Strong wind gusts accompanied a severe thunderstorm that tracked along Interstate 90 in northern Jackson County.
Every event with a place to put it. Tap one for its entry below.
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.
Strong wind gusts accompanied a severe thunderstorm that tracked along Interstate 90 in northern Jackson 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 1, 6:09 PM MST, 3 hours 6 minutes earlier.
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 709 PM MDT MON AUG 1 2011 .DISCUSSION...COLD FRONT/OUTFLOW CONTINUES TO PUSH THROUGH WRN SD AND EXTENDS FROM NEAR A KADOKA TO MARTIN LINE AT 01Z. SCATTERED CONVECTION (SUB SEVERE) WILL CONTINUE ACROSS THE AREA THE REST OF THIS BEHIND THE BOUNDARY SO HAVE CANCELLED THE SEVERE THUNDERSTORM WATCH. HEAT ADVISORY HAS ALSO BEEN CANCELLED. && AVIATION...COLD FRONT PUSHING THROUGH WESTERN SOUTH DAKOTA THIS EVENING WILL PRODUCE WIND GUSTS TO 35 KTS. SCATTERED TSTMS WILL ALSO CONTINUE...BUT MOSTLY VFR CONDITIONS EXPECTED THE REST OF TONIGHT. && .PREV DISCUSSION... /ISSUED 215 PM MDT MON AUG 1 2011/ DISCUSSION...20Z SURFACE ANALYSIS HAS LOW PRESSURE OVER NORTH CENTRAL SOUTH DAKOTA WITH A TROF EXTENDING SOUTHWARD THROUGH KPHP AND KIEN AS WELL AS A COLD FRONT NEAR THE SD/ND BORDER JUST THROUGH K2WX. RADAR IMAGERY SHOWS SEVERE STORMS POPPING UP OVER NORTHWESTERN SOUTH DAKOTA NEAR THE COLD FRONT. WATER VAPOR SHOWS SHORTWAVE ENERGY OVER WY WITH MONSOONAL FLOW HEADING TOWARD ND/SD. OVERALL MODELS IN FAIRLY GOOD AGREEMENT WITH NO MAJOR DIFFERENCES. FOR TONIGHT...SHORTWAVE WILL CROSS NORTHERN PORTIONS OF FORECAST AREA AS MONSOONAL MOISTURE INTERACTS WITH THE WAVE AND COLD FRONT CREATING STRONG TO SEVERE THUNDERSTORMS. THE STRONGEST SHEAR THIS EVENING WILL BE OVER NORTHWEST/CENTRAL SOUTH DAKOTA AND WITH AN INVERTED-V SOUNDING...INDICATES THE MAIN THREAT WILL BE SEVERE WIND GUSTS. HOWEVER THE COLD FRONT SWINGS THROUGH THE AREA...ALLOWING SOME REPRIEVE FROM THE HEAT FOR CENTRAL AND SOUTH CENTRAL SOUTH DAKOTA. FOR TUESDAY...HIGH PRESSURE SETTLES OVER THE AREA WITH COOLER AND DRIER AIR IN THE WAKE OF THE COLD FRONT. HOWEVER RETURN FLOW IN THE AFTERNOON/EVENING COMBINED WITH LIMITED INSTABILITY AND WEAK FORCING WILL CREATE ANOTHER CHANCE FOR THUNDERSTORMS MAINLY OVER NORTHEASTERN WYOMING AND FAR WESTERN SOUTH DAKOTA. FOR TUESDAY NIGHT...STORMS WILL SUSTAIN DUE TO THETA-E ADVECTION AND A LOW LEVEL JET THAT DEVELOPS ACROSS NORTHEASTERN WYOMING INTO SOUTHEASTERN MONTANA. TEMPERATURES OVERNIGHT WILL BE AROUND AVERAGE. WEAK UPPER HIGH OVER TEXAS CREATES A SOUTHWEST FLOW PATTERN BRINGING MONSOONAL MOISTURE BACK INTO THE FORECAST AREA BEGINNING ON WEDNESDAY. SHORTWAVES EMBEDDED IN THE FLOW WILL CREATE AN UNSETTLED WEATHER PATTERN THROUGH THE EXTENDED FORECAST...LEADING TO A DAILY CHANCE FOR THUNDERSTORMS AND SEASONAL TEMPERATURES. AVIATION...COLD FRONT WILL PUSH THROUGH WESTERN SOUTH DAKOTA THIS EVENING PRODUCING SCATTERED THUNDERSTORMS AND GUSTY NORTHWEST WINDS. VFR CONDITIONS ARE EXPECTED WITH IFR/MVFR IN THE VICINITY OF STORMS. THE STRONGEST WINDS WILL BE ACROSS THE SOUTH DAKOTA PLAINS WITH SPEEDS OF 20 TO 25 KTS WHEN THE FRONT PASSES. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...NONE. WY...NONE. && JOHNSON
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 716 PM MDT MON AUG 1 2011 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-021300- 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- 716 PM MDT (816 PM CDT) MON AUG 1 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL CONTINUE TONIGHT...BUT WIDESPREAD SEVERE WEATHER IS NOT EXPECTED. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY CHANCES FOR THUNDERSTORMS WILL CONTINUE EACH DAY THROUGH THE UPCOMING WEEKEND. ALTHOUGH WIDESPREAD SEVERE THUNDERSTORMS ARE NOT EXPECTED AT THIS TIME...AN OCCASIONAL SEVERE STORM WITH LARGE HAIL OR DAMAGING WIND GUSTS REMAINS POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
507 PM MDT MON AUG 01 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0457 PM HAIL DUPREE 45.05N 101.59W
08/01/2011 E2.50 INCH ZIEBACH SD LAW ENFORCEMENT
ALSO HAD 40 TO 50 MPH WINDS.
