436
FNUS75 KTFX 241133
FWSTFX
SPOT FORECAST FOR SIEBEN...HIDC
NATIONAL WEATHER SERVICE GREAT FALLS MT
533 AM MDT MON AUG 24 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 MDT ON AUGUST 24.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
DRY AND LESS WINDY CONDITIONS MOVE IN THE WAKE OF YESTERDAY'S
FRONTAL PASSAGE; HOWEVER, THERE WILL STILL BE SOME GUSTY WINDS IN
THE AFTERNOON AND A NORTH TO NORTHEASTERLY WIND SHIFT TOWARDS THE
END OF THE DAY INTO THIS EVENING. A SUBTLE SHORTWAVE MOVES INTO
SOUTHWEST MONTANA TUESDAY MORNING AND BRINGS INCREASED CLOUDS AND
PERHAPS A LIGHT SHOWER OR VIRGA, BUT THIS LOOKS TO STAY SOUTH OF
THE SIEBEN SITE.
TODAY
SKY/WEATHER.........SUNNY (5-15 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....80-85.
MIN HUMIDITY........11-16 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHERLY WINDS 5 TO 10 MPH SHIFTING
TO THE WEST TO NORTHWEST 5 TO 15 MPH IN THE LATE MORNING
AND AFTERNOON.
RIDGETOP...........WEST 10 TO 20 MPH.
MIXING HEIGHT.......7000 FT AGL.
TRANSPORT WINDS.....WEST 5 TO 10 MPH INCREASING TO AROUND 15 MPH
LATE IN THE AFTERNOON.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........2 19 4 4 2 2 4 1 4 6 9 9
WEATHER COV..... PTY PTY PTY PTY
WEATHER TYPE.... SMK SMK SMK SMK
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............50 50 53 58 65 69 73 76 79 80 81 82
RH..............57 58 53 45 37 32 27 22 19 17 16 16
20 FT WIND DIR..SW SE SE S W W W W NW NW NW NW
20 FT WIND SPD..5 5 5 5 5 10 10 10 10 5 5 5
20 FT WIND GUST.10 10 10 10 15 15 15 20 20 15 15
RIDGE WIND DIR..W W W W W W W W W W W W
RIDGE WIND SPD..15 15 20 20 20 15 15 15 15 15 15 15
MIX HGT (KFT)...0.5 0.5 0.5 1.5 3.0 4.0 5.5 6.0 6.5 7.0 7.0 7.0
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.10 10 5 10 10 10 10 10 15 15 15 15
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....48-53.
MAX HUMIDITY........65-70 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTH WINDS 5 TO 15 MPH BECOMING LIGHT.
RIDGETOP...........NORTHERLY 5 TO 10 MPH BECOMING EASTERLY.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....NORTHWEST 5 TO 10 MPH SHIFTING TO THE NORTH IN
THE LATE EVENING AND OVERNIGHT.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........5 15 15 11 31 27 19 32 30 37 30 25
WEATHER COV.....PTY PTY PTY
WEATHER TYPE....SMK SMK SMK
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............81 80 76 69 66 63 61 59 58 56 54 53
RH..............17 18 23 30 35 41 45 48 53 56 60 66
20 FT WIND DIR..NW N NE NE NE NE NE NE NE N N N
20 FT WIND SPD..10 10 5 5 5 5 5 5 5 5 5 0
20 FT WIND GUST.15 15 15 10 10 10 10 10 10 10 10 5
RIDGE WIND DIR..W NW N N N N NE NE NE NE E E
RIDGE WIND SPD..10 10 10 10 5 5 5 5 5 5 5 5
MIX HGT (KFT)...6.0 4.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.W W N N NE N N N N N N N
TRANSP WIND SPD.10 10 5 10 10 10 10 10 10 10 10 10
TUESDAY
SKY/WEATHER.........PARTLY SUNNY (20-35 PERCENT)
CWR.................0 PERCENT.
CHANCE OF THUNDER...4 PERCENT.
MAX TEMPERATURE.....81-86.
MIN HUMIDITY........15-20 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING NORTHEAST AROUND 5 TO 10 MPH
IN THE AFTERNOON.
RIDGETOP...........EAST AROUND 5 TO 10 MPH BECOMING SOUTHERLY.
MIXING HEIGHT.......7500 FT AGL.
TRANSPORT WINDS.....NORTHEASTERLY 5 TO 10 MPH SHIFTING TO WESTERLY 10
TO 15 MPH.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........35 35 35 18 18 18 6 6 6 6 6 6
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............52 50 53 57 64 68 71 75 78 81 83 83
RH..............70 70 67 58 49 42 37 32 27 23 21 21
20 FT WIND DIR..N N N NE NE NE NE NE NE NE NE NE
20 FT WIND SPD..0 0 0 0 0 0 5 5 5 5 5 5
20 FT WIND GUST.5 5 5 10 10 10 10 10 10 15 15 15
RIDGE WIND DIR..E E SE S S S S SW SW SW S SE
RIDGE WIND SPD..5 5 5 5 5 5 5 5 5 0 0 0
MIX HGT (KFT)...0.5 0.5 0.5 1.0 1.5 2.5 2.5 3.5 5.0 5.0 7.5 7.0
TRANSP WIND DIR.N N N N NE NE E SW SW S W W
TRANSP WIND SPD.10 5 5 5 5 5 5 5 10 10 10 15
FORECASTER...GREELY
REQUESTED BY...MIKKELSON
TYPE OF REQUEST...WILDFIRE
.TAG 2620228.2/TFX
.DELDT 08/24/26
.FORMATTERVERSION 2.0.0
.EMAIL BRAEDEN.MIKKELSON@MT.GOV,MTHDC@FIRENET.GOV,CHARLIE.EWART@MT.GOV, TFX.OPS@NOAA.GOV
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