355
FNUS75 KBYZ 152148
FWSBYZ

Spot Forecast for Long Park Piles...USDA-USFS
National Weather Service Billings MT
248 PM MST Mon Dec 15 2025

Forecast is based on ignition time of 0600 MST on December 16.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office if you have questions or concerns with
this forecast.

.DISCUSSION...
Gusty west winds are expected to persist at the burn site Tuesday
and Wednesday. On Tuesday, strongest gusts will be in the morning.
After some decrease in the afternoon/evening, southwest to west
winds will intensify overnight through Wednesday morning (gusting
40-50 mph). A cold front arrives Wednesday afternoon, bringing a
shift to decreased northwest winds, colder temps and snow showers.

.TUESDAY...

Sky/weather.........Partly sunny. A few afternoon flurries
                    possible.
CWR.................0 percent.
Max temperature.....38-42.
Min humidity........45-49 percent.
Wind (20 ft)........
 Slope/valley.......West 15-25 mph. Gusts to 35 mph in the morning.
 Ridgetop...........West to northwest 25-35 mph. Gusts to 45 mph in
                    the morning.
Mixing height.......Increasing to 2500 ft AGL in the afternoon.
Transport winds.....West 30 mph decreasing to 20 mph.
Smoke dispersal.....Increasing to good (75000 knot-ft) in the
                    afternoon.

TIME (MST)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........12  22  32  37  45  55  56  47  48  53  60  57
Weather cov.....
Weather type....
Tstm cov........
Temp............34  35  34  35  37  39  39  40  40  38  37  36
RH..............53  55  57  54  52  50  49  48  47  51  55  57
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..25  25  24  22  19  17  16  15  15  15  15  16
20 FT wind gust.35  35  34  32  31  28  27  25  24  23  22  22
SDsp kt-ft/1000.13  15  26  42  51  62  72  75  63  52  35  27

.TUESDAY NIGHT...

Sky/weather.........Mostly cloudy with a few evening flurries, then
                    turning partly cloudy.
CWR.................0 percent.
Min temperature.....28-32.
Max humidity........58-62 percent.
Wind (20 ft)........
 Slope/valley.......Southwest to west 10-20 mph increasing
                    to 20-30 mph with gusts to 40 mph overnight.
 Ridgetop...........West 20-30 mph increasing to 35-50 mph.
Mixing height.......Decreasing to 700 ft AGL overnight.
Transport winds.....West 20 mph increasing to 30 mph.
Smoke dispersal.....Poor (decreasing to 14000 knot-ft).

TIME (MST)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........58  59  60  61  57  53  53  53  44  44  44  50
Weather cov.....
Weather type....
Tstm cov........
Temp............33  33  33  32  31  30  32  33  33  34  34  35
RH..............62  61  60  59  59  58  56  54  51  49  49  48
20 FT wind dir..W   W   W   W   SW  SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..17  17  18  19  19  19  19  19  24  25  26  28
20 FT wind gust.23  25  26  28  28  29  30  32  34  36  38  40
SDsp kt-ft/1000.23  15  16  16  14  14  14  15  16  17  18  19

.WEDNESDAY...

Sky/weather.........Mostly cloudy. Slight chance of snow showers
                    in the morning, then snow showers likely in
                    the afternoon. Snow accumulation up to an inch.
CWR.................30 percent.
Max temperature.....39-43 in the morning, then falling to around 30.
Min humidity........44-48 percent.
Wind (20 ft)........
 Slope/valley.......Southwest 30-40 mph gusting to 45 mph in the
                    morning, shifting to northwest 15-25 mph in
                    the afternoon.
 Ridgetop...........Southwest 45-55 mph becoming west 30-40 mph
                    in the afternoon.
Mixing height.......Increasing to 3500 ft AGL in the afternoon.
Transport winds.....West 40 mph becoming northwest 20 mph.
Smoke dispersal.....Increasing to very good (140000 knot-ft).

TIME (MST)      6 AM      9 AM      NOON      3 PM
Sky (%).........50        45        86        89
Weather cov.....S CHC     S CHC     LIKELY    LIKELY
Weather type....SNSHWR    SNSHWR    SNSHWR    SNSHWR
Tstm cov........
Temp............37        41        40        32
RH..............47        46        56        59
20 FT wind......SW 30G43  SW 32G45  W 25G40   NW 20G30
SDsp kt-ft/1000.28        100       140       135

$$
Forecaster...Lester
Requested by...Trae Holliday
Type of request...PRESCRIBED
.TAG 2527739.0/BYZ
.DELDT 12/15/25
.FormatterVersion 2.0.0
.EMAIL trae.holliday@usda.gov