Training thunderstorms brought very heavy rains of 5 to 10 inches to southeast Hand county resulting in flash flooding. Many area roads and crops were flooded for several hours from the late evening and into the morning hours.
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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.
Training thunderstorms brought very heavy rains of 5 to 10 inches to southeast Hand county resulting in flash flooding. Many area roads and crops were flooded for several hours from the late evening and into the morning hours.
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 Jul 29, 8:52 PM CST, 5 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ABERDEEN SD 952 PM CDT THU JUL 29 2010 .UPDATE... LLJ SHRAS/TSRAS WILL CONTINUE TO DEVELOP AND LIFT NORTHEAST THROUGH THE NIGHT AFFECTING MAINLY CENTRAL SD THROUGH NORTHEAST SD AND WEST CENTRAL MN. HEAVY RAIN ALONG WITH SOME FLOODING IS POSSIBLE. ALREADY HAD REPORTS OF 2 TO 4 INCHES IN SOUTHEAST HAND COUNTY THIS EVENING. NORTH CENTRAL SD WILL PROBABLY ESCAPE MOST OF THE RAINFALL. UPDATED FORECAST. && .PREV DISCUSSION... .SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT A COMPLEX WEATHER PATTERN IS EXPECTED OVER THE NEXT 12 TO 18 HOURS. AS OF 19Z...LIGHT SHOWERS AND A FEW THUNDERSTORMS CONTINUE TO REDEVELOP WITHIN A NARROW RIBBON OF INSTABILITY. THE INSTABILITY AXIS RUNS FROM NW SD...SE TOWARDS NE NEBRASKA. ONCE CONVECTION MOVES EAST...AWAY FROM THE BEST INSTABILITY...THEY BEGIN TO WEAKEN TO MOSTLY LIGHT SHOWERS. WHILE THE LATEST DAY ONE OUTLOOK FROM SPC DOES HAVE A LARGE PORTION OF SOUTH DAKOTA UNDER A SLIGHT RISK...BELIEVE THE ATMOSPHERE WILL REMAIN FAIRLY STABLE FROM EAST OF HIGHWAY 83...AND NORTH OF HIGHWAY 14. SKIES ARE BEGINNING TO CLEAR WEST OF HIGHWAY 83...WHICH SHOULD ALLOW FOR THE LOW LEVEL LAPSE RATES TO STEEPEN. HOWEVER...GIVEN THE AMOUNT OF MID LEVEL MOISTURE...IT REMAINS UNCLEAR IF SEVERE STORMS WILL BE ABLE TO DEVELOP LATER THIS AFTERNOON OVER THE WESTERN DAKOTAS. THE 18Z GOES SOUNDER DPI TOTAL PWATS DOES SHOW MOISTURE WRAPPING CLOCKWISE AROUND A MID/UPPER LEVEL HIGH WHICH IS SITUATED OVER EAST TEXAS. THE HIGHEST PWATS...ACCORDING THE GOES SOUNDER IS LOCATED OVER THE EASTERN DAKOTAS AND POINTS SW TOWARDS THE FOUR CORNERS REGION. BECAUSE OF THE POOR SEVERE WEATHER ENVIRONMENT...HAVE TRIMMED BACK ON THE SEVERE WORDING IN THE GRIDS TO LOCATIONS ALONG AND WEST OF THE MISSOURI RIVER. WHILE THE SEVERE THREAT IS NOT ALL THAT GOOD...THE POTENTIAL FOR LOCALLY HEAVY RAINFALL STILL LOOKS POSSIBLE. PWATS REMAIN PRETTY HIGH DURING THE OVERNIGHT HOURS...AND WHEN COMBINED WITH A SLOW STORM MOTION...AROUND 10 KNOTS SHOULD RESULT IN HEAVY RAIN. WILL FOR GO ISSUING A FLASH FLOOD WATCH DO TO THE BELIEF THAT THE HEAVIEST PCPN BAND WILL FORM A BIT SOUTH OF THE CWA. BEHIND THIS STORM SYSTEM...THE OVERALL FLOW PATTERN BECOMES NORTHWEST ORIENTATED...WITH H7-H5 RH VALUES FALLING BELOW 35 PERCENT. THERE WILL BE SOME LEFT OVER MOISTURE AND INSTABILITY IN THE EASTERN DAKOTAS THAT CONVECTION MAY DEVELOP DURING THE AFTERNOON HOURS ON FRIDAY. THE NEXT CHANCE FOR SHOWERS AND THUNDERSTORMS WILL BE SATURDAY NIGHT...MAINLY FOR LOCATIONS ALONG THE ND/SD BORDER. AN AREA OF LOW PRESSURE WILL BE SITUATED OVER EASTERN MONTANA...WITH A DECENT LLJ AHEAD OF THE LOW. THE MAIN QUESTION WILL BE THE STRENGTH OF THE CAP. .LONG TERM...SUNDAY THROUGH WEDNESDAY GLOBAL NUMERICAL MODEL SOLUTIONS IN GOOD AGREEMENT ON SUNDAY IN REGARD TO A SHORT- WAVE TROUGH SKIRTING EASTWARD ALONG THE MT-CANADIAN BORDER. WARM FRONTAL POSITION CONTINUES TO BE TOO FAR NORTH COMPARED TO PREVIOUS SYSTEMS AND WIDESPREAD CONVECTIVE COVERAGE WILL REMAIN IN ND. MADE LITTLE CHANGE TO POPS SUNDAY WHICH FOCUSES THE BEST THUNDERSTORM CHANCES OVER THE NORTHERN CWA. ASSOCIATED COLD FRONT PROGGED TO TRACK ACROSS THE REGION SUNDAY INTO SUNDAY NIGHT. EST CHANCES FOR PRECIP/THUNDERSTORMS MAY BE WHEN THE LOW LEVEL JET GETS GOING (APPROX. 40-45KTS) SUNDAY EVENING ACROSS THE EASTERN THIRD OF THE CWA. LATEST GFS...HOWVER...HAS +14-15C AT 700 MB...WHICH WOULD GREATLY INHIBIT THUNDERSTORM POSSIBILITIES. NAM NOT QUITE AS WARM BUT TRENDING SOMEWHAT WARMER. WILL HAVE TO KEEP A CLOSE EYE ON THIS MID-LEVEL WARM TONGUE...AND LOWER PRECIP CHANCES IF THE MODELS CONTINUE TO REMAIN SO WARM AT H7. SHORT- WAVE TROUGH MOVES EASTWARD ALONG THE ND-CANADIAN BORDER...AND EAST OF THE REGION BY MID-DAY MONDAY. KEPT MAINLY DRY CONDITIONS MOST AREAS MONDAY AND MONDAY NIGHT AS A RESULT. SURFACE HIGH SHIFTS EAST OF THE AREA LATE MONDAY NIGHT WITH THE SOUTHEAST SURFACE AND NEAR SURFACE FLOW RETURNING DEEP GULF MOISTURE THE THE CWA FOR LATE-DAY TUESDAY. && .AVIATION... TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS VFR/MVFR CEILINGS ARE EXPECTED TO AFFECT ALL TAF LOCATIONS TONIGHT. OTHERWISE...SHRAS/TSRAS SHOULD AFFECT ABR AND ATY THROUGH THE NIGHT IN THE VICINITY OR AT THE STATION. ATY HAS THE BEST CHANCE OF BEING AFFECTED. WILL WATCH DEVELOPMENT ON RADAR AND AMEND IF NECESSARY. OTHERWISE...THE CLOUDS WILL BREAK UP ON FRIDAY WITH VFR CONDITIONS THROUGH THE DAY. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. && UPDATE...MOHR SHORT TERM...SD LONG TERM...CHURCH AVIATION...MOHR WEATHER.GOV/ABERDEEN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ABERDEEN SD 517 AM CDT THU JUL 29 2010 MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-301030- 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- 517 AM CDT THU JUL 29 2010 /417 AM MDT THU JUL 29 2010/ 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 SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE REGION TODAY AND TONIGHT. A FEW OF THOSE STORMS COULD BE SEVERE WITH HAIL AND STRONG WINDS. ALSO...LOCALLY HEAVY RAIN WILL BE POSSIBLE. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE THROUGHOUT THE PERIOD...ESPECIALLY IN THE EVENING AND OVERNIGHT HOURS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY OR TONIGHT...ESPECIALLY OVER CENTRAL SOUTH DAKOTA. TDK
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
918 PM CDT THU JUL 29 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0845 PM HEAVY RAIN 4 E DANFORTH 44.25N 98.80W
07/29/2010 E2.00 INCH HAND SD PUBLIC
OVER 2 INCHES OF RAIN, DITCHES FULL
&&
NWSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
937 PM CDT THU JUL 29 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0930 PM HEAVY RAIN 3 ENE DANFORTH 44.27N 98.83W
07/29/2010 E4.00 INCH HAND SD EMERGENCY MNGR
2-4 INCHES HAS FALLEN IN THE AREA SINCE THIS AFTERNOON.
&&
NWSThe Aberdeen radar (KABR), 137 km away, was scanning. The volume nearest the first event began at 02:56 UTC.
1 flash flood. Local standard time, as filed.
Many roads were flooded by very heavy rains of 5 to 10 inches in southeast Hand county including Highway 45.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2010Every state in 2010This day in weather historyWarnings in South Dakota, July 2010
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: 250780.