846
FNUS75 KBOI 190720
FWSBOI

Spot Forecast for Lake Fire...USFS
National Weather Service Boise ID
120 AM MDT Wed Aug 19 2026

Forecast is based on forecast start time of 0600 MDT on August 19.
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.

...DRY AND WARMER THROUGH THURSDAY...
...SLIGHT CHANCE OF THUNDERSTORMS FRIDAY...

.DISCUSSION...
High pressure will bring warm and dry conditions to the fire site
today and Thursday. Temperatures will be well above normal with
humidity dropping below 20% each afternoon. Increasing moisture
aloft will bring a 20% chance of thunderstorms Friday and a 30%
chance on Saturday. Little if any rainfall is expected from
thunderstorms both days and storms will be capable of producing
gusty outflow winds. Winds will ramp up from the southwest each
afternoon.

.TODAY...

Sky/weather.........Mostly sunny.
Max temperature.....71 to 76.
Min humidity........14 to 19 percent.
CWR.................0 percent.
Wind - 20 foot......Southwest 3 to 6 mph, becoming west 6 to 10 mph
                    with gusts up to 16 mph in the afternoon.
Mixing height.......7500 ft AGL.
Transport winds.....West around 10 mph.
Ventilation Index...750 excellent.

.TONIGHT...

Sky/weather.........Mostly clear.
Min temperature.....53 to 58.
Max humidity........34 to 39 percent.
CWR.................0 percent.
Wind - 20 foot......Northwest 3 to 6 mph in the evening shifting to
                    the southeast 3 to 5 mph overnight.
Mixing height.......200 ft AGL.
Transport winds.....Southeast around 5 mph.
Ventilation Index...10 poor.

.THURSDAY...

Sky/weather.........Sunny.
Max temperature.....77 to 82.
Min humidity........14 to 19 percent.
CWR.................0 percent.
Wind - 20 foot......Southeast 3 to 5 mph in the morning, becoming
                    southwest 7 to 11 mph. Gusts up to 20 mph in the
                    afternoon.
Mixing height.......9500 ft AGL.
Transport winds.....Southwest around 15 mph.
Ventilation Index...1425 excellent.

$$
Forecaster...Groenert
Requested by...Justin Aleshire
Type of request...WILDFIRE
.TAG 2619812.2/BOI
.DELDT 08/19/26
.FormatterVersion 2.0.0
.EMAIL justin.aleshire@usda.gov