428
FNUS73 KUNR 120258
FWSUNR
SPOT FORECAST FOR XU HILL...SDPRA
NATIONAL WEATHER SERVICE RAPID CITY SD
858 PM MDT TUE AUG 11 2026
FORECAST IS BASED ON FORECAST START TIME OF 2100 MDT ON AUGUST 11.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
AN OUTFLOW BOUNDARY FROM THUNDERSTORMS NORTH OF THE
FIRE WILL MOVE THROUGH THE FIRE BETWEEN NOW AND 945PM WITH WIND
GUSTS AROUND 50 MPH, MOST LIKELY FROM THE NORTH. ISOLATED
THUNDERSTORMS ARE POSSIBLE OVERNIGHT. EXCELLENT RH RECOVERY IS
EXPECTED TONIGHT.
ADDITIONAL THUNDERSTORMS WILL DEVELOP WEDNESDAY, ESPECIALLY IN THE
AFTERNOON AND EVENING WITH GUSTY, ERRATIC WINDS. ISOLATED
THUNDERSTORMS COULD BE SEVERE WITH LARGE HAIL. EXCELLENT RH RECOVERY
IS EXPECTED WEDNESDAY NIGHT.
REST OF TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT). CHANCE OF
THUNDERSTORMS LATE IN THE EVENING.
MIN TEMPERATURE.....AROUND 65.
MAX HUMIDITY........97 PERCENT.
WIND (20 FT)........NORTHEAST WINDS 10 TO 20 MPH SHIFTING TO THE
EAST AROUND 10 MPH EARLY IN THE MORNING.
WIND GUSTS FROM THE NORTH BETWEEN ABOUT
900PM AND 1000PM DUE TO THUNDERSTORM OUTFLOW.
GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS.
CWR.................20 PERCENT.
MIXING HEIGHT.......500 TO 1000 FT AGL.
TRANSPORT WINDS.....EAST 15 TO 25 MPH DECREASING TO AROUND 15 MPH
OVERNIGHT, THEN SHIFTING TO THE SOUTH
OVERNIGHT.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........31 27 40 40 39 35 32 44 43
WEATHER COV.....CHC CHC CHC
WEATHER TYPE....RW RW RW
TSTM COV........CHC CHC CHC
CWR.............20 20 20 20 20 20 20 20 20
TEMP............76 75 73 72 70 69 68 66 66
RH..............85 85 91 93 92 88 84 90 90
20 FT WIND DIR..NE NE NE NE NE NE NE NE E
20 FT WIND SPD..17 18 16 14 12 10 9 9 8
20 FT WIND GUST.50 50 24 21 18 16 13 13 12
MIX HGT (KFT)...0.7 0.7 0.8 0.7 0.6 0.5 0.5 0.5 0.5
TRANSP WIND DIR.E E E E E S S S S
TRANSP WIND SPD.23 21 17 15 13 10 9 9 9
WEDNESDAY
SKY/WEATHER.........PARTLY SUNNY (40-70 PERCENT) WITH A CHANCE
OF SHOWERS AND THUNDERSTORMS.
MAX TEMPERATURE.....AROUND 89.
MIN HUMIDITY........42 PERCENT.
WIND (20 FT)........EAST WINDS AROUND 10 MPH SHIFTING TO THE
SOUTHEAST WITH GUSTS TO AROUND 17 MPH IN THE
MORNING, THEN SHIFTING TO THE EAST 15 TO 20 MPH
WITH GUSTS TO AROUND 25 MPH LATE IN THE
MORNING. GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS.
CWR.................35 PERCENT.
MIXING HEIGHT.......4500 TO 5000 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 10 TO 15 MPH SHIFTING TO THE WEST
LATE IN THE MORNING, THEN SHIFTING TO THE
NORTHEAST 20 TO 25 MPH LATE IN THE MORNING
SHIFTING TO THE EAST 25 TO 30 MPH LATE IN THE
AFTERNOON.
