459
FNUS73 KUNR 271342
FWSUNR
SPOT FORECAST FOR ANTIHORSE ALPHA...USFS
NATIONAL WEATHER SERVICE RAPID CITY SD
742 AM MDT TUE OCT 27 2026
FORECAST IS BASED ON IGNITION TIME OF 0000 MDT ON OCTOBER 28.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
THIS MORNING STARTS OFF COOL AND MOIST WITH AREAS OF
FOG AND LOW CLOUDS, BUT EVERYTHING SHOULD PROGRESSIVELY BURN OFF
BY ABOUT 10 AM. THEREAFTER, TODAY WILL BE VERY DIFFERENT THAN
YESTERDAY WITH TEMPERATURES SURGING INTO THE 50S AND MINIMUM
AFTERNOON RELATIVE HUMIDITY VALUES DROPPING AS LOW AS ABOUT 30
PERCENT. COMBINED WITH BREEZY WEST-SOUTHWEST WINDS GUSTING AS HIGH
AS 30 MPH (ESPECIALLY BETWEEN ABOUT 10 AM AND 5 PM), FIRE WEATHER
CONDITIONS WILL BE A BIT ELEVATED TODAY. A VERY WEAK DISTURBANCE
CROSSES THE AREA WEDNESDAY MORNING AND A FEW HIGH-RESOLUTION
MODELS ARE TRYING TO HINT AT A SHOWER OR TWO OVER THE BURN, BUT
CONFIDENCE IN THIS IS VERY LOW. IF ANYTHING OCCURS, WETTING
PRECIPITATION IS NOT EXPECTED. SOMEWHAT ZONAL WEST-SOUTHWEST FLOW
ALOFT IS THEN EXPECTED ACROSS THE REGION WEDNESDAY, THURSDAY, AND
FRIDAY, WITH ONLY A FEW ADDITIONAL MINOR WAVES DRIFTING THROUGH.
AT THIS TIME, NONE OF THESE LITTLE WAVES/DISTURBANCES LOOK
ORGANIZED ENOUGH TO PRODUCE PERIODS OF STRONG WINDS OR ANY
PRECIPITATION, WITH MILD DAYTIME TEMPERATURES IN THE 50S SUPPORTED
THROUGHOUT THE PERIOD. (A SWITCH IN DIURNAL SURFACE WINDS TO MORE
SOUTHEASTERLY ON FRIDAY MAY RESULT IN A NOTABLE INCREASE IN
MINIMUM AFTERNOON RELATIVE HUMIDITY VALUES COMPARED TO WEDNESDAY
AND THURSDAY.) WINDS BOTH WEDNESDAY AND THURSDAY LOOK LIGHTER
COMPARED TO TODAY.
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT) THEN BECOMING
MOSTLY CLOUDY (60-70 PERCENT).
MIN TEMPERATURE.....AROUND 38 DEGREES.
MAX HUMIDITY........85 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS AROUND 9 MPH SHIFTING TO THE
SOUTHEAST LATE IN THE EVENING, THEN SHIFTING TO
THE WEST EARLY IN THE MORNING. GUSTS UP TO 14
MPH.
CWR.................0 PERCENT.
MIXING HEIGHT.......500 TO 1000 FT AGL.
TRANSPORT WINDS.....WEST 10 TO 20 MPH SHIFTING TO THE SOUTH AROUND
10 MPH LATE IN THE EVENING.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........13 14 6 22 33 39 45 45 50 61 71 67
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............46 45 44 43 43 43 43 43 42 40 40 40
RH..............35 35 38 41 45 49 53 57 65 76 76 76
20 FT WIND DIR..W W W W SW S SE SE SE SE SE W
20 FT WIND SPD..7 6 6 6 6 5 5 5 5 5 5 5
20 FT WIND GUST.16 15 14 13 12 12 12 10 10 10 10 12
MIX HGT (KFT)...0.6 0.6 0.6 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.W W W W SW S S S S S S S
TRANSP WIND SPD.16 13 12 12 10 10 10 9 9 9 9 9
WEDNESDAY
SKY/WEATHER.........SUNNY (20-30 PERCENT).
