent chance of showers
                    and thunderstorms in the afternoon.
Max temperature.....82 to 87.
Min humidity........22 to 27 percent.
CWR.................10 percent.
Wind - 20 foot......Southeast around 6 mph in the morning shifting
                    to the northeast in the afternoon. Gusty and
                    erratic winds expected near thunderstorms in
                    the afternoon.
Mixing height.......12000 ft AGL.
Transport winds.....North around 5 mph.
Ventilation Index...600 good.

.FRIDAY NIGHT...

Sky/weather.........Mostly clear. A 20 percent chance of showers
                    and thunderstorms in the evening.
Min temperature.....58 to 63.
Max humidity........53 to 58 percent.
CWR.................0 percent.
Wind - 20 foot......Southeast around 6 mph. Gusty and erratic winds
                    expected near thunderstorms in the evening.
Mixing height.......200 ft AGL.
Transport winds.....Southeast around 10 mph.
Ventilation Index...20 poor.

.SATURDAY...

Sky/weather.........Sunny.
Max temperature.....85 to 90.
Min humidity........18 to 23 percent.
CWR.................0 percent.
Wind - 20 foot......Southeast around 6 mph.
Mixing height.......12500 ft AGL.
Transport winds.....South around 10 mph.
Ventilation Index...1250 excellent.

$$
Forecaster...Zhou
Requested by...Idaho Team 1
Type of request...WILDFIRE
.TAG 2520906.0/BOI
.DELDT 08/29/25
.FormatterVersion 2.0.0
.EMAIL 2025.box.plans@firenet.gov