835
FNUS75 KBYZ 071021
FWSBYZ
SPOT FORECAST FOR HORSETHIEF SW RX...USWFS
NATIONAL WEATHER SERVICE BILLINGS MT
421 AM MDT TUE APR 7 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 MDT ON APRIL 09.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
A DISTURABNCE IN NORTHWEST FLOW IS EXPECTED TO TRACK OVER NORTHEAST MONTANA
EARLY THURSDAY. INDICATIONS ARE THIS WILL DRIVE A WEAK DRY COLD FRONT THROUGH
THE BURN SITE THURSDAY MORNING SHIFTING VARIABLE WINDS TO THE NORTH AT 8-16 MPH.
WINDS REMAIN SOMEWHAT BRISK THROUGH THE DAY AS THEY TURN TO THE NORTHEAST.
RH LEVELS WILL DROP INTO THE 30S IN THE AFTERNOON. WINDS TURN LIGHT TO THE EAST
THEN SOUTH THURSDAY NIGHT. FOR FRIDAY...LOOK FOR WARMER TEMPS AND SOMEWHAT
LOWER RH READINGS. SOUTHERLY WINDS UNDER 15 MPH WILL PREVAIL. BT
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....52-56.
MIN HUMIDITY........32-38 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING NORTH IN THE MORNING 8-16 MPH IN
THE AFTERNOON.
RIDGETOP...........WEST AROUND 20-25 MPH.
MIXING HEIGHT.......1800 FT AGL EARLY IN THE MORNING INCREASING TO
6000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....NORTH 12 TO 16 MPH.
TIME (MDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........39 39 39 19 19 19 23 23 23
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0
TEMP............36 40 44 48 51 52 53 54 53
RH..............58 53 48 44 40 37 35 34 35
20 FT WIND DIR..N N N NE NE NE NE NE NE
20 FT WIND SPD..8 11 12 10 9 8 6 6 6
20 FT WIND GUST.12 18 18 15 14 13 12 12 12
THURSDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....27-31.
MAX HUMIDITY........79-83 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EAST WINDS UP TO 6 MPH IN THE EVENING BECOMING
LIGHT.
RIDGETOP...........WEST AROUND 15 MPH.
MIXING HEIGHT.......5100 FT AGL EARLY IN THE EVENING DECREASING TO
100 FT AGL OVERNIGHT.
TRANSPORT WINDS.....NORTHEAST 9 TO 10 MPH SHIFTING TO THE EAST 5 TO
9 MPH IN THE LATE EVENING AND OVERNIGHT.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........23 23 23 19 19 19 10 10 10 12 12 12
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............52 49 45 42 40 38 36 34 33 31 30 29
RH..............37 41 46 51 56 61 65 69 72 75 78 80
20 FT WIND DIR..NE NE NE E E E E E E NE NE NE
20 FT WIND SPD..6 6 6 5 5 5 3 3 3 2 2 2
20 FT WIND GUST.11 11 11 10 10 10 6 6 6 5 5 5
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....63-67.
MIN HUMIDITY........25-30 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING SOUTHERLY 6-12 MPH BY
LATE MORNING.
RIDGETOP...........SOUTHWEST AROUND 10-15.
MIXING HEIGHT.......300 FT AGL EARLY IN THE MORNING INCREASING TO
4100 FT AGL IN THE AFTERNOON IN THE MORNING AND
EARLY AFTERNOON.
TRANSPORT WINDS.....SOUTHEAST 6 TO 12 MPH.
TIME (MDT) 6 AM 9 AM NOON 3 PM
SKY (%).........15 27 23 36
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CHC OF LTNG (%).0 0 0 0
TEMP............29 38 54 63
RH..............80 62 40 31
20 FT WIND......N 4 SE 4G7 SE 6G12 SE 6G13
FORECASTER...TESAR
REQUESTED BY...GRIFFIN
TYPE OF REQUEST...PRESCRIBED
.TAG 2609187.0/BYZ
.DELDT 04/07/26
.FORMATTERVERSION 2.0.0
.EMAIL RMGRIFFIN@BLM.GOV,DDAY@BLM.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page