954
FNUS73 KUNR 021240
FWSUNR

Spot Forecast for Gertie Fire...USFS
National Weather Service Rapid City SD
640 AM MDT Thu Oct 2 2025

Forecast is based on forecast start time of 0700 MDT on October 02.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...Sunny today with south winds 5 to 10 mph with a few
gusts to around 15 mph this afternoon. RH`s will drop to the mid
20s today. Fair recovery tonight with south winds continuing at 5
to 10 with gusts up to 20 mph. Friday will see potential critical
fire weather conditions with gusty southwest winds of 15 to 25
mph. RH`s will fall into the teens Friday. A strong cold front
will move through the region Saturday, bringing a good chance for
rain and much cooler weather and higher humidities.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
Max temperature.....Around 73.
Min humidity........26 percent.
Wind (20 ft)........South winds around 5 mph shifting to the
                    southwest early in the morning. Gusts up to 18
                    mph.
CWR.................0 percent.
Mixing height.......7900 to 8400 ft agl.
Transport winds.....Southwest 10 to 20 mph.
Smoke dispersal.....Good increasing to very good in the afternoon.

TIME (MDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........3   2   1   1   1   1   1   2   2   3   4
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0
Temp............51  51  56  62  67  70  72  73  73  72  70
RH..............62  63  56  42  34  30  27  26  26  27  29
20 FT wind dir..S   SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..3   5   5   5   5   6   6   6   6   6   5
20 FT wind gust.13  13  14  14  15  17  18  18  18  16  14
Mix hgt (kft)...0.6 0.6 0.8 3.1 6.1 7.3 7.6 7.8 8.4 6.6 5.3
Transp wind dir.SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  S
Transp wind spd.12  13  13  14  15  15  16  15  15  12  9

.TONIGHT...

Sky/weather.........Mostly clear (20-30 percent).
Min temperature.....Around 52.
Max humidity........53 percent.
Wind (20 ft)........South winds around 5 mph with gusts to around
                    12 mph shifting to the southwest with gusts to
                    around 18 mph in the late evening and
                    overnight.
CWR.................0 percent.
Mixing height.......500 to 1000 ft agl.
Transport winds.....South 10 to 20 mph.
Smoke dispersal.....Poor.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........5   11  16  22  23  24  25  31  38  45  39  33
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Temp............67  63  60  58  58  58  57  57  57  57  56  55
RH..............33  38  42  45  44  44  43  45  47  49  51  53
20 FT wind dir..SW  S   S   S   S   S   S   S   S   SW  SW  SW
20 FT wind spd..2   2   2   3   5   5   6   6   6   7   7   7
20 FT wind gust.9   9   10  12  14  14  9   17  18  18  18  18
Mix hgt (kft)...1.1 0.5 0.5 0.5 0.5 0.5 0.6 0.6 0.6 0.6 0.6 0.6
Transp wind dir.SE  S   S   S   S   S   S   S   S   S   S   SW
Transp wind spd.7   7   8   9   10  13  14  15  16  16  16  16

.FRIDAY...

Sky/weather.........Sunny (15-25 percent).
Max temperature.....Around 77.
Min humidity........20 percent.
Wind (20 ft)........Southwest winds around 10 mph with gusts to
                    around 24 mph.
CWR.................0 percent.
Mixing height.......7700 to 8200 ft agl.
Transport winds.....Southwest 20 to 25 mph increasing to 25 to 35
                    mph late in the morning, then decreasing to
                    around 20 mph late in the afternoon.
Smoke dispersal.....Very good increasing to excellent in the
                    afternoon, then decreasing to fair late in the
                    afternoon.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........27  23  19  16  15  14  13  14  14  15  19  23
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Temp............56  58  62  66  69  72  75  76  77  77  75  73
RH..............51  47  43  40  32  26  22  21  20  21  22  24
20 FT wind dir..SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..6   6   6   6   7   8   9   9   9   8   7   6
20 FT wind gust.17  17  17  18  20  22  23  24  24  23  21  18
Mix hgt (kft)...0.6 0.7 0.8 1.0 2.7 4.4 6.1 6.8 7.5 8.2 5.7 3.2
Transp wind dir.SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
Transp wind spd.16  17  17  20  23  28  30  32  32  30  25  18

$$
Forecaster...JC
Requested by...M. Morgan
Type of request...WILDFIRE
.TAG 2522887.0/UNR
.DELDT 10/02/25
.FormatterVersion 2.0.0
.EMAIL michael.morgan3@usda.gov