143
FNUS75 KBYZ 232039
FWSBYZ
SPOT FORECAST FOR PROSPECT CEDAR...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
239 PM MDT WED SEP 23 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 MDT ON SEPTEMBER 25.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
DRY AND BREEZY CONDITIONS ARE FORECAST AT THE SITE FRIDAY
THROUGH SATURDAY. SOUTHWEST WINDS WILL PERSIST THROUGH THE
FORECAST PERIOD, WITH GUSTS IN THE 20S AND 30S MPH COMMON. A DRY
COLD FRONT WILL MOVE THROUGH SOUTHERN MONTANA AND NORTHERN WYOMING
LATE FRIDAY INTO SATURDAY MORNING, THOUGH THIS DOES NOT LOOK TO
IMPACT THE SITE AT THIS TIME. THE CHANCE FOR PRECIPITATION IS VERY
LOW (LESS THAN 15 PERCENT) THROUGH SATURDAY. MATOS
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....53-57.
MIN HUMIDITY........28-32 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO
25 MPH.
RIDGETOP...........SOUTHWEST AROUND 15 MPH WITH GUSTS
TO 25 MPH.
MIXING HEIGHT.......INCREASING TO 5400 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH.
SMOKE DISPERSAL.....POOR (20800 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (76600 KNOT-FT) IN THE
AFTERNOON.
TIME (MDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........44 44 32 32 32 20 20 20
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0
TEMP............48 51 52 54 55 55 54 53
RH..............55 47 39 34 31 29 31 34
20 FT WIND DIR..S S SW SW SW SW SW SW
20 FT WIND SPD..11 12 13 15 15 15 14 12
20 FT WIND GUST.18 19 22 24 25 25 23 21
SDSP KT-FT/1000.22 36 52 67 77 75 56 34
FRIDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....40-44.
MAX HUMIDITY........52-56 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 15 MPH. GUSTS UP TO 25 MPH
IN THE LATE EVENING AND OVERNIGHT.
RIDGETOP...........SOUTHWEST 10 TO 15 MPH.
MIXING HEIGHT.......DECREASING TO 400 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTHWEST 13 TO 16 MPH.
SMOKE DISPERSAL.....POOR (17400 KNOT-FT EARLY IN THE EVENING
DECREASING TO 5000 KNOT-FT LATE IN THE NIGHT).
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........22 22 22 11 11 11 6 6 6 6 6 6
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............52 49 47 45 45 45 46 46 45 44 44 43
RH..............37 42 46 49 49 48 47 47 49 50 52 53
20 FT WIND DIR..SW SW SW S S S SW SW SW SW SW SW
20 FT WIND SPD..11 10 10 11 12 12 14 14 14 12 11 11
20 FT WIND GUST.18 17 16 18 18 18 23 24 22 19 16 16
SDSP KT-FT/1000.17 11 8 7 7 8 9 8 8 7 6 5
SATURDAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....52-56.
MIN HUMIDITY........34-38 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 10 TO 20 MPH WITH GUSTS TO
UP TO 35 MPH.
RIDGETOP...........SOUTHWEST AROUND 20 MPH WITH GUSTS TO 35 MPH.
MIXING HEIGHT.......INCREASING TO 7200 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH INCREASING TO 25
MPH EARLY IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (6400 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (159400 KNOT-FT) IN THE
AFTERNOON IN THE MORNING AND EARLY AFTERNOON.
TIME (MDT) 6 AM 9 AM NOON 3 PM
SKY (%).........18 22 15 19
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CHC OF LTNG (%).0 0 0 0
TEMP............42 46 51 54
RH..............54 49 41 36
20 FT WIND......SW 10G16 SW 13G20 SW 17G29 SW 15G30
SDSP KT-FT/1000.7 30 122 159
FORECASTER...MATOS
REQUESTED BY...JON WARDER
TYPE OF REQUEST...PRESCRIBED
.TAG 2622420.0/BYZ
.DELDT 09/23/26
.FORMATTERVERSION 2.0.0
.EMAIL JONATHAN.WARDER@USDA.GOV,JONATHAN.STONELAKE@USDA.GOV
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