226
FNUS73 KUNR 292235
FWSUNR
SPOT FORECAST FOR DUHAMEL FIRE...PENNINGTON COUNTY EMERGENCY MANAGEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
435 PM MDT WED JUL 29 2026
FORECAST IS BASED ON FORECAST START TIME OF 1700 MDT ON JULY 29.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
..HEAT ADVISORY IN EFFECT UNTIL 7 PM MDT THIS EVENING
DISCUSSION
MAX TEMP THIS AFTERNOON OVER THE SPOT LOCATION IS
AROUND 100F WITH AN RH AROUND 30%. WINDS OVER THE NEXT COUPLE
HOURS WILL BE OUT OF THE SOUTHEAST WITH GUSTS TO ABOUT 30 MPH. A
LINE OF THUNDERSTORMS IS ABOUT TO ENTERS WESTERN SD FROM WYOMING,
AND SOME STORMS ARE BUILDING AHEAD OF IT OVER THE BLACK HILLS.
STORMS ARE EXPECTED TO BE AROUND OR OVER THE SPOT LOCATION BETWEEN
00Z AND 04Z. MAIN THREATS WITH THESE STORMS WILL BE LIGHTNING,
GUSTY/ERRATIC WINDS, AND POSSIBLE HEAVY RAINFALL.
GIVEN THE MOISTURE IN THE REGION, RH RECOVERY WILL BE VERY GOOD,
WITH OVERNIGHT RH'S 90 TO 100%. ONCE THE INITIAL LINE OF
SHOWERS/STORMS MOVES THROUGH THIS EVENING, THERE WILL BE A BREAK
IN PRECIPITATION BUT MORE SHOWERS/STORMS ARE EXPECTED THURSDAY
MORNING AND AFTERNOON.
A COOL FRONT WILL CROSS THE REGION OVERNIGHT INTO THURSDAY
MORNING. STRONG WINDS AREN'T EXPECTED WITH THIS FRONT BUT WINDS
WILL BE OUT OF THE NORTH TOMORROW WITH SLIGHTLY COOLER HIGHS AND
HIGHER AFTERNOON HUMIDITIES.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT).
MAX TEMPERATURE.....AROUND 101.
MIN HUMIDITY........28 PERCENT.
WIND (20 FT)........SOUTH WINDS AROUND 15 MPH WITH GUSTS TO AROUND
25 MPH.
CWR.................0 PERCENT.
MIXING HEIGHT.......8000 TO 8500 FT AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 25 MPH.
SMOKE DISPERSAL.....EXCELLENT.
TIME (MDT) 5PM
SKY (%).........35
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0
TEMP............97
RH..............29
20 FT WIND DIR..S
20 FT WIND SPD..15
20 FT WIND GUST.25
MIX HGT (KFT)...8.5
TRANSP WIND DIR.SE
TRANSP WIND SPD.24
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT) THEN BECOMING
MOSTLY CLOUDY (55-65 PERCENT) THEN BECOMING
PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING
MOSTLY CLOUDY (75-85 PERCENT). PATCHY SMOKE
EARLY IN THE EVENING. CHANCE OF SHOWERS AND
THUNDERSTORMS EARLY IN THE EVENING.
MIN TEMPERATURE.....AROUND 68.
MAX HUMIDITY........97 PERCENT.
WIND (20 FT)........SOUTH WINDS AROUND 15 MPH WITH GUSTS TO AROUND
24 MPH SHIFTING TO THE SOUTHEAST WITH GUSTS TO
AROUND 17 MPH LATE IN THE EVENING, THEN
SHIFTING TO THE SOUTH WITH GUSTS TO AROUND 14
MPH OVERNIGHT SHIFTING TO THE SOUTHWEST AFTER 3
AM SHIFTING TO THE WEST. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS EARLY IN THE
EVENING.
CWR.................40 PERCENT.
MIXING HEIGHT.......500 TO 1000 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 15 TO 25 MPH SHIFTING TO THE SOUTH 10
TO 15 MPH OVERNIGHT.
SMOKE DISPERSAL.....FAIR DECREASING TO POOR IN THE LATE EVENING AND
OVERNIGHT.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........28 37 56 63 47 74 70 77 70 81 87 82
WEATHER COV.....PTY PTY CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC
WEATHER TYPE....SMK SMK RW RW RW RW RW RW RW RW RW RW
TSTM COV........ CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC
CWR.............40 40 40 40 40 40 40 40 40 40 40 40
TEMP............94 90 85 81 78 76 75 73 72 72 70 69
RH..............33 39 50 58 67 71 74 79 81 84 90 90
20 FT WIND DIR..S SW SW S E SE S S SW SW W W
20 FT WIND SPD..14 13 12 12 10 9 8 8 7 7 6 6
20 FT WIND GUST.24 21 20 18 17 14 14 13 12 10 9 9
MIX HGT (KFT)...7.1 4.9 2.7 0.5 0.5 0.5 0.5 0.5 0.6 0.6 0.6 0.6
TRANSP WIND DIR.SE SE SE SE S S S S S S S S
TRANSP WIND SPD.23 23 22 22 21 20 17 15 13 10 9 9
THURSDAY
SKY/WEATHER.........CLOUDY (85-95 PERCENT) THEN BECOMING MOSTLY
CLOUDY (65-75 PERCENT) THEN BECOMING MOSTLY
SUNNY (40-50 PERCENT). SLIGHT CHANCE OF SHOWERS
AND THUNDERSTORMS IN THE MORNING, THEN CHANCE
OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 89.
MIN HUMIDITY........46 PERCENT.
WIND (20 FT)........SOUTH WINDS AROUND 10 MPH SHIFTING TO THE NORTH
WITH GUSTS TO AROUND 12 MPH IN THE MORNING,
THEN INCREASING TO 10 TO 20 MPH WITH GUSTS TO
AROUND 25 MPH IN THE AFTERNOON INCREASING TO
AROUND 20 MPH WITH GUSTS TO AROUND 28 MPH LATE
IN THE AFTERNOON. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS.
CWR.................35 PERCENT.
MIXING HEIGHT.......5900 TO 6400 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 10 MPH SHIFTING TO THE EAST EARLY
IN THE MORNING, THEN SHIFTING TO THE NORTH 15
TO 25 MPH LATE IN THE MORNING INCREASING TO 25
TO 30 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....VERY GOOD.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........96 82 61 75 75 78 68 50 48 42 36 44
WEATHER COV.....SCH SCH SCH SCH SCH SCH 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 SCH SCH SCH CHC CHC CHC CHC CHC CHC
CWR.............30 30 30 30 30 30 30 30 30 30 30 30
TEMP............68 72 73 75 79 82 83 84 85 86 85 85
RH..............97 87 84 82 74 67 61 57 53 51 51 50
20 FT WIND DIR..S NE N N N N N N N N N N
20 FT WIND SPD..6 5 5 5 5 6 8 12 14 15 16 18
20 FT WIND GUST.9 8 8 8 10 12 14 18 23 24 25 28
MIX HGT (KFT)...0.6 1.0 1.4 1.8 2.7 3.5 4.3 5.0 5.7 6.4 6.3 6.3
TRANSP WIND DIR.S S E NE NE NE N N N N N N
TRANSP WIND SPD.9 8 8 9 10 13 15 18 21 23 25 26
FORECASTER...AD
REQUESTED BY...DUSTIN WILLETT
TYPE OF REQUEST...WILDFIRE
.TAG 2618609.0/UNR
.DELDT 07/29/26
.FORMATTERVERSION 2.0.0
.EMAIL DUSTIN.WILLETT@PENNCOSD.GOV
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