174
FNUS75 KBOI 130720
FWSBOI

Spot Forecast for Lake Fire...USFS
National Weather Service Boise ID
120 AM MDT Thu Aug 13 2026

Forecast is based on forecast start time of 0600 MDT on August 13.
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 FOR SCATTERED LIGHTNING IN EFFECT FROM 3 PM
THIS AFTERNOON TO 6 AM MDT FRIDAY...
...INCREASING SHOWERS AND THUNDERSTORMS THURSDAY AFTERNOON, CONTINUING FRIDAY...

.DISCUSSION...
Isolated showers will develop this morning with a 15% chance of
showers near the fire. This afternoon, shower and thunderstorm
coverage will increase, with 35% chance of showers and a 25%
chance of thunderstorms. Thunderstorms this afternoon will be dry
in nature, capable of lightning and wind gusts up to 35 mph.
Showers will continue to increase overnight, with a slight chance
of thunderstorms continuing overnight tonight. Showers and
scattered thunderstorms will continue Friday afternoon, with heavy
rain becoming more of a hazard.

.TODAY...

Sky/weather.........Partly sunny. Isolated showers in the morning,
                    then scattered showers and thunderstorms in the
                    afternoon. Some thunderstorms may produce gusty
                    winds in the afternoon. Chance of precipitation
                    30 percent.
Max temperature.....66 to 71.
Min humidity........36 to 41 percent.
CWR.................10 percent.
Wind - 20 foot......Upslope around 3 mph in the morning. Becoming
                    west 6 to 10 mph with gusts up to 18 mph in the
                    afternoon. Gusty and erratic winds expected near
                    thunderstorms in the afternoon.
Mixing height.......6500 ft AGL.
Transport winds.....West around 10 mph.
Ventilation Index...650 good.

.TONIGHT...

Sky/weather.........Mostly cloudy with a chance of showers and
                    thunderstorms in the evening. Then showers
                    likely and a slight chance of thunderstorms
                    overnight. Some thunderstorms may produce
                    gusty winds. Chance of precipitation 70
                    percent.
Min temperature.....47 to 52.
Max humidity........80 to 85 percent.
CWR.................20 percent.
Wind - 20 foot......Northwest 6 to 12 mph in the evening. Becoming
                    downslope 3 to 5 mph overnight. Gusty and
                    erratic winds expected near thunderstorms.
Mixing height.......200 ft AGL.
Transport winds.....South around 5 mph.
Ventilation Index...10 poor.

.FRIDAY...

Sky/weather.........Cloudy. A chance of showers and thunderstorms
                    in the morning, then 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.....62 to 67.
Min humidity........56 to 61 percent.
CWR.................50 percent.
Wind - 20 foot......Upslope 3 to 6 mph in the morning. Becoming southwest
                    4 to 8 mph with gusts to around 15 mph in the afternoon.
                    Gusty and erratic winds expected near thunderstorms.
Mixing height.......5500 ft AGL.
Transport winds.....West around 10 mph.
Ventilation Index...550 good.

$$
Forecaster...Francis
Requested by...IC
Type of request...WILDFIRE
.TAG 2619115.7/BOI
.DELDT 08/13/26
.FormatterVersion 2.0.0
.EMAIL idpac@firenet.gov