970
FNUS73 KUNR 201154
FWSUNR

Spot Forecast for West Coal Creek Fire...Campbell County Fire Department
National Weather Service Rapid City SD
554 AM MDT Thu Aug 20 2026

Forecast is based on forecast start time of 0600 MDT on August 20.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...Light and variable winds today will turn northwesterly
after 1000-1100 this morning. While sustained winds will be light
(less than 10 mph) with gusts to 15 mph, there is potential for an
occasional gust to 25 mph during the afternoon (1400-1800) given
high mixing heights during peak heating. Daytime minimum relative
humidity will fall to around 12 percent with temperatures pushing
into the low to mid 90s. Expect elevated fire weather conditions
this afternoon given high temperatures and low RH.

Overnight RH recovery will be poor (~50%) Thursday night into
Friday morning, although winds will be light and variable.

Elevated fire weather conditions persist Friday with temperatures
in the 90s, RH in the teens, and north winds with gusts 20 to 25
mph during the afternoon.

.TODAY...

Sky/weather.........Sunny (10-20 percent).
Max temperature.....Around 93.
Min humidity........12-15 percent.
Wind (20 ft)........Light and variable winds becoming northwest
                    after 1000-1100. Sustained winds 5 to 10 mph
                    with gusts to 15 mph. An occasional gust to
                    25 mph is possible between 1400 and 1800.
CWR.................0 percent.
Mixing height.......9100 to 9600 ft agl increasing to 10200 to
                    10700 ft agl late in the afternoon.
Transport winds.....Southwest around 10 mph shifting to the
                    northwest late in the morning.
Smoke dispersal.....Good increasing to very good late in the
                    afternoon.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........11  23  10  6   4   4   6   7   6   6   6   3
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Temp............55  58  64  71  77  82  87  89  91  93  93  93
RH..............46  49  41  33  27  22  19  17  14  13  13  13
20 FT wind dir..S   SW  SW  W   W   NW  NW  NW  NW  NW  NW  N
20 FT wind spd..5   2   2   2   2   3   3   3   3   3   5   5
20 FT wind gust.7   6   7   8   8   8   10  12  14  14  15  14
Mix hgt (kft)...0.5 0.4 0.4 0.7 2.4 5.4 7.5 8.7 9.6 11  10  10
Transp wind dir.S   SW  SW  SW  W   W   W   W   W   W   NW  NW
Transp wind spd.7   8   8   8   8   8   8   9   12  13  13  12

.TONIGHT...

Sky/weather.........Partly cloudy (45-55 percent).
Min temperature.....Around 63.
Max humidity........50 percent.
Wind (20 ft)........North-northwest winds becoming light and
                    variable overnight; sustained winds around
                    5 mph.
CWR.................0 percent.
Mixing height.......400 to 900 ft agl.
Transport winds.....Northwest around 15 mph shifting to the east
                    early in the evening, then shifting to the
                    southeast late in the evening shifting to the
                    south after 3 am.
Smoke dispersal.....Poor.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........5   11  26  43  49  58  50  55  60  60  63  58
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Temp............92  89  84  79  75  73  71  69  67  66  64  63
RH..............14  17  20  25  28  31  35  39  42  43  46  50
20 FT wind dir..N   N   NE  E   E   E   SE  SE  S   S   S   S
20 FT wind spd..5   3   3   3   3   5   3   3   3   3   5   5
20 FT wind gust.14  12  10  12  13  10  10  9   10  10  10  9
Mix hgt (kft)...8.9 3.4 0.4 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.4 0.4
Transp wind dir.NW  N   NE  E   E   SE  SE  SE  S   S   S   S
Transp wind spd.12  12  12  13  13  14  14  15  15  15  15  13

$$
Forecaster...SE
Requested by...Travis Wickwire
Type of request...WILDFIRE
.TAG 2620074.0/UNR
.DELDT 08/20/26
.FormatterVersion 2.0.0
.EMAIL bryanb@campbellcofirewy.us,travisw@campbellcofirewy.gov