FNUS75 KBYZ 200045

FWSBYZ



Spot Forecast for West Cook...BLM

National Weather Service Billings MT

645 PM MDT Tue Aug 19 2025



Forecast is based on forecast start time of 1900 MDT on August 19. 

If conditions become unrepresentative...contact the National Weather

Service.



Please contact our office if you have questions

or concerns with this forecast.



...HEAT ADVISORY IN EFFECT UNTIL 9 PM MDT WEDNESDAY...



...Low level jet activity tonight into Wednesday morning...

...Hot and dry through Wednesday...



.DISCUSSION...



Winds will trend out of the southeast overnight with poor RH 

recoveries, with low level jet activity over the area. This will 

cause the ridges to remain breezy and aid in ventilation. Hot, dry

and unstable conditions can be expected on Wednesday, ahead of a 

dry cold front. An initial wind shift to the northwest will occur 

in the early afternoon, with the main front coming through the 

fire area Wednesday night.



.TONIGHT...



Sky/weather.........Mostly clear. 

CWR.................0 percent. 

Chance of lightning.0 percent. 

Min temperature.....67-71. 

Max humidity........32-36 percent. 

Wind (20 ft)........ 

 Slope/valley.......East to southeast winds 5 to 10 mph

                    in the evening becoming southeast

                    6 to 12 mph overnight. 

 Ridgetop...........East to southeast 6 to 12 mph 

                    in the evening becoming southeast

                    15 to 25 mph overnight. 

Mixing height.......Decreasing to 400 ft AGL overnight. 

Transport winds.....South around 20 mph. 



.WEDNESDAY...



Sky/weather.........Mostly sunny. 

CWR.................0 percent. 

Chance of lightning.0 percent. 

Max temperature.....95-99. 

Min humidity........12-16 percent. 

Wind (20 ft)........ 

 Slope/valley.......South winds 6 to 12 mph shifting to the 

                    northwest 7 to 14 mph in the afternoon. 

 Ridgetop...........South 10 to 20 mph in the morning shifting

                    to the northwest 7 to 15 mph in the

                    afternoon. 

Mixing height.......Increasing to 13000 ft AGL in the 

                    afternoon. 

Transport winds.....Southwest around 16 mph becoming northwest

                    around 15 mph in the afternoon. 



$$

Forecaster...Palmquist

Requested by...Hannah

Type of request...WILDFIRE

.TAG 2520264.0/BYZ

.DELDT 08/19/25

.FormatterVersion 2.0.0

.EMAIL mtmcc@firenet.gov