An isolated severe thunderstorm brought sixty mph winds to the southeast of Hayes.
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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 ABR wrote it up.
An isolated severe thunderstorm brought sixty mph winds to the southeast of Hayes.
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 Aberdeen, SD wrote its last area forecast discussion before the first event at Aug 15, 6:20 PM MST, 51 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ABERDEEN SD 820 PM CDT SAT AUG 15 2009 .UPDATE... HAVE UPDATED ZONES TO INCLUDE SEVERE THUNDERSTORM WATCH AND ADD THE MENTION OF POSSIBLE SEVERE STORMS IN THE WATCH AREA. && .PREV DISCUSSION... .SHORT TERM...TONIGHT THROUGH 12Z WEDNESDAY. MAIN FCST CHALLENGE FACING THE SHORT TERM DEALS WITH PCPN CHANCES TONIGHT...ALONG WITH THREAT OF SEVERE STORMS. 19Z MSAS ANLYS SHOWS SFC LOW JUST TO THE NE OF KMBG...WITH TRAILING COLD FRONT JUST EAST OF THE MO RIVER. AHEAD OF THIS FEATURE...TEMPS ARE NEARING 80 IN THE CLEARING WITH DWPTS IN THE MID TO UPPER 60S. FURTHER WEST...DWPTS IN THE 50S CAN BE FOUND BEHIND THE FRONT. WATER VAPOR IMAGES SHOW NEXT UPPER LEVEL WAVE EJECTING INTO THE CO/WY REGION...WITH STORMS FIRING ACROSS ERN WY/CO AND WRN NEBRASKA. AS THIS UPPER WAVE CONTS TO MOVE EASTWARD ENCOUNTERING MORE FAVORABLE CONDITIONS FOR TSRA DEVELOPMENT...EXPECT THUNDERSTORMS TO BECOME MORE NUMEROUS AS THE EVENING WEARS ON. MODELS ARE POINTING TO THE BEST DYNAMICS BEING LOCATED A BIT FURTHER SOUTH OF THE CWA...ALTHOUGH THE 4KM WRF SIMULATED RADAR REFLECTIVITY SHOWS SOME SCATTERED AIRMASS TSRA DEVELOPING ACROSS THE CENTRAL/NERN CWA LATER THIS EVENING/OVERNIGHT. SOME ISOLD TSRA HAS DEVELOPED ON BACKEDGE OF CLOUD SHIELD WHERE SOME HEATING IS HELPING TO GET MOTION STARTED. OF A LITTLE CONCEN IS FACT THAT MODELS SHOW AN AREA OF INCREASED 850HPA-700HPA Q-VECTOR CONVERGENCE SETTING UP ACROSS THE NERN CWA BY MORNING. THE GFS IS MUCH STRONGER WITH THE 700HPA THETA-E FORCING OVERNIGHT ACROSS THE EAST...WITH THE NAM FOCUSING THE ATTENTION FURTHER TO THE SOUTH. WITHOUT A WELL ESTABLISHED LOW LEVEL JET SETTING UP...HAVE OPTED TO LEAN MORE TOWARD THE NAM SOLUTION. WITH HIGH PWATS IN PLACE...EVENING SHIFT WILL NEED TO WATCH FOR LOCALIZED HEAVY RAIN AND ADJUST AS NECESSARY. HIGH PRESSURE AND DOWNGLIDE MOVES IN FOR SUNDAY...WITH COOLER AND LESS HUMID CONDITIONS. BOTH THE GFS AND NAM ADVERTISE ANOTHER WEAK WAVE ROTATING AROUND THE CLOSED 500HPA LOW...IMPACTING THE AREA LATE SUNDAY NIGHT INTO MONDAY MORNING. THERE IS SOME MINOR THETA-E FORCING WITH THIS FEATURE...BUT DONT REALLY SEE ANY RECOVERY IN THE MOISTURE FIELDS. FOR NOW THINK THAT AN INCREASE IN MID-LEVEL CLOUDINESS MAY BE ALL THAT RESULTS FROM THE NEXT WAVE. WITH DOMINATE NW FLOW AGAIN IN PLACE ACROSS THE REGION...WITH SUB ZERO 700HPA TEMPS EXPECTED FOR MONDAY AFTERNOON...DRY AND SUBSEASONAL NORMAL TEMPS MAKE A RETURN FOR THE REMAINDER OF THE NEAR TERM. .LONG TERM...TUESDAY THROUGH SUNDAY WITH BETTER MODEL AGREEMENT THAN PREVIOUS RUNS...WILL CONTINUE TO ADVERTISE PATTERN TRANSITION FROM UPPER TROUGH TO BROAD UPPER RIDGE FOR THE UPCOMING WEEKEND. WHILE MAJORITY OF PERIOD WILL BE DRY WITH A PREDOMINANT NORTHWEST FLOW...WILL SEE DECENT UPGLIDE AHEAD OF A SHORTWAVE FOR WEDNESDAY/THURSDAY. THIS FEATURE IS DECENTLY REPRESENTED IN TIMING AND INTENSITY BETWEEN GFS/GFS ENSEMBLES ALONG WITH THE ECMWF AS IT MOVES INTO THE CWA...HOWEVER THE DEPARTURE TIMING IS MORE VAGUE...WITH A SPREAD IN ENSEMBLE MEMBERS BEGINNING THURSDAY AM. WILL SEE INCREASING H85 TEMPERATURES WEDNESDAY AHEAD OF A BACKDOOR COLD FRONT...WITH A DIP BACK INTO THE UPPER SINGLE DIGITS BEHIND THE FRONT FOR THURSDAY AM. LIMITED/SLOW RECOVER ANTICIPATED AFTERWORDS...BUT A INCREASED TEMPERATURE TREND INTO SUNDAY SUGGESTS A RETURN TO NEAR CLIMO FOR THE END OF THE PERIOD. && .AVIATION... THUNDERSTORMS ARE FORMING IN CENTRAL SOUTH DAKOTA ALONG A FRONTAL BOUNDARY. THESE STORMS WILL SLOWLY MOVE ACROSS THE STATE TONIGHT AND BRING MVFR OR IFR CONDITIONS AS THE THUNDERSTORMS MOVE ACROSS. BY TOMORROW THE STORMS WILL HAVE DISSIPATED AND VFR WILL BE THE RULE FOR MUCH OF TOMORROW. