887
FNUS75 KTFX 151036
FWSTFX
SPOT FORECAST FOR SPRUCE...MTHDC
NATIONAL WEATHER SERVICE GREAT FALLS MT
436 AM MDT FRI MAY 15 2026
FORECAST IS BASED ON FORECAST START TIME OF 0700 MDT ON MAY 15.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
FAST, ZONAL FLOW OVER THE NORTHERN ROCKIES WILL HELP TO MAINTAIN
STRONG AND GUSTY WEST WINDS ACROSS CENTRAL MONTANA THROUGH THE
DAY TODAY. THERE IS AN 95% CHANCE THAT GUSTS REACH 35 MPH ACROSS
THE INCIDENT AREA, 75% CHANCE OF REACHING 40 MPH, AND EVEN A 25%
CHANCE OF EXCEEDING 45 MPH. THESE STRONG AND GUSTY WINDS AND DEEP
MIXING WILL RESULT IN LOW RELATIVE HUMIDITY VALUES DURING THE
AFTERNOON HOURS TODAY. A LARGE UPPER LEVEL DISTURBANCE MOVING
ACROSS THE WESTERN US THIS WEEKEND WILL RESULT IN COOLER AND
WETTER CONDITIONS ON SATURDAY AND SUNDAY, WITH STRONG AND GUSTY
NORTH WINDS ARRIVING TO THE INCIDENT AREA LATE SUNDAY MORNING OR
EARLY AFTERNOON AS A COLD FRONT DIVES SOUTH FROM CANADA. AT THIS
TIME THE CHANCE FOR WETTING PRECIPITATION ACROSS THE INCIDENT AREA
FROM SATURDAY MORNING THROUGH SUNDAY NIGHT IS AROUND A 95%
CHANCE, WITH A 60% CHANCE THAT AMOUNTS REACH 0.5".
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).
CWR.................5 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MAX TEMPERATURE.....52-57.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 15 TO 20 MPH. GUSTS UP TO 35 MPH
INCREASING TO 40 MPH LATE IN THE MORNING.
RIDGETOP...........WEST 35 TO 40 MPH DECREASING TO AROUND 30 MPH
IN THE AFTERNOON.
MIXING HEIGHT.......7500 FT AGL.
TRANSPORT WINDS.....WEST AROUND 25 MPH.
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........20 21 30 42 30 16 22 12 16 21 27
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............10 10 10 10 10 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0
TEMP............37 39 41 44 46 48 50 51 52 54 54
RH..............65 57 50 40 35 31 29 27 25 23 22
20 FT WIND DIR..W W W W W W W W W W W
20 FT WIND SPD..15 15 20 20 20 20 20 20 20 15 15
20 FT WIND GUST.30 35 35 40 35 35 30 30 30 30 30
RIDGE WIND DIR..W W W W W W W W W W W
RIDGE WIND SPD..40 40 40 35 35 30 30 30 30 30 30
MIX HGT (KFT)...2.0 3.0 4.0 4.5 5.5 6.0 6.5 7.0 7.0 7.5 7.0
TRANSP WIND DIR.W W W W W W W W W W W
TRANSP WIND SPD.25 25 25 25 25 25 25 25 25 25 25
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT) THEN BECOMING
MOSTLY CLOUDY (65-75 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MIN TEMPERATURE.....32-37.
MAX HUMIDITY........61-66 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 15 TO 20 MPH DECREASING TO 5 TO 10
MPH WITH GUSTS TO AROUND 30 MPH EARLY IN THE
EVENING.
RIDGETOP...........WEST 25 TO 30 MPH DECREASING TO 15 TO 20 MPH
LATE IN THE EVENING, THEN BECOMING SOUTHWEST 5
TO 10 MPH OVERNIGHT.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....WEST 20 TO 25 MPH DECREASING TO 10 TO 15 MPH IN
THE LATE EVENING AND OVERNIGHT.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........32 33 35 36 52 68 84 86 89 91 90 89
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............53 52 49 45 42 40 40 39 39 37 36 36
RH..............22 24 29 36 42 47 52 52 56 59 59 65
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..20 15 10 10 5 5 5 5 5 5 5 5
20 FT WIND GUST.30 30 30 20 15 15 10 10 10 10
RIDGE WIND DIR..W W W W W W W W SW SW S S
RIDGE WIND SPD..30 30 30 25 25 20 15 15 10 10 5 5
MIX HGT (KFT)...7.0 6.0 4.5 1.0 1.0 0.5 0.5 1.5 1.5 1.5 1.0 1.5
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.25 25 20 15 10 10 10 15 15 10 10 10
SATURDAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). SNOW LIKELY.
CWR.................0 PERCENT.
CHANCE OF THUNDER...12 PERCENT.
MAX TEMPERATURE.....42-47.
MIN HUMIDITY........36-41 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING NORTHWEST AROUND 15 MPH.
RIDGETOP...........SOUTHWEST 5 TO 10 MPH SHIFTING TO THE NORTHWEST
10 TO 15 MPH LATE IN THE MORNING.
MIXING HEIGHT.......5500 FT AGL.
TRANSPORT WINDS.....WEST 10 TO 15 MPH INCREASING TO 15 TO 20 MPH
LATE IN THE AFTERNOON.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........90 90 90 91 91 91 91 91 91 79 79 79
WEATHER COV.....CHC LKY LKY LKY LKY LKY LKY LKY CHC LKY LKY LKY
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 10 10 10 10 10 10
TEMP............36 35 37 38 40 40 40 41 41 41 43 41
RH..............66 66 61 62 56 56 56 56 54 52 49 46
20 FT WIND DIR..W W W W W NW NW NW W W NW NW
20 FT WIND SPD..0 5 5 5 5 5 10 10 10 10 10 15
20 FT WIND GUST.5 10 10 15 15 15 20 20 20 25
RIDGE WIND DIR..S S SW SW SW W W W NW NW NW NW
RIDGE WIND SPD..5 5 5 10 10 10 10 15 15 15 15 15
MIX HGT (KFT)...1.5 1.5 2.0 2.0 3.0 3.5 4.0 4.5 4.0 5.5 4.5 5.0
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.10 10 10 10 10 15 15 15 15 20 15 20
FORECASTER...MOLDAN
REQUESTED BY...ZACK
TYPE OF REQUEST...WILDFIRE
.TAG 2613681.1/TFX
.DELDT 05/15/26
.FORMATTERVERSION 2.0.0
.EMAIL BRENNAN.WILLIAMS@USDA.GOV,PER.FRISK@USDA.GOV,MTHDC@FIRENET.GOV, TFX.OPS@NOAA.GOV
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