A severe thunderstorm produced wind gusts around 60 mph across central Shannon County.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS UNR wrote it up.
A severe thunderstorm produced wind gusts around 60 mph across central Shannon County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Rapid City, SD wrote its last area forecast discussion before the first event at Aug 9, 1:40 PM MST, 35 minutes earlier.
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 240 PM MDT SUN AUG 9 2009 .DISCUSSION...CURRENT SURFACE ANALYSIS SHOWS WEAK HIGH PRESSURE OVER WESTERN ND...WITH COLD FRONT OVER THE UPPER MIDWEST AND CENTRAL PLAINS. UPPER LEVEL ANALYSIS HAS LOW AND UPPER TROF LOCATED OVER WESTERN SD...MOVING EAST-NORTHEAST. LARGE AREA OF SHOWERS AND STORMS IS MOVING EAST-NORTHEAST INTO NORTH CENTRAL SD. MORE SCATTERED ACTIVITY IS ROTATING AROUND THE LOW AND MOVING ACROSS SOUTHEASTERN MT...EASTERN WY...AND FAR WESTERN SD. SKIES ARE MOSTLY CLOUDY ACROSS A GOOD PART OF THE AREA WITH TEMPS MAINLY IN THE 60S ACROSS NORTHEAST WY AND FAR WESTERN SD...70S TOWARD SOUTH CENTRAL SD. MAINLY DRY AND MUCH WARMER WEATHER IS ON THE WAY FOR THE UPCOMING WEEK AS WEAK RIDGING BUILDS OVER THE REGION. TEMPERATURES WILL BE ABOVE AVERAGE LEVELS FROM TUESDAY THROUGH AT LEAST FRIDAY. ANY DECENT CHANCES FOR PCPN ARE NOT EXPECTED UNTIL SOMETIME NEXT WEEKEND. FOR LATE THIS AFTERNOON AND EARLY EVENING...ANY REMAINING SHOWERS AND STORMS WILL EITHER DISSIPATE OR SLIDE EAST OF THE AREA DURING THIS TIME. COULD STILL SEE A STRONG OR MARGINALLY SEVERE STORM OR TWO...ESPECIALLY ACROSS SOUTHERN AND CENTRAL SD. TROF WILL MOVE EAST OF THE REGION OVERNIGHT AS SKIES CLEAR OUT. LOWS WILL BE IN THE 50S...SOME 40S IN THE BLACK HILLS. WARMUP WILL COMMENCE ON MONDAY AS RIDGING BUILDS ACROSS THE NORTHERN ROCKIES. SKIES WILL BE MOSTLY SUNNY WITH HIGHS GENERALLY IN THE 80S ACROSS THE PLAINS...WITH SOME 70S IN THE BLACK HILLS. WOULD NOT BE TOO SURPRISED TO SEE A SHOWER OR STORM DEVELOP ACROSS FAR SOUTHERN SD IN THE AFTERNOON...WHERE SOME RESIDUAL MOISTURE AND INSTABILITY WILL REMAIN...BUT CHANCES LOOK TOO LOW TO WARRANT A MENTION IN THE FORECAST AT THIS POINT. AS RIDGE SLIDES A BIT FURTHER EAST ON TUESDAY...TEMPS WILL WARM INTO THE 90S UNDER SUNNY SKIES ACROSS MUCH OF THE PLAINS...WITH 80S IN THE BLACK HILLS. EXTENDED...BROAD UPPER RIDGE DEVELOPS OVER THE NORTHERN PLAINS EARLY NEXT WEEK...WITH DRY WEATHER AND TEMPERATURES ABOVE AVERAGE. HEIGHTS BEGIN TO LOWER TOWARDS THE END OF THE WEEK AS TROF MOVES INTO THE NORTHWESTERN U.S. SOUTHWEST FLOW OVER THE NORTHERN PLAINS MAY RESULT IN SOME ISOLATED THUNDERSTORM ACTIVITY. UPPER TROF MOVES ACROSS NORTHERN PLAINS NEXT WEEKEND WITH A BETTER CHANCE OF THUNDERSTORMS. && .AVIATION...SCATTERED SHOWERS AND THUNDERSTORMS WILL DECREASE IN COVERAGE ACROSS THE AREA THIS EVENING. LCL MVFR CIGS/VSBY WITH THE THUNDERSTORMS...OTHERWISE VFR CONDITIONS EXPECTED. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...NONE. WY...