Rainfall from 2 to 3 inches fell across middle portions of the Big Sioux River Basin between August 15 and August 18.
Every event with a place to put it. Tap one for its entry below.
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.
Rainfall from 2 to 3 inches fell across middle portions of the Big Sioux River Basin between August 15 and August 18.
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 18, 9:27 PM CST, 33 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1027 PM CDT Sun Aug 18 2019 .SHORT TERM...(This Evening through Monday) Issued at 349 PM CDT Sun Aug 18 2019 A very nice day has prevailed across the region with light north winds and temperatures ranging from the upper 60s to upper 70s. This nice weather is brought to you thanks to the surface high pressure, currently centered over eastern SD. Winds will begin to transition to the south this evening into the overnight hours, as the high moves southeast. A quiet and chilly night is expected with mostly clear skies and light winds. Conditions will be favorable for efficient radiational cooling, thus areas of fog could be possible, mainly east of I-29 by early Monday morning. Overnight lows will range from the lower 50s to lower 60s. Conditions will change to start the work week with the return of heat and humidity. As the surface high moves east out of the region, a broad area of warm air advection surges northward into the region. Precipitation is not anticipated throughout the day, but breezy south winds from 15 to 25 mph will be possible in the afternoon. Highs will generally be in the 80s to near 90 along the Missouri River. .LONG TERM...(Monday Night through Sunday) Issued at 349 PM CDT Sun Aug 18 2019 A broad area of theta-e advection moves into the region Monday night into Tuesday, ahead of a weak upper shortwave. With decent instability, showers and storms will be possible during this time- frame. This activity should be hit and miss with no severe weather expected. Upper ridge will be centered over the Four Points/Southern Plains. Warm and humid conditions continue on Tuesday with highs slightly warmer than Monday. Highs from the upper 80s to lower 90. Thunderstorm chances increase across the Central Plains, ahead of an upper trough moving north into NE/IA. At this time, most of the precipitation looks possible along and south of the Missouri River Valley into Highway 20. The main story Wednesday and beyond is cooler than average temperatures. Canadian high pressure slides southeast on Wednesday, bringing drier and cooler air through the end of the week. The next chance of precipitation arrives Thursday night through Friday night as a warm front lifts north into the region. Details at this point are uncertain. The GFS remains mostly dry while the ECMWF brings most of the precipitation across the region through Friday night. As for now, have kept PoPs as guidance suggests with a slight chance of precipitation through Saturday. && .AVIATION...(For the 06Z TAFS through 06Z Monday night) Issued at 1026 PM CDT Sun Aug 18 2019 Primarily VFR conditions through the TAF period. However, there could be some patchy fog development possible early Monday morning, with the greater risk at KSUX. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...05 LONG TERM...05 AVIATION...JM
Hazardous Weather Outlook National Weather Service Sioux Falls SD 714 PM CDT Sun Aug 18 2019 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-200015- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-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-Bon Homme-Yankton- Union- 714 PM CDT Sun Aug 18 2019 This Hazardous Weather Outlook is for 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. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. An isolated thunderstorm is possible late Monday night into Tuesday. The risks of a severe storm is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
707 PM CDT SUN AUG 18 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1041 PM TORNADO 1 SE ROCK RAPIDS 43.42N 96.15W
08/17/2019 LYON IA NWS STORM SURVEY
TIME ESTIMATED BASED ON RADAR. ADDITIONAL
DETAIL FROM STORM SURVEY WILL BE COMPLIED
MONDAY, 8-19-2019.
&&The national radar mosaic for the moment the first event began.
4 flood. Local standard time, as filed.
The Big Sioux River near Brookings (gage site BRKS2) crested at 0.21 feet above flood stage. Significant amounts of agricultural land remained flooded.
The Big Sioux River near Estelline (gage site BSES2) crested at 0.28 feet above flood stage on August 20. Significant amounts of agricultural land were flooded.
The Big Sioux River near Bruce (gage site BRCS2) crested 0.24 feet above flood stage with flooding of agricultural land.
The Big Sioux River at Sioux Falls I-90 (gage site SFLS2) crested at 0.09 feet above flood stage on August 22. Significant amounts of agricultural land were flooded north of Sioux Falls.
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: 849623, 849621, 849622, 849624.