548
FNUS73 KUNR 062303
FWSUNR

Spot Forecast for Trust...Great Plains Dispatch
National Weather Service Rapid City SD
503 PM MDT Sun Sep 6 2026

Forecast is based on forecast start time of 1700 MDT on September 06.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...Chances for thunderstorms increase through this evening
and the overnight hours. As of now, it looks like the greatest
risk for storms will occur after 2100, though can`t rule out an
isolated storm or two impacting the fire site earlier in the
evening. Lightning and gusty, erratic outflow winds will be the
main concern. Humidities overnight will recover to around 78%.
Winds early this evening will be out of the southeast at 10 mph,
gusting up to 20 mph before becoming light and primarily terrain
driven after 2100.

Near critical conditions Monday with RH around 17 to 20 percent
and high temperature around 87 degrees. West winds will continue
through the day with sustained winds of 15 to 20 mph, gusting up
to 30 mph. Strongest winds expected in exposed areas, with
slightly lighter winds in heavier sheltering.

.TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent) then becoming
                    mostly cloudy (60-70 percent). Chance of showers
and thunderstorms in the late evening and overnight.
Min temperature.....Around 65.
Max humidity........78 percent.
Wind (20 ft)........Southeast winds around 10 mph, gusting up to 21 mph
before becoming light and primarily terrain driven after 9 pm. Gusty
                    and erratic winds expected near thunderstorms.
CWR.................20 percent.
Mixing height.......500 to 1000 ft agl.
Transport winds.....South 15 to 20 mph shifting to the southwest
                    around 10 mph overnight, then shifting to the
                    west early in the morning.
Smoke dispersal.....Poor.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........7   16  27  23  32  41  49  49  47  59  68  59
Weather cov.....SCH SCH SCH CHC CHC CHC CHC CHC CHC SCH SCH SCH
Weather type....RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........SCH SCH SCH CHC CHC CHC CHC CHC CHC SCH SCH SCH
CWR.............20  20  20  20  20  20  20  20  20  20  20  20
Temp............81  78  76  76  75  74  72  71  70  69  67  66
RH..............42  47  51  53  54  55  61  66  68  70  75  75
20 FT wind dir..SE  SE  SE  SE  SE  SE  SE  S   SW  NW  NW  SW
20 FT wind spd..9   9   8   7   6   6   6   6   3   5   5   5
20 FT wind gust.21  18  18  16  16  15  14  14  13  12  12  13
Mix hgt (kft)...3.6 0.8 0.5 0.5 0.5 0.5 0.5 0.5 0.6 0.5 0.5 0.5
Transp wind dir.S   S   SE  SE  SE  S   S   S   S   SW  SW  W
Transp wind spd.20  17  16  14  13  13  12  10  10  9   10  12

.LABOR DAY...

Sky/weather.........Mostly cloudy (75-85 percent) then becoming
                    mostly sunny (30-40 percent). Slight chance of
                    showers and thunderstorms in the morning.
Max temperature.....Around 87.
Min humidity........17 percent.
Wind (20 ft)........West winds 10 to 15 mph with gusts to around 24
                    mph increasing to 20 to 25 mph with gusts to
                    around 31 mph in the late morning and
                    afternoon. Gusty and erratic winds expected
                    near thunderstorms in the morning.
CWR.................0 percent.
Mixing height.......8000 to 8500 ft agl.
Transport winds.....West 15 to 25 mph increasing to around 40 mph.
Smoke dispersal.....Good increasing to excellent.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........80  82  79  73  34  47  31  27  20  22  33  33
Weather cov.....SCH SCH SCH SCH SCH SCH
Weather type....RW  RW  RW  RW  RW  RW
Tstm cov........SCH SCH SCH SCH SCH SCH
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Temp............67  66  69  71  76  78  80  82  85  85  86  87
RH..............75  78  66  59  46  40  34  28  24  21  19  17
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..7   9   13  15  18  20  21  21  21  20  18  17
20 FT wind gust.14  16  20  24  28  30  31  30  30  30  31  30
Mix hgt (kft)...0.5 0.7 1.1 1.7 2.9 3.3 4.9 6.1 7.3 8.5 7.7 6.9
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.14  18  23  29  32  35  37  38  39  39  38  37

$$
Forecaster...EW
Requested by...Michael Smits
Type of request...WILDFIRE
.TAG 2621343.0/UNR
.DELDT 09/06/26
.FormatterVersion 2.0.0
.EMAIL john.haskvits@state.sd.us,seth.stevens@state.sd.us,riley.stevens@state.sd.us,quentin.cordell@state.sd.us,sdgpc@firenet.gov