A very narrow and persistent band of showers and isolated thunderstorms developed in the early morning hours. Rainfall rates of 1 to 3 inches per hour were common, with storm total rainfall through the lower James River valley anywhere between 2 and 6 inches.
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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.
A very narrow and persistent band of showers and isolated thunderstorms developed in the early morning hours. Rainfall rates of 1 to 3 inches per hour were common, with storm total rainfall through the lower James River valley anywhere between 2 and 6 inches.
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 Aug 3, 4:55 AM CST, 2 hours 39 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 555 AM CDT Sat Aug 3 2019 .SHORT TERM...(Today and Tonight) Issued at 407 AM CDT Sat Aug 3 2019 A band of heavy rain has developed overnight extending from Yankton county northward into Hutchinson county, with radar estimates of 2- 4 inches of rainfall around the Yankton area. With strong moisture transport into the western portion of our CWA, low level convergence, and model soundings continuing to indicate a deep warm cloud layer, any convection that develops will have the potential to produce heavy rainfall through at least mid to late morning, with the greatest threat remaining over the lower James River Valley/central MO River Valley. Hi-res CAMs have been playing catch up through most of the night, generally having QPF output too far west in comparison to reality, though all continue to point to a threat of scattered convection even into the afternoon for areas mainly west of Interstate 29. There will continue to be decent forcing through the early part of the day as the mid level shortwave continues to drift to the east, and upper level divergence is supplied by a jet max streaming from southwestern SD into eastern NE. By afternoon, forcing begins to weaken, so shower/isolated thunderstorm activity is expected to wane. Presently forecasting high temperatures in the upper 70s to lower 80s, though if cloud cover is more persistent than anticipated it will be a little cooler than that. Most models indicate drying by tonight, although some of the CAMs and the NAM would leave a threat of isolated convection lingering even into part of the overnight period. At this point, kept the forecast dry with forcing drifting away, but it may be something that will have to be updated in future forecasts. Lows tonight will again be in the 60s. .LONG TERM...(Sunday through Friday) Issued at 407 AM CDT Sat Aug 3 2019 Sunday looks to be a better day as upper level ridging in the western CONUS nudges a bit eastward. With a southeasterly low level flow taking on a more south/southwesterly direction, temperatures should warm into the mid and upper 80s. The quiet weather will be short-lived however, as a cold front dropping through the region will bring a return of thunderstorm chances on Monday. Depending on the timing of the frontal passage, convective parameters would support the threat for a few severe storms on Monday afternoon and evening. The remainder of next week looks to have temperatures at or just below normal in a northwesterly upper level flow across the region. Hard to pin down timing for convective chances, with no significant systems expected, though there could be a periodic low chance of thunderstorms through the week. && .AVIATION...(For the 12Z TAFS through 12Z Sunday morning) Issued at 551 AM CDT Sat Aug 3 2019 Showers and isolated thunderstorms will occur from the Interstate 29 and westward into the afternoon. Most of this activity is expected to remain just to the south and west of the TAF sites. MVFR ceilings will linger at KHON through mid afternoon. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...JM LONG TERM...JM AVIATION...JM
Hazardous Weather Outlook National Weather Service Sioux Falls SD 442 AM CDT Sat Aug 3 2019 NEZ013-014-SDZ038>040-050-052>071-040945- Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn- Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha- Charles Mix-Douglas-Hutchinson-Turner-Lincoln-Bon Homme-Yankton-Clay- Union- 442 AM CDT Sat Aug 3 2019 This Hazardous Weather Outlook is for northeast Nebraska, central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Scattered showers and isolated thunderstorms will be possible, mainly early today. Severe storms are not expected, though locally heavy rainfall will be possible. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Scattered thunderstorms are expected to develop across the area on Monday. A few of these storms could be severe on Monday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-040945- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock- 442 AM CDT Sat Aug 3 2019 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa and southwest Minnesota. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Scattered thunderstorms are expected to develop across the area on Monday. A few of these storms could be severe on Monday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Heavy rainfall resulted in flooded fields and ditches, as well as water across U.S. Highway 18.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2019Every state in 2019This day in weather historyWarnings in South Dakota, August 2019
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: 852088.