020
FNUS75 KBOI 061755
FWSBOI

Spot Forecast for Grand Jean Piles...USFS
National Weather Service Boise ID
1155 AM MDT Mon May 6 2024

Forecast is based on ignition time of 1200 MDT on May 06.
If conditions become unrepresentative...contact the National Weather
Service.

...WET AND COOL TODAY WITH MIXED PRECIPITATION AND ISOLATED THUNDERSTORMS...
...DRY AND WARMING TREND STARTING THURSDAY...

.DISCUSSION...
A cold front will move through the West Central Mountains later
today, bringing colder temperatures, snow/rain showers, and the
chance of a thunderstorm (<30% chance) late this afternoon. Snow
levels will be right around 5000 feet today, dropping to 3500 feet
by midnight tonight, and 4400 feet tomorrow. Wraparound showers
from a low pressure system to our east will continue through
tonight and tomorrow, bringing light precipitation and breezy
northwest winds. A deep upper level ridge will move in late
Wednesday, beginning a warming and drying trend through the
weekend. Clear conditions with low daytime relative humidities,
breezy afternoon easterly winds, and above normal temperatures
will dominate the weather Thursday-Sunday.

.REST OF TODAY...

Sky/weather.........Widespread rain/snow showers, isolated
                    thunderstorms. Chance of precipitation 80 percent.
                    New snow accumulation up to 1 inch.
Max temperature.....31 to 42.
Min humidity........64 to 74 percent.
CWR /0.10 inch/.....60 percent.
LAL.................2.
Wind - eye level....West 7 to 10 mph with
                    gusts to around 14 mph.
Mixing height.......3500 ft AGL.
Transport winds.....West around 20 mph.
Haines Index........2 very low.
Ventilation index...700 excellent.

.TONIGHT...

Sky/weather.........A slight chance of thunderstorms
                    and rain showers in the evening, then snow
                    showers likely after midnight. Chance of
                    precipitation near 100 percent. Snow
                    accumulation of 1 to 3 inches.
Min temperature.....20 to 28.
Max humidity........93 to 98 percent.
CWR /0.10 inch/.....70 percent.
LAL.................2 in the evening, decreasing to 1 after
                    midnight.
Wind - eye level....West 4 to 8 mph. Gusts up to 20 mph in the
                    evening, decreasing to 14 mph after midnight.
Mixing height.......700 ft AGL.
Transport winds.....West around 10 mph.
Haines Index........3 very low.
Ventilation index...70 poor.

.TUESDAY...

Sky/weather.........Snow showers. Chance of snow 80 percent. Snow
                    accumulation of 1 to 2 inches.
Max temperature.....28 to 38.
Min humidity........56 to 63 percent.
CWR /0.10 inch/.....50 percent.
LAL.................1.
Wind - eye level....West 6 to 10 mph. Gusts up to 18 mph in the
                    morning, increasing to 24 mph in the afternoon.
Mixing height.......5000 ft AGL.
Transport winds.....Northwest around 25 mph.
Haines Index........2 very low.
Ventilation index...1250 excellent.

$$
Forecaster...Adams
Requested by...jeff rowett
Type of request...PRESCRIBED
.TAG 2413270.0/BOI
.DELDT 05/06/24
.FormatterVersion 2.0.0
.EMAIL jeffery.rowett@usda.gov