High releases from Angostura Reservoir, combined with runoff from heavy rain, caused flooding along the Cheyenne River upstream from Lake Oahe.
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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.
High releases from Angostura Reservoir, combined with runoff from heavy rain, caused flooding along the Cheyenne River upstream from Lake Oahe.
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 Jun 9, 4:10 PM MST, 50 minutes earlier.
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 510 PM MDT TUE JUN 9 2015 .SHORT TERM...THIS EVENING THROUGH WEDNESDAY NIGHT ISSUED AT 216 PM MDT TUE JUN 9 2015 BROAD UPPER RIDGING COVERS THE WESTERN 2/3 OF THE STATES...WITH A WEAK LOW OVER THE GREAT BASIN REGION AND A STRONGER LOW OFF THE COAST OF CALIFORNIA. SKIES ACROSS THE NORTHERN PLAINS ARE CLEAR EXCEPT FOR A FEW CUMULUS AND A WEAK SHOWER THAT POPPED UP OVER THE HILLS. SURFACE LOW IS OVER THE ND/MN BORDER...WITH COLD FRONT MOVING THROUGH NORTHWEST SD. AHEAD OF THE FRONT...WINDS ARE LIGHT AND TEMPS ARE RISING INTO THE 80S AND 90S...WARMEST ACROSS CENTRAL SD. UPPER RIDGE BREAKS DOWN TONIGHT AS LOW MOVES ONSHORE AND A COUPLE WAVES PUSH INTO THE NORTHERN PLAINS. FIRST WEAK WAVE APPROACHES FROM THE NORTHWEST TONIGHT...BRINGING SHOWERS AND THUNDERSTORMS TO NORTHEAST WYOMING AND THE BLACK HILLS...THEN EXPANDING INTO WESTERN SD...MAINLY THE NORTHWEST. EASTERLY WINDS TONIGHT WILL AID IN MOISTURE ADVECTION. LOWS WILL BE AROUND 60. A STRONGER WAVE WILL MOVE INTO THE REGION WEDNESDAY...BRINGING WIDESPREAD SHOWERS AND THUNDERSTORMS. EXPECT THE MAJORITY OF THUNDERSTORMS TO REMAIN ACROSS THE SOUTHWESTERN PORTION OF THE CWA WHERE THERE IS ABOUT 2500 J/KG MLCAPE. 0-6KM SHEAR THERE IS 25-30 KTS...SO THERE MAY BE A FEW STRONG TO SEVERE STORMS THAT DEVELOP...BUT OVERALL BELIEVE THE MAIN THREAT WILL BE HEAVY RAIN AND FLOODING POTENTIAL WEDNESDAY NIGHT. LOW-LEVEL JET INCREASES AS UPPER LOW CLOSES OFF OVER SOUTHWEST SD...BRINGING MORE MOISTURE INTO THE AREA. PWAT VALUES ARE 1-1.5 INCHES OVERNIGHT...HIGHEST ACROSS SOUTHWEST INTO CENTRAL SD...AND STORM MOTION IS WEAK. 1 TO 2 INCHES OF RAIN ARE POSSIBLE WEDNESDAY INTO THURSDAY. CONSIDERING ALREADY SATURATED GROUND...COLLABORATED WITH SURROUNDING OFFICES ABOUT POTENTIAL FLASH FLOOD WATCH. DUE TO UNCERTAINTIES IN LOCATION OF HIGHEST PRECIP AMOUNTS AT THIS POINT...THE CONSENSUS WAS TO HOLD OFF ON THE WATCH FOR NOW...BUT THIS WILL DEFINITELY NEED TO BE CONSIDERED IN THE NEAR FUTURE. HIGHS WEDNESDAY WILL RANGE FROM THE LOWER 70S ACROSS NORTHWEST SD TO THE LOWER 80S ACROSS NORTHEAST WY AND SOUTHERN SD. .LONG TERM...THURSDAY THROUGH TUESDAY ISSUED AT 216 PM MDT TUE JUN 9 2015 PCPN WILL CONTINUE INTO THURSDAY MORNING...BEFORE DIMINISHING THURSDAY AFTERNOON/NIGHT AS HIGH PRESSURE BUILDS INTO THE DAKOTAS. GENERALLY DRY WX THEN EXPECTED THROUGH FRIDAY. UNSETTLED CONDITIONS THEN RETURN FOR THE WEEKEND INTO EARLY NEXT WEEK AS SW FLOW ALOFT INCREASES WITH NEXT APPROACHING TROF. COOL CONDITIONS EXPECTED THURSDAY...WITH TEMPS SLOWLY WARMING THROUGH EARLY NEXT WEEK. && .AVIATION...(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING) ISSUED AT 509 PM MDT TUE JUN 9 2015 ISOLATED TSTM OVER THE BLKHLS THIS EVENING COULD BRING LOCAL MVFR CONDITIONS. A BETTER CHANCE OF SHRA/TSTMS WILL OCCUR LATE TONIGHT INTO WED MRNG MAINLY FROM NERN WY INTO NWRN SD. WHILE MOST CIGS WITH THIS PCPN WILL BE VFR...SOME LOCALIZED MVFR/IFR VSBYS EXPECTED. OUTSIDE OF ANY PCPN...VFR CONDITIONS EXPECTED THROUGH WED MRNG. