187
FNUS75 KBYZ 032221
FWSBYZ

Spot Forecast for South Stocker RX...USFS
National Weather Service Billings MT
421 PM MDT Fri May 3 2024

Forecast is based on ignition time of 0900 MDT on May 04.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...

...Gusts to 40 mph with RH around 20% Sunday...

Mostly sunny and dry Saturday with increasing high clouds for the
afternoon. Southeast winds will prevail but should stay below
15mph on the burn site. RH values drop to around 20 percent in the
afternoon with temperatures in the low to mid 60s. Mostly clear
and dry Saturday night, with winds turning to the south and
remaining elevated through the night, especially at and just above
ridgetop elevations. These gusty winds just off the surface may
keep any remaining fire aggitated overnight. Starting off Sunny
Dry and Breezy Sunday. Inversion should break around 11am dropping
RH values toward 20 percent and increasing southerly wind gusts
into the 35 to 40 mph range for the afternoon (25% chance for a gust
over 45mph). The strongest winds look to be around 3pm. Clouds will
be on the increase Sunday afternoon and will be of the thicker variety.
Chambers


.SATURDAY...

Sky/weather.........Sunny with increasing high clouds in the
                    afternoon (up to 30% coverage by 5pm).
CWR.................0 percent.
LAL.................1...no thunderstorms.
Max temperature.....62-66.
Min humidity........19-23 percent.
Wind (20 ft)........
 Slope/valley.......Southeast winds 7 to 14 mph.
 Ridgetop...........southeast around 11 mph.
Mixing height.......2800 ft AGL early in the morning increasing to
                    7500 ft AGL in the afternoon.
Transport winds.....South around 13 mph.
Haines index........3.

.SATURDAY NIGHT...

Sky/weather.........Mostly clear.
CWR.................0 percent.
LAL.................1...no thunderstorms.
Min temperature.....40-44.
Max humidity........58-62 percent.
Wind (20 ft)........
 Slope/valley.......Southeast winds 8 to 16 mph.
 Ridgetop...........Southeast around 20 mph.
Mixing height.......7000 ft AGL early in the evening decreasing to
                    400 ft AGL overnight.
Transport winds.....Southeast around 20 mph.

.SUNDAY...

Sky/weather.........Mostly sunny in the morning with increasing clouds
                    in the afternoon (50% by 5pm).
CWR.................0 percent.
LAL.................1...no thunderstorms.
Max temperature.....76-80.
Min humidity........20-24 percent.
Wind (20 ft)........
 Slope/valley.......South winds 10 to 15 mph in the morning. Becoming
                    South 15 to 25 mph with gusts to 37 mph after 11am.
                    Strongest gusts around 3pm.
 Ridgetop...........South around 23 mph.
Mixing height.......500 ft AGL early in the morning increasing to
                    9900 ft AGL in the afternoon.
Transport winds.....South around 30 mph.
Haines index........4.

$$
Forecaster...Chambers
Requested by...Cody S Phillips
Type of request...PRESCRIBED
.TAG 2412752.4/BYZ
.DELDT 05/03/24
.FormatterVersion 2.0.0
.EMAIL cody.phillips2@usda.gov