508
FNUS75 KBYZ 252008
FWSBYZ

Spot Forecast for Prospect Cedar...USFS
National Weather Service Billings MT
208 PM MDT Fri Sep 25 2026

Forecast is based on ignition time of 1700 MDT on September 25.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...Breezy conditions to persist through late this
afternoon, then expect a gradual decrease in winds as surface
heating subsides, higher exposed areas at the burn site may
continue to experience gusty winds tonight along with a wind shift
to the northwest with the passage of the front. Otherwise, expect
a dry cold front to move across the burn area tonight with the
only noticeable impact being a slight uptick (between 9pm and
midnight) in wind speeds out of the southwest before subsiding
again after midnight. Winds will be on the increase Saturday
morning with the onset of daytime heating. Expect breezy southwest
winds on Saturday with gusts up to 35 mph possible.

.REST OF TODAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....54-58.
Min humidity........32-39 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds 10 to 15 mph with gusts to
                    around 28 mph.
 Ridgetop...........South around 18 mph.
Mixing height.......3900 ft AGL.
Transport winds.....Southwest around 20 mph.
Smoke dispersal.....Good (66600 knot-ft).

TIME (MDT)      5PM
Sky (%).........42
Weather cov.....
Weather type....
Tstm cov........
Chc of ltng (%).0
Temp............54
RH..............37
20 FT wind dir..SW
20 FT wind spd..14
20 FT wind gust.28
SDsp kt-ft/1000.67

.TONIGHT...

Sky/weather.........Mostly clear.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....40-44.
Max humidity........54-58 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds 5 to 15 mph. Gusts up to 29
                    mph.
 Ridgetop...........West around 20 mph.
Mixing height.......2700 ft AGL early in the evening decreasing to
                    500 ft AGL overnight.
Transport winds.....Southwest 13 to 17 mph shifting to the west 13
                    to 20 mph.
Smoke dispersal.....Poor (38100 knot-ft early in the evening
                    decreasing to 5000 knot-ft late in the night).

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........38  40  27  12  6   7   4   9   18  20  21  15
Weather cov.....
Weather type....
Tstm cov........
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............53  48  47  47  47  47  47  46  46  46  44  43
RH..............44  50  52  50  50  48  49  49  49  49  51  53
20 FT wind dir..SW  SW  SW  SW  SW  SW  SW  SW  SW  W   SW  SW
20 FT wind spd..11  10  13  15  15  14  14  13  13  11  10  9
20 FT wind gust.20  19  22  23  23  22  22  19  19  18  16  14
SDsp kt-ft/1000.38  11  8   9   9   9   9   8   8   7   6   6

.SATURDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....53-57.
Min humidity........34-38 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds 10 to 20 mph with gusts to
                    around 35 mph.
 Ridgetop...........Southwest around 25 mph.
Mixing height.......600 ft AGL early in the morning increasing to
                    6100 ft AGL in the afternoon.
Transport winds.....Southwest 12 to 17 mph increasing to 25 to 35
                    mph in the late morning and afternoon.
Smoke dispersal.....Poor (5600 knot-ft) early in the morning
                    increasing to excellent (165600 knot-ft) in the
                    afternoon.

TIME (MDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........17        17        6         11
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
Chc of ltng (%).0         0         0         0
Temp............42        46        51        53
RH..............56        50        43        36
20 FT wind......SW 9G14   SW 13G21  SW 18G35  SW 19G35
SDsp kt-ft/1000.6         31        123       166

$$
Forecaster...Wetenkamp
Requested by...Jon Warder
Type of request...PRESCRIBED
.TAG 2622420.1/BYZ
.DELDT 09/25/26
.FormatterVersion 2.0.0
.EMAIL jonathan.warder@usda.gov,jonathan.stonelake@usda.gov