FNUS75 KBOI 271041

FWSBOI



Spot Forecast for CZ Piles...USFS

National Weather Service Boise ID

441 AM MDT Mon Oct 27 2025



Forecast is based on ignition time of 0721 MDT on October 27. 

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.



...DRYING UNDER INCOMING UPPER LEVEL HIGH PRESSURE...



.DISCUSSION...

A few lingering flurries or sprinkles today then no more rain/snow

this week as high pressure aloft comes inland from the Pacific with

drier weather, except for morning fog.  However, the ridge will 

also bring faster warming aloft than in the valleys beginning

Tuesday, causing a mild inversion and limiting mixing and ventilation

near ground level.  Morning fog may be slower to clear Tuesday.



.REST OF TODAY...



Sky/weather.........Patchy fog in the morning. Partly sunny with 

                    isolated snow and/or rain showers. Chance of 

                    precipitation 20 percent. 

Max temperature.....36 to 41. 

Min humidity........62 to 67 percent. 

CWR.................10 percent. 

Wind - 20 foot......Southwest around 4 mph. 

Mixing height.......4500 ft AGL. 

Transport winds.....Southwest around 10 mph. 

Ventilation Index...450 fair. 



.TONIGHT...



Sky/weather.........Mostly cloudy in the evening, then clearing. 

Min temperature.....18 to 23. 

Max humidity........92 to 97 percent. 

CWR.................0 percent. 

Wind - 20 foot......Less than 3 mph. 

Mixing height.......400 ft AGL. 

Transport winds.....Southeast around 5 mph. 

Ventilation Index...20 poor. 



.TUESDAY...



Sky/weather.........Patchy fog in the morning. Mostly sunny. 

Max temperature.....43 to 48. 

Min humidity........48 to 53 percent. 

CWR.................0 percent. 

Wind - 20 foot......South up to 5 mph. Gusts up to 14 mph in the 

                    afternoon. 

Mixing height.......3000 ft AGL. 

Transport winds.....South around 15 mph. 

Ventilation Index...450 fair. 



$$

Forecaster...Colin

Requested by...Jonathan Miller

Type of request...PRESCRIBED

.TAG 2524156.4/BOI

.DELDT 10/27/25

.FormatterVersion 2.0.0

.EMAIL jonathan.miller@usda.gov