A gradual decrease in river levels occurred as water was routed downstream along the Little Sioux River.
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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 gradual decrease in river levels occurred as water was routed downstream along the Little Sioux River.
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 May 31, 10:45 PM CST, 1 hour 15 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1145 PM CDT Fri May 31 2019 .SHORT TERM...(This Evening through Saturday) Issued at 317 PM CDT Fri May 31 2019 Generally pleasant conditions have prevailed today, despite the smoke layer from wildfires in Canada. The smoke layer has not been thick enough to impact temperatures significantly; therefore have increased afternoon temperatures a few degrees. Afternoon satellite imagery shows a cold front dropping south over North Dakota, and an upper low swinging over western Dakota. The upper low and surface boundary will be moving east/south across the FA tonight. This will lead to increasing chances for scattered showers and thunderstorms across the region this evening into early Saturday. Daytime heating, MUCAPE from 1000-2000 J/kg and steep 0- 3km lapse rates persisting late this afternoon and evening could lead to a favorable environment for isolated strong to marginally severe storms. The 0-6km shear is meager (around 20kts) but soundings continue to suggest an inverted-V profile with DCAPE values approaching 1000 J/kg, which could support strong gusty winds. This is mainly in areas along and north of Highway 14 across east-central SD and areas along and west of I-29. Isolated marginally hail cannot be ruled out in some of the stronger updrafts, but the main risk is damaging winds. The threat for isolated strong to marginally severe storms is mainly from 0000-0700 UTC (7PM-2AM); however showers and a few elevated storms will persist through early Saturday morning. Surface cold front slides southward into central NE/IA early Saturday morning. Some spotty rain could be possible in our far eastern Counties in northwest Iowa through daybreak. Behind the front, northwest flow aloft and surface high pressure settles in, bringing pleasant and drier conditions on Saturday. With northwest flow prevailing, temperatures will be a bit cooler than previous days. 850 hPa temperatures drop into the 8-11+ C range; this is near to slightly below normal for June standards. Highs will mainly range in the low 70s. .LONG TERM...(Saturday Night through Friday) Issued at 317 PM CDT Fri May 31 2019 The main features on the extended are an upward trend in temperatures and precipitation chances. Pleasant conditions continue on Sunday, with mostly sunny skies and light winds. Temperatures will be a bit tricky, depending on how long and thick the smoke from Canadian wildfires are, and hence, the mixing in the boundary layer. At the moment, have highs in the low to mid 70s. The GFS and ECMWF bring some impulses of energy over the region Sunday night, leading to some spotty storms. Have included a slight chance of precipitation along the MO River Valley. Northwest to westerly flow aloft will dominate the region after Monday as a strong upper ridge builds in over the plains. This will bring warmer conditions along with different vort max/shortwaves across the area. Daytime highs will mainly be in the 80s throughout the week. The next chance of precipitation arrives late Monday into Tuesday as as increasing warm air advection and a surface low move east over the area. Surface high pressure keeps the area relatively dry Wednesday into the end of the week, though zonal flow aloft will favor some spotty thunderstorms mainly in the afternoon and evening throughout the week. && .AVIATION...(For the 06Z TAFS through 06Z Saturday night) Issued at 1141 PM CDT Fri May 31 2019 VFR conditions are expected through the TAF period. A band of light to moderate rain from elevated showers will continue to track east through the area, mainly impacting I-29 and east overnight. A few isolated embedded thunderstorms will also be possible. Have added shra to FSD but ceilings are expected to remain VFR. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...05 LONG TERM...05 AVIATION...
Hazardous Weather Outlook National Weather Service Sioux Falls SD 952 PM CDT Fri May 31 2019 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-020300- 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- 952 PM CDT Fri May 31 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. Scattered thunderstorms are expected across the region tonight, but they are not expected to be severe. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
10 flood. Local standard time, as filed.
A continuation of flooding from May, the Ocheyedan River near Spencer (gage site SPOI4) began the month at 2.12 feet above flood stage. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River near Montgomery (gage site MLSI4) began the month at 0.62 feet above flood stage. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River near Milford (gage site MIFI4) began the month at 3.99 feet above flood stage. Water inundated 180th Street between 170th and 190th Avenues as well as 190th Avenue near 240th Street. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River near Milford (gage site MIFI4) began the month at 3.99 feet above flood stage. Water inundated 180th Street between 170th and 190th Avenues as well as 190th Avenue near 240th Street. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River at Spencer (gage site SPWI4) began the month at 3.76 feet above flood stage. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River at Linn Grove (gage site LNNI4) began the month at 1.50 feet above flood stage. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River at Linn Grove (gage site LNNI4) began the month at 1.50 feet above flood stage. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River at Linn Grove (gage site LNNI4) began the month at 1.50 feet above flood stage. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River at Cherokee (gage site CHKI4) began the month at 3.70 feet above flood stage. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
A continuation of flooding from May, the Little Sioux River at Cherokee (gage site CHKI4) began the month at 3.70 feet above flood stage. Significant amounts of agricultural land remained flooded, and further impeded spring planting.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2019Every state in 2019This day in weather historyWarnings in Iowa, June 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: 835798, 835808, 835812, 835814, 835817, 835823, 835825, 835826, 835827, 835828.