729
FNUS75 KTFX 201111
FWSTFX
SPOT FORECAST FOR RUGBY...HIDC
NATIONAL WEATHER SERVICE GREAT FALLS MT
511 AM MDT THU AUG 20 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 MDT ON AUGUST 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
TODAY AND TOMORROW IT WILL BE WARM AND DRY. THIS AFTERNOON
RELATIVE HUMIDITY WILL BE AS LOW AS 15%. TODAY WINDS WILL BE
AROUND 5 TO 10 MPH WITH GUSTS UP TO 20 MPH. TONIGHT THERE WILL BE
POOR HUMIDITY RECOVERY. TOMORROW WINDS WILL BE AROUND 5 TO 10 MPH
WITH GUSTS UP TO 15 MPH. THIS WEEKEND THERE WILL BE SHOWERS AND
THUNDERSTORMS AROUND THE FIRE.
TODAY
SKY/WEATHER.........SUNNY (10-20 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....78-83.
MIN HUMIDITY........15-20 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHEAST WINDS AROUND 5 MPH SHIFTING TO THE
WEST LATE IN THE AFTERNOON.
RIDGETOP...........WEST 15 TO 20 MPH.
MIXING HEIGHT.......8500 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 10 MPH SHIFTING TO THE WEST LATE
IN THE MORNING.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........11 32 14 4 4 3 1 1 9 4 5 3
WEATHER COV..... PTY PTY
WEATHER TYPE.... 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............55 55 57 61 68 71 74 76 78 79 80 80
RH..............49 49 49 47 39 33 28 25 22 20 20 21
20 FT WIND DIR..SE SE S S SW SW W W W W W W
20 FT WIND SPD..5 5 5 5 5 5 10 10 10 10 10 10
20 FT WIND GUST.10 10 10 10 15 15 15 15 20 20 20 20
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 20 20 20 20
MIX HGT (KFT)...0.5 0.5 0.5 0.5 2.0 3.0 4.5 6.0 7.0 7.5 8.5 8.5
TRANSP WIND DIR.S S S S SW W W W W W W W
TRANSP WIND SPD.10 10 10 10 10 10 10 15 15 15 15 15
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT) THEN BECOMING
MOSTLY CLOUDY (50-60 PERCENT) THEN BECOMING
PARTLY CLOUDY (40-50 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MIN TEMPERATURE.....55-60.
MAX HUMIDITY........41-46 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT AND VARIABLE WINDS OF 5 TO 10 MPH.
RIDGETOP...........NORTHWEST AROUND 20 MPH DECREASING TO 0 TO 5
MPH.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....WEST 10 TO 15 MPH SHIFTING TO THE NORTH AROUND
5 MPH EARLY IN THE EVENING, THEN SHIFTING TO
THE EAST LATE IN THE EVENING SHIFTING TO THE
NORTHEAST LATE IN THE EVENING SHIFTING TO THE
SOUTHEAST SHIFTING TO THE NORTH OVERNIGHT
SHIFTING TO THE EAST SHIFTING TO THE NORTHEAST
EARLY IN THE MORNING.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........1 7 19 17 29 45 37 40 53 55 50 36
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............79 78 74 69 67 65 64 63 62 62 59 59
RH..............22 27 32 34 35 36 37 35 36 37 38 40
20 FT WIND DIR..NW NW N NE NE E SE SE SE SE E N
20 FT WIND SPD..10 5 5 5 5 5 5 5 5 5 5 5
20 FT WIND GUST.20 15 10 10
RIDGE WIND DIR..W NW NW N N NW NW NW NW NW NW NW
RIDGE WIND SPD..20 20 20 15 10 5 0 5 5 5 5 5
MIX HGT (KFT)...7.5 2.0 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 NW N E NE SE SE N N E NE
TRANSP WIND SPD.15 10 5 5 5 5 5 5 5 5 5 5
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....78-83.
MIN HUMIDITY........24-29 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTH WINDS AROUND 5 MPH.
RIDGETOP...........NORTHWEST AROUND 5 MPH SHIFTING TO THE WEST
EARLY IN THE MORNING, THEN SHIFTING TO THE
NORTH LATE IN THE AFTERNOON.
MIXING HEIGHT.......7000 FT AGL.
TRANSPORT WINDS.....NORTH AROUND 5 MPH SHIFTING TO THE WEST IN THE
AFTERNOON.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........57 57 57 33 33 33 24 24 24 24 24 24
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............59 57 59 63 68 71 74 77 78 79 80 79
RH..............40 45 46 46 41 40 37 36 33 29 29 30
20 FT WIND DIR..N E E N N N N N N N N N
20 FT WIND SPD..5 0 0 0 0 0 5 5 5 5 5 5
20 FT WIND GUST. 5 5 5 5 5 10 10 10 15 15 15
RIDGE WIND DIR..NW W W SW SW SW SW W W W NW N
RIDGE WIND SPD..5 5 5 5 5 5 5 5 5 5 5 0
MIX HGT (KFT)...0.5 0.5 0.5 1.0 1.5 2.0 3.0 6.0 7.0 5.0 7.0 6.5
TRANSP WIND DIR.N NE NE N N N NW W W NW W W
TRANSP WIND SPD.5 5 5 5 5 5 5 10 10 10 10 10
FORECASTER...GESELL
REQUESTED BY...RCH
TYPE OF REQUEST...WILDFIRE
.TAG 2620058.0/TFX
.DELDT 08/20/26
.FORMATTERVERSION 2.0.0
.EMAIL XAVIER.DELATORRE@USDA.GOV,RYAN.KOOIKER@USDA.GOV,MTHDC@FIRENET.GOV, TFX.OPS@NOAA.GOV
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