405
FNUS75 KBOI 091008
FWSBOI

Spot Forecast for Johnson Fork Piles...USFS
National Weather Service Boise ID
308 AM MST Sat Nov 9 2024

Forecast is based on ignition time of 0900 MST on November 09.
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.

...VALLEY INVERSION UNDER HIGH PRESSURE ALOFT TODAY...
...COLDER AND WETTER CONDITIONS SUNDAY THROUGH TUESDAY...

.DISCUSSION...
High pressure aloft today will continue the warming above the cold
valleys, resulting in an inversion with poor mixing and ventilation.
Mixing heights, at best, are forecast to reach about 2000 feet AGL today.
Winds will also be very light, and no rain is expected until early Sunday
morning at the earliest, though it`s unlikely to be wetting rain. Still
on track for a stronger trough Monday evening for widespread precipitation.
There is about a 70% chance of 0.50" or more of rain at the burn site.

.REST OF TODAY...

Sky/weather.........Mostly sunny.
Max temperature.....46 to 51.
Min humidity........41 to 46 percent.
CWR.................0 percent.
LAL.................1.
Wind - 20 foot......Less than 3 mph late in the morning becoming
                    south around 3 mph in the afternoon.
Mixing height.......2000 ft AGL.
Transport winds.....South around 5 mph.
Haines Index........3 very low.
Ventilation Index...100 poor.

.TONIGHT...

Sky/weather.........Mostly cloudy. A 30 percent chance of rain
                    showers overnight.
Min temperature.....31 to 36.
Max humidity........80 to 85 percent.
CWR.................0 percent.
LAL.................1.
Wind - 20 foot......Less than 3 mph.
Mixing height.......400 ft AGL.
Transport winds.....South around 0 mph.
Haines Index........3 very low.
Ventilation Index...0 poor.

.SUNDAY...

Sky/weather.........Mostly cloudy. A 30 percent chance of rain
                    showers in the morning.
Max temperature.....50 to 55.
Min humidity........49 to 54 percent.
CWR.................10 percent.
LAL.................1.
Wind - 20 foot......Less than 3 mph.
Mixing height.......3000 ft AGL.
Transport winds.....West around 5 mph.
Haines Index........2 very low.
Ventilation Index...150 poor.

$$
Forecaster...Smith
Requested by...N. Becharas
Type of request...PRESCRIBED
.TAG 2426145.0/BOI
.DELDT 11/09/24
.FormatterVersion 2.0.0
.EMAIL j.dorman@usda.gov,nicholas.becharas@usda.gov