681
FNUS75 KBYZ 261415
FWSBYZ
SPOT FORECAST FOR ROCK CREEK EAST...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
815 AM MDT MON OCT 26 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 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
MILD CONDITIONS WILL BE IN PLACE FOR TODAY WITH TERRAIN DRIVEN WINDS.
A FRONTAL PASSAGE LOOKS TO MOVE THROUGH THE AREA BETWEEN 0400 AND 0700
MDT TUESDAY MORNING WITH WINDS INCREASING OUT OF THE SOUTHWEST DURING
THIS TIME FRAME AND LIKELY PERSISTING THROUGH THE DAY. INTO TUESDAY
EVENING, WIND GUSTS DECREASE INTO THE 15 TO 25 MPH, BECOMING TERRAIN
DRIVEN AFTER MIDNIGHT. CLEAR CONDITIONS WILL PERSIST TUESDAY NIGHT INTO
WEDNESDAY. WINDS WEDNESDAY WILL BE MAINLY TERRAIN DRIVEN WITH A FEW GUSTS
NEAR 20 MPH IN THE AFTERNOON.
REST OF TODAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....48-52.
MIN HUMIDITY........45-49 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTHWEST WINDS 5 TO 6 MPH SHIFTING
TO THE SOUTH LATE IN THE AFTERNOON AT 4 TO 8 MPH
WITH GUSTS TO 16 MPH.
RIDGETOP...........WEST AROUND 10 TO 15 MPH.
MIXING HEIGHT.......INCREASING TO 3200 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST TO SOUTH 7 TO 13 MPH.
TIME (MDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........12 7 9 18 22 24 26 27
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0
TEMP............44 48 50 50 50 50 50 48
RH..............54 49 48 50 49 50 51 60
20 FT WIND DIR..W N NE E SE S S S
20 FT WIND SPD..6 6 6 6 6 6 6 6
20 FT WIND GUST.8 8 8 10 12 12 12 10
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN SHOWERS
AND SNOW SHOWERS OVERNIGHT. SLIGHT CHANCE OF
SNOW SHOWERS AFTER 3 AM.
CWR.................10 PERCENT.
CHANCE OF LIGHTNING.3 PERCENT.
MIN TEMPERATURE.....30-34.
MAX HUMIDITY........60-64 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 13 MPH. GUSTS UP TO 35 MPH
OVERNIGHT.
RIDGETOP...........SOUTHWEST BECOMING WEST AROUND 30 TO 40 MPH.
MIXING HEIGHT.......DECREASING TO 500 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTH 10 TO 15 MPH SHIFTING TO THE SOUTHWEST 15
TO 20 MPH OVERNIGHT.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........49 69 87 89 89 85 66 61 65 74 57 50
WEATHER COV..... CHC CHC CHC SCH SCH SCH
WEATHER TYPE.... RS 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 39 39 39 38 38 38 36 35
RH..............62 62 62 62 62 62 62 62 61 59 56 58
20 FT WIND DIR..S S S S S S S SW SW SW SW W
20 FT WIND SPD..6 6 6 6 6 6 6 8 10 12 12 13
20 FT WIND GUST.10 10 10 10 10 10 10 12 17 32 35 34
TUESDAY
SKY/WEATHER.........SUNNY. SLIGHT CHANCE OF SNOW SHOWERS EARLY IN
THE MORNING.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....41-45.
MIN HUMIDITY........34-38 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 15 TO 20 MPH WITH GUSTS TO
AROUND 40 MPH.
RIDGETOP...........WEST AROUND 30 MPH.
MIXING HEIGHT.......INCREASING TO 3800 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AT 20 TO 30 MPH.
TIME (MDT) 6 AM 9 AM NOON 3 PM
SKY (%).........32 18 11 13
WEATHER COV.....S CHC
WEATHER TYPE....SNSHWR NONE NONE NONE
TSTM COV........
CHC OF LTNG (%).0 0 0 0
TEMP............34 34 43 43
RH..............56 55 36 43
20 FT WIND......W 19G32 SW 20G36 SW 20G35 SW 18G30
FORECASTER...STETZER
REQUESTED BY...LARRY J LEE
TYPE OF REQUEST...PRESCRIBED
.TAG 2624426.2/BYZ
.DELDT 10/26/26
.FORMATTERVERSION 2.0.0
.EMAIL DREW.GRIMES@USDA.GOV,LARRY.J.LEE@USDA.GOV
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