&&
SMITHSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 554 PM MDT MON AUG 1 2011 SDZ031-073-020045- PENNINGTON CO PLAINS SD-SOUTHERN MEADE CO PLAINS SD- 554 PM MDT MON AUG 1 2011 ...SIGNIFICANT WEATHER ADVISORY FOR EXTREME NORTHEASTERN PENNINGTON AND CENTRAL MEADE COUNTIES UNTIL 645 PM MDT... AT 551 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 6 MILES NORTHWEST OF ELM SPRINGS...OR 38 MILES NORTHEAST OF DOWNTOWN RAPID CITY...MOVING EAST AT 25 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... AREAS NORTHEAST OF ELM SPRINGS... THIS STORM MAY INTENSIFY...AND A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THIS AREA. BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. BUNKERS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 604 PM MDT MON AUG 1 2011 SDZ031-073-020045- PENNINGTON CO PLAINS SD-SOUTHERN MEADE CO PLAINS SD- 604 PM MDT MON AUG 1 2011 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PENNINGTON AND EASTERN MEADE COUNTIES UNTIL 645 PM MDT... AT 601 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR ELM SPRINGS...OR 42 MILES NORTHEAST OF DOWNTOWN RAPID CITY...MOVING EAST AT 25 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... AREAS NORTHEAST OF ELM SPRINGS... AREAS NORTH OF CREIGHTON... THIS STORM MAY INTENSIFY...AND A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THIS AREA. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. BUNKERS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 702 PM MDT MON AUG 1 2011 SDZ031-032-073-020145- HAAKON SD-PENNINGTON CO PLAINS SD-SOUTHERN MEADE CO PLAINS SD- 702 PM MDT MON AUG 1 2011 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PENNINGTON...EASTERN MEADE AND WESTERN HAAKON COUNTIES UNTIL 745 PM MDT... AT 700 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES NORTHEAST OF CREIGHTON...OR 31 MILES NORTHWEST OF PHILIP...MOVING EAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... AREAS NORTHWEST THROUGH NORTHEAST OF CREIGHTON... TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. BUNKERS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 827 PM MDT MON AUG 1 2011 SDZ031-042-043-020330- JACKSON SD-PENNINGTON CO PLAINS SD-SHANNON SD- 827 PM MDT MON AUG 1 2011 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PENNINGTON... SOUTHWESTERN JACKSON AND NORTHEASTERN SHANNON COUNTIES UNTIL 930 PM MDT... AT 824 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES NORTH OF ROCKYFORD...OR 40 MILES NORTH OF PINE RIDGE...MOVING EAST AT 25 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... POTATO CREEK... INTERIOR... CEDAR PASS... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. JOHNSON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 1005 PM MDT MON AUG 1 2011 SDZ032-043-046-020445- HAAKON SD-JACKSON SD-MELLETTE SD- 1005 PM MDT MON AUG 1 2011 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MELLETTE... SOUTHEASTERN HAAKON AND NORTHEASTERN JACKSON COUNTIES UNTIL 1045 PM MDT/1145 PM CDT/... AT 1001 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM BUNKER TO 5 MILES SOUTHEAST OF KADOKA...AND MOVING EAST AT 30 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... MIDLAND... BELVIDERE... THIS INCLUDES INTERSTATE 90 BETWEEN SOUTH DAKOTA MILE MARKERS 152 AND 174... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. JOHNSON
The Rapid City radar (KUDX), 110 km away, was scanning. The volume nearest the first event began at 04:06 UTC.
2 thunderstorm wind. Local standard time, as filed.
Minor damage occurred in Kadoka from winds gusts estimated around 80 mph.
Wind gusts estimated at 60 mph blew around chairs.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2011Every state in 2011This day in weather historyWarnings in South Dakota, August 2011
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: 331321, 331322.