524
FNUS75 KBOI 062357
FWSBOI

Spot Forecast for Big Grass...BLM
National Weather Service Boise ID
557 PM MDT Sun Sep 6 2026

Forecast is based on forecast start time of 0500 MDT on September 07.
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 WEATHER THROUGH THE WEEK WITH WARMING TEMPERATURES...

.DISCUSSION...
High pressure aloft will build over the area through midweek. This
will bring a period of dry weather, warmer temperatures. Winds will
be light and follow a general diurnal pattern of westerly during
the day and easterly overnight. Overnight humidity recovery will
gradually decline through Thursday as the air mass warms and drys.

.LABOR DAY...

Sky/weather.........Mostly cloudy in the morning then becoming
                    mostly sunny in the afternoon.
Max temperature.....62 to 68.
Min humidity........29 to 36 percent.
CWR.................0 percent.
Wind - 20 foot......West 3 to 7 mph in the morning, becoming northwest
                    7 to 12 mph.
Mixing height.......5000 ft AGL.
Transport winds.....West around 10 mph.
Ventilation Index...500 good.

.MONDAY NIGHT...

Sky/weather.........Mostly clear.
Min temperature.....39 to 45.
Max humidity........67 to 75 percent.
CWR.................0 percent.
Wind - 20 foot......Northeast 3 to 6 mph.
Mixing height.......100 ft AGL.
Transport winds.....East around 5 mph.
Ventilation Index...5 poor.

.TUESDAY...

Sky/weather.........Sunny.
Max temperature.....73 to 79.
Min humidity........18 to 26 percent.
CWR.................0 percent.
Wind - 20 foot......East up to 6 mph in the morning shifting to the
                    west up to 5 mph in the afternoon.
Mixing height.......5500 ft AGL.
Transport winds.....West around 5 mph.
Ventilation Index...275 fair.

$$
Forecaster...Groenert
Requested by...Alicia Schlarb
Type of request...WILDFIRE
.TAG 2621344.0/BOI
.DELDT 09/07/26
.FormatterVersion 2.0.0
.EMAIL 2026.biggrass.plans@firenet.gov