571
FNUS75 KBYZ 041246
FWSBYZ

Spot Forecast for Hyalite Rx...USFS
National Weather Service Billings MT
646 AM MDT Fri Oct 4 2024

Forecast is based on ignition time of 0600 MDT on October 04.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office if you have questions
or concerns with this forecast.

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 6 PM MDT
SATURDAY...

.DISCUSSION...

Strong winds with low relative humidities will occur today ahead
of a cold front passage late this evening. Ahead of the front,
southwest wind gusts of 30 to 35 mph will be common. With this,
occasional gusts to 45 mph are possible during the afternoon and
early evening. Ridgetop winds will also increase through the day,
becoming strong by this evening. The front looks to arrive around
11 PM MDT to midnight at the burn site. Breezy westerly winds
behind the front with moderate relative humidity recoveries will
exist. On Saturday, the westerly winds will decrease as relative
humidities drop into the upper teens to lower 20s.

.TODAY...

Sky/weather.........Sunny.
CWR.................0 percent.
LAL.................1...no thunderstorms.
Max temperature.....69-73.
Min humidity........14-18 percent.
Wind (20 ft)........
 Slope/valley.......South 9 to 14 mph with gusts to 20 mph early
                    becoming southwest 15 to 20 mph with gusts
                    to 35 mph during the afternoon.
 Ridgetop...........West around 30 mph becoming southwest 40 to
                    45 mph in the afternoon.
Mixing height.......Increasing to 8000 ft AGL.
Transport winds.....Southwest around 35 mph.
Haines index........5.

.TONIGHT...

Sky/weather.........Partly cloudy then becoming mostly cloudy.
                    Slight chance of rain showers in the evening.
CWR.................Less than 5 percent.
LAL.................1...no thunderstorms.
Min temperature.....33-37.
Max humidity........60-64 percent.
Wind (20 ft)........
 Slope/valley.......Southwest 15 to 20 mph with gusts to around 35
                    mph becoming west 8 to 13 mph with gusts to
                    around 20 mph around midnight.
 Ridgetop...........Southwest 50 to 60 mph early becoming west
                    around 30 to 40 mph by midnight.
Mixing height.......Decreasing to 800 ft AGL.
Transport winds.....West around 35 mph.

.SATURDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
LAL.................1...no thunderstorms.
Max temperature.....53-57.
Min humidity........18-22 percent.
Wind (20 ft)........
 Slope/valley.......West 9 to 14 mph.
 Ridgetop...........West around 20 mph.
Mixing height.......Increasing to 5000 ft AGL.
Transport winds.....West around 20 mph.
Haines index........3.

$$
Forecaster...Arends/Wetenkamp
Requested by...James Ray
Type of request...PRESCRIBED
.TAG 2423362.1/BYZ
.DELDT 10/04/24
.FormatterVersion 2.0.0
.EMAIL James.M.Ray@usda.gov,liam.t.dillaway@usda.gov