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...NONE. WY...NONE. && SHORT TERM...POJORLIE LONG TERM...JOHNSON AVIATION...JC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 343 AM MDT TUE JUN 9 2015 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-101300- HARDING-PERKINS-BUTTE-NORTHERN MEADE CO PLAINS-ZIEBACH- NORTHERN BLACK HILLS-NORTHERN FOOT HILLS-RAPID CITY- SOUTHERN FOOT HILLS-CENTRAL BLACK HILLS-SOUTHERN BLACK HILLS- CUSTER CO PLAINS-PENNINGTON CO PLAINS-HAAKON-FALL RIVER-SHANNON- JACKSON-BENNETT-MELLETTE-TODD-TRIPP-STURGIS/PIEDMONT FOOT HILLS- SOUTHERN MEADE CO PLAINS-HERMOSA FOOT HILLS-NORTHERN CAMPBELL- SOUTHERN CAMPBELL-WESTERN CROOK-WYOMING BLACK HILLS-WESTON- NORTHEASTERN CROOK- 343 AM MDT TUE JUN 9 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED STORMS ARE POSSIBLE ACROSS THE BLACK HILLS THIS AFTERNOON. THUNDERSTORMS WILL BE POSSIBLE ACROSS NORTHEAST WYOMING AND FAR WESTERN SOUTH DAKOTA TONIGHT. SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. HIGH STREAM FLOWS WITH SOME MINOR FLOODING WILL CONTINUE ON SOME CREEKS AND STREAMS IN THE BLACK HILLS AND THE ADJACENT PLAINS. ANY ADDITIONAL RAINFALL TODAY AND TONIGHT MAY AGGRAVATE FLOODING CONDITIONS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS WILL BE LIKELY ACROSS THE AREA WEDNESDAY AND THURSDAY. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHWEST SOUTH DAKOTA WEDNESDAY...WITH LARGE HAIL AND DAMAGING WINDS AS THE MAIN THREATS. FLOODING CONDITIONS WILL CONTINUE ACROSS PORTIONS OF THE WESTERN SOUTH DAKOTA THE NEXT FEW DAYS. ANY ADDITIONAL RAINFALL THROUGH THE WEEK MAY AGGRAVATE FLOODING CONDITIONS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES... OR CHECK OUR WEB SITE AT WEATHER.GOV/RAPIDCITY
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
430 PM MDT TUE JUN 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0415 PM HAIL 2 NE SHERIDAN LAKE 43.98N 103.44W
06/09/2015 E1.00 INCH PENNINGTON SD PUBLIC
PING REPORT
&&
JCPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
431 PM MDT TUE JUN 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0328 PM HAIL 4 NE ROCKERVILLE 44.00N 103.31W
06/09/2015 M1.25 INCH PENNINGTON SD NWS EMPLOYEE
&&
JCPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
433 PM MDT TUE JUN 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0325 PM HAIL 4 NE ROCKERVILLE 44.00N 103.30W
06/09/2015 M1.00 INCH PENNINGTON SD NWS EMPLOYEE
&&
MEPRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE RAPID CITY SD
519 PM MDT TUE JUN 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0415 PM HAIL 2 NE SHERIDAN LAKE 43.98N 103.44W
06/09/2015 E1.00 INCH PENNINGTON SD PUBLIC
SHAVE REPORT
&&
CORRECTED REMARKS
JCSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 534 PM MDT TUE JUN 9 2015 SDZ028-100000- CENTRAL BLACK HILLS SD- 534 PM MDT TUE JUN 9 2015 ...STRONG THUNDERSTORM OVER CENTRAL PENNINGTON COUNTY... AT 533 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR SHERIDAN LAKE...OR 8 MILES NORTHEAST OF HILL CITY...MOVING EAST AT 10 MPH. NICKEL SIZE HAIL WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... ROCKERVILLE AND SHERIDAN LAKE. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 4398 10349 4403 10348 4402 10334 4395 10335 TIME...MOT...LOC 2333Z 288DEG 8KT 4400 10342 JC
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 543 PM MDT TUE JUN 9 2015 SDZ029-074-100000- HERMOSA FOOT HILLS SD-SOUTHERN BLACK HILLS SD- 543 PM MDT TUE JUN 9 2015 ...STRONG THUNDERSTORM OVER CENTRAL CUSTER COUNTY... AT 543 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER SOUTHEASTERN CUSTER STATE PARK...OR 10 MILES SOUTHEAST OF CUSTER... MOVING SOUTHEAST AT 10 MPH. NICKEL SIZE HAIL WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... NORTHEASTERN WIND CAVE NATIONAL PARK AND SOUTHEASTERN CUSTER STATE PARK. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 4367 10350 4373 10340 4368 10324 4356 10341 TIME...MOT...LOC 2343Z 312DEG 8KT 4367 10343 JC
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Minor to moderate flooding of agricultural land occurred along the Cheyenne River.
Minor to moderate flooding of agricultural land occurred along the Cheyenne River.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2015Every state in 2015This day in weather historyWarnings in South Dakota, June 2015
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: 588399, 588402.