261
FNUS75 KBOI 171409
FWSBOI

Spot Forecast for Crawford RX Patrol Day...USFS
National Weather Service Boise ID
809 AM MDT Fri May 17 2024

Forecast is based on ignition time of 0900 MDT on May 17.
If conditions become unrepresentative...contact the National Weather
Service.

...MUCH COOLER AND WINDIER THIS AFTERNOON AFTER AM COLD FRONTAL FRONTAL PASSAGE...
...BREEZY AND COOL THIS WEEKEND WITH LOW CHANCE OF RAIN ON SUNDAY AFTERNOON...

.DISCUSSION...
The dry cold frontal passage is currently moving across the
region as of 0745L, with terrain delaying some of the stronger
winds near the burn area. Westerly winds will pick up in the Long
Valley later this morning, with much cooler temperatures and
slightly lower afternoon RH values this afternoon. Similar
conditions will continue through Saturday, with another cold
frontal passage expected on Sunday morning around 0500-0800L. This
frontal passage will bring winds 5-10 mph with gusts to 20 mph
and a slight chance of rain to the burn area, with current
probabilities of at least a trace of rainfall at 25% by Sunday
afternoon. Snow levels will be around 5400-5800 feet after the
frontal passage on Sunday.

.REST OF TODAY...

Sky/weather.........Partly cloudy this morning, clearing this afternoon.
Max temperature.....55 to 60.
Min humidity........22 to 27 percent.
CWR /0.10 inch/.....0 percent.
LAL.................1.
Wind - eye level....West 7 to 10 mph. Gusts up to 20 mph this morning with
the frontal passage around 0900L. By the afternoon, expect
 northwest winds 12 to 18 mph with gusts to 28 mph. Locally
higher gusts to 35 mph on ridgetops.
Mixing height.......7500 ft AGL.
Transport winds.....West around 30 mph.
Haines Index........2 very low.
Ventilation index...2250 excellent.

.TONIGHT...

Sky/weather.........Clear.
Min temperature.....26 to 31.
Max humidity........64 to 74 percent.
CWR /0.10 inch/.....0 percent.
LAL.................1.
Wind - eye level....Northwest 5 to 10 mph with gusts to around 20
                    mph in the evening, becoming less than 5 mph
                    after midnight.
Mixing height.......400 ft AGL.
Transport winds.....Southeast around 5 mph.
Haines Index........3 very low.
Ventilation index...20 poor.

.SATURDAY...

Sky/weather.........Sunny.
Max temperature.....59 to 64.
Min humidity........23 to 28 percent.
CWR /0.10 inch/.....0 percent.
LAL.................1.
Wind - eye level....Southwest 5-10 mph in the morning, becoming southwest
10-15 mph with gusts up to 20 mph in the afternoon.
Mixing height.......6500 ft AGL.
Transport winds.....Southwest around 22 mph.
Haines Index........3 very low.
Ventilation index...1430 excellent.

$$
Forecaster...Adams
Requested by...Boise NF-Cascade RD
Type of request...PRESCRIBED
.TAG 2414502.0/BOI
.DELDT 05/17/24
.FormatterVersion 2.0.0
.EMAIL matthew.haupt@usda.gov