397
FNUS75 KBYZ 151151
FWSBYZ
SPOT FORECAST FOR UNIT 51 N BRIDGERS...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
551 AM MDT FRI MAY 15 2026
FORECAST IS BASED ON IGNITION TIME OF 0700 MDT ON MAY 15.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
OUTSIDE OF MAYBE A FEW LIGHT SPRINKLES THIS MORNING, DRY
CONDITIONS AND SOUTHWEST TO WEST WINDS CAN BE EXPECTED AT THE BURN
SITE TODAY. AFTERNOON HUMIDITY WILL BOTTOM OUT IN THE UPPER TEENS
TO 20 PERCENT. LOOK FOR WINDS TO DECREASE THIS EVENING, SHIFTING
TO THE NORTH OR LIGHT AND TERRAIN-DRIVEN OVERNIGHT, WITH MODERATE
RH RECOVERIES.
A STRONGER WEATHER SYSTEM IS STILL ON TRACK TO MOVE INTO THE
REGION LATE SATURDAY. LOOK FOR SOUTHERLY WINDS IN THE MORNING TO
SHIFT OUT OF THE WEST IN THE AFTERNOON. THIS SYSTEM WILL BRING A
CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS BY MID
AFTERNOON, WITH SHOWERS INCREASING INTO SATURDAY NIGHT. PERIODS OF
SHOWERS ARE FORECAST TO CONTINUE INTO MONDAY NIGHT. PRECIPITATION
TOTALS COULD EXCEED 0.50 INCHES WITH A FEW INCHES OF SNOW AT THE
BURN SITE BY MONDAY NIGHT.
TODAY
SKY/WEATHER.........PARTLY CLOUDY BECOMING MOSTLY SUNNY. LIGHT SPRINKLES
POSSIBLE THIS MORNING.
CWR.................3 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....54-59.
MIN HUMIDITY........18-23 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST TO WEST WINDS 6 TO 16 MPH. GUSTS UP
TO 28 MPH IN THE LATE MORNING AND AFTERNOON.
RIDGETOP...........WEST 20 TO 30 MPH.
MIXING HEIGHT.......INCREASING TO 9800 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 20 TO 30 MPH.
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........60 40 20 6 9 5 10 15 20 32 37
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0
TEMP............40 43 45 48 49 51 53 54 55 56 56
RH..............44 38 35 33 30 27 26 24 22 19 20
20 FT WIND DIR..SW SW WSW W W W W W W W W
20 FT WIND SPD..11 11 13 13 15 14 13 13 12 12 12
20 FT WIND GUST.20 22 24 26 28 28 28 28 27 26 25
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.1 PERCENT.
MIN TEMPERATURE.....37-41.
MAX HUMIDITY........42-47 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTHWEST WINDS 6 TO 12 MPH WITH GUSTS TO
AROUND 25 MPH EARLY IN THE EVENING BECOMING
A LIGHT NORTH OR DOWNSLOPE WIND OVERNIGHT.
RIDGETOP...........WEST AROUND 15 MPH.
MIXING HEIGHT.......DECREASING TO 500 FT AGL OVERNIGHT.
TRANSPORT WINDS.....WEST AROUND 25 MPH BECOMING NORTH AROUND 10
MPH OVERNIGHT.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........26 30 36 44 48 58 71 64 56 83 86 94
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............57 55 53 49 46 45 44 43 42 41 41 41
RH..............20 20 23 27 30 33 35 37 38 39 40 41
20 FT WIND DIR..W NW NW N N N N N N N N NW
20 FT WIND SPD..11 8 6 4 3 2 2 2 2 2 2 2
20 FT WIND GUST.25 20 18 12 9 6 6 5 5 5 5 5
SATURDAY
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS IN
THE AFTERNOON. SLIGHT CHANCE OF THUNDERSTORMS
LATE IN THE AFTERNOON.
CWR.................26 PERCENT.
CHANCE OF LIGHTNING.20 PERCENT.
MAX TEMPERATURE.....50-54.
MIN HUMIDITY........37-41 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......DOWNSLOPE/DOWNVALLEY OR SOUTHWEST 2 TO 7 MPH,
INCREASING BY LATE MORNING AND BECOMING
WEST IN THE AFTERNOON. GUSTS UP TO 20 MPH
DURING THE AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS.
RIDGETOP...........SOUTHWEST TO WEST 15 TO 30 MPH.
MIXING HEIGHT.......INCREASING TO 7200 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH AROUND 10 MPH SHIFTING TO THE
WEST SOUTHWEST AROUND 25 MPH BY AFTERNOON.
TIME (MDT) 6 AM 9 AM NOON 3 PM
SKY (%).........95 85 75 85
WEATHER COV..... CHANCE
WEATHER TYPE....NONE NONE NONE RNSHWR
TSTM COV........ S CHC
CHC OF LTNG (%).0 0 10 20
TEMP............40 46 50 49
RH..............43 38 39 51
20 FT WIND......S 2G7 SW 5G17 W 8G20 W 8G18
FORECASTER...PALMQUIST
REQUESTED BY...JAMES RAY
TYPE OF REQUEST...PRESCRIBED
.TAG 2613551.0/BYZ
.DELDT 05/15/26
.FORMATTERVERSION 2.0.0
.EMAIL JAMES.M.RAY@USDA.GOV
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