183
FNUS75 KTFX 042230
FWSTFX

Spot Forecast for Mount Royal Pile Rx...BLM
National Weather Service Great Falls MT
330 PM MST Wed Dec 4 2024

Forecast is based on ignition time of 1700 MST on December 04.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...

A northwest flow aloft persists across the region through the
next several days downstream of an upper level ridge of high
pressure centered over the Pacific NW. A shallow cool/moist
airmass will spread low clouds across the plains adjacent to the
Sweet Grass Hills tonight, where some fog is also possible but
Mount Royal is likely to remain above a low-level temperature
inversion and lower clouds with just thin high cloud-cover
at times through Thursday.

Looking ahead, a series of weather disturbances moving over the
upper level ridge will bring a faster westerly flow and increasing
winds Friday and Saturday. Strong west winds are likely to
develop Saturday with gusts in excess of 50 mph likely (60-70%)
late Saturday. A cold front moves through the area Saturday night
followed by a shift to gusty northwest winds with colder
temperatures and snow developing on Sunday.

.TONIGHT...

Sky/weather.........Partly cloudy (45-55 percent).
CWR.................0 percent.
LAL.................1.
Min temperature.....23-28.
Max humidity........66-71 percent.
Wind (20 ft)........
 Slope/valley.......Northwest winds 5 to 10 mph.
Mixing height.......Less than 500 ft AGL.
Transport winds.....Northwest around 10 mph.

.THURSDAY...

Sky/weather.........Partly cloudy (45-55 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....33-38.
Min humidity........50-55 percent.
Wind (20 ft)........
 Slope/valley.......Northwest winds 5 to 10 mph.
Mixing height.......Less than 500 ft AGL.
Transport winds.....Northwest around 10 mph.
Haines Index........2 or very low potential for large plume
                    dominated fire growth.

.THURSDAY NIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
LAL.................1.
Min temperature.....27-32.
Max humidity........72-77 percent.
Wind (20 ft)........
 Slope/valley.......Northwest winds 10 to 15 mph.
Mixing height.......0 ft AGL.
Transport winds.....Northwest around 15 mph.

$$
Forecaster...Hoenisch
Requested by...Logan Lewis
Type of request...PRESCRIBED
.TAG 2427703.1/TFX
.DELDT 12/04/24
.FormatterVersion 2.0.0
.EMAIL llewis@blm.gov