446
FNUS75 KBOU 051102
FWSBOU
SPOT FORECAST FOR FAIR RX HAND PILES...USFS
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
402 AM MST FRI DEC 5 2025
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
MODERATE SNOW IS EXPECTED TO FORM IN THE MORNING
HOURS AND WILL CONTINUE FOR MOST OF THE DAY. AFTER A BRIEF BREAK
IN THE SNOW THIS EVENING, MODERATE TO HEAVY SNOW WILL DEVELOP
FRIDAY NIGHT AND WILL LAST THROUGH SATURDAY NIGHT. STORM TOTAL
ACCUMULATION WILL BE BETWEEN 7-14".
MODERATE WESTERLY WINDS WILL GUST UP TO 25 MPH TODAY. THIS WILL
HELP INCREASE THE VENT RATE AND GOOD SMOKE DISPERSAL IS EXPECTED.
SATURDAY WILL BE WINDIER WITH GUSTS UP TO 40 MPH. EXCELLENT SMOKE
DISPERSAL IS EXPECTED SATURDAY.
TODAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). SNOW LIKELY
UNTIL 1600, THEN CHANCE OF SNOW.
CWR.................14 PERCENT INCREASING TO 18 PERCENT IN THE
AFTERNOON.
CHANCE OF PCPN......70 PERCENT.
CHANCE OF THUNDER...3 PERCENT.
MAX TEMPERATURE.....AROUND 28.
MIN HUMIDITY........69 PERCENT.
WIND (20 FT)........WEST WINDS 7 TO 14 MPH. GUSTS UP TO 22 MPH IN
THE AFTERNOON.
MIXING HEIGHT.......4000 FT AGL.
TRANSPORT WINDS.....WEST 16 TO 25 MPH UNTIL 1300, THEN 24 TO 29 MPH
UNTIL 1700, THEN AROUND 18 MPH.
SMOKE DISPERSAL.....POOR UNTIL 0900, THEN FAIR UNTIL 1000, THEN
GOOD UNTIL 1300, THEN VERY GOOD UNTIL 1400,
THEN GOOD UNTIL 1700, THEN FAIR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........78 82 86 81 80 81 79 82 82 82 85 91
WEATHER COV.....LKY LKY LKY LKY LKY LKY LKY LKY LKY LKY CHC 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 20 20 20 20 10
CHC OF PCPN (%).70 70 70 70 70 70 70 70 60 60 50 40
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............14 13 14 18 22 24 27 28 28 28 26 24
RH..............81 86 87 84 82 77 70 69 73 70 73 78
20 FT WIND DIR..NW NW W W W W W W W W W W
20 FT WIND SPD..8 7 7 7 8 10 13 13 14 14 14 13
20 FT WIND GUST.13 12 12 12 13 16 21 21 22 22 22 21
MIX HGT (KFT)...2.0 2.1 2.3 2.9 3.3 3.7 4.0 4.3 4.3 3.9 3.6 2.7
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.17 16 16 22 23 24 25 28 26 25 24 18
VRATE KT-FT/1K..31 29 33 56 66 78 89 104 98 86 76 44
SMOKEDISPERSION.P P P F G G G VG G G G F
TONIGHT
SKY/WEATHER.........CLOUDY (85-95 PERCENT). CHANCE OF SNOW UNTIL
2000, THEN SNOW LIKELY UNTIL 2300, THEN SNOW.
CWR.................14 PERCENT INCREASING TO 84 PERCENT.
CHANCE OF PCPN......90 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 15.
MAX HUMIDITY........100 PERCENT.
WIND (20 FT)........WEST WINDS 11 TO 16 MPH WITH GUSTS TO AROUND 24
MPH.
MIXING HEIGHT.......2100 FT AGL.
TRANSPORT WINDS.....WEST 16 TO 24 MPH UNTIL 0200, THEN 27 TO 32
MPH.
SMOKE DISPERSAL.....POOR UNTIL 2000, THEN FAIR UNTIL 2100, THEN
POOR UNTIL 2400, THEN FAIR UNTIL 0200, THEN
GOOD.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........86 87 88 88 86 84 84 84 86 87 91 95
WEATHER COV.....CHC CHC LKY LKY LKY DEF DEF DEF DEF DEF DEF DEF
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
CWR.............10 10 10 10 10 60 60 60 60 60 60 80
CHC OF PCPN (%).40 40 60 60 60 80 80 80 80 80 80 90
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............23 20 20 19 18 17 16 18 18 19 19 20
RH..............79 90 86 97 97 98 100 95 99 99 100 99
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..13 13 13 13 13 13 14 14 14 15 15 12
20 FT WIND GUST.21 21 21 21 21 21 22 22 22 24 24 23
MIX HGT (KFT)...2.3 2.0 2.4 2.5 2.5 2.5 2.5 2.8 3.2 3.1 3.0 2.7
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.18 20 20 16 16 16 20 24 29 28 29 31
VRATE KT-FT/1K..37 33 41 35 35 34 42 59 81 75 75 72
SMOKEDISPERSION.P P F P P P F F G G G G
SATURDAY
SKY/WEATHER.........CLOUDY (85-95 PERCENT). SNOW UNTIL 1700. CHANCE
OF SNOW AFTER 1700. PATCHY BLOWING SNOW AFTER
0700.
CWR.................84 PERCENT DECREASING TO 2 PERCENT.
CHANCE OF PCPN......90 PERCENT.
CHANCE OF THUNDER...7 PERCENT.
MAX TEMPERATURE.....AROUND 31.
MIN HUMIDITY........67 PERCENT.
WIND (20 FT)........BREEZY. WEST WINDS 11 TO 19 MPH UNTIL 1100,
THEN 19 TO 27 MPH. GUSTS UP TO 37 MPH.
MIXING HEIGHT.......5200 FT AGL.
TRANSPORT WINDS.....WEST 35 TO 44 MPH UNTIL 1000, THEN 44 TO 54 MPH
UNTIL 1500, THEN 35 TO 40 MPH UNTIL 1700, THEN
AROUND 29 MPH.
SMOKE DISPERSAL.....GOOD UNTIL 0700, THEN VERY GOOD UNTIL 0900,
THEN EXCELLENT UNTIL 1600, THEN VERY GOOD UNTIL
1700, THEN GOOD.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........95 95 98 95 95 94 94 94 94 94 94 78
WEATHER COV.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF CHC
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
CWR.............80 80 80 80 80 30 30 30 30 30 30 0
CHC OF PCPN (%).90 90 90 90 90 90 90 90 90 90 90 50
CHC OF THDR (%).0 0 0 0 0 10 10 10 0 0 0 0
TEMP............20 20 22 24 25 28 29 30 30 29 28 26
RH..............94 94 98 97 97 90 80 74 68 67 69 71
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..12 12 13 15 18 21 23 24 25 24 23 21
20 FT WIND GUST.24 25 28 30 31 33 35 36 37 37 37 36
MIX HGT (KFT)...3.2 3.6 4.1 4.9 5.3 5.7 5.3 5.6 5.9 5.2 4.5 3.8
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.35 39 39 44 47 51 52 48 45 39 35 29
VRATE KT-FT/1K..96 123 141 185 217 251 239 236 231 179 133 94
SMOKEDISPERSION.G VG VG E E E E E E E VG G
FORECASTER...DANIELSON
REQUESTED BY...STEPHAN ARGUINCHONA
TYPE OF REQUEST...PRESCRIBED
.TAG 2527069.0/BOU
.DELDT 12/05/25
.FORMATTERVERSION 2.0.0
.EMAIL STEPHAN.ARGUINCHONA@USDA.GOV
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