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. && UPDATE...KEEFE SHORT TERM...HINTZ LONG TERM...CONNELLY AVIATION...KEEFE WEATHER.GOV/ABERDEEN
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE ABERDEEN SD 446 AM CDT SAT AUG 15 2009 MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-161000- TRAVERSE-BIG STONE-CORSON-CAMPBELL-MCPHERSON-BROWN-MARSHALL- ROBERTS-WALWORTH-EDMUNDS-DAY-DEWEY-POTTER-FAULK-SPINK-CLARK- CODINGTON-GRANT-HAMLIN-DEUEL-STANLEY-SULLY-HUGHES-HYDE-HAND-JONES- LYMAN-BUFFALO- 446 AM CDT SAT AUG 15 2009 /346 AM MDT SAT AUG 15 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL MINNESOTA...CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND NORTHEAST SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE FOR SHOWERS AND THUNDERSTORMS ACROSS THE AREA TODAY AND TONIGHT. SOME THUNDERSTORMS MAY BECOME STRONG TO SEVERE LATE THIS EVENING...WITH THE MAIN THREAT BEING LARGE HAIL AND DAMAGING WINDS. THE BEST LOCATION FOR STRONG TO SEVERE THUNDERSTORMS APPEARS TO BE ACROSS SOUTH CENTRAL SOUTH DAKOTA. LOCALLY HEAVY RAINFALL MAY BE POSSIBLE WITH SOME THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A CHANCE FOR SHOWERS AND THUNDERSTORMS WILL PERSIST DURING THE DAY ON SUNDAY...MAINLY ACROSS THE EASTERN AREAS. SEVERE STORMS ARE NOT ANTICIPATED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. SD
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 826 PM CDT SAT AUG 15 2009 SDZ033-045-160215- JONES-STANLEY- 826 PM CDT SAT AUG 15 2009 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR JONES AND SOUTHWESTERN STANLEY COUNTIES UNTIL 915 PM CDT/815 PM MDT/... AT 726 PM MDT/826 PM CDT/...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 11 MILES NORTHEAST OF KADOKA TO 7 MILES SOUTH OF OKATON TO 26 MILES SOUTH OF WHITE RIVER...MOVING NORTHEAST AT 40 MPH. A FEW LOCATIONS IN THE ADVISORY INCLUDE OKATON...WESTOVER...MURDO... CAPA...DRAPER...BUNKER AND VAN METRE. PENNY TO NICKEL SIZE HAIL...AND WINDS AROUND 40 TO 50 MPH ARE EXPECTED WITH THESE STORMS. PRECAUTIONARY/PREPAREDNESS ACTIONS... LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT SUNDAY MORNING/MIDNIGHT MDT SUNDAY MORNING/ FOR CENTRAL SOUTH DAKOTA. && KRAMLICH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 847 PM CDT SAT AUG 15 2009 SDZ033-035-045-048-160215- HUGHES-JONES-LYMAN-STANLEY- 847 PM CDT SAT AUG 15 2009 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR CENTRAL HUGHES...NORTHEASTERN JONES...NORTHWESTERN LYMAN AND SOUTHEASTERN STANLEY COUNTIES UNTIL 915 PM CDT/815 PM MDT/... AT 845 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 8 MILES SOUTHWEST OF ROSSEAU...OR 10 MILES SOUTHEAST OF PIERRE...MOVING NORTHEAST AT 15 MPH. A FEW LOCATIONS IN THE ADVISORY INCLUDE ROSSEAU AND CANNING. SMALL HAIL...AND WINDS AROUND 40 TO 50 MPH ARE EXPECTED WITH THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT SUNDAY MORNING/MIDNIGHT MDT SUNDAY MORNING/ FOR CENTRAL SOUTH DAKOTA. && KRAMLICH
The Rapid City radar (KUDX), 153 km away, was scanning. The volume nearest the first event began at 02:10 UTC.
1 thunderstorm wind. Local standard time, as filed.
A spotter reported sixty mph winds southeast of Hayes.
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: 194347.