Linear storms developed near a frontal boundary, moving across southeast South Dakota and into northwest Iowa and southwest Minnesota early on June 24. Within an environment of shear, a strong low-level jet, and strong DCAPE, some storms produced severe-level winds.
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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.
Linear storms developed near a frontal boundary, moving across southeast South Dakota and into northwest Iowa and southwest Minnesota early on June 24. Within an environment of shear, a strong low-level jet, and strong DCAPE, some storms produced severe-level winds.
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 Jun 23, 9:55 PM CST, 2 hours 32 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1055 PM CDT Fri Jun 23 2023 .SHORT TERM...(This Evening through Saturday) Issued at 251 PM CDT Fri Jun 23 2023 KEY MESSAGES 1) Thunderstorm chances increase further overnight. A few storms may be severe, mainly west of I-29, with damaging winds the primary threat. 2) Shower and occasional thunderstorm chances linger into the weekend but the better severe weather threat begins to move east. 3) Cooler temperatures this weekend begin to rebound some early next week with returning rain chances by the middle of the week. Afternoon/Evening: In the near term, earlier convection along the 850:700 mb front produced an outflow driving further activity east currently into the I-29 corridor. Current radar shows the parent outflow gaining pretty good distance out ahead of the convection itself which may help to limit its eastward extent. Overnight: Pronounced vort lobe ejects out of the Rockies this evening and should spark robust thunderstorm development across western NE/SD. As this activity moves east into central and eastern SD, we may see the activity focus into a couple of different areas. The first area (and probably that with the highest concern for strong to severe) may be near and south of a Chamberlain to Beresford line as previously mentioned storms to our west dive down the instability gradient and along the nose of the LLJ. A second area will peel northeastward with the main mid level wave across northern SD into ND. In between, a more narrow line of storms may exist. In terms of severe weather, the primary area of concern will likely end up along and especially south of I-90 in the form of damaging wind as initial deep layer shear values may allow for balance of the resultant cold pool before becoming too dominant later into the night. Given thermodynamic profiles and DCAPE values, a couple wind gusts up to 75 mph seem plausible, mainly near/west of the James River, thru the MO River Valley. Given the expected linear storm mode by the time activity arrives into our coverage area, hail is a secondary concern but could be up to 1.5 inch in diameter if a more discrete storm develops. At this time, storm progression is expected to be enough to limit any widespread flash flooding threat. With this said, warm cloud depths in excess of 10 kft and sufficiently high progged 1000-500 mb RH values, wouldn't rule out a more isolated flash flood threat which is covered by a Slight from WPC for excessive rainfall. Local PMM from the HREF does show isolated pockets of 2-4 inches of rain which should be able to be handled as long as it doesn't reside over a more urban area or one that has seen more recent heavier rainfall. .LONG TERM...(Saturday Night through Friday) Issued at 251 PM CDT Fri Jun 23 2023 Saturday: Remaining daybreak hour showers and thunderstorms will move east of the coverage area by mid morning and likely leave a fairly worked over atmosphere in their wake. By midday, additional showers and thunderstorms may begin to form under the mid level wave overhead. The surface boundary itself should be across our far eastern counties by the afternoon hours which would be where any better severe weather threat would be anticipated. Suspect this will end up just to the east of our coverage area. That's not so say a more isolated marginal hail threat couldn't develop under the post- frontal activity. Highs on Saturday will end up cooler than recent days with mid 70s to mid 80s toward the Hwy 20 corridor. Sunday: Closed mid/upper low spins over WI for Sunday with close enough proximity to allow for scattered showers mainly near and east of I-29. Breezy to gusty northwesterly winds within a tightened SPG will usher in highs mainly in the 70s to near 80. Monday and Tuesday: Upper ridge rebuilds for early next week and should spell mostly quiet conditions. Temperatures will rebound a bit back into the 80s. Wednesday and Thursday: With the top of the ridge sitting overhead, a pattern conducive for ridge riding waves may allow for occasional convection chances, the first of which may arrive Tuesday night. With unknowns regarding this convection and any residual debris it leaves behind, forecast details beyond the early week period are more murky. && .AVIATION...(For the 06Z TAFS through 06Z Saturday Night) Issued at 1047 PM CDT Fri Jun 23 2023 VFR conditions deteriorate as multiple areas of convection move through tonight, with additional shower and storm chances Saturday afternoon/evening. The first area is moving north from northeastern NE, with another area across western SD/NE which will be moving to the east/northeast through the night. MVFR and lower conditions are expected with storms, which could produce locally heavy rainfall. Some storms overnight, especially west of I-29, could become severe. The main threat would be strong winds to 65 knots, and secondary threat of large hail. Could see some periodic VFR conditions in breaks in convection Saturday, but confidence is low. Winds switch from south/southeast early in the period to west/northwest late Saturday night behind a front. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...Kalin LONG TERM...Kalin AVIATION...SG
Hazardous Weather Outlook National Weather Service Sioux Falls SD 356 PM CDT Fri Jun 23 2023 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-242100- 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- 356 PM CDT Fri Jun 23 2023 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...This afternoon and tonight. Showers and thunderstorms increase in coverage tonight. Severe weather is possible west of Interstate 29, with wind gusts to 75 mph as the main threat. Hail to ping pong ball sized is the secondary threat. Storms should diminish in coverage and severity toward daybreak Saturday. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Additional thunderstorms are possible Saturday. A few storms could become strong to severe east of Interstate 29 in the afternoon, with large hail and damaging winds being the main threat. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Aberdeen radar (KABR), 201 km away, was scanning. The volume nearest the first event began at 06:25 UTC.
10 thunderstorm wind. Local standard time, as filed.
Thunderstorm wind gusts up to 58 mph were measured at Automated Weather Observing System site K9V9 near Chamberlain.
Thunderstorm wind gusts up to 64 mph were measured at a personal weather station in Springfield.
Thunderstorm wind gusts up to 61 mph were measured at a personal weather station in Tabor.
Thunderstorm wind gusts downed several large tree limbs at Lewis and Clark Campground.
Thunderstorm wind gusts removed a roof from a building on the north side of Yankton.
Thunderstorm wind gusts downed a large tree limb.
Thunderstorm wind gusts up to 65 mph were measured by South Dakota Road Weather Information System site SD508 3 miles south-southwest of Beresford.
Up to three inch diameter branches were broken by thunderstorm wind gusts.
Thunderstorm wind gusts up to 58 mph were measured by the Automated Surface Observing System site KFSD 3 miles north of Sioux Falls.
Thunderstorm wind gust to 59 mph was measured by a personal weather station 1 mile southwest of Crooks.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2023Every state in 2023This day in weather historyWarnings in South Dakota, June 2023
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: 1111531, 1111533, 1111534, 1111586, 1111575, 1111588, 1111546, 1111585, 1111549, 1111574.