Much of the Des Moines River basin received from one to two inches of liquid equivalent in the week leading up to the minor flooding, including snow melt moisture from the historic blizzard on April 14 and subsequent snowfall less than a week later.
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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.
Much of the Des Moines River basin received from one to two inches of liquid equivalent in the week leading up to the minor flooding, including snow melt moisture from the historic blizzard on April 14 and subsequent snowfall less than a week later.
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 Apr 22, 9:30 PM CST, 4 hours 30 minutes earlier.
Area Forecast Discussion National Weather Service Sioux Falls SD 1030 PM CDT Sun Apr 22 2018 .SHORT TERM...(This evening through Monday) Issued at 221 PM CDT Sun Apr 22 2018 A really nice Spring day across the region, with light winds and temperatures near normal levels for the second half of April. Cooler easterly flow off the snowpack in Minnesota is keeping a few areas below 60, but elsewhere should see highs in the 60s. Overall, a relatively quiet forecast continues with little in the way of high impact weather. Tonight: A bit of cloud cover overnight, but another normal April night expected. Temperatures will fall into the 30s, with the coldest readings over the lingering snow in Iowa and Minnesota. Monday: It's shaping up to be a spectacular start to the new week on Monday. 925 mb temperatures will average 4-6 degrees warmer than we started Sunday out with. Even with light mixing, should see temperatures climb well into the 60s. A few 70s may also be possible. .LONG TERM...(Monday night through Sunday) Issued at 221 PM CDT Sun Apr 22 2018 Monday Night through Tuesday: Today's model guidance has trended 50 miles further northeast with the upper trough moving through the Central and Northern Plains on Tuesday. This system will bring an area of light rain to areas mostly west of I-29 by Tuesday morning. Higher rain amounts shouldn't really spread too far to the east given the systems expected southward drop into northern Kansas by late Tuesday. Wednesday: A slight warmup on Wednesday behind this system with southwesterly low level flow, but temperatures may still fall just below normal. Thursday: Really minimal changes to the forecast for Thursday as the next system quickly drops into the Northern US. A frontal boundary moves through prior to daybreak Thursday, with minimal Pacific moisture moving through with it. With most of the moisture lingering behind the front, only a passing area of sprinkles or very light rain will move through by Thursday afternoon. Friday-Sunday: Mid-level heights quickly build for the end of the week and upcoming weekend. This means good news for those that like above normal temperatures. A favorable westerly wind will push highs above normal and into the 60s Friday. This warmup will continue into the weekend, with highs above normal both days. Have blended forecast with warmer WPC guidance, given bias corrected grids are likely too cold. Models are still a bit split on the idea of a front moving through the area by Sunday. Either way, little in the way of precipitation is expected. && .AVIATION...(For the 06Z TAFS through 06Z Monday night) Issued at 1030 PM CDT Sun Apr 22 2018 VFR conditions expected through the TAF period. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...Dux LONG TERM...Dux AVIATION...JM
Hazardous Weather Outlook National Weather Service Sioux Falls SD 501 PM CDT Sun Apr 22 2018 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-232215- 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- 501 PM CDT Sun Apr 22 2018 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 No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Snow melt and runoff from periods of heavier rainfall briefly produced minor flooding with impact to lowland agricultural areas. River levels reached 1.7 feet above flood stage on the Des Moines at Windom (gage site WDOM5) on April 28.
Snow melt and runoff from periods of heavier rainfall briefly produced minor flooding with impact to lowland agricultural areas. River levels reached 1.7 feet above flood stage on the Des Moines at Windom (gage site WDOM5) on April 28.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2018Every state in 2018This day in weather historyWarnings in Minnesota, April 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 2026-09-24. Each event’s entry at NCEI: 772152, 772153.