A weak impulse dropped southward along the western side of a Great Lakes closed mid-level low, igniting isolated storms overnight. Weak shear and evaporation within a low-level dry airmass resulted in localized damaging wind gusts with the strongest storm.
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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 weak impulse dropped southward along the western side of a Great Lakes closed mid-level low, igniting isolated storms overnight. Weak shear and evaporation within a low-level dry airmass resulted in localized damaging wind gusts with the strongest storm.
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 8, 2:41 AM CST, 16 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 341 AM CDT Thu Jun 8 2023 .SHORT TERM...(Today and Tonight) Issued at 338 AM CDT Thu Jun 8 2023 KEY MESSAGES: 1. Isolated strong to severe storms with large hail/strong wind gusts possible west of Interstate 29 this afternoon and evening. 2. Possibly better chances for precipitation on Friday and Saturday, though rainfall amounts will generally remain on the low side. 3. Cooler temperatures for Friday through Sunday, then warming for the beginning of next week. The upper level ridge which has been parked across our area for the past few days has shifted into the western High Plains early this morning, while an upper level low continues to spin over the northeastern CONUS. A weak impulse tracking southward on the northerly upper level flow over our area - per the aforementioned features - has resulted in a few showers/isolated thunderstorms over western MN early this morning. Latest hi-res models indicate this activity to continue east of Interstate 29 through the morning hours, before finally dissipating by mid morning. A rather diffuse surface boundary is situated over the James River Valley this morning, and will only slide very slowly westward through the day. A moisture plume on the eastern side of this boundary may be the focus for thunderstorm development later this afternoon and evening as the atmosphere becomes increasingly unstable though the day - on the order of 1500-2000 J/kg west of Interstate 29 per latest soundings/model data. 0-6km bulk shear is weak over this area - between 15-25 kts, with the higher values toward the Interstate 29 corridor. Shear values continue to be higher as one moves east of Interstate 29 - upwards of 25 to 35 kts, though the instability is expected to be much weaker over that area. With the aforementioned instability, cannot completely rule out an isolated strong/severe storm west of Interstate 29 in the afternoon/evening, though with the weak bulk shear any storm would be short lived. The main threat would be large hail, with a weaker threat of strong winds with DCAPE just either side of 500 J/kg. Concurrent with the westward shift of the upper level ridge, the 850 mb thermal ridge will shift off to the west a bit, shaving off a few degrees from the highs when compared to Wednesday. Look for highs in the lower 90s west of Interstate 29, to lower to mid 80s east of there. Any thunderstorm activity is expected to diminish tonight as heating of the day is lost. Lows will drop into the into the upper 50s to lower 60s. .LONG TERM...(Friday through Wednesday) Issued at 338 AM CDT Thu Jun 8 2023 A more active period will be possible for Friday and Saturday as the upper level ridge begins to break down as a couple shortwaves dive southward on the eastern side of the ridge. While rainfall amounts will not be a drought buster, both the GEFS and ECMWF ensembles indicate high probabilities of at least a generalized tenth of an inch of precipitation during each 24 hour period for Friday and Saturday. Areas west of Interstate 29 will once again become unstable on Friday afternoon, with MLCAPE running around 1500-2000 J/kg. Even so, as has been the case in recent days, bulk shear will be weak - 20 kts or less, thus severe chances are low. Instability looks to be even lower for Saturday. As the ridge breaks down, 850 mb temperatures will cool through the period, with highs on Friday in the 80s, then into the 70s for Saturday as a cold front slides through the region. Rainfall chances then diminish by Saturday night as the front slides out of the area. Temperatures fall back to below normal for Sunday as a deepening upper level low over the Upper Mississippi Valley drives cooler air into our area. This low drifts eastward for the beginning of next week, allowing energy from a western CONUS upper level trough to be ejected northward into the Plains. This may bring some increasing chance of precipitation by the middle of the week, though ensembles would suggest amounts would be on the low side. Temperatures look to warm to back above normal for Tuesday and Wednesday. && .AVIATION...(For the 06Z TAFS through 06Z Thursday Night) Issued at 1030 PM CDT Wed Jun 7 2023 Showers are possible through the overnight, with one storm dropping south just west of KSUX through 04z/11PM. An area of showers in northeastern SD drops south through the early overnight, but expect these to weaken as they approach the area. Additional showers and storm chances return toward daybreak and during the afternoon/evening Thursday; however, have omitted from all sites given low confidence in coverage. Outside of convection, VFR conditions prevail with light southeasterly winds. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...JM LONG TERM...JM AVIATION...SG
Hazardous Weather Outlook National Weather Service Sioux Falls SD 859 PM CDT Wed Jun 7 2023 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-090200- 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- 859 PM CDT Wed Jun 7 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...Tonight. Showers and isolated storms taper off late this evening. Severe weather is not expected, but brief gusty winds to 45 mph and pockets of heavy rain are still possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Chances for thunderstorms continue off and on through Saturday with very low severe weather risk. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Sioux Falls radar (KFSD), 109 km away, was scanning. The volume nearest the first event began at 08:55 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Large trees and a grain bin were damaged by thunderstorm winds. Property and crop damage costs are rough estimates.
Wind-driven hail caused significant crop damage. Crop damage costs are rough estimates.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2023Every state in 2023This day in weather historyWarnings in Iowa, 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 2026-09-24. Each event’s entry at NCEI: 1111373, 1111372.