173
FNUS75 KBOI 010926
FWSBOI

Spot Forecast for Sliver...USFS
National Weather Service Boise ID
326 AM MDT Tue Sep 1 2026

Forecast is based on forecast start time of 0600 MDT on September 01.
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.

...CHANCE FOR THUNDERSTORMS TUESDAY AFTERNOON...
...PERIODS OF RAIN AND THUNDERSTORMS THROUGH FRIDAY...

.DISCUSSION...
A weak system passage today should for a chance of showers and
thunderstorms this afternoon. Thunderstorms look to initiate
around 2 PM MDT and could affect the fire through at least 7 PM.
Thunderstorms could produce gusty winds and brief heavy rainfall.
A brief break in the precipitation this evening with a chance for
more showers and thunderstorms early Wednesday afternoon. There is
about a 30 percent chance of wetting rain. Thursday could see the
most amount rain on the fire as the low stalls just west of Idaho.
RHs should steadily increase with temperatures falling below normal.

.TODAY...

Sky/weather.........Mostly sunny in the morning, then cloudy with
                    showers likely and a chance of thunderstorms in
                    the afternoon. Some thunderstorms may produce
                    gusty winds in the afternoon. Chance of
                    precipitation 70 percent.
Max temperature.....70 to 76.
Min humidity........21 to 26 percent.
CWR.................20 percent.
Wind - 20 foot......Southeast 4 to 10 mph. Gusts up to 16 mph in
                    the afternoon. Gusty and erratic winds expected
                    near thunderstorms in the afternoon.
Mixing height.......2500 ft AGL.
Transport winds.....South around 15 mph.
Ventilation Index...375 fair.

.TONIGHT...

Sky/weather.........Mostly cloudy. Showers likely and a chance of
                    thunderstorms in the evening, then a chance of
                    showers overnight. Some thunderstorms may
                    produce gusty winds in the evening. Chance of
                    precipitation 70 percent.
Min temperature.....43 to 48.
Max humidity........78 to 84 percent.
CWR.................10 percent.
Wind - 20 foot......East 3 to 6 mph. Gusty and erratic winds
                    expected near thunderstorms in the evening.
Mixing height.......400 ft AGL.
Transport winds.....Southeast around 5 mph.
Ventilation Index...20 poor.

.WEDNESDAY...

Sky/weather.........Rain showers and a slight chance of
                    thunderstorms in the morning, then a chance of
                    showers and thunderstorms in the afternoon.
                    Chance of precipitation 90 percent.
Max temperature.....54 to 60.
Min humidity........32 to 37 percent.
CWR.................30 percent.
Wind - 20 foot......Southwest 9 to 15 mph. Gusts up to 14 mph in
                    the morning increasing to 20 mph in the
                    afternoon. Gusty and erratic winds expected
                    near thunderstorms.
Mixing height.......6500 ft AGL.
Transport winds.....Southwest around 20 mph.
Ventilation Index...1300 excellent.

$$
Forecaster...Smith
Requested by...IA Dispatcher
Type of request...WILDFIRE
.TAG 2620758.5/BOI
.DELDT 09/01/26
.FormatterVersion 2.0.0
.EMAIL idpac@firenet.gov