905
FNUS75 KBOU 030020
FWSBOU

Spot Forecast for Fair RX...USFS
National Weather Service Denver/Boulder CO
520 PM MST Tue Dec 2 2025

If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION... Snow is likely throughout most of the day on
Wednesday. Snow amounts throughout the event will be 3-6".
Persistent east winds are expected with gusts up to 15 mph. There
will be enough wind along with high enough vent rates to get a
couple hours of fair smoke dispersal.

Snow will come to an end Wednesday evening with dry conditions
expected on Thursday. Winds will increase with gusts up to 25 mph
and there will be good to very good smoke dispersal.


.WEDNESDAY...

Sky/weather.........Mostly cloudy (80-90 percent). Snow until 1700,
                    then chance of snow.
CWR.................5 percent.
Chance of pcpn......100 percent.
Chance of thunder...5 percent.
Max temperature.....Around 24.
Min humidity........61 percent.
Wind (20 ft)........East winds 5 to 7 mph.
Mixing height.......3400 ft AGL.
Transport winds.....East 8 to 14 mph.
Smoke dispersal.....Poor until 1000, then fair until 1300, then
                    poor.

TIME (MST)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........97  97  96  96  96  95  95  93  91  86  86  74
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.............0   0   0   0   0   0   0   0   0   0   0   10
Chc of pcpn (%).100 100 90  90  90  90  90  90  80  80  80  40
Chc of thdr (%).0   0   0   0   0   10  10  10  0   0   0   0
Temp............16  15  16  17  20  22  24  24  24  23  22  13
RH..............93  90  90  86  80  73  66  66  66  64  61  91
20 FT wind dir..E   E   E   E   E   E   E   E   E   E   E   E
20 FT wind spd..3   3   5   5   6   7   7   7   6   6   5   5
20 FT wind gust.6   6   7   7   9   12  12  12  9   9   7   7
Mix hgt (kft)...2.2 2.2 2.5 3.0 3.5 3.9 4.2 4.4 4.1 3.6 2.4 2.0
Transp wind dir.SE  E   E   E   E   E   E   E   E   E   E   E
Transp wind spd.8   12  13  13  14  13  13  10  10  12  12  12
Vrate kt-ft/1K..15  22  28  33  42  43  46  39  37  36  24  20
SmokeDispersion.P   P   P   P   F   F   F   P   P   P   P   P

.WEDNESDAY NIGHT...

Sky/weather.........Mostly cloudy (55-65 percent) until 2300, then
                    partly cloudy (35-45 percent). Chance of snow
                    until 2300.
CWR.................7 percent.
Chance of pcpn......40 percent.
Chance of thunder...0 percent.
Min temperature.....Around 3 above.
Max humidity........96 percent.
Wind (20 ft)........East winds around 5 mph until 2000, then
                    variable up to 5 mph.
Mixing height.......1700 ft AGL.
Transport winds.....East 8 to 13 mph until 2300, then light until
                    2400, then southwest 8 to 11 mph until 0200,
                    then west.
Smoke dispersal.....Poor.

TIME (MST)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........67  68  53  53  53  28  30  32  34  39  44  49
Weather cov.....CHC CHC CHC CHC CHC
Weather type....SN  SN  SN  SN  SN
Tstm cov........
CWR.............10  10  10  10  10  0   0   0   0   0   0   0
Chc of pcpn (%).40  40  30  30  30  10  10  10  10  10  10  10
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............10  10  10  11  9   8   8   6   6   5   5   4
RH..............96  91  87  80  83  83  79  83  83  87  83  87
20 FT wind dir..E   SE  SE  SE  S   S   SW  SW  W   W   W   W
20 FT wind spd..3   3   2   2   2   2   2   2   2   2   3   3
20 FT wind gust.6   6   3   3   3   3   3   3   3   3   6   6
Mix hgt (kft)...1.8 1.9 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7
Transp wind dir.E   E   E   SE  SE  S   SW  SW  W   W   W   W
Transp wind spd.12  12  10  8   8   7   8   8   8   8   8   8
Vrate kt-ft/1K..18  19  15  12  12  10  12  12  12  12  12  12
SmokeDispersion.P   P   P   P   P   P   P   P   P   P   P   P

.THURSDAY...

Sky/weather.........Mostly cloudy (50-60 percent) until 0900, then
                    partly cloudy (30-40 percent) until 1300, then
                    mostly sunny (20-30 percent) until 1500, then
                    partly cloudy (35-45 percent).
CWR.................3 percent.
Chance of pcpn......10 percent.
Chance of thunder...0 percent.
Max temperature.....Around 26.
Min humidity........55 percent.
Wind (20 ft)........West winds 6 to 12 mph with gusts to around 24
                    mph.
Mixing height.......3600 ft AGL.
Transport winds.....West 8 to 16 mph until 1100, then 18 to 26 mph
                    until 1700, then around 15 mph.
Smoke dispersal.....Poor until 1000, then fair until 1100, then
                    good until 1400, then very good until 1500,
                    then good until 1600, then fair until 1700,
                    then poor.

TIME (MST)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........51  53  55  46  36  27  26  24  23  30  38  45
Weather cov.....
Weather type....
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............3   3   5   10  17  22  25  26  26  25  24  21
RH..............91  91  91  83  70  65  60  57  55  55  57  62
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..3   3   5   6   8   10  13  14  15  15  14  13
20 FT wind gust.6   6   7   9   13  16  21  22  24  24  22  21
Mix hgt (kft)...1.7 1.7 1.7 2.4 3.2 3.9 4.1 4.2 4.4 3.6 2.8 2.1
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.8   9   9   13  16  20  22  24  26  23  18  15
Vrate kt-ft/1K..13  13  14  27  44  66  77  89  101 71  46  27
SmokeDispersion.P   P   P   P   F   G   G   G   VG  G   F   P

$$
Forecaster...Danielson
Requested by...Benjamin Timock
Type of request...PRESCRIBED
.TAG 2526922.0/BOU
.DELDT 12/02/25
.FormatterVersion 2.0.0
.EMAIL benjamin.timock@usda.gov