605
FNUS73 KUNR 301149
FWSUNR
SPOT FORECAST FOR MADNESS ON MAIN...WESTON COUNTY OEM
NATIONAL WEATHER SERVICE RAPID CITY SD
549 AM MDT SUN AUG 30 2026
FORECAST IS BASED ON FORECAST START TIME OF 0900 MDT ON AUGUST 30.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
MOST OF TODAY SHOULD LARGELY BE CHARACTERIZED BY A
MIX OF SUNSHINE AND PASSING CLOUDS, WARM TEMPERATURES, AND
SLIGHTLY BREEZY CONDITIONS, BUT POTENTIAL HAZARDS FROM HEAT AND
THUNDERSTORMS DO EXIST. FOR THE HEAT...HIGH TEMPERATURES ARE
FORECAST TO EXCEED 80 DEGREES BY 1 PM, TOP OUT AROUND 86 DEGREES,
AND DROP BELOW 80 DEGREES BY 7 PM. HUMIDITY WILL BE LOW, AND
THE BREEZE MAY KEEP APPARENT TEMPERATURES A FEW DEGREES BELOW
ACTUAL TEMPERATURES, RESULTING IN HEATRISK COMING IN AT
MINOR/YELLOW TODAY. THIS MEANS THE HEAT WILL PRIMARILY ONLY BE
HAZARDOUS TO THOSE WHO ARE EXTREMELY SENSITIVE, HAVE SPECIFIC
PREEXISTING MEDICAL CONDITIONS, OR LACK ADEQUATE COOLING AND
HYDRATION. FOR THE THUNDERSTORMS...CHANCES ARE MUCH HIGHER NORTH
OF NEWCASTLE, BUT WE DO HAVE SEVERAL HIGH-RESOLUTION MODELS THAT
CLIP THE NEWCASTLE AREA WITH A STORM BETWEEN 3 PM AND 7 PM...ABOUT
A 20 PERCENT CHANCE. IF A THUNDERSTORM MOVES THROUGH, THERE IS
THE POTENTIAL FOR IT TO BE STRONG TO SEVERE. PRIMARY THREATS WILL
BE DAMAGING WIND GUSTS OF 60 TO 75 MPH AND LIGHTNING, WITH A
LOWER/SECONDARY THREAT OF HAIL. WE DO RECOMMEND KEEPING AN EYE ON
THE RADAR TODAY, MONITORING FOR ANY WARNINGS THAT ARE ISSUED, AND
CHECKING BACK WITH THE NWS FOR UPDATES AS NEEDED. FINALLY, NEAR-
CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED IN THE AREA THIS
AFTERNOON DUE TO THE LOW HUMIDITY AND BREEZY WINDS.
TODAY
SKY/WEATHER.........MOSTLY SUNNY (30-45 PERCENT). A SLIGHT CHANCE
OF A THUNDERSTORM BETWEEN 3 PM AND 7 PM.
MAX TEMPERATURE.....AROUND 86 DEGREES.
MIN HUMIDITY........21 PERCENT.
CHANCE OF PCPN......20 PERCENT.
MAX APPARENT TEMP...82 DEGREES.
SURFACE WINDS (MPH).LIGHT WINDS BECOMING SOUTHWEST 6 TO 15 MPH WITH
GUSTS TO AROUND 25 MPH IN THE LATE MORNING,
THEN SHIFTING TO THE WEST AROUND 15 MPH WITH
GUSTS TO AROUND 26 MPH LATE IN THE AFTERNOON.
RAINFALL AMOUNT.....0.01 INCHES.
TIME (MDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........53 39 31 31 34 41 43 52 55
WEATHER COV..... SCH SCH SCH
WEATHER TYPE.... RW RW RW
TSTM COV........ SCH SCH SCH
CHC OF PCPN (%).0 0 0 0 0 5 15 20 20
TEMP............69 73 76 78 81 84 84 85 82
RH..............47 41 36 32 26 23 22 21 22
HEAT INDEX (F)..69 73 76 78 80 81 81 81 80
SURFACE WND DIR.SW SW SW SW W W W W W
SURFACE WND SPD.3 6 7 9 13 14 15 16 15
SURFACE WND GST.9 10 14 17 21 23 25 26 26
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (45-55 PERCENT), THEN BECOMING
PARTLY CLOUDY (20-35 PERCENT). A SLIGHT CHANCE
OF A THUNDERSTORM BEFORE 7 PM.
MIN TEMPERATURE.....AROUND 54 DEGREES.
MAX HUMIDITY........69 PERCENT.
CHANCE OF PCPN......15 PERCENT.
MAX APPARENT TEMP...79 DEGREES.
SURFACE WINDS (MPH).NORTHWEST WINDS 9 TO 14 MPH WITH GUSTS TO
AROUND 26 MPH, BECOMING LIGHT LATE IN THE
EVENING.
RAINFALL AMOUNT.....0.01 INCHES.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........55 51 46 45 43 32 28 29 29 22 15 19
WEATHER COV.....SCH
WEATHER TYPE....RW
TSTM COV........SCH
CHC OF PCPN (%).15 5 0 0 0 0 0 0 0 0 0 0
TEMP............80 78 72 68 66 64 63 61 59 58 56 56
RH..............24 28 34 40 40 43 44 48 51 57 62 64
HEAT INDEX (F)..79 78 72 68 66 64 63 61 59 58 56 56
SURFACE WND DIR.NW N N N N N NE NE E SE E E
SURFACE WND SPD.14 13 9 7 5 3 3 3 3 3 3 3
SURFACE WND GST.26 23 20 14 13 9 9 8 8 8 8 8
FORECASTER...KSMITH
REQUESTED BY...GILBERT NELSON
TYPE OF REQUEST...OTHER
.TAG 2605058.0/UNR
.DELDT 08/30/26
.FORMATTERVERSION 2.0.0
.EMAIL GNELSON@WESTONGOV.COM
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