SMOKE DISPERSAL.....GOOD INCREASING TO VERY GOOD LATE IN THE
AFTERNOON.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........62 78 48 39 40 54 70 69 75 65 55 91
WEATHER COV..... CHC CHC CHC CHC CHC CHC
WEATHER TYPE.... RW RW RW RW RW RW
TSTM COV........ SCH SCH SCH CHC CHC CHC
CWR.............30 30 30 30 30 30 30 30 30 30 30 30
TEMP............65 67 69 72 76 81 84 86 88 86 84 82
RH..............97 93 90 81 74 60 51 46 42 43 46 49
20 FT WIND DIR..E SE SE SE E E E E E E E E
20 FT WIND SPD..8 8 9 9 10 12 13 14 15 15 16 17
20 FT WIND GUST.12 12 14 15 17 18 20 22 23 25 25 25
MIX HGT (KFT)...0.4 0.8 1.2 1.5 2.2 3.0 3.7 4.1 4.6 5.0 4.4 3.7
TRANSP WIND DIR.S S SW SW W N NE NE E E E E
TRANSP WIND SPD.10 10 10 12 14 17 20 21 23 24 26 28
WEDNESDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). SHOWERS AND
CHANCE OF THUNDERSTORMS IN THE EVENING, THEN
SLIGHT CHANCE OF THUNDERSTORMS OVERNIGHT.
SHOWERS LIKELY OVERNIGHT.
MIN TEMPERATURE.....AROUND 61.
MAX HUMIDITY........100 PERCENT.
WIND (20 FT)........NORTHEAST WINDS 10 TO 20 MPH. GUSTS UP TO 26
MPH IN THE EVENING. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS.
CWR.................90 PERCENT.
MIXING HEIGHT.......700 TO 1200 FT AGL.
TRANSPORT WINDS.....EAST 20 TO 30 MPH DECREASING TO AROUND 20 MPH
OVERNIGHT.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........99 99 92 88 95 90 86 77 66 82 76 75
WEATHER COV.....DEF DEF DEF DEF DEF DEF LKY LKY LKY LKY LKY LKY
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........CHC CHC CHC CHC CHC CHC SCH SCH SCH
CWR.............90 90 90 90 90 90 90 90 90 90 90 90
TEMP............79 76 72 69 67 66 66 64 63 63 63 61
RH..............58 62 73 84 87 90 90 100 100 100 100 100
20 FT WIND DIR..NE E NE NE NE E E NE NE NE NE NE
20 FT WIND SPD..18 18 17 16 16 14 13 10 10 10 12 12
20 FT WIND GUST.26 25 24 22 22 18 17 16 15 16 16 16
MIX HGT (KFT)...3.0 2.4 1.7 1.0 0.9 0.8 0.7 0.9 1.1 1.3 1.2 1.0
TRANSP WIND DIR.E E NE NE NE E E E E E E E
TRANSP WIND SPD.29 28 25 23 22 20 18 17 17 16 16 16
THURSDAY
SKY/WEATHER.........CLOUDY (85-95 PERCENT). CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS LIKELY AND CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 77.
MIN HUMIDITY........62 PERCENT.
WIND (20 FT)........NORTHEAST WINDS AROUND 15 MPH WITH GUSTS TO
AROUND 24 MPH SHIFTING TO THE EAST 15 TO 25 MPH
WITH GUSTS TO AROUND 32 MPH IN THE AFTERNOON.
GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS.
CWR.................30 PERCENT.
MIXING HEIGHT.......4900 TO 5400 FT AGL.
TRANSPORT WINDS.....EAST 20 TO 25 MPH INCREASING TO SOUTHEAST 30 TO
35 MPH LATE IN THE MORNING.
SMOKE DISPERSAL.....GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........98 100 92 84 82 81 79 78 77 76 80 83
WEATHER COV.....CHC CHC CHC CHC CHC CHC LKY LKY LKY LKY LKY LKY
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........ SCH SCH SCH CHC CHC CHC
CWR.............30 30 30 30 30 30 30 30 30 30 30 30
TEMP............63 63 64 66 68 69 71 72 74 75 76 76
RH..............97 100 97 90 84 81 76 73 66 64 62 62
20 FT WIND DIR..NE NE NE E E E E E E E E E
20 FT WIND SPD..12 12 12 13 13 14 15 17 20 21 21 22
20 FT WIND GUST.16 16 17 20 22 24 26 29 31 32 32 32
MIX HGT (KFT)...0.9 1.3 1.7 2.1 3.0 4.0 5.0 5.2 5.3 5.4 5.0 4.6
TRANSP WIND DIR.E E SE SE SE SE SE SE SE SE SE SE
TRANSP WIND SPD.16 18 20 22 24 26 29 31 32 33 35 35
FORECASTER...EH
REQUESTED BY...DUTY OFFICER
TYPE OF REQUEST...WILDFIRE
.TAG 2619492.0/UNR
.DELDT 08/11/26
.FORMATTERVERSION 2.0.0
.EMAIL COLYNN.CONDON@BIA.GOV
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