424
FNUS75 KBYZ 181121
FWSBYZ
SPOT FORECAST FOR BIG GOOSE CYN HELICOPTER...USDA FOREST SERVICE
NATIONAL WEATHER SERVICE BILLINGS MT
521 AM MDT THU JUN 18 2026
FORECAST IS BASED ON FORECAST START TIME OF 0800 MDT ON JUNE 18.
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 TODAY. SCATTERED SHOWERS AND
THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE MONTANA PLAINS IN
THE AFTERNOON, BUT SHOULD STAY NORTH OF THE ACTIVITY SITE. THAT
SAID, MODELS HINT AT SOME OUTFLOW FROM THE THUNDERSTORMS PUSHING
INTO THE BIG HORNS LATE TODAY. THIS MAY CAUSE NORTHERLY WINDS TO
PICK UP SOME AND TURN MORE GUSTY AT THE SITE. THERE IS ABOUT A 35%
CHANCE OF SEEING GUSTS 20+ MPH AT THE SITE THIS AFTERNOON. BT
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY.
CHANCE OF PCPN......5 PERCENT.
MAX TEMPERATURE.....55-59.
MIN HUMIDITY........33-39 PERCENT.
SURFACE WINDS (MPH).GENERALLY LIGHT WINDS BECOMING NORTH UP TO 10 MPH WITH
GUSTS TO AROUND 21 MPH IN THE LATE MORNING AND
AFTERNOON.
RIDGETOP...........WEST AROUND 10-15 MPH. TURNING W-NW IN THE AFTERNOON WITH OCCASIONAL
GUSTS TO AROUND 20 MPH POSSIBLE (35% CHC).
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........21 33 46 60 58 60 49 58 44 45
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0
TEMP............42 45 49 50 51 53 55 56 56 56
RH..............58 50 48 50 49 46 43 40 42 43
SURFACE WND DIR.W NW N N N N N NW NW NW
SURFACE WND SPD.5 6 8 6 8 8 8 9 9 11
SURFACE WND GST.9 14 15 15 16 17 19 19 20 21
FORECASTER...TESAR
REQUESTED BY...JON WARDER
TYPE OF REQUEST...OTHER
.TAG 2615652.2/BYZ
.DELDT 06/18/26
.FORMATTERVERSION 2.0.0
.EMAIL JONATHAN.WARDER@USDA.GOV
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