273
FNUS75 KBOU 041109
FWSBOU
SPOT FORECAST FOR FAIR RX...USFS
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
409 AM MST THU DEC 4 2025
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
CLOUDS AND EVEN A COUPLE FLURRIES WERE TRAPPED IN
MIDDLE PARK AND MUCH OF GRAND COUNTY THIS MORNING. DAYTIME HEATING
WILL ATTEMPT TO BREAK THESE CLOUDS UP, BUT OVERALL SMOKE
DISPERSAL MAY BE LATER TO IMPROVE. HOWEVER, WITH WESTERLY WINDS
INCREASING, WE EXPECT AT LEAST FAIR SMOKE DISPERSION BY THIS
AFTERNOON.
WINDS ALOFT WILL CONTINUE TO INCREASE ON FRIDAY. THERE WILL ALSO
BE LIGHT SNOW MOVING INTO THE AREA LATE TONIGHT AND FRIDAY. BOTH
OF THOSE ELEMENTS TOGETHER WILL SUPPORT FAIR TO GOOD SMOKE
DISPERSION FOR FRIDAY. HEAVIER SNOWFALL IS EXPECTED TO DEVELOP
LATE FRIDAY NIGHT AND CONTINUE THROUGH SATURDAY.
TODAY
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) UNTIL 1200, THEN
PARTLY CLOUDY (40-50 PERCENT) UNTIL 1500, THEN
MOSTLY CLOUDY (55-65 PERCENT). PATCHY FOG UNTIL
1000.
CWR.................3 PERCENT.
CHANCE OF PCPN......10 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 26.
MIN HUMIDITY........50 PERCENT.
WIND (20 FT)........WEST WINDS 6 TO 12 MPH.
MIXING HEIGHT.......3100 FT AGL.
TRANSPORT WINDS.....WEST 8 TO 17 MPH UNTIL 1200. AROUND 13 MPH
AFTER 1700.
SMOKE DISPERSAL.....POOR UNTIL 1200, THEN FAIR UNTIL 1600,
THEN POOR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........64 59 60 55 53 45 42 47 47 52 61 65
WEATHER COV.....PTY PTY PTY PTY
WEATHER TYPE....FOG FOG FOG FOG
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).10 10 10 10 10 10 10 10 10 10 10 10
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............8 8 9 12 15 19 23 25 26 25 23 19
RH..............83 83 83 76 73 62 54 50 50 50 54 64
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..5 5 6 6 7 9 10 12 12 12 12 10
20 FT WIND GUST.7 7 9 9 12 15 16 18 18 18 18 16
MIX HGT (KFT)...1.2 1.3 1.5 2.0 2.6 3.2 3.7 3.9 3.9 3.4 2.3 1.6
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.8 8 8 12 15 17 21 23 23 22 17 13
VRATE KT-FT/1K..9 9 10 20 28 39 52 58 78 65 35 18
SMOKEDISPERSION.P P P P P P F F G G P P
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT) UNTIL 2200, THEN
PARTLY CLOUDY (45-55 PERCENT) UNTIL 2300, THEN
MOSTLY CLOUDY (70-80 PERCENT). CHANCE OF SNOW
AFTER 2300 UNTIL 0500, THEN SNOW LIKELY.
CWR.................7 PERCENT.
CHANCE OF PCPN......60 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 11.
MAX HUMIDITY........87 PERCENT.
WIND (20 FT)........WEST WINDS 7 TO 12 MPH.
MIXING HEIGHT.......1300 FT AGL.
TRANSPORT WINDS.....WEST 11 TO 16 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........63 57 53 56 50 57 59 61 68 75 82 89
WEATHER COV..... CHC CHC CHC CHC CHC CHC LKY
WEATHER TYPE.... SN SN SN SN SN SN SN
TSTM COV........
CWR.............0 0 0 0 0 10 10 10 10 10 10 10
CHC OF PCPN (%).10 10 10 10 10 30 30 30 40 40 40 60
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............16 14 14 13 12 11 11 11 11 12 13 13
RH..............73 80 73 76 76 80 76 80 80 76 76 80
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..10 10 10 10 10 10 10 9 9 9 9 9
20 FT WIND GUST.16 16 16 16 16 16 16 15 15 15 15 15
MIX HGT (KFT)...1.4 1.4 1.4 1.3 1.3 1.3 1.3 1.4 1.4 1.4 1.5 1.5
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.13 14 13 13 13 12 12 12 12 13 13 14
VRATE KT-FT/1K..16 17 15 14 13 13 13 14 14 15 17 18
SMOKEDISPERSION.P P P P P P P P P P P P
FRIDAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). SNOW LIKELY
UNTIL 1700, THEN CHANCE OF SNOW.
CWR.................7 PERCENT INCREASING TO 20 PERCENT LATE IN THE
AFTERNOON.
CHANCE OF PCPN......70 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 26.
MIN HUMIDITY........71 PERCENT.
WIND (20 FT)........WEST WINDS 8 TO 13 MPH.
MIXING HEIGHT.......3100 FT AGL.
TRANSPORT WINDS.....WEST 13 TO 21 MPH UNTIL 1300, THEN 16 TO 24
MPH.
SMOKE DISPERSAL.....POOR UNTIL 1100, THEN FAIR UNTIL 1300, THEN
GOOD UNTIL 1500, THEN FAIR UNTIL 1600, THEN
POOR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........90 91 92 91 89 87 85 83 81 81 82 83
WEATHER COV.....LKY LKY LKY LKY LKY LKY LKY LKY LKY LKY LKY CHC
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
CWR.............10 10 10 10 10 10 10 10 10 10 10 20
CHC OF PCPN (%).60 60 60 60 60 70 70 70 70 70 70 40
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............12 12 13 16 19 23 25 26 26 25 25 24
RH..............87 87 87 88 84 74 74 71 71 74 71 74
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..8 8 8 9 10 12 12 12 12 12 12 12
20 FT WIND GUST.13 13 14 15 16 18 18 18 18 18 18 18
MIX HGT (KFT)...1.6 1.7 1.8 2.1 2.4 2.8 3.0 3.3 3.5 3.0 2.4 1.9
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.14 13 13 15 17 20 21 23 24 22 18 16
VRATE KT-FT/1K..19 19 20 28 37 47 55 64 74 56 40 26
SMOKEDISPERSION.P P P P P F F G G F P P
FORECAST DAYS 3 THROUGH 7
SATURDAY
SNOW. PATCHY BLOWING SNOW AFTER 0600. LOWS AROUND 18. HIGHS IN
THE UPPER 20S. WEST WINDS AROUND 16 MPH.
SUNDAY
MOSTLY CLOUDY WITH SNOW LIKELY. LOWS AROUND 15. HIGHS IN THE MID
20S. WEST WINDS AROUND 11 MPH.
MONDAY
MOSTLY CLOUDY. CHANCE OF SNOW. LOWS AROUND 11. HIGHS IN THE LOWER
30S. WEST WINDS AROUND 11 MPH.
TUESDAY
MOSTLY CLOUDY WITH SLIGHT CHANCE OF SNOW. LOWS AROUND 17. HIGHS
IN THE MID 30S.
WEDNESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. LOWS IN THE LOWER 20S. HIGHS
IN THE UPPER 30S.
FORECASTER...BARJENBRUCH
REQUESTED BY...BENJAMIN TIMOCK
TYPE OF REQUEST...PRESCRIBED
.TAG 2527003.0/BOU
.DELDT 12/04/25
.FORMATTERVERSION 2.0.0
.EMAIL BENJAMIN.TIMOCK@USDA.GOV
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