801
FNUS75 KCYS 041300
FWSCYS
SPOT FORECAST FOR WHITE ROCKS HAND PILES...USFS
NATIONAL WEATHER SERVICE CHEYENNE WY
600 AM MST THU DEC 4 2025
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE AT (307) 772-2227
DISCUSSION
PRECIPITATION IS UNLIKELY DURING THE DAY TODAY, HOWEVER, STRONG WINDS
ARE EXPECTED. A HIGH TEMPERATURE AROUND 20 IS FORECAST WITH A MINIMUM
RELATIVE HUMIDITY NEAR 55 PERCENT. WEST WINDS AT 30 MPH WITH GUSTS TO
55 MPH ARE POSSIBLE. SNOW WILL RETURN THURSDAY NIGHT WITH ACCUMULATIONS
OF 3 TO 4 INCHES POSSIBLE. STRONG WINDS WILL CONTINUE OVERNIGHT. WINDS
WILL FINALLY WEAKEN DURING THE DAY FRIDAY, HOWEVER, SNOW SHOWERS WITH
ACCUMULATING SNOW ARE STILL LIKELY.
TODAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT). AREAS OF BLOWING
SNOW EARLY IN THE MORNING. PATCHY BLOWING SNOW
LATE IN THE MORNING, THEN AREAS OF BLOWING SNOW
LATE IN THE AFTERNOON. CHANCE OF SNOW LATE IN
THE AFTERNOON.
CWR.................5 PERCENT.
MAX TEMPERATURE.....AROUND 21.
MIN HUMIDITY........56 PERCENT.
WIND (20 FT)........BREEZY. WEST WINDS 17 TO 26 MPH WITH GUSTS TO
AROUND 51 MPH INCREASING TO 26 TO 28 MPH WITH
GUSTS TO AROUND 51 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......2500 FT AGL.
TRANSPORT WINDS.....WEST 25 TO 31 MPH INCREASING TO 33 TO 38 MPH IN
THE LATE MORNING AND AFTERNOON.
SMOKE DISPERSAL.....POOR (12100 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (78900 KNOT-FT) IN THE
AFTERNOON.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........29 29 32 29 38 44 47 52 51 53 50 45
WEATHER COV..... ARS ARS ARS PTY PTY PTY PTY PTY PTY CHC
WEATHER TYPE.... BSN BSN BSN BSN BSN BSN BSN BSN BSN SN
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 10
TEMP............3 5 10 14 18 20 20 21 21 20 17 14
RH..............100 100 80 70 59 56 59 59 59 64 70 84
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..17 21 24 24 24 24 25 25 26 28 28 26
20 FT WIND GUST.33 39 44 46 46 46 47 48 51 51 51 51
MIX HGT (KFT)...0.6 0.6 1.0 1.7 1.8 2.3 2.5 2.4 2.4 1.9 1.6 0.9
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.25 30 31 37 36 37 37 37 37 37 38 33
SDSPL KT-FT/100012 16 27 53 55 72 79 78 76 61 54 27
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING
MOSTLY CLOUDY (65-75 PERCENT). BLOWING SNOW.
CHANCE OF SNOW IN THE EVENING. SNOW LIKELY LATE
IN THE EVENING.
CWR.................5 PERCENT INCREASING TO 47 PERCENT LATE IN THE
EVENING.
MIN TEMPERATURE.....AROUND 11.
MAX HUMIDITY........100 PERCENT.
WIND (20 FT)........BREEZY. WEST WINDS 21 TO 25 MPH. GUSTS UP TO 48
MPH DECREASING TO 38 MPH EARLY IN THE MORNING.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....WEST 36 TO 38 MPH.
SMOKE DISPERSAL.....POOR (14600 KNOT-FT).
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........41 46 57 60 73 80 83 82 82 84 84 85
WEATHER COV.....CHC CHC CHC CHC CHC DEF DEF DEF DEF DEF DEF LKY
WEATHER TYPE....SN SN SN SN SN BSN BSN BSN BSN BSN BSN SN
TSTM COV........
CWR.............10 10 10 10 10 50 50 50 50 50 50 40
TEMP............13 11 13 11 13 13 11 13 13 13 11 11
RH..............84 91 84 96 87 91 100 96 96 96 100 100
20 FT WIND DIR..W W SW W W W W W W W W W
20 FT WIND SPD..25 25 24 23 23 23 23 23 23 22 21 21
20 FT WIND GUST.48 46 45 44 44 44 44 44 44 43 40 38
MIX HGT (KFT)...1.1 0.6 0.5 0.7 0.9 1.0 1.0 1.0 1.1 1.1 1.1 0.8
TRANSP WIND DIR.SW SW W SW W W W W W W W W
TRANSP WIND SPD.36 36 36 37 38 38 38 38 38 38 37 36
SDSPL KT-FT/100035 18 15 22 28 32 34 34 35 36 37 24
FRIDAY
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). AREAS OF BLOWING
SNOW IN THE MORNING, THEN PATCHY BLOWING SNOW
LATE IN THE MORNING. SNOW LIKELY IN THE
MORNING, THEN CHANCE OF SNOW LATE IN THE
MORNING. SNOW LIKELY LATE IN THE AFTERNOON.
CWR.................39 PERCENT DECREASING TO 25 PERCENT LATE IN THE
MORNING, THEN INCREASING TO 36 PERCENT LATE IN
THE AFTERNOON.
MAX TEMPERATURE.....AROUND 26.
MIN HUMIDITY........65 PERCENT.
WIND (20 FT)........WEST WINDS 16 TO 20 MPH WITH GUSTS TO AROUND 37
MPH.
MIXING HEIGHT.......2400 FT AGL.
TRANSPORT WINDS.....WEST 30 TO 38 MPH.
SMOKE DISPERSAL.....POOR (35700 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (64800 KNOT-FT) IN THE
AFTERNOON.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........85 85 81 79 76 73 73 74 75 75 75 74
WEATHER COV.....LKY LKY LKY LKY LKY CHC CHC CHC CHC CHC CHC LKY
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
CWR.............40 40 40 40 40 30 30 30 30 30 30 40
TEMP............11 11 17 20 22 24 25 26 25 23 21 19
RH..............100 100 84 77 74 68 68 65 71 77 84 92
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..20 18 18 17 16 16 16 16 16 16 16 16
20 FT WIND GUST.37 35 33 32 31 30 30 30 30 30 30 31
MIX HGT (KFT)...1.2 1.5 1.7 1.8 2.0 2.2 2.3 2.4 2.4 2.1 1.8 1.4
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.36 36 38 36 35 33 32 31 30 30 31 32
SDSPL KT-FT/100036 47 57 56 59 62 65 65 61 55 48 40
FORECASTER...FULLER
REQUESTED BY...PARKER JOHNSON
TYPE OF REQUEST...PRESCRIBED
.TAG 2527010.0/CYS
.DELDT 12/04/25
.FORMATTERVERSION 2.0.0
.EMAIL PARKER.JOHNSON@USDA.GOV
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