471
FNUS75 KBOI 221248
FWSBOI

Spot Forecast for Lake Fire...USFS
National Weather Service Boise ID
648 AM MDT Sat Aug 22 2026

Forecast is based on forecast start time of 0600 MDT on August 22.
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.

...RED FLAG WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO
MIDNIGHT MDT TONIGHT...

.DISCUSSION...
Unstable conditions today ahead of a cold front. Scattered
thunderstorms possible this afternoon ahead of a cold front, with
gusty erratic outflow winds up to 50 mph possible. Drier air moves
into the area on Sunday with dry conditions and westerly flow.

.TODAY...

Sky/weather.........Mostly cloudy. A slight chance of rain in the
                    morning, then a chance of showers and
                    thunderstorms in the afternoon. Some
                    thunderstorms may produce gusty winds in the
                    afternoon. Chance of precipitation 30 percent.
Max temperature.....72 to 77.
Min humidity........24 to 30 percent.
CWR.................0 percent.
Wind - 20 foot......Southwest 6 to 12 mph with gusts to around 20
                    mph. Gusty and erratic winds expected near
                    thunderstorms in the afternoon.
Mixing height.......7000 ft AGL.
Transport winds.....Southwest around 20 mph.
Ventilation Index...1400 excellent.

.TONIGHT...

Sky/weather.........Partly cloudy with a slight chance of showers.
                    A slight chance of thunderstorms. Some
                    thunderstorms may produce gusty winds in the
                    evening. Chance of precipitation 20 percent.
Min temperature.....50 to 55.
Max humidity........64 to 69 percent.
CWR.................0 percent.
Wind - 20 foot......Southwest 6 to 12 mph with gusts to around 20
                    mph. Gusty and erratic winds expected near
                    thunderstorms in the evening. Gusty and erratic
                    winds expected near thunderstorms overnight.
Mixing height.......300 ft AGL.
Transport winds.....South around 5 mph.
Ventilation Index...15 poor.

.SUNDAY...

Sky/weather.........Sunny.
Max temperature.....66 to 71.
Min humidity........18 to 23 percent.
CWR.................0 percent.
Wind - 20 foot......Southwest 3 to 9 mph with gusts to around 18
                    mph in the morning increasing to around 13 mph
                    with gusts to around 24 mph in the afternoon.
Mixing height.......7500 ft AGL.
Transport winds.....Southwest around 15 mph.
Ventilation Index...1125 excellent.

$$
Forecaster...Anderson
Requested by...Justin Aleshire
Type of request...WILDFIRE
.TAG 2619812.5/BOI
.DELDT 08/22/26
.FormatterVersion 2.0.0
.EMAIL justin.aleshire@usda.gov