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 1056 AM MDT SUN AUG 9 2009 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-101300- BENNETT-BUTTE-CENTRAL BLACK HILLS-CUSTER CO PLAINS-FALL RIVER-HAAKON- HARDING-HERMOSA FOOT HILLS-JACKSON-MELLETTE-NORTHEASTERN CROOK- NORTHERN BLACK HILLS-NORTHERN CAMPBELL-NORTHERN FOOT HILLS- NORTHERN MEADE CO PLAINS-PENNINGTON CO PLAINS-PERKINS-RAPID CITY- SHANNON-SOUTHERN BLACK HILLS-SOUTHERN CAMPBELL-SOUTHERN FOOT HILLS- SOUTHERN MEADE CO PLAINS-STURGIS/PIEDMONT FOOT HILLS-TODD-TRIPP- WESTERN CROOK-WESTON-WYOMING BLACK HILLS-ZIEBACH- 1056 AM MDT (1156 AM CDT) SUN AUG 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS MUCH OF THE AREA THROUGH EARLY THIS EVENING. THERE IS A SLIGHT RISK FOR A SEVERE THUNDERSTORM OR TWO ACROSS SOUTH CENTRAL SOUTH DAKOTA THIS AFTERNOON. LARGE HAIL AND STRONG WIND GUSTS WILL BE THE MAIN THREATS. ELSEWHERE...A FEW STORMS COULD BE STRONG WITH SMALL HAIL AND GUSTY WINDS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS ON SATURDAY. WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 1228 PM MDT SUN AUG 9 2009 SDZ014-032-091930- HAAKON-ZIEBACH- INCLUDING THE CITIES OF...CHERRY CREEK...KIRLEY... OTTUMWA AND SOUTH EAGLE BUTTE 1228 PM MDT SUN AUG 9 2009 ...STRONG THUNDERSTORMS APPROACHING THE AREA... AT 1227 PM MDT...DOPPLER RADAR INDICATED A LINE OF THUNDERSTORMS WITH HEAVY RAIN...SMALL HAIL...AND FREQUENT CLOUD TO GROUND LIGHTNING. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 14 MILES NORTHWEST OF CHERRY CREEK TO 5 MILES NORTH OF OTTUMWA...AND WERE MOVING NORTHEAST AT 35 MPH. LOCATIONS IMPACTED INCLUDE... CHERRY CREEK... KIRLEY... SOUTH EAGLE BUTTE... CARSTENS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 122 PM MDT SUN AUG 9 2009 SDZ027-029-041-074-092015- FALL RIVER-HERMOSA FOOT HILLS-SOUTHERN BLACK HILLS- SOUTHERN FOOT HILLS- INCLUDING THE CITIES OF...ANGOSTURA RESERVOIR...BUFFALO GAP... COLD BROOK RESERVOIR AND COTTONWOOD SPRINGS DAM 122 PM MDT SUN AUG 9 2009 ...STRONG THUNDERSTORM APPROACHING THE AREA... AT 122 PM MDT...DOPPLER RADAR INDICATED A THUNDERSTORM WITH PENNY SIZED HAIL...WIND GUSTS TO 50 MPH...AND FREQUENT CLOUD TO GROUND LIGHTNING. THIS STORM WAS LOCATED 8 MILES SOUTHEAST OF DEWEY...OR 11 MILES NORTHWEST OF EDGEMONT...AND WAS MOVING EAST AT 25 MPH. LOCATIONS IMPACTED INCLUDE... COTTONWOOD SPRINGS DAM... DOWNTOWN HOT SPRINGS...COLD BROOK RESERVOIR...MAVERICK JUNCTION AND ANGOSTURA RESERVOIR... CARSTENS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 230 PM MDT SUN AUG 9 2009 SDZ041-042-092130- FALL RIVER-SHANNON- INCLUDING THE CITIES OF...MANDERSON...ROCKYFORD AND SHARPS CORNER 230 PM MDT SUN AUG 9 2009 ...STRONG THUNDERSTORM APPROACHING THE AREA... AT 229 PM MDT...DOPPLER RADAR INDICATED A THUNDERSTORM WITH PENNY SIZED HAIL...WIND GUSTS TO 50 MPH...AND FREQUENT CLOUD TO GROUND LIGHTNING. THIS STORM WAS LOCATED 28 MILES WEST OF ROCKYFORD...OR 23 MILES EAST OF DOWNTOWN HOT SPRINGS...AND WAS MOVING EAST AT 40 MPH. LOCATIONS IMPACTED INCLUDE... ROCKYFORD... MANDERSON... SHARPS CORNER... CARSTENS
The Rapid City radar (KUDX), 91 km away, was scanning. The volume nearest the first event began at 21:17 UTC.
2 thunderstorm wind. Local standard time, as filed.
Corn crops were damaged by the wind.
Wind gusts were estimated at 60 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2009Every state in 2009This day in weather historyWarnings in South Dakota, August 2009
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 179409, 179410.