290
FNUS75 KBYZ 202112
FWSBYZ
SPOT FORECAST FOR ROCK CREEK EAST RX...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
312 PM MDT TUE OCT 20 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON OCTOBER 27.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
CURRENTLY, THERE ARE TWO MAIN OPTIONS FOR HOW THE FORECAST WILL
DEVELOP NEXT WEEK. THE FIRST IS WARMER AND DRIER CONDITIONS, WITH
TEMPERATURES AT THE HIGH END OF THE RANGE AND HUMIDITY AT THE LOW
END. THE SECOND OPTION IS COOLER AND MORE UNSETTLED WEATHER. THIS
WOULD ALLOW AT LEAST A LOW CHANCE EACH DAY FOR LIGHT PRECIPITATION
AND AFTERNOON WINDS WOULD BE STRONGER, WITH GUSTS AROUND 20 MPH
MAKING IT DOWN INTO THE VALLEY AND RIDGETOP WINDS IN THE 20 TO 30
MPH RANGE. AT THIS TIME, WARM AND DRY INTO AT LEAST WEDNESDAY BEFORE
BECOMING COOLER AND MORE UNSETTLED IS THE MOST FAVORED TRACK, BUT
THIS MAY CHANGE AS MORE INFORMATION BECOMES AVAILABLE.
TUESDAY 10/27
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................LESS THAN 5 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....48-58.
MIN HUMIDITY........30-36 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTH TO SOUTHWEST WINDS 6 TO 12 MPH.
RIDGETOP...........SOUTH TO SOUTHWEST 10 TO 20 MPH.
MIXING HEIGHT.......INCREASING TO 1700 FT IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH TO SOUTHWEST 10 TO 20 MPH.
TUESDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY.
CWR.................LESS THAN 5 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....28-34.
MAX HUMIDITY........47-53 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 6 TO 12 MPH.
RIDGETOP...........WEST 10 TO 20 MPH.
MIXING HEIGHT.......DECREASING TO 500 FT OVERNIGHT.
TRANSPORT WINDS.....WEST 5 TO 15 MPH.
WEDNESDAY 10/28
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................LESS THAN 5 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....46-56.
MIN HUMIDITY........34-40 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 10 MPH.
RIDGETOP...........WEST 10 TO 20 MPH.
MIXING HEIGHT.......INCREASING TO 1800 FT IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 5 TO 15 MPH.
WEDNESDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY. SLIGHT CHANCE OF SNOW SHOWERS
OVERNIGHT.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....26-36.
MAX HUMIDITY........50-56 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 6 TO 12 MPH.
RIDGETOP...........WEST 10 TO 20 MPH.
MIXING HEIGHT.......DECREASING TO 500 FT OVERNIGHT.
TRANSPORT WINDS.....WEST 5 TO 15 MPH.
THURSDAY 10/29
SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF SNOW SHOWERS IN
THE MORNING AND SLIGHT CHANCE OF RAIN SHOWERS
DURING THE DAY.
CWR.................10 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....44-54.
MIN HUMIDITY........38-44 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 6 TO 12 MPH.
RIDGETOP...........SOUTH TO SOUTHWEST 10 TO 20 MPH.
MIXING HEIGHT.......INCREASING TO 1600 FT IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH TO SOUTHWEST 10 TO 20 MPH.
FORECASTER...ARCHER
REQUESTED BY...LARRY LEE
TYPE OF REQUEST...PRESCRIBED
.TAG 2624182.0/BYZ
.DELDT 10/20/26
.FORMATTERVERSION 2.0.0
.EMAIL LARRY.J.LEE@USDA.GOV
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