020
FNUS73 KUNR 170036
FWSUNR

Spot Forecast for Idol...SDS Wildland Fire
National Weather Service Rapid City SD
636 PM MDT Wed Sep 16 2026

Forecast is based on forecast start time of 1900 MDT on September 16.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...Northerly winds will diminish over the next several
hours and become downslope/downvalley for much of the night. The
overnight RH will recover to around 75 percent by Thursday
morning. Cloudy conditions are expected Thursday with wetting
rain chances 50/50 by Thursday afternoon. Winds will remain
generally light through the day. Cool and wet conditions continue
into Thursday night, before drying out on Friday. Cool and wet
conditions are expected again over the weekend.


.REST OF TONIGHT...

Sky/weather.........Partly cloudy (20-30 percent) then becoming
                    mostly cloudy (60-70 percent).
Min temperature.....Around 52.
Max humidity........75 percent.
Wind (20 ft)........North winds 8 to 14 mph with gusts to around
                    20 mph becoming light downslope/downvalley by
                    late this evening.
CWR.................0 percent.
Mixing height.......500 to 1000 ft agl.
Transport winds.....Northeast 10 to 15 mph shifting to the east
                    overnight.
Smoke dispersal.....Poor.

TIME (MDT)      7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........21  15  18  19  31  36  51  61  67  74  78
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0
Temp............70  66  63  61  58  55  55  54  54  53  52
RH..............35  42  45  50  55  61  64  66  69  71  73
20 FT wind dir..N   NE  NE  NE  E   E   E   E   E   E   E
20 FT wind spd..5   3   2   2   2   2   1   1   1   1   1
20 FT wind gust.14  12  10  9   8   8   7   7   7   7   7
Mix hgt (kft)...0.8 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.N   NE  NE  NE  NE  E   E   E   E   E   SE
Transp wind spd.14  12  9   8   8   7   7   7   7   7   7

.THURSDAY...

Sky/weather.........Mostly cloudy (80-90 percent). Isolated
                    rain showers and thunderstorms by late morning.
                    Rain showers likely in the afternoon.
Max temperature.....Around 72.
Min humidity........55 percent.
Wind (20 ft)........Light winds becoming upslope/upvalley by mid
                    morning, then mainly out of the east to
                    southeast at 4 to 8 mph. Gusty and erratic winds
                    expected near thunderstorms.
CWR.................50 percent.
Mixing height.......1800 to 2300 ft agl.
Transport winds.....Southeast 10 to 15 mph.
Smoke dispersal.....Poor.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........80  87  76  73  71  74  89  89  90  92  93  97
Weather cov.....            SCH SCH SCH CHC CHC CHC LKY LKY LKY
Weather type....            RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........            SCH SCH SCH SCH SCH SCH SCH SCH SCH
CWR.............10  10  10  10  20  30  40  50  50  50  50  50
Temp............54  54  57  61  64  66  69  69  69  70  68  67
RH..............71  69  67  62  58  56  55  59  59  59  63  68
20 FT wind dir..E   E   E   E   E   E   SW  W   NE  E   SE  SE
20 FT wind spd..1   2   2   2   3   2   2   2   2   3   3   3
20 FT wind gust.7   7   9   10  10  13  14  14  14  15  14  13
Mix hgt (kft)...0.5 0.5 0.5 0.9 1.2 1.8 2.3 1.6 1.7 1.8 1.5 1.2
Transp wind dir.SE  SE  SE  SE  SE  SE  SE  SE  SE  SE  SE  SE
Transp wind spd.7   7   8   9   10  10  12  12  12  12  12  12

.THURSDAY NIGHT...

Sky/weather.........Mostly cloudy (75-85 percent). Rain showers
                    likely in the evening, then chance of rain
                    showers overnight.
Min temperature.....Around 55.
Max humidity........90 percent.
Wind (20 ft)........Southeast winds around 5 mph with gusts to
                    around 10 mph shifting to the south early in
                    the morning.
CWR.................50 percent.
Mixing height.......500 to 1000 ft agl.
Transport winds.....Southeast 10 to 15 mph shifting to the
                    southwest overnight.
Smoke dispersal.....Poor.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........96  92  85  82  82  77  67  63  63  62  63  63
Weather cov.....LKY LKY LKY LKY LKY LKY CHC CHC CHC CHC CHC CHC
Weather type....RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........SCH SCH SCH
CWR.............50  50  50  50  50  50  50  50  50  50  50  50
Temp............65  62  60  60  59  59  58  58  59  57  57  57
RH..............73  78  87  87  90  87  87  87  80  83  80  80
20 FT wind dir..SE  E   E   SE  SE  SE  SE  SE  SE  S   S   S
20 FT wind spd..3   3   3   3   2   2   2   1   1   1   1   1
20 FT wind gust.14  12  13  13  12  9   10  9   8   7   7   8
Mix hgt (kft)...1.0 0.8 0.7 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.E   E   SE  SE  SE  SE  SE  SE  S   SW  SW  SW
Transp wind spd.13  13  14  14  14  13  10  8   7   6   6   8

$$
Forecaster...SR
Requested by...Laura Stee
Type of request...WILDFIRE
.TAG 2622037.0/UNR
.DELDT 09/16/26
.FormatterVersion 2.0.0
.EMAIL sdgpc@firenet.gov