255
FNUS73 KUNR 191531
FWSUNR

Spot Forecast for Route Four Nine...SD-PRA
National Weather Service Rapid City SD
931 AM MDT Tue Aug 19 2025

Forecast is based on forecast start time of 1000 MDT on August 19.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...

Hot and dry conditions are expected today and tomorrow, with highs
in the mid to upper 90s and minimum relative humidity values
likely falling below 20 percent. Light and variable winds early
today will become predominantly easterly by early afternoon, then
shift to the south this evening. Winds will gradually increase over
the next 24 hours, with sustained winds of 10 to 15 mph and gusts
to 25 mph expected tomorrow afternoon.

.REST OF TODAY...

Sky/weather.........Sunny (5-15 percent).
Max temperature.....Around 95.
Min humidity........15 to 20 percent.
Wind (20 ft)........Light and variable winds this morning becoming
                    predominantly east around 10 mph by early
                    afternoon. Gusts to around 15 mph in exposed
                    areas this afternoon.
CWR.................0 percent.
Mixing height.......10600 to 11100 ft agl increasing to 11300 to
                    11800 ft agl late in the afternoon.
Transport winds.....Northwest to north around 10 mph this morning
                    becoming east at 10 to 15 mph by early
                    afternoon.
Smoke dispersal.....Good increasing to excellent late in the
                    afternoon.

TIME (MDT)      10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........2   3   3   5   8   10  12  14
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0
Temp............83  85  91  93  93  95  95  94
RH..............36  32  27  23  22  19  19  21
20 FT wind dir..S   E   E   E   E   E   E   E
20 FT wind spd..5   5   6   7   8   9   10  10
20 FT wind gust.9   9   10  13  14  15  16  17
Mix hgt (kft)...1.7 3.1 6.5 9.6 11  12  12  10
Transp wind dir.NW  N   NE  NE  E   E   E   E
Transp wind spd.8   9   10  12  14  15  16  17

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent).
Min temperature.....Around 65.
Max humidity........85 to 90 percent.
Wind (20 ft)........East winds around 10 mph shifting to the south
                    overnight. Gusts up to 20 mph.
CWR.................0 percent.
Mixing height.......400 to 900 ft agl.
Transport winds.....East at 15 to 20 mph shifting to the south late
                    in the evening.
Smoke dispersal.....Poor.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........16  21  26  17  10  8   6   7   7   7   8   11
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Temp............91  87  82  78  76  74  72  71  70  67  66  66
RH..............25  30  40  47  52  57  64  68  68  78  84  81
20 FT wind dir..E   E   E   E   SE  SE  SE  S   S   S   S   S
20 FT wind spd..10  10  10  10  10  10  10  10  10  10  10  9
20 FT wind gust.17  17  18  18  18  18  18  17  17  16  16  16
Mix hgt (kft)...6.2 0.9 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.4 0.4
Transp wind dir.E   E   E   E   E   SE  SE  S   S   S   S   S
Transp wind spd.18  18  18  18  18  18  17  17  16  16  15  15

.WEDNESDAY...

Sky/weather.........Sunny (0-10 percent).
Max temperature.....Around 97.
Min humidity........Around 20 percent.
Wind (20 ft)........South winds 10 to 15 mph with gusts to around
                    25 mph.
CWR.................0 percent.
Mixing height.......8900 to 9400 ft agl increasing to 10400 to
                    10900 ft agl late in the afternoon.
Transport winds.....South 15 to 25 mph.
Smoke dispersal.....Good increasing to excellent in the afternoon.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........14  11  3   1   0   1   1   3   4   6   7   8
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Temp............64  67  71  79  84  89  92  94  96  96  96  95
RH..............87  81  71  56  44  35  30  26  23  21  20  21
20 FT wind dir..S   S   S   S   S   S   S   S   S   S   S   SE
20 FT wind spd..9   10  12  12  13  13  14  14  14  14  14  14
20 FT wind gust.16  16  17  18  20  20  21  22  22  23  23  23
Mix hgt (kft)...0.4 0.6 0.8 1.1 2.8 4.5 6.3 7.8 9.4 11  9.8 8.7
Transp wind dir.S   S   S   S   S   S   S   S   SE  SE  SE  SE
Transp wind spd.15  16  17  18  18  20  21  22  22  22  22  22

$$
Forecaster...KS
Requested by...Justin Bauer
Type of request...WILDFIRE
.TAG 2519978.3/UNR
.DELDT 08/19/25
.FormatterVersion 2.0.0
.EMAIL justin.bauer@bia.gov