626 
FNUS75 KBYZ 212027
FWSBYZ

Spot Forecast for Robertson Draw Fire...USFS
National Weather Service Billings MT
227 PM MDT Mon Jun 21 2021

Forecast is based on forecast start time of 1600 MDT on June 21. 
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...

Relatively light southeast winds will persist through this 
afternoon, with humidities at lower elevations of the east-facing 
slopes expected to drop into the low 20s. Expect terrain-driven 
winds the next two nights and early mornings, then weather-driven 
winds during the day. There contains a small chance for light rain
showers Tuesday evening and Wednesday, though a chance for 
wetting rain seems unlikely. A cold front crosses southeast 
Montana on Wednesday, but will not bring any any inclement weather
to the fire area.

.REST OF TODAY...

Sky/weather.........Sunny. 
CWR.................0 percent. 
LAL.................1...no thunderstorms. 
Max temperature.....66-74. 
Min humidity........22-27 percent. 
Wind (20 ft)........ 
 Slope/valley.......Southeast 7 to 10 mph...gusts 10 to 15 mph. 
 Ridgetop...........Southwest around 10 mph. 
Mixing height.......4100 ft AGL. 
Transport winds.....Southwest around 10 mph. 
Haines index........4. 

.TONIGHT...

Sky/weather.........Partly cloudy. 
CWR.................0 percent. 
LAL.................1...no thunderstorms. 
Min temperature.....51-56. 
Max humidity........35-45 percent. 
Wind (20 ft)........ 
 Slope/valley.......Southeast winds 5 to 8 mph, becoming
					downslope/downvalley after midnight.
 Ridgetop...........West around 15 mph. 
Mixing height.......Decreasing to 300 ft AGL. 
Transport winds.....Southwest around 10 mph. 

.TUESDAY...

Sky/weather.........Sunny. 
CWR.................0 percent. 
LAL.................1...no thunderstorms. 
Max temperature.....73-82. 
Min humidity........22-27 percent. 
Wind (20 ft)........ 
 Slope/valley.......Upslope/upvalley winds 6 to 8 mph, becoming
                    north 10 to 15 mph in the afternoon. 
 Ridgetop...........West around 15 mph. 
Mixing height.......Increasing to 6000 ft AGL. 
Transport winds.....West around 12 mph. 
Haines index........3. 

.TUESDAY NIGHT...

Sky/weather.........Mostly clear then becoming mostly cloudy.
					Slight chance for rain showers in the evening. 
CWR.................5 percent. 
LAL.................1...no thunderstorms. 
Min temperature.....57-61. 
Max humidity........38-42 percent. 
Wind (20 ft)........ 
 Slope/valley.......Northwest winds 6 to 12 mph, becoming
					downslope/downvalley 5 to 8 mph after sunset. 
 Ridgetop...........West around 10 mph. 
Mixing height.......Decreasing to 500 ft AGL. 
Transport winds.....West around 7 mph. 

.WEDNESDAY...

Sky/weather.........Mostly sunny. Chance of showers and 
                    thunderstorms in the afternoon. 
CWR.................14 percent. 
LAL.................2...1 to 8 strikes/15 min/cell. 
Max temperature.....72-81. 
Min humidity........20-25 percent. 
Wind (20 ft)........ 
 Slope/valley.......Upslope/upvalley 6 to 8 mph, becoming 
                    northwest 10 to 13 mph with gusts to around 24 
                    mph in the afternoon behind the cold front. 
					Gusty and erratic winds expected near 
					thunderstorms in the afternoon. 
 Ridgetop...........West around 10 mph. 
Mixing height.......Increasing to 6500 ft AGL. 
Transport winds.....West around 8 mph. 
Haines index........3. 

$$
Forecaster...Vertz/Reimer
Requested by...Bruce Giersdorf
Type of request...WILDFIRE
.TAG 2114152.6/BYZ
.DELDT 06/21/21
.FormatterVersion 2.0.0
.EMAIL bgiersdorf@yahoo.com