019
FNUS75 KBYZ 091218
FWSBYZ
SPOT FORECAST FOR HI LINE...USWFS
NATIONAL WEATHER SERVICE BILLINGS MT
618 AM MDT THU APR 9 2026
FORECAST IS BASED ON IGNITION TIME OF 1400 MDT ON APRIL 10.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
HIGH PRESSURE WILL BE OVER THE REGION FRIDAY LEADING TO MOSTLY
SUNNY SKIES AND WARM TEMPS. SOUTHEAST WINDS WILL PREVAIL AT 10-15
MPH WITH GUSTS 20-25 MPH AT TIMES. HUMIDITY SHOULD REMAIN ABOVE
25%. GOOD RH RECOVERIES ARE EXPECTED FRIDAY NIGHT AS WINDS REMAIN
SOUTHERLY. SATURDAY WILL BE QUITE WARM AHEAD OF AN APPROACHING WEATHER
SYSTEM OUT WEST. HIGHS NEAR 80 ARE EXPECTED AT THE BURN SITE. IT
APPEARS DRIER AIR WILL ENCROACH FROM THE SOUTH DROPPING RH
READINGS AS LOW AS THE UPPER TEENS. WINDS WILL REMAIN SOMEWHAT
ELEVATED FROM THE SOUTH/SOUTHWEST. THERE IS A 15% CHANCE OF A
SHOWER, POSSIBLY WITH SOME THUNDER, LATE SATURDAY (AFTER 4PM) INTO
SATURDAY EVENING. THE CHANCE OF WETTING RAIN REMAINS LOW UNTIL
LATE SUNDAY AND MONDAY. BT
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....64-68.
MIN HUMIDITY........28-33 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHEAST WINDS 9 TO 14 MPH WITH GUSTS TO
AROUND 23 MPH.
RIDGETOP...........SOUTHWEST AROUND 17-25 MPH.
MIXING HEIGHT.......3400 FT AGL EARLY IN THE MORNING INCREASING TO
4100 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 24 TO 25 MPH.
TIME (MDT) 2 PM 5 PM
SKY (%).........36 45
WEATHER COV.....
WEATHER TYPE....NONE NONE
TSTM COV........
TEMP............63 66
RH..............34 30
20 FT WIND......SE 14G24 SE 15G24
FRIDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.
CWR.................0 PERCENT.
MIN TEMPERATURE.....43-47.
MAX HUMIDITY........72-76 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHEAST WINDS 6 TO 13 MPH WITH GUSTS TO
AROUND 19 MPH.
RIDGETOP...........SOUTHWEST AROUND 20 MPH.
MIXING HEIGHT.......3000 FT AGL EARLY IN THE EVENING DECREASING TO
600 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTH 16 TO 25 MPH.
TIME (MDT) 6 PM 9 PM MIDNGT 3 AM
SKY (%).........52 63 53 49
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
TEMP............65 56 53 48
RH..............33 47 59 69
20 FT WIND......SE 13G21 SE 11G20 S 11G19 S 10G17
SATURDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................2 PERCENT.
CHANCE OF LIGHTNING.7 PERCENT.
MAX TEMPERATURE.....76-80.
MIN HUMIDITY........17-21 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTH/SOUTHWEST WINDS 8 TO 13MPH. GUSTS UP TO 22 MPH
LATE IN THE AFTERNOON.
RIDGETOP...........WEST AROUND 15-20 MPH.
MIXING HEIGHT.......200 FT AGL EARLY IN THE MORNING INCREASING TO
10000 FT AGL IN THE AFTERNOON INCREASING TO
6000 FT AGL EARLY IN THE MORNING INCREASING TO
10900 FT AGL IN THE AFTERNOON LATE IN THE
AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 10 TO 16 MPH.
TIME (MDT) 6 AM 9 AM NOON 3 PM
SKY (%).........47 50 39 34
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CHC OF LTNG (%).0 0 0 10
TEMP............46 53 73 78
RH..............73 54 28 21
20 FT WIND......S 8G14 S 8G14 SW 8G14 SW 9G16
FORECASTER...TESAR
REQUESTED BY...JARID GIBSON
TYPE OF REQUEST...PRESCRIBED
.TAG 2609199.0/BYZ
.DELDT 04/09/26
.FORMATTERVERSION 2.0.0
.EMAIL JGIBSON@BLM.GOV
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