606
FNUS75 KBYZ 151821
FWSBYZ
SPOT FORECAST FOR UNIT 51 N BRIDGERS...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
1221 PM MDT FRI MAY 15 2026
FORECAST IS BASED ON IGNITION TIME OF 1200 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
WARM AND DRY CONDITIONS WILL PREVAIL OVER THE SITE INTO SATURDAY.
LOOK FOR 20FT WINDS FROM THE WEST-SOUTHWEST INTO THE LOW TEENS
AND GUSTS INTO THE 20S TO 30 MPH, TERRAIN MAY INFLUENCE THE WIND
DIRECTION. UPSLOPE/UPVALLEY MAY BRING A SOUTHWEST INFLUENCE THIS
AFTERNOON, WITH OCCASIONAL WEST WINDS MIXING OUT OF THE VALLEY.
MIXING WILL BE STRONG THROUGH THE AFTERNOON.
RELATIVE HUMIDITY RECOVERIES WILL BE MODERATE OVERNIGHT. AN
ACTIVE WEATHER PATTERN LOOKS TO ARRIVE INTO THE REGION SATURDAY
AFTERNOON. THIS SYSTEM WILL BRING THE CHANCE FOR SHOWERS THROUGH
MONDAY AND A SLIGHT CHANCE OF THUNDERSTORMS SATURDAY AFTERNOON.
THE LATEST FORECAST HAS A FEW INCHES OF SNOWFALL OVER THE SITE
EARLY SUNDAY THROUGH MONDAY. CURRENTLY, THE CHANCE FOR AT LEAST
0.50 INCHES OF LIQUID PRECIPITATION THROUGH MONDAY IS GREATER THAN
75 PERCENT. MATOS
REST OF TODAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.1 PERCENT.
MAX TEMPERATURE.....55-59.
MIN HUMIDITY........18-22 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST TO SOUTHWEST WINDS 8 TO 15 MPH WITH GUSTS OF
20 TO 30 MPH.
RIDGETOP...........WEST TO SOUTHWEST AROUND 15 MPH WITH GUSTS UP TO
30 MPH.
MIXING HEIGHT.......INCREASING TO 9800 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 25 TO 30 MPH.
TIME (MDT) 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........5 10 15 20 32 37
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0
TEMP............50 52 53 57 57 56
RH..............33 28 25 22 20 19
20 FT WIND DIR..SW SW WSW WSW SW W
20 FT WIND SPD..11 12 13 14 15 13
20 FT WIND GUST.22 23 27 29 29 27
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.1 PERCENT.
MIN TEMPERATURE.....37-41.
MAX HUMIDITY........41-47 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 6 TO 12 MPH WITH GUSTS TO
AROUND 25 MPH EARLY IN THE EVENING BECOMING
A LIGHT NORTH AND DOWNSLOPE WIND OVERNIGHT.
RIDGETOP...........SOUTHWEST AROUND 15 MPH.
MIXING HEIGHT.......DECREASING TO 500 FT AGL OVERNIGHT.
TRANSPORT WINDS.....WEST 20 TO 25 MPH BECOMING NORTH AROUND 10 MPH
EARLY IN THE EVENING.
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..SW W W N N N N N N N N NW
20 FT WIND SPD..11 8 7 5 5 3 2 2 2 2 2 2
20 FT WIND GUST.26 20 16 13 10 9 8 7 7 7 7 7
SATURDAY
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS EARLY IN
THE AFTERNOON. SLIGHT CHANCE OF THUNDERSTORMS
LATE IN THE AFTERNOON. RAIN SHOWERS LIKELY LATE
IN THE AFTERNOON.
CWR.................26 PERCENT.
CHANCE OF LIGHTNING.22 PERCENT.
MAX TEMPERATURE.....50-54.
MIN HUMIDITY........36-41 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT DOWNSLOPE/DOWNVALLEY WINDS BECOMING WEST
UP TO 6 MPH WITH GUSTS TO AROUND 18 MPH IN THE
LATE MORNING AND AFTERNOON. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS LATE IN THE
AFTERNOON.
RIDGETOP...........WEST AROUND 10 MPH.
MIXING HEIGHT.......INCREASING TO 7200 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHEAST AROUND 10 MPH SHIFTING TO THE
WEST SOUTHWEST 15 TO 22 MPH LATE IN THE
MORNING.
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 3G10 SW 5G17 W 6G18 W 6G17
FORECASTER...MATOS
REQUESTED BY...JAMES RAY
TYPE OF REQUEST...PRESCRIBED
.TAG 2613551.1/BYZ
.DELDT 05/15/26
.FORMATTERVERSION 2.0.0
.EMAIL JAMES.M.RAY@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page