243
FNUS75 KBYZ 120859
FWSBYZ
SPOT FORECAST FOR UNIT 51 N BRIDGERS...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
259 AM MDT TUE MAY 12 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON MAY 12.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
LOOK FOR MOSTLY SUNNY SKIES AND LIGHT WINDS ACROSS THE BURN SITE
TODAY. PREVAILING DIRECTION SHOULD BE EASTERLY. MINIMUM RH
READINGS LATE IN THE AFTERNOON WILL BE IN THE UPPER TEENS.
OVERNIGHT RH RECOVERY IS EXPECTED TO BE IN THE 40S. MODELS ARE
SHOWING EASTERLY WINDS OVERNIGHT, BUT WE SUSPECT IT WILL BE
VARIABLE OR BECOME TERRAIN DRIVEN LATE.
WEDNESDAY LOOKS TO BE MORE ACTIVE WITH AN INCREASING CHANCE OF
SHOWERS AND POSSIBLY AN ISOLATED THUNDERSTORM. WINDS WILL
GENERALLY BE SOUTHERLY, AND BECOME MORE GUSTY IN THE AFTERNOON.
WHILE THERE IS JUST A SLIGHT CHANCE OF THUNDERSTORMS AFFECTING THE
BURN SITE, STORMS MAY BE MOSTLY DRY AND PRODUCE LOCAL WIND GUSTS
TO 40-50 MPH IN THEIR VICINITY. BT
TODAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....68-73.
MIN HUMIDITY........16-21 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EASTERLY WINDS UP TO 4-8 MPH EARLY IN THE MORNING
BECOMING LIGHT.
RIDGETOP...........EAST AROUND 10 MPH.
MIXING HEIGHT.......1400 FT AGL EARLY IN THE MORNING INCREASING TO
6400 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHEAST 9 MPH SHIFTING TO THE WEST 10
TO 12 MPH IN THE AFTERNOON.
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........8 9 9 13 11 15 25 17 7 4
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0
TEMP............48 52 58 61 63 65 67 70 70 71
RH..............50 42 35 32 29 27 23 21 18 19
20 FT WIND DIR..E E E E E E E E E E
20 FT WIND SPD..6 6 6 6 6 7 7 7 8 6
20 FT WIND GUST.10 10 11 12 12 13 13 14 13 12
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....46-50.
MAX HUMIDITY........41-49 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EAST WINDS UP TO 6 MPH. GUSTS UP TO 18 MPH
EARLY IN THE EVENING.
RIDGETOP...........EAST AROUND 10 MPH.
MIXING HEIGHT.......5100 FT AGL EARLY IN THE EVENING DECREASING TO
500 FT AGL OVERNIGHT.
TRANSPORT WINDS.....WEST AROUND 10 MPH SHIFTING TO THE EAST 9 TO 13
MPH.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........8 7 9 11 7 15 32 22 27 19 24 31
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............72 70 66 59 57 56 53 52 52 50 51 50
RH..............18 21 29 36 39 41 44 46 47 47 46 46
20 FT WIND DIR..E E E E E E E E E E E SE
20 FT WIND SPD..5 6 6 6 7 8 7 7 5 5 5 6
20 FT WIND GUST.13 14 16 16 18 18 18 18 17 14 14 15
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY. SLIGHT CHANCE OF RAIN SHOWERS
EARLY IN THE AFTERNOON. CHANCE OF RAIN SHOWERS
AND SLIGHT CHANCE OF THUNDERSTORMS LATE IN THE
AFTERNOON.
CWR.................4 PERCENT.
CHANCE OF LIGHTNING.12 PERCENT.
MAX TEMPERATURE.....78-83.
MIN HUMIDITY........17-21 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTH WINDS 7 TO 14 MPH. GUSTS UP TO 28 MPH.
GUSTY (40-50 MPH) AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS LATE IN THE AFTERNOON.
RIDGETOP...........SOUTHWEST AROUND 25 MPH.
MIXING HEIGHT.......500 FT AGL EARLY IN THE MORNING INCREASING TO
8200 FT AGL IN THE AFTERNOON INCREASING TO 4800
FT AGL EARLY IN THE MORNING INCREASING TO 11600
FT AGL IN THE AFTERNOON IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHEAST 8 TO 13 MPH SHIFTING TO THE SOUTH 14
TO 21 MPH LATE IN THE MORNING, THEN INCREASING
TO SOUTHWEST 20 TO 27 MPH LATE IN THE AFTERNOON
DECREASING TO AROUND 18 MPH LATE IN THE
AFTERNOON.
TIME (MDT) 6 AM 9 AM NOON 3 PM
SKY (%).........45 38 62 60
WEATHER COV..... CHANCE
WEATHER TYPE....NONE NONE NONE RNSHWR
TSTM COV........ S CHC
CHC OF LTNG (%).0 0 8 13
TEMP............49 64 79 78
RH..............44 29 19 23
20 FT WIND......SE 6G18 SE 7G21 S 12G26 SW 16G31
FORECASTER...TESAR
REQUESTED BY...JAMES RAY
TYPE OF REQUEST...PRESCRIBED
.TAG 2613173.2/BYZ
.DELDT 05/12/26
.FORMATTERVERSION 2.0.0
.EMAIL JAMES.M.RAY@USDA.GOV
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