776
FNUS75 KBYZ 012252
FWSBYZ
SPOT FORECAST FOR SWAMP CREEK...UNITED STATES FOREST SERVICE
NATIONAL WEATHER SERVICE BILLINGS MT
352 PM MST MON DEC 1 2025
FORECAST IS BASED ON IGNITION TIME OF 0600 MST ON DECEMBER 02.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS OR CONCERNS WITH
THIS FORECAST.
DISCUSSION
AN APPROACHING CLIPPER SYSTEM FROM THE NORTH WILL BRING BREEZY
NORTHWEST WINDS (GUSTS 20-25 MPH) ON TUESDAY THEN ACCUMULATING
SNOWFALL IN THE LATE AFTERNOON AND NIGHT. SCATTERED SNOW SHOWERS
MAY PERIODICALLY REDUCE VISIBILITY IN THE MORNING, BUT AFTER 3PM
SNOW WILL INTENSIFY, BRINGING LOWER VISIBILITY AND CEILINGS (I.E.
MOUNTAINS WILL BECOME OBSCURED). EXPECT SNOW TO TAPER OFF EARLY
WEDNESDAY AFTER 2-4 INCHES OF ACCUMULATION.
TUESDAY
SKY/WEATHER.........INCREASING CLOUDS. SCATTERED SNOW SHOWERS IN
THE MORNING, THEN SNOW LIKELY IN THE AFTERNOON.
CWR.................20 PERCENT.
MAX TEMPERATURE.....30-34.
MIN HUMIDITY........56-60 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT DOWNSLOPE/DOWNVALLEY 3-7 MPH EARLY, THEN
WEST TO NORTHWEST 8-12 MPH GUSTING TO 20 MPH
IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 2500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST TO NORTHWEST 15 MPH.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........76 80 75 67 73 70 80 83 88 89 92 91
WEATHER COV.....ISO SCT SCT SCT SCT SCT SCT SCT SCT LKY LKY LKY
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
TEMP............23 23 22 26 30 31 32 32 31 29 26 23
RH..............79 80 77 71 63 58 60 66 73 80 87 92
20 FT WIND DIR..VRB VRB VRB W W NW NW NW NW NW NW NW
20 FT WIND SPD..4 4 5 8 7 7 8 8 9 10 11 11
20 FT WIND GUST.8 8 8 11 11 12 13 14 15 18 20 19
TUESDAY NIGHT
SKY/WEATHER.........CLOUDY WITH OCCASIONAL SNOW. SNOW ACCUMULATION
2 TO 4 INCHES.
CWR.................50 PERCENT.
MIN TEMPERATURE.....7-11.
MAX HUMIDITY........GREATER THAN 90 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTH TO NORTHEAST 6-12 MPH. GUSTS UP TO 18
MPH UNTIL 2AM.
MIXING HEIGHT.......DECREASING TO 700 FT AGL OVERNIGHT.
TRANSPORT WINDS.....NORTHWEST 12 MPH.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........98 98 97 96 96 95 95 95 91 86 83 81
WEATHER COV.....DEF DEF DEF DEF DEF DEF LKY LKY LKY LKY LKY CHC
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
TEMP............20 20 20 19 18 17 16 15 14 12 10 9
RH..............94 94 94 94 94 94 93 91 89 88 88 85
20 FT WIND DIR..NW N NE NE NE NE NE N N N N NW
20 FT WIND SPD..10 9 9 9 10 10 10 10 10 8 8 6
20 FT WIND GUST.18 18 18 17 16 16 16 17 16 13 12 11
WEDNESDAY
SKY/WEATHER.........DECREASING CLOUDS. SCATTERED SNOW SHOWERS IN
THE MORNING.
CWR.................5 PERCENT.
MAX TEMPERATURE.....22-26.
MIN HUMIDITY........58-62 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTHWEST 5-10 MPH WITH GUSTS TO 15 MPH.
MIXING HEIGHT.......INCREASING TO 3000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....NORTHWEST 13 MPH.
TIME (MST) 6 AM 9 AM NOON 3 PM
SKY (%).........80 78 61 45
WEATHER COV.....SCT SCT
WEATHER TYPE....SNOW SNOW NONE NONE
TSTM COV........
TEMP............9 12 21 24
RH..............90 83 66 60
20 FT WIND......NW 7G12 NW 6G13 NW 8G15 N 8G15
FORECASTER...LESTER
REQUESTED BY...JAMES DIAZ
TYPE OF REQUEST...PRESCRIBED
.TAG 2526806.0/BYZ
.DELDT 12/01/25
.FORMATTERVERSION 2.0.0
.EMAIL JAMES.DIAZ@USDA.GOV
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