River levels already high from excessive rains during late June and early July received another push upward from heavy rainfall on July 18-19. Rainfall from 3 to 9 inches was common across Brookings County.
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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.
River levels already high from excessive rains during late June and early July received another push upward from heavy rainfall on July 18-19. Rainfall from 3 to 9 inches was common across Brookings County.
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 Jul 19, 5:37 PM CST, 1 hour 23 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Sioux Falls SD 437 AM CDT Thu Jul 19 2018 NEZ013-014-SDZ038-050-052-053-057>060-063>066-068>071-200945- Dixon-Dakota-Beadle-Gregory-Jerauld-Sanborn-Brule-Aurora-Davison- Hanson-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton- Clay SD-Union- 437 AM CDT Thu Jul 19 2018 This Hazardous Weather Outlook is for portions of northeast Nebraska, central South Dakota, east central South Dakota, south central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Friday through Wednesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-SDZ039-040-054>056-061-062-067-200945- 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-Kingsbury-Brookings-Miner-Lake- Moody-McCook-Minnehaha-Lincoln SD- 437 AM CDT Thu Jul 19 2018 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, southwest Minnesota, east central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Scattered to numerous showers and thunderstorms are expected today through this evening. Locally heavy rainfall will be the main threat, however an isolated strong storm with small hail and gusty winds to 50 mph will be possible this afternoon in northwest Iowa and southwest Minnesota. .DAYS TWO THROUGH SEVEN...Friday through Wednesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is unlikely today and tonight.
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</html>The national radar mosaic for the moment the first event began.
4 flood. Local standard time, as filed.
Significant amounts of crop and pasture land near Medary Creek were severely impacted by moderate flooding as river levels climbed to 2.5 feet above flood stage near Medary (gage site MDYS2) on July 20.
Significant amounts of crop and pasture land near the Big Sioux River, along with numerous county and township roads were severely impacted by moderate flooding as river levels climbed to 2.5 feet above flood stage near Brookings (gage site BRKS2) on July 21.
Significant amounts of crop and pasture land were impacted by minor flooding as river levels climbed to 1.2 feet above flood stage near Interstate 90 at Sioux Falls (gage site SFLS2) on July 25.
Significant amounts of crop and pasture land were impacted by minor flooding as river levels climbed to 0.1 foot above flood stage near Dell Rapids (gage site DERS2) on July 25.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2018Every state in 2018This day in weather historyWarnings in South Dakota, July 2018
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 2026-10-01. Each event’s entry at NCEI: 772857, 772860, 772865, 772861.