035
FNUS75 KBOU 090034
FWSBOU

Spot Forecast for MBRTB Old Park Piles...USFS
National Weather Service Denver/Boulder CO
534 PM MST Mon Dec 8 2025

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

.DISCUSSION...

Winds tomorrow morning will be light around 5 to 10 mph. Southwest
winds will increase slightly for the afternoon, with speeds
around 10 to 15 mph. With the lighter winds and poor mixing
heights, smoke dispersal will be poor both afternoons on Tuesday
and Wednesday. The chance for snow showers will increase late
Tuesday evening, ending Wednesday afternoon. Light snow
accumulations will be possible.

.TUESDAY...

Sky/weather.........Mostly cloudy (60-70 percent). Chance of snow
                    after 1100.
Chance of pcpn......40 percent.
Max temperature.....Around 39.
Min humidity........60 percent.
Wind (20 ft)........Southwest winds 6 to 11 mph.
Mixing height.......Below 1000 FT AGL until 1000, then 1900 ft AGL.
Transport winds.....Southwest 12 to 18 mph.
Smoke dispersal.....Poor.

TIME (MST)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........61  59  58  64  72  73  76  75  74  74  72
Weather cov.....                CHC CHC CHC CHC CHC CHC CHC
Weather type....                SN  SN  SN  SN  SN  SN  SN
Tstm cov........
Chc of pcpn (%).10  10  10  10  30  30  30  30  30  30  40
Temp............21  23  28  30  33  35  37  39  38  37  36
RH..............80  76  70  69  63  63  61  60  64  64  67
20 FT wind dir..SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..7   7   7   7   8   9   9   10  10  10  10
20 FT wind gust.12  12  12  12  13  15  15  16  16  16  16
Mix hgt (kft)...0.7 0.8 0.9 1.2 1.5 1.8 1.9 1.9 1.8 1.7 1.3
Transp wind dir.SW  SW  SW  SW  SW  W   W   W   W   W   W
Transp wind spd.13  13  12  17  17  17  18  18  18  17  14
Vrate kt-ft/1K..8   8   9   18  23  27  30  31  29  26  15
SmokeDispersion.P   P   P   P   P   P   P   P   P   P   P

.TUESDAY NIGHT...

Sky/weather.........Mostly cloudy (75-85 percent). Chance of snow
                    until 2300, then snow likely until 0500, then
                    chance of snow.
Chance of pcpn......60 percent.
Min temperature.....Around 31.
Max humidity........87 percent.
Wind (20 ft)........Southwest winds 9 to 14 mph. Gusts up to 21 mph
                    early in the evening then 25 mph overnight.
Mixing height.......1500 ft AGL until 1900, then Below 1000 FT AGL.
Transport winds.....West 12 to 17 mph.
Smoke dispersal.....Poor.

TIME (MST)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........71  75  80  82  78  82  85  84  83  80  80  80
Weather cov.....CHC CHC CHC CHC CHC LKY LKY LKY LKY LKY LKY CHC
Weather type....SN  SN  SN  SN  SN  SN  SN  SN  SN  SN  SN  SN
Tstm cov........
Chc of pcpn (%).40  40  40  40  40  60  60  60  60  60  60  50
Temp............34  35  34  35  33  33  33  33  34  33  32  32
RH..............75  75  79  77  80  81  82  83  78  81  84  86
20 FT wind dir..SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..12  12  13  13  13  12  12  12  10  10  9   9
20 FT wind gust.18  18  21  21  21  18  17  21  25  25  24  22
Mix hgt (kft)...1.5 0.8 0.8 0.8 0.7 0.7 0.7 0.8 0.8 0.8 0.8 0.7
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.15  15  15  15  15  15  14  14  13  13  14  14
Vrate kt-ft/1K..19  10  10  10  10  9   9   9   9   9   9   9
SmokeDispersion.P   P   P   P   P   P   P   P   P   P   P   P

.WEDNESDAY...

Sky/weather.........Mostly cloudy (70-80 percent). Chance of snow
                    until 1700. Chance of rain after 1400 until
                    1700, then slight chance of rain and snow.
Chance of pcpn......50 percent.
Max temperature.....Around 38.
Min humidity........81 percent.
Wind (20 ft)........Southwest winds 9 to 14 mph. Gusts up to 24 mph
                    in the morning then 21 mph early in the
                    afternoon.
Mixing height.......Below 1000 FT AGL until 0800, then 1800 ft AGL.
Transport winds.....West 13 to 20 mph.
Smoke dispersal.....Poor.

TIME (MST)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........80  79  79  80  82  83  82  80  79  75  72  68
Weather cov.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC SCH
Weather type....SN  SN  SN  SN  SN  SN  SN  SN  RS  RS  RS  RS
Tstm cov........
Chc of pcpn (%).50  50  50  50  50  40  40  40  40  40  40  20
Temp............32  32  33  34  35  37  37  38  38  38  37  37
RH..............86  86  87  86  88  87  88  87  86  87  85  83
20 FT wind dir..SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  W   W
20 FT wind spd..9   9   9   9   10  12  13  13  13  13  12  12
20 FT wind gust.22  22  23  24  24  18  21  21  21  21  18  18
Mix hgt (kft)...0.8 0.9 1.0 1.3 1.5 1.8 1.8 1.8 1.8 1.6 1.3 1.1
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.14  13  13  15  17  20  18  18  17  16  15  14
Vrate kt-ft/1K..9   10  11  16  23  30  29  29  28  22  18  13
SmokeDispersion.P   P   P   P   P   P   P   P   P   P   P   P

$$
Forecaster...Pettett
Requested by...Ryan Nadiak
Type of request...PRESCRIBED
.TAG 2527233.0/BOU
.DELDT 12/08/25
.FormatterVersion 2.0.0
.EMAIL ryan.nadiak@usda.gov