MAX TEMPERATURE.....AROUND 52 DEGREES.
MIN HUMIDITY........39 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 5 TO 10 MPH SHIFTING TO THE
WEST IN THE AFTERNOON. GUSTS UP TO 18 MPH.
CWR.................0 PERCENT.
MIXING HEIGHT.......5500 TO 6000 FT AGL.
TRANSPORT WINDS.....WEST 10 TO 20 MPH DECREASING TO 10 TO 15 MPH
LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....VERY GOOD.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........39 28 45 20 5 5 1 3 1 1 2 2
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............38 38 38 39 43 46 49 50 50 51 50 47
RH..............82 82 82 85 70 58 48 44 42 41 39 44
20 FT WIND DIR..NW N NW NW W W W W W W W W
20 FT WIND SPD..5 5 5 6 7 7 8 8 8 8 7 5
20 FT WIND GUST.13 13 13 14 15 16 17 17 18 18 16 12
MIX HGT (KFT)...0.5 0.6 0.8 0.9 2.0 3.0 4.1 4.7 5.4 6.0 4.1 2.2
TRANSP WIND DIR.SW SW W W W W W W W W W W
TRANSP WIND SPD.10 12 13 15 18 23 25 24 22 17 14 9
WEDNESDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....AROUND 35.
MAX HUMIDITY........75 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 5 TO 10 MPH WITH GUSTS TO
AROUND 15 MPH SHIFTING TO THE SOUTH OVERNIGHT.
CWR.................0 PERCENT.
MIXING HEIGHT.......300 TO 800 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 10 MPH SHIFTING TO THE EAST
EARLY IN THE EVENING, THEN SHIFTING TO THE
SOUTHEAST LATE IN THE EVENING.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........3 2 4 6 7 9 10 10 10 10 8 6
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............44 40 39 39 39 40 40 39 37 36 35 35
RH..............47 52 54 57 57 55 55 59 67 72 75 72
20 FT WIND DIR..SW E E E E SE SE SE S S S S
20 FT WIND SPD..2 3 5 6 7 7 7 7 7 7 6 5
20 FT WIND GUST.7 8 9 12 13 14 14 14 14 14 13 10
MIX HGT (KFT)...0.3 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.W N E E SE SE SE SE SE SE SE S
TRANSP WIND SPD.7 7 8 10 12 12 13 13 13 13 13 12
THURSDAY
SKY/WEATHER.........SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....AROUND 55.
MIN HUMIDITY........35 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 10 MPH WITH GUSTS TO
15 MPH.
CWR.................0 PERCENT.
MIXING HEIGHT.......3400 TO 3900 FT AGL.
TRANSPORT WINDS.....SOUTH 10 TO 20 MPH.
SMOKE DISPERSAL.....FAIR.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........4 5 5 6 6 7 7 12 17 22 26 29
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............35 36 36 38 42 47 51 53 55 55 53 50
RH..............72 69 72 67 57 47 41 38 35 35 38 42
20 FT WIND DIR..S S SW SW SW SW SW SW SW SW SW SE
20 FT WIND SPD..3 3 3 3 5 6 7 7 7 6 5 3
20 FT WIND GUST.9 8 8 9 12 13 15 16 16 15 13 9
MIX HGT (KFT)...0.5 0.6 0.7 0.8 1.5 2.3 3.0 3.3 3.6 3.9 2.7 1.5
TRANSP WIND DIR.S S S S S SW SW SW SW SW S SE
TRANSP WIND SPD.12 9 8 8 10 15 17 17 16 14 10 8
FORECASTER...13
REQUESTED BY...MADISON TOLLEY
TYPE OF REQUEST...PRESCRIBED
.TAG 2624654.0/UNR
.DELDT 10/27/26
.FORMATTERVERSION 2.0.0
.EMAIL MADISON.TOLLEY@USDA.GOV
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