261
FNUS75 KBOI 211112
FWSBOI

Spot Forecast for Grizzly Fire...USFS
National Weather Service Boise ID
512 AM MDT Tue Jul 21 2026

Forecast is based on forecast start time of 0600 MDT on July 21.
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.

...ISOLATED TO SCATTERED SHOWERS/THUNDERSTORMS TODAY AND WEDNESDAY...
...HOT THROUGH THE WEEK...
...DRY AND BREEZY STARTING FRIDAY...

.DISCUSSION...
It will be mostly cloudy today with a 20% chance of showers and
thunderstorms this afternoon into tonight. It will still be hot,
but increasing monsoonal moisture should keep relative humidity
above 25 percent this afternoon. Winds will be light out of the
north today, except for outflow gusts from any nearby
thunderstorms. Shower and thunderstorm chances increase on
Wednesday with heavy rain and gusty winds possible from storms.
Outside of storms, a ridge of high pressure will keep winds
relatively light through Thursday. Hot, dry, and breezy conditions
will return starting Friday and continuing into the weekend as
the ridge breaks down.

.TODAY...

Sky/weather.........Mostly cloudy. A 20 percent chance of showers
                    and thunderstorms in the afternoon.
Max temperature.....90 to 96.
Min humidity........25 to 30 percent.
CWR.................10 percent.
Wind - 20 foot......Terrain-driven winds 2 to 4 mph in the morning,
                    becoming north 4 to 8 mph in the afternoon.
                    Gusty and erratic winds expected near
                    thunderstorms in the afternoon.

.TONIGHT...

Sky/weather.........Mostly cloudy. A slight chance of showers and
                    thunderstorms in the evening, then a slight
                    chance of rain overnight. Chance of
                    precipitation 20 percent.
Min temperature.....67 to 72.
Max humidity........54 to 59 percent.
CWR.................10 percent.
Wind - 20 foot......Northeast 4 to 8 mph in the evening, becoming
                    downslope 2 to 4 mph after midnight. Gusty and
                    erratic winds expected near thunderstorms in the
                    evening.

.WEDNESDAY...

Sky/weather.........Partly sunny. A slight chance of rain in the
                    morning, then a chance of showers and
                    thunderstorms in the afternoon. Chance of
                    precipitation 40 percent.
Max temperature.....86 to 92.
Min humidity........30 to 35 percent.
CWR.................10 percent.
Wind - 20 foot......Terrain-driven winds 2 to 4 mph in the morning,
                    becoming north 4 to 7 mph in the afternoon. Gusty
                    and erratic winds expected near thunderstorms
                    in the afternoon.

$$
Forecaster...Tangen
Requested by...Payette Dispatch
Type of request...WILDFIRE
.TAG 2617766.1/BOI
.DELDT 07/21/26
.FormatterVersion 2.0.0
.EMAIL idpac@firenet.gov