733
FNUS75 KBYZ 252015
FWSBYZ
SPOT FORECAST FOR ROCK CREEK EAST...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
215 PM MDT SUN OCT 25 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 MDT ON OCTOBER 26.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
LOOK FOR LIGHT WIND FIELDS EARLY MONDAY RESULTING IN MAINLY
TERRAIN DRIVEN WINDS (DOWNSLOPE WEST/NORTHWEST). WINDS WILL BECOME
MORE UPSLOPE BY MIDDAY TO EARLY AFTERNOON (EAST/NORTHEAST) WITH
SOME GUSTS 10-14 MPH POSSIBLE. THERE IS SOME UNCERTAINTY REGARDING
LATE AFTERNOON AS WINDS MAY BECOME MORE SOUTHERLY AND A BIT
GUSTY. RH READINGS ARE EXPECTED TO REMAIN OVER 40% DURING THE DAY.
MONDAY NIGHT WINDS WILL TRANSITION TO SOUTH/SOUTHWEST AS A
WEATHER SYSTEM MOVES INTO THE AREA. THE CHANCE OF RAIN/SNOW
SHOWERS INCREASES LATE AND INTO TUESDAY MORNING. BRISK WESTERLY
WINDS TAKE OVER TUESDAY AS THE FRONT MOVES THROUGH THE AREA. BEST
CHANCE OF ANY PRECIP IS IN THE MORNING WITH JUST LINGERING
ISOLATED RAIN/SNOW SHOWERS POSSIBLE IN THE AFTERNOON. THE BRISK
WESTERLY WIND WILL DROP RH IN THE AFTERNOON INTO THE 30S RANGE.
MONDAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....48-53.
MIN HUMIDITY........41-46 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS MAINLY WEST/NORTHWEST UP TO 6 MPH
EARLY. SHIFTING TO THE EAST/NORTHEAST BY MIDDAY.
RIDGETOP...........SOUTHWEST AROUND 10 MPH.
MIXING HEIGHT.......500 FT AGL EARLY IN THE MORNING INCREASING TO
3100 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 7 TO 13 MPH.
TIME (MDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........22 15 17 13 19 21 35 24 26
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0
TEMP............34 42 47 49 51 51 51 51 48
RH..............60 54 47 46 48 48 49 51 59
20 FT WIND DIR..SW NW W NW NE NE E SE S
20 FT WIND SPD..3 4 4 5 6 6 6 6 5
20 FT WIND GUST.6 6 7 8 10 11 12 11 10
MONDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND SNOW
SHOWERS OVERNIGHT.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....30-34.
MAX HUMIDITY........56-63 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING SOUTHWEST 5 TO 6 MPH WITH
GUSTS TO AROUND 20 MPH AFTER 3 AM.
RIDGETOP...........SOUTHWEST AROUND 15 MPH.
MIXING HEIGHT.......800 FT AGL EARLY IN THE EVENING DECREASING TO
400 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTHWEST 9 TO 17 MPH SHIFTING TO THE WEST
AROUND 15 MPH EARLY IN THE MORNING.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........71 71 71 87 87 87 88 88 88 96 96 96
WEATHER COV..... CHC CHC CHC SCH CHC
WEATHER TYPE.... RS RS SW SW SW
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............45 40 38 38 38 39 39 38 39 37 36 35
RH..............62 68 69 66 61 59 56 58 56 56 56 57
20 FT WIND DIR..S S S SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..4 4 4 5 4 4 4 4 4 7 7 12
20 FT WIND GUST.7 7 7 10 10 10 7 7 7 20 20 23
TUESDAY
SKY/WEATHER.........PARTLY SUNNY. CHANCE OF SNOW SHOWERS IN THE
MORNING.
CWR.................12 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....44-48.
MIN HUMIDITY........35-39 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST/SOUTHWEST WINDS 10-15 MPH WITH GUSTS TO AROUND
30 MPH. STRONGEST GUSTS IN 7-10 AM.
RIDGETOP...........WEST AROUND 25-35 MPH.
MIXING HEIGHT.......600 FT AGL EARLY IN THE MORNING INCREASING TO
4800 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 15 TO 24 MPH.
TIME (MDT) 6 AM 9 AM NOON 3 PM
SKY (%).........75 58 37 32
WEATHER COV.....CHANCE CHANCE
WEATHER TYPE....SNSHWR SNSHWR NONE NONE
TSTM COV........
CHC OF LTNG (%).0 0 0 0
TEMP............33 34 44 45
RH..............58 57 37 43
20 FT WIND......W 12G26 W 15G33 W 13G27 W 11G23
FORECASTER...TESAR
REQUESTED BY...LARRY J LEE
TYPE OF REQUEST...PRESCRIBED
.TAG 2624426.1/BYZ
.DELDT 10/25/26
.FORMATTERVERSION 2.0.0
.EMAIL LARRY.J.LEE@USDA.GOV,DREW.GRIMES@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page