Beneath a broad stratiform area of precipitation which expanded from earlier and stronger convection across south central South Dakota and central Nebraska, a wake low developed across southeast South Dakota by late evening. In a narrow zone from near Mitchell to north of Pipestone, winds suddenly increased to 40 to 50 mph, with a brief period of gusts from 58 to 65 mph.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Beneath a broad stratiform area of precipitation which expanded from earlier and stronger convection across south central South Dakota and central Nebraska, a wake low developed across southeast South Dakota by late evening. In a narrow zone from near Mitchell to north of Pipestone, winds suddenly increased to 40 to 50 mph, with a brief period of gusts from 58 to 65 mph.
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 7, 4:43 PM CST, 5 hours 17 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 543 PM CDT Sat May 7 2022 .SHORT TERM...(This Evening through Sunday) Issued at 252 PM CDT Sat May 7 2022 As of mid afternoon, southeast winds continue to gust in the 30s and 40s. With mixing having slightly overachieved around mid day, temperatures have quickly risen into the 70s across the region, creating elevated fire danger across parts of southwest MN. Winds will remain gusty ahead of the approaching sfc trough through the evening. Early this evening, scattered thunderstorms are expected to develop with pressure falls along the inverted sfc trough across central SD and western NE. 0-6km shear of 40-55kts will be sufficient to initially produce supercells, but this activity should congeal into more of an MCS (or two) as it tracks into south central SD (and northern SD) this evening. Soundings support elevated storms, but instability is limited with MUCAPE at 1000-2000 J/kg. Steep mid level lapse rates early this evening will make for an isolated severe weather threat with large hail up to half dollar size and damaging winds up to 70 mph (with DCAPE > 1000 J/kg). 12z and 18z CAM guidance eventually focuses on two areas of severe weather threat this evening, north of the Hwy 14 corridor in northeast SD and along the MO River Valley. The nocturnal LLJ will continue to fuel WAA for showers and storms persisting overnight and into Sunday morning, but expect the severe weather threat to largely dissipate after midnight as instability wanes and showers and storms spread east into the eastern Dakotas/NE. Weak instability coupled with lingering low level moisture will make for a cloudy start to Mother's Day Sunday. Despite rainfall interrupting outdoor plans, it should largely be beneficial across the region. It's likely for areas along and west of the James River Valley to see over a half inch of rain by Sunday with isolated 1+ inch amounts. Further east, parts of northwest IA and southwest MN may much lower amounts but should still see some appreciable amounts. Showers and storms should progress east of I-29 by Sunday afternoon. Conditions for outdoor activities will really improve Sunday afternoon west of I-29 with clouds clearing and lighter southerly winds. Insolation will warm areas along and west of the James River Valley well into the 70s Sunday, but we'll see a cooler day where clouds and rain linger longest east of I-29 with highs only reaching the 60s. .LONG TERM...(Sunday Night through Saturday) Issued at 252 PM CDT Sat May 7 2022 On Sunday evening, attention turns to another round of convection developing in western and central SD and the NE panhandle, sparked by a stout mid level wave rushing northeastward and enhanced LLJ- induced WAA. Though deep layer shear remains plentiful for maintaining updrafts, evening instability (MUCAPE 1500J/kg at best) will be greatly limited. The best forcing resides near/west of the MO River Valley in central SD, until the southeasterly LLJ and warm front lift north overnight. At minimum, this should bring increasing stratus and WAA induced showers and thunderstorms. Rainfall amounts will be highest near/north of a Lake Andes to Mitchell to Marshall line, where the best chance of > 0.25 inches of rain resides. As a reasonable worst case scenario, agree with the previous shift that increasing mid level lapse rates, instability, and LLJ forcing could prompt elevated storms to produce occasional hail. Though drier further south/east, wouldn't be surprised to see light rain/drizzle elsewhere amidst stratus. Monday will start with stratus blanketing much of the region, but it should end as a largely dry and warm day. As the sfc low rushes northeast, a weak cool front slides through and CAA combined with diurnal mixing should clear out clouds in the afternoon. Westerly winds and insolation bring breezy highs ranging from near 70 degrees (central SD) to the mid 80s in parts of northwest IA. Expect warm, mainly dry weather through Tuesday as Monday's front stalls to our southeast and omega blocking sets up aloft. Confidence in the forecast declines Wednesday as broad WAA lifts warmer, moist air back north into the region ahead of a stronger CO low swinging in via southwesterly flow aloft. There is some consensus that Wednesday will be the warmest day of the week with the operational NBM creeping highs near 90 degrees in south of the I-90 corridor and suggesting near record heat. Currently this seems reasonable but will need to be wary of outlier hot CMC ensemble guidance skewing temperatures unreasonably warm (5-10 deg hotter than all other guidance). Will additionally need to monitor for potential for convection with the upcoming disturbance Wednesday evening through Thursday and again over the weekend, but poor model agreement in any details makes for low confidence at this range. && .AVIATION...(For the 00Z TAFS through 00Z Sunday evening) Issued at 540 PM CDT Sat May 7 2022 Showers and thunderstorms will spread across the area tonight into early Sunday. In addition to localized MVFR/IFR conditions, any stronger storms could bring stronger erratic winds and hail. Stratus will lift from west to east later in the day on Sunday. Southeast winds will gust around 25 kts through much of the TAF period, though begin to diminish later on Sunday afternoon. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...BP LONG TERM...BP AVIATION...JM
Hazardous Weather Outlook National Weather Service Sioux Falls SD 414 AM CDT Sat May 7 2022 IAZ012>014-020>022-031-032-NEZ013-014-SDZ070-071-080915- Sioux-O'Brien-Clay-Plymouth-Cherokee-Buena Vista-Woodbury-Ida- Dixon-Dakota-Union- 414 AM CDT Sat May 7 2022 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, northeast Nebraska, and southeast South Dakota. .DAY ONE...Today and Tonight Wind gusts up to 35 mph will be possible on Saturday. Use caution if working outside due to elevated fire weather concerns. Scattered thunderstorms will move into the area after midnight and through daybreak Sunday. While widespread severe storms are not expected, an isolated storm capable of marginally severe hail may be possible. .DAYS TWO THROUGH SEVEN...Sunday through Friday Scattered thunderstorms may linger into Sunday morning, bringing a risk for small hail to the area. Additional thunderstorms will be possible Sunday night into Monday. While widespread severe storms are not expected, an isolated storm capable of marginally severe hail may be possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time. SDZ038-039-050-052>054-057>061-063>066-068-069-080915- Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Brule-Aurora- Davison-Hanson-McCook-Charles Mix-Douglas-Hutchinson-Turner- Bon Homme-Yankton- 414 AM CDT Sat May 7 2022 This Hazardous Weather Outlook is for portions of central South Dakota, east central South Dakota, south central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Winds may gust over 35 mph at times today. Elevated fire danger may be possible this afternoon. Scattered thunderstorms may develop late this afternoon or early evening over central South Dakota and Nebraska. This activity will move east and northeast into the area after dark, bringing a risk for a few storms capable of hail up to half dollar size and isolated 60 mph wind gusts. The peak severe weather risk will be from 7pm to 12am. .DAYS TWO THROUGH SEVEN...Sunday through Friday Scattered thunderstorms may linger into Sunday morning, bringing a risk for small hail to the area. Additional thunderstorms will be possible Sunday night into Monday. While widespread severe storms are not expected, an isolated storm capable of marginally severe hail may be possible. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed between 7pm Saturday and 12am Sunday. IAZ001>003-MNZ071-072-080-081-089-090-097-098-SDZ040-055-056-062- 067-080915- Lyon-Osceola-Dickinson-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Brookings-Lake-Moody-Minnehaha- 414 AM CDT Sat May 7 2022 This Hazardous Weather Outlook is for portions of northwest Iowa, southwest Minnesota, east central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Winds may gust over 35 mph at times today. Elevated fire danger may be possible this afternoon. Scattered thunderstorms may develop across portions of central South Dakota and Nebraska Saturday evening. This activity will move east and northeast during the overnight hours. The risk for severe storms is low, but a few storms could produce small hail. .DAYS TWO THROUGH SEVEN...Sunday through Friday Scattered thunderstorms may linger into Sunday morning, bringing a risk for small hail to the area. Additional thunderstorms will be possible Sunday night into Monday. While widespread severe storms are not expected, an isolated storm capable of marginally severe hail may be possible .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Non-thunderstorm wake low winds caused a machine shed to collapse 10 miles southwest of Lake Benton. Property damage costs are a rough estimate.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2022Every state in 2022This day in weather historyWarnings in Minnesota, May 2022
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: 1029612.