In semi similar fashion to the strong and severe storms experienced on the previous morning (29th of June), storms initiated over portions of northern Kansas and southern Nebraska in conjunction with the low level jet in the very early hours of the 29th. These storms, steered by easterly mean flow, progressed across far southern Iowa and northern Missouri within an environment consisting of…
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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 DMX wrote it up.
In semi similar fashion to the strong and severe storms experienced on the previous morning (29th of June), storms initiated over portions of northern Kansas and southern Nebraska in conjunction with the low level jet in the very early hours of the 29th. These storms, steered by easterly mean flow, progressed across far southern Iowa and northern Missouri within an environment consisting of around 2000 J/kg MUCAPE, 30 to 40+ kts of effective shear, and a very tight north-south gradient of DCAPE (most favorably into Missouri). Storms grew upscale through the early morning hours and primarily produced strong and damaging winds. There were a couple of severe hail reports as well along with a reported lightning strike that effective blew a tree apart.
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 Des Moines, IA wrote its last area forecast discussion before the first event at Jun 30, 1:58 AM CST, 2 hours 52 minutes earlier.
Area Forecast Discussion National Weather Service Des Moines IA 258 AM CDT Fri Jun 30 2023 .DISCUSSION.../Today through Thursday/ Issued at 254 AM CDT Fri Jun 30 2023 Key Messages: - Storms this morning with a few severe storms possible over southern Iowa. - Storm chances persist this afternoon through Saturday though severe weather chances look low. - For the next 7 days, the coolest day will be Saturday and the warmest looks to be July 4th. Thunderstorms are once again ongoing across Nebraska this morning with a weakening complex over northeast Nebraska and more vigorous activity over southeast Nebraska in the area of greater instability and near the nose of the low level jet. There is a third area of storms over north central Kansas that is lifting northeast as well. It is a much less volatile setup than yesterday morning but a low end severe weather threat with damaging winds and large hail possible. The northern area of storms may move into northern Iowa but the severe weather threat will be quite low. The convection over Kansas and southeast Nebraska will continue to lift northeast with the theta-e advection region and there will be a chance for a few severe storms over southern Iowa and closer to the MUCAPE instability axis that will be across that area. These storms will move through the area this morning. As mentioned, instability and forcing is not as strong as Thursday but 0-3 km theta-e difference of 25-30K are favorable for cold pool development. The DCAPE gradient is right at the IA/MO border and focused to the south and the lack of DCAPE and the 0-3 km theta-e further north will be a limiting factor for damaging winds north of Highway 34 or the lower 2 tiers of counties across IA. The western long wave trough is crossing the Rocky Mountain range this morning and will move into the Western Plains this afternoon. Scattered thunderstorm development this afternoon is possible in response to a lead short wave ahead of the trough. Additional storms are possible tonight and into Saturday. The severe weather threat this afternoon through Saturday is low though a few strong storms are possible. Still monitoring the potential for landspout funnels Saturday afternoon as the upper trough passes overhead. This open wave is not as favorable as having a closed low but the vorticity stretching potential is good with 0-3 km CAPE values greater than 100 J/kg and a weak nearly stationary boundary over northern Iowa. The trough passes to the east by Sunday leaving Iowa in weak northwest flow into Monday and that flow will transition to more westerly/zonal flow Tuesday and for much of next week. Still have precipitation chance mention in the forecast for July 4th, mainly over northern Iowa. These chances will be dependent on a boundary placement dropping south through the Dakotas and Minnesota. At this time, any chance would be late and confined to northwest Iowa. Greater precipitation chances are still targeting July 5th. Otherwise, some lingering fog early this morning with much of the smoke having dispersed or has moved to the east. Saturday still looks to be the coolest day with mostly cloudy skies and precipitation around with highs in the 70s to low 80s. Warmer air does arrive with the transition to westerly flow next week and this may bring widespread highs in the 90s next Tuesday, the 4th, before the boundary arrives. && .AVIATION.../For the 06Z TAFS through 06Z Friday night/ Issued at 1143 PM CDT Thu Jun 29 2023 VFR conditions remain across all terminals this evening. A bit better signal for isolated patchy fog has been seen in recent guidance this evening, largely occurring over KDSM and KOTM until sunrise before dissipating. Otherwise still watching trends with the expected showers and storms Friday morning. Recent trends keep best chances for storm activity across the south, impacting KOTM and KDSM around 12z and lasting until roughly 17-18z. Beyond that, there are general chances for scattered showers and thunderstorms across the state for the remainder of the period, though uncertainty is on the higher end at this time. Will have to see how the morning activity plays out, which will influence the coverage, timing and intensity of any possible storms later in the day. Will continue to watch over changes and update as needed. Winds will remain on the light side, with overall cloud cover looking to mainly range between mid to upper level clouds. && .DMX WATCHES/WARNINGS/ADVISORIES... NONE. && DISCUSSION...Donavon AVIATION...Bury
Hazardous Weather Outlook National Weather Service Des Moines IA 310 AM CDT Fri Jun 30 2023 IAZ004>007-015>017-023>028-033>039-044>050-010815- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene- Boone-Story-Marshall-Tama- 310 AM CDT Fri Jun 30 2023 This Hazardous Weather Outlook is for portions of northern Iowa. .DAY ONE...Today and tonight A few scattered thunderstorms are possible this morning with more widespread thunderstorm activity toward southern Iowa. Scattered thunderstorms are expected again later this afternoon and through the evening. A few stronger storms are possible, but overall the severe threat is low. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Additional scattered thunderstorms are possible on Saturday and into Sunday morning. At this time the severe potential remains low. Thunderstorm chances will then return around Tuesday to Wednesday next week. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. IAZ057>062-070>075-081>086-092>097-010815- Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison- Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello- Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 310 AM CDT Fri Jun 30 2023 This Hazardous Weather Outlook is for portions of southern Iowa. .DAY ONE...Today and tonight Storms will move across southern Iowa this morning which may be severe, with wind and hail the main hazards. Scattered thunderstorms are expected again later this afternoon and through the evening. A few stronger storms are possible, but overall the severe threat is low. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Additional scattered thunderstorms are possible on Saturday and into Sunday morning. At this time the severe potential remains low. Thunderstorm chances will then return around Tuesday to Wednesday next week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this morning. Hagenhoff
The Des Moines radar (KDMX), 83 km away, was scanning. The volume nearest the first event began at 10:50 UTC.
8 thunderstorm wind, 2 lightning, 1 hail. Local standard time, as filed.
Public relayed photo of a tree blown apart by a lightning strike. No other apparent damage to the residence at the time. Time matched to CG lightning data.
Trained spotter reported quarter sized hail. Also estimated wind gusts to around 40 mph at the time.
Law enforcement reported tree branch