666
FNUS73 KUNR 011538
FWSUNR
SPOT FORECAST FOR MOUNT RUSHMORE FIREWORKS PREPARATIONS...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE RAPID CITY SD
938 AM MDT WED JUL 1 2026
FORECAST IS BASED ON FORECAST START TIME OF 0500 MDT ON JULY 02.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
ISOLATED SHOWERS AND THUNDERSTORMS REMAIN POSSIBLE TODAY
(WEDNESDAY) AFTER 1200-1300 HOURS; COVERAGE WILL BE SPOTTY, HOWEVER,
GUSTY WINDS, HAIL, AND LIGHTNING WILL BE THE MAIN THREATS THIS AFTERNOON.
LIGHT, DIURNALLY DRIVEN WINDS EXPECTED TO START THE DAY THURSDAY.
TEMPERATURES WILL WARM INTO THE MID 80S WITH MINIMUM RH AROUND 28
PERCENT. OCCASIONAL GUSTS TO 12 TO 17 MPH ARE EXPECTED AFTER THE
INVERSION LIFTS AFTER 1000.
BETTER CHANCES FOR THUNDERSTORMS EXPECTED THURSDAY AFTERNOON INTO THE
EVENING HOURS. POTENTIAL FOR SEVERE WEATHER EXISTS WITH THREATS INCLUDING
LARGE HAIL, DAMAGING WINDS, AND LIGHTNING.
THREAT OF SHOWERS AND STORMS WILL LINGER OVERNIGHT THURSDAY WITH GUSTY,
ERRATIC WINDS NEAR ANY STORMS. OTHERWISE, EXPECT DIURNALLY DRIVEN
DOWNSLOPE/DOWNVALLEY FLOWS OVERNIGHT THURSDAY.
CHANCES AGAIN FOR THUNDERSTORMS, SOME OF WHICH MAY BE STRONG TO SEVERE,
EXPECTED FRIDAY AFTERNOON AND EVENING.
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). CHANCE OF
THUNDERSTORMS LATE IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 84.
MIN HUMIDITY........27-30 PERCENT.
WIND (20 FT)........GENERALLY SOUTHERLY UPSLOPE/UPVALLEY FLOW DURING
THE DAY WITH CONSIDERABLE TERRAIN VARIABILITY.
OCCASIONAL GUSTS 12 TO 17 MPH POSSIBLE THROUGH
PEAK HEATING. GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS.
CWR.................20 PERCENT.
MIXING HEIGHT.......9300 TO 9800 FT AGL INCREASING TO 10400 TO
10900 FT AGL LATE IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 20 TO 25 MPH SHIFTING TO THE NORTHEAST
AROUND 15 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....GOOD INCREASING TO EXCELLENT IN THE AFTERNOON,
THEN DECREASING TO GOOD LATE IN THE AFTERNOON.
TIME (MDT) 5AM 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........22 53 34 24 17 10 11 7 6 8 42 57 56
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.............0 20 20 20 20 20 20 20 20 20 20 20 20
TEMP............59 61 64 70 75 78 80 80 81 82 80 80 78
RH..............57 59 53 46 38 34 32 30 31 29 31 33 36
20 FT WIND DIR..SE SW SW SW S S S S S S SE SE SE
20 FT WIND SPD..3 3 3 3 5 6 6 6 5 5 3 3 3
20 FT WIND GUST.10 10 13 13 15 16 17 16 16 15 14 14 12
MIX HGT (KFT)...0.5 0.5 0.6 1.6 3.1 4.6 6.1 7.6 8.7 9.8 11 8.2 5.5
TRANSP WIND DIR.SW SW SW S S S S S S S S SE NE
TRANSP WIND SPD.16 18 21 21 21 21 18 17 18 20 20 17 15
THURSDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT) THEN BECOMING
PARTLY CLOUDY (35-45 PERCENT). SLIGHT CHANCE OF
THUNDERSTORMS IN THE EVENING AND OVERNIGHT.
MIN TEMPERATURE.....AROUND 60.
MAX HUMIDITY........75 PERCENT.
WIND (20 FT)........DIURNALLY DRIVEN TERRAIN VARIABILITY 2 TO 7 MPH.
GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
IN THE EVENING AND OVERNIGHT.
CWR.................0 PERCENT.
MIXING HEIGHT.......500 TO 1000 FT AGL.
TRANSPORT WINDS.....NORTH 10 TO 15 MPH SHIFTING TO THE EAST EARLY
IN THE EVENING, THEN SHIFTING TO THE SOUTHWEST
LATE IN THE EVENING SHIFTING TO THE WEST
OVERNIGHT SHIFTING TO THE NORTHWEST.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........62 52 68 75 63 49 32 36 36 46 48 50
WEATHER COV.....SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........SCH SCH SCH SCH SCH SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............74 73 70 66 65 63 62 61 61 61 61 60
RH..............41 44 49 58 60 67 72 75 70 68 65 64
20 FT WIND DIR..SE SE E NE N E W SW W W W W
20 FT WIND SPD..3 2 2 2 2 1 2 2 2 2 2 2
20 FT WIND GUST.12 10 8 8 7 7 7 7 7 7 7 7
MIX HGT (KFT)...2.8 2.0 1.2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.N NE E E SE S SW W NW NW NW W
TRANSP WIND SPD.13 10 9 9 10 10 12 10 10 9 8 7
FORECASTER...SE
REQUESTED BY...OWEN MURNANE
TYPE OF REQUEST...WILDFIRE
.TAG 2616576.0/UNR
.DELDT 07/01/26
.FORMATTERVERSION 2.0.0
.EMAIL ALAN_STOVER@NPS.GOV,OWEN_MURNANE@NPS.GOV
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