195
FNUS75 KBOU 152225
FWSBOU

Spot Forecast for CO WRF Piles Blue River West...USFS
National Weather Service Denver/Boulder CO
325 PM MST Mon Dec 15 2025

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

.DISCUSSION... Tuesday will be mild and dry with relative humidity
dropping to around 35-40%. With west winds gusting up to 25 mph
and moderately high mixing heights, fair smoke dispersal will
develop from the late morning through the late afternoon.

A strong low pressure system will approach Colorado on Wednesday
and will move through the area on Wednesday night. This system
will bring strong winds that could gust up to 40 mph Wednesday
afternoon and gusts could reach over 60 mph Wednesday night. Smoke
dispersal will be very good on Wednesday as the storm approaches.
This system will also bring snow beginning Wednesday afternoon
lasting through Thursday morning. 2-4" of snow is expected.

.TUESDAY...

Sky/weather.........Partly cloudy (25-35 percent).
CWR.................1 percent.
Chance of pcpn......0 percent.
Max temperature.....Around 43.
Min humidity........38 percent.
Wind (20 ft)........Northwest winds 9 to 14 mph. Gusts up to 21 mph
                    early in the afternoon then 20 mph late in the
                    afternoon.
Mixing height.......2500 ft AGL.
Transport winds.....Northwest 14 to 23 mph until 1700, then around
                    12 mph.
Smoke dispersal.....Poor until 1100, then fair until 1500, then
                    poor.

TIME (MST)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........32  24  21  28  16  11  16  22  24  24  22  9
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............24  24  26  33  38  42  42  43  42  40  37  31
RH..............44  48  51  48  45  45  46  47  48  53  56  68
20 FT wind dir..NW  NW  NW  NW  NW  NW  NW  NW  NW  NW  NW  NW
20 FT wind spd..10  10  10  10  10  12  12  13  13  12  10  9
20 FT wind gust.16  16  16  16  16  18  18  21  21  18  16  20
Mix hgt (kft)...1.5 1.5 1.3 1.6 2.0 2.4 2.6 2.8 2.7 2.2 1.5 1.4
Transp wind dir.W   NW  NW  NW  NW  NW  NW  NW  NW  NW  NW  NW
Transp wind spd.16  15  16  18  18  20  21  23  21  20  14  12
Vrate kt-ft/1K..21  19  19  26  32  40  46  56  48  38  18  14
SmokeDispersion.P   P   P   P   P   F   F   F   F   P   P   P

.TUESDAY NIGHT...

Sky/weather.........Mostly clear (10-20 percent).
CWR.................1 percent.
Chance of pcpn......0 percent.
Min temperature.....Around 18.
Max humidity........89 percent.
Wind (20 ft)........Northwest winds 5 to 13 mph until 2000. West 6
                    to 11 mph with gusts to around 22 mph after
                    2300.
Mixing height.......1300 ft AGL.
Transport winds.....Northwest 9 to 14 mph until 2100. West 19 to 24
                    mph after 0300.
Smoke dispersal.....Poor.

TIME (MST)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........9   13  17  8   16  23  22  20  19  18  16  15
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............29  27  25  25  24  24  24  23  22  21  20  20
RH..............68  71  74  71  71  71  72  75  77  81  84  88
20 FT wind dir..NW  NW  W   W   W   W   W   W   W   W   W   W
20 FT wind spd..8   7   7   7   7   7   7   8   8   9   9   10
20 FT wind gust.17  17  17  17  17  17  17  17  18  20  22  16
Mix hgt (kft)...1.3 1.5 1.4 1.5 1.4 1.4 1.5 1.5 1.5 1.5 1.5 1.5
Transp wind dir.NW  W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.13  13  10  10  13  14  15  17  18  20  21  22
Vrate kt-ft/1K..15  16  13  13  15  17  19  22  24  25  27  29
SmokeDispersion.P   P   P   P   P   P   P   P   P   P   P   P

.WEDNESDAY...

Sky/weather.........Mostly sunny (15-25 percent) until 0900, then
                    partly cloudy (30-40 percent) until 1100, then
                    mostly cloudy (60-70 percent). Chance of snow
                    after 1100 until 1700, then snow likely.
CWR.................7 percent increasing to 42 percent late in the
                    afternoon.
Chance of pcpn......70 percent.
Max temperature.....Around 44.
Min humidity........51 percent.
Wind (20 ft)........West winds 12 to 21 mph with gusts to around 33
                    mph until 1600, then 19 to 27 mph with gusts to
                    around 35 mph.
Mixing height.......3600 ft AGL.
Transport winds.....West 22 to 31 mph until 1100, then 33 to 38
                    mph.
Smoke dispersal.....Poor until 0900, then fair until 1000, then
                    good until 1100, then very good.

TIME (MST)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........17  18  20  31  42  53  53  53  53  61  70  78
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  40
Chc of pcpn (%).0   0   0   0   0   30  30  30  30  30  30  70
Temp............21  23  26  32  38  43  44  43  41  39  37  35
RH..............89  85  73  63  56  51  51  53  56  61  64  70
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..12  12  13  14  16  17  18  18  20  21  22  23
20 FT wind gust.18  18  21  22  25  28  30  30  31  33  35  35
Mix hgt (kft)...1.6 1.6 1.7 2.2 2.8 3.4 3.5 3.6 3.7 3.6 3.5 3.3
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.22  22  22  26  31  36  36  36  36  36  35  35
Vrate kt-ft/1K..30  31  32  52  76  104 107 110 114 109 105 101
SmokeDispersion.P   P   P   F   G   VG  VG  VG  VG  VG  VG  VG

$$
Forecaster...Danielson
Requested by...Kris Hills
Type of request...PRESCRIBED
.TAG 2527714.0/BOU
.DELDT 12/15/25
.FormatterVersion 2.0.0
.EMAIL Kris.hills@usda.gov