Thunderstorms caused flash flooding of streets in Vermillion in Clay County of southeast South Dakota before daybreak on the morning of September 7th.
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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 FSD wrote it up.
Thunderstorms caused flash flooding of streets in Vermillion in Clay County of southeast South Dakota before daybreak on the morning of September 7th.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Sep 7, 2:06 AM CST, 9 minutes earlier.
Area Forecast Discussion National Weather Service Sioux Falls SD 306 AM CDT WED SEP 7 2016 .SHORT TERM...(Today and Tonight) Issued at 305 AM CDT Wed Sep 7 2016 Upper level energy to the northwest of the area was keeping the surface to about 850mb front from moving south too far, even with widespread convection across northeast Nebraska and northwest Iowa. Expect this thunderstorm activity to diminish and shift southeast through the early morning as the low level jet veers to the west southwest and convergence weakens. Already starting to see some signs of this as convection making a bit of a surge to the southeast at 730z, whereas from about 5z to 7z the activity gradually built north. Radar estimates of 2-3" of rain from just southeast of Yankton to just north of Vermillion to Hawarden, all of which fell from about 530z-730z. Today will likely prove to be a fairly cloudy and dreary day with spotty shower and thunderstorm activity. At this time the thunderstorms are not expected to be as intense as that occurring early this morning, but a few storms could produce briefly heavy rainfall. The main crux of the upper level support will swing through by evening but the drier air aloft will not make it through until later tonight. this will keep a chance for showers and thunderstorms in areas east of the James River through the evening. Temperatures will not rise much today with the expected widespread cloud cover so only aiming for mid to upper 70s. Lows tonight should cool off a bit as winds weaken and clouds diminish. Fog might be an issue but will not tackle that until confidence that winds will be light enough on Thursday morning. Lows should be in the middle to upper 50s. .LONG TERM...(Thursday through Tuesday) Issued at 305 AM CDT Wed Sep 7 2016 Thursday will be dry and mild with light winds, transitioning from northwesterly to southerly as the surface ridge passes. After a generally clear/sunny start, clouds will slowly increase ahead of an approaching Rockies wave. Ahead of this wave Thursday night, increasing instability, moisture advection, and favorable thermal advection will give rise to scattered storms, even though these parameters will spread in still ahead of the upper support. The SPC introduction of a marginal severe risk on the new day 2 outlook is no surprise, with MUCAPE of up to 2000 j/kg intruding into the area,especially south of Interstate 90. Friday should see the convection at the start of the day, then steadily decreasing from the west as the wave approaches and passes, and the favorable parameters wane. The precipitation should generally end by early evening. Cooler air will start to arrive with highs 70 to 75. The weekend looks dry with a cool start, then warming on Sunday. Feel Saturday could be a bit breezy, though have tamely raised the low looking guidance winds only a notch or two for now. Overall, the weekend looks like a great end of summer time for outdoor activities. Monday and Tuesday will bring another wave, a chance of showers or tame storms, and likely a cooling trend. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) Issued at 1033 PM CDT Tue Sep 6 2016 Unsettled weather will continue through much of the TAF period with periodic shower and thunderstorm chances into late Wednesday afternoon. MVFR ceilings will be present across much of the area overnight into Wednesday morning, with some improvement by afternoon. && .FSD Watches/Warnings/Advisories... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...08 LONG TERM... AVIATION...JM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 758 PM CDT TUE SEP 6 2016 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-080100- LYON IA-OSCEOLA-DICKINSON-SIOUX-O'BRIEN-CLAY IA-PLYMOUTH-CHEROKEE- BUENA VISTA-WOODBURY-IDA-LINCOLN MN-LYON MN-MURRAY-COTTONWOOD- NOBLES-JACKSON-PIPESTONE-ROCK-DIXON-DAKOTA-BEADLE-KINGSBURY- BROOKINGS-GREGORY-JERAULD-SANBORN-MINER-LAKE-MOODY-BRULE-AURORA- DAVISON-HANSON-MCCOOK-MINNEHAHA-CHARLES MIX-DOUGLAS-HUTCHINSON- TURNER-LINCOLN SD-BON HOMME-YANKTON-CLAY SD-UNION- 758 PM CDT TUE SEP 6 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST IOWA...WEST CENTRAL IOWA...SOUTHWEST MINNESOTA...NORTHEAST NEBRASKA...CENTRAL SOUTH DAKOTA...EAST CENTRAL SOUTH DAKOTA... SOUTH CENTRAL SOUTH DAKOTA AND SOUTHEAST SOUTH DAKOTA. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS MAY DEVELOP AND LIFT ACROSS THE OUTLOOK AREA OVERNIGHT. SEVERE WEATHER IS NOT EXPECTED WITH THIS ACTIVITY. IN PORTIONS OF NORTHWEST IOWA AND EXTREME SOUTHEAST SOUTH DAKOTA...LOCALLY HEAVY RAINFALL COULD BE POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SCATTERED THUNDERSTORMS ARE POSSIBLE WEDNESDAY...AND AGAIN THURSDAY NIGHT. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The Sioux Falls radar (KFSD), 92 km away, was scanning. The volume nearest the first event began at 08:16 UTC.
1 flash flood. Local standard time, as filed.
Thunderstorms produced heavy rain, which caused flash flooding of several streets, especially at some intersections.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2016Every state in 2016This day in weather historyWarnings in South Dakota, September 2016
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: 657848.