421 
FNUS75 KBOI 280750
FWSBOI

Spot Forecast for Cold RX...USFS
National Weather Service Boise ID
150 AM MDT Sun Sep 28 2025

Forecast is based on ignition time of 0600 MDT on September 28. 
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.

...WIDESPREAD PRECIPITATION MONDAY MORNING THROUGH THE WEEK...
...PEAK RAINFALL MONDAY NIGHT THROUGH TUESDAY MORNING...
...WINDS INCREASE TUESDAY AFTERNOON...

.DISCUSSION...
Mostly warm and dry today, precipitation arrives Monday morning. 
The core of the moisture plume arrives Monday night through 
Tuesday morning, with CWRs near 70% both Monday night and Tuesday.
Total rainfall accumulation forecast during this time is 0.5". 
Winds Sunday and Monday are fairly light, while gusts up to 18 mph
become possible Tuesday and Wednesday afternoons, mostly along 
ridgetops. Thunderstorms embedded in the showers are possible, 
which could produce locally heavy rainfall rates. Marginal risk 
for flash flooding due to excessive rainfall, especially on higher
intensity burn scars.

.TODAY...

Sky/weather.........Sunny. 
Max temperature.....72 to 77. 
Min humidity........20 to 25 percent. 
CWR.................0 percent. 
Wind - 20 foot......Northeast 3 to 5 mph in the morning shifting to 
                    the south around 5 mph in the afternoon. 
Mixing height.......3500 ft AGL. 
Transport winds.....South around 15 mph. 
Ventilation Index...525 good. 

.TONIGHT...

Sky/weather.........Partly cloudy. 
Min temperature.....47 to 52. 
Max humidity........57 to 62 percent. 
CWR.................0 percent. 
Wind - 20 foot......South around 5 mph. 
Mixing height.......200 ft AGL. 
Transport winds.....Southeast around 5 mph. 
Ventilation Index...10 poor. 

.MONDAY...

Sky/weather.........Mostly cloudy. A chance of showers, mainly in 
                    the afternoon. Chance of showers 40 percent. 
Max temperature.....63 to 68. 
Min humidity........57 to 62 percent. 
CWR.................20 percent. 
Wind - 20 foot......South 3 to 6 mph. 
Mixing height.......3000 ft AGL. 
Transport winds.....South around 15 mph. 
Ventilation Index...450 fair. 

$$
Forecaster...Macfarlane
Requested by...Nathan Robinson
Type of request...PRESCRIBED
.TAG 2522622.1/BOI
.DELDT 09/28/25
.FormatterVersion 2.0.0
.EMAIL nathan.robinson@usda.gov