026
FNUS73 KUNR 201020
FWSUNR
SPOT FORECAST FOR ANTIHORSE ALPHA...USFS
NATIONAL WEATHER SERVICE RAPID CITY SD
420 AM MDT TUE OCT 20 2026
FORECAST IS BASED ON IGNITION TIME OF 0000 MDT ON OCTOBER 22.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
WARM AND DRY WEATHER WILL CONTINUE THROUGH THURSDAY.
EARLY MORNING SOUTHWESTERLY WINDS WILL RESULT IN MAX TEMPERATURES
APPROXIMATELY 5 DEGREES WARMER THAN WEDNESDAY. MINIMUM RH IS
EXPECTED TO BE IN THE 45-50% RANGE. WARM SOUTH TO SOUTHEASTERLY
WINDS WILL CONTINUE THROUGH FRIDAY, WITH SIMILAR TO SLIGHTLY
COOLER TEMPERATURES/SLIGHTLY LOWER RH. HOWEVER, AT THIS TIME
WINDS DO APPEAR TO BE STRONGER ON FRIDAY, WITH GUSTS TO AROUND 35
MPH POSSIBLE. A COLD FRONT IS EXPECTED TO CROSS THE AREA SOMETIME
LATE FRIDAY OR EARLY SATURDAY, WHICH WILL BRING BREEZY NORTHWEST
WINDS ON SATURDAY AND ABOUT A 10 TO 15 DEGREE DROP IN DAYTIME MAX
TEMPERATURES.
THURSDAY
SKY/WEATHER.........PARTLY CLOUDY (20-30 PERCENT).
MIN TEMPERATURE.....AROUND 45.
MAX HUMIDITY........86 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 10 TO 15 MPH WITH GUSTS TO
AROUND 25 MPH.
CWR.................0 PERCENT.
MIXING HEIGHT.......500 TO 1000 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 15 TO 20 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........29 27 24 22 25 29
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0
TEMP............51 51 50 49 48 47
RH..............68 68 71 74 77 79
20 FT WIND DIR..SE SE SE SE SE SE
20 FT WIND SPD..12 12 12 10 8 7
20 FT WIND GUST.25 22 21 20 17 14
MIX HGT (KFT)...0.6 0.6 0.5 0.5 0.5 0.5
TRANSP WIND DIR.SE SE SE SE SE SE
TRANSP WIND SPD.20 20 20 18 15 13
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
MAX TEMPERATURE.....AROUND 66.
MIN HUMIDITY........48 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 5 TO 10 MPH WITH GUSTS TO
AROUND 20 MPH.
CWR.................0 PERCENT.
MIXING HEIGHT.......3700 TO 4200 FT AGL.
TRANSPORT WINDS.....SOUTH 10 TO 20 MPH.
SMOKE DISPERSAL.....GOOD.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........32 32 32 32 33 34 35 37 38 40 45 51
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............46 48 50 52 56 60 63 65 66 66 64 61
RH..............86 83 80 77 66 58 52 48 48 48 52 56
20 FT WIND DIR..SE SE S S S SW SW SW SW S S S
20 FT WIND SPD..5 3 3 3 5 7 8 9 9 9 8 6
20 FT WIND GUST.12 10 10 10 12 14 16 18 20 20 17 15
MIX HGT (KFT)...0.5 0.6 0.7 0.8 1.6 2.4 3.3 3.6 3.9 4.2 3.0 1.8
TRANSP WIND DIR.SE S S S S S S S S S S S
TRANSP WIND SPD.9 8 8 8 10 13 15 16 17 17 15 13
THURSDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT).
MIN TEMPERATURE.....AROUND 50.
MAX HUMIDITY........86 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 5 TO 10 MPH WITH GUSTS TO
AROUND 20 MPH.
CWR.................0 PERCENT.
MIXING HEIGHT.......600 TO 1100 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 15 TO 20 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........56 58 59 61 62 63 64 66 69 71 69 68
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............59 57 57 56 56 55 55 54 54 53 52 51
RH..............60 64 64 66 69 72 74 80 80 83 86 86
20 FT WIND DIR..SE SE SE SE SE SE SE SE SE SE SE SE
20 FT WIND SPD..5 6 8 9 9 9 9 9 9 9 8 8
20 FT WIND GUST.14 16 18 21 21 21 20 20 20 20 18 16
MIX HGT (KFT)...0.7 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6
TRANSP WIND DIR.S SE SE SE SE S S S SE SE SE S
TRANSP WIND SPD.12 13 16 18 18 18 17 17 17 17 16 15
FRIDAY
SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT).
MAX TEMPERATURE.....AROUND 63.
MIN HUMIDITY........42 PERCENT.
WIND (20 FT)........SOUTH WINDS AROUND 10 MPH WITH GUSTS TO AROUND
15 MPH SHIFTING TO THE SOUTHWEST 10 TO 20 MPH
WITH GUSTS TO AROUND 35 MPH IN THE LATE MORNING
AND AFTERNOON.
CWR.................0 PERCENT.
MIXING HEIGHT.......100 TO 600 FT AGL EARLY IN THE MORNING.
TRANSPORT WINDS.....SOUTH AROUND 15 MPH EARLY IN THE MORNING.
SMOKE DISPERSAL.....POOR EARLY IN THE MORNING.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........66 65 63 62 57 51 46 45 45 44 42 40
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............M M M M M M M M M M M M
TEMP............51 52 53 54 56 59 60 62 63 62 61 58
RH..............86 83 83 80 72 62 55 50 44 44 42 42
20 FT WIND DIR..SE S S S S SW SW SW SW SW SW SW
20 FT WIND SPD..7 6 6 6 8 10 13 15 16 17 17 17
20 FT WIND GUST.15 14 14 15 18 22 26 30 32 35 36 36
MIX HGT (KFT)...0.6 M M M M M M M M M M M
TRANSP WIND DIR.S M M M M M M M M M M M
TRANSP WIND SPD.13 M M M M M M M M M M M
FORECASTER...13
REQUESTED BY...MADISON TOLLEY
TYPE OF REQUEST...PRESCRIBED
.TAG 2624078.0/UNR
.DELDT 10/20/26
.FORMATTERVERSION 2.0.0
.EMAIL MADISON.TOLLEY@USDA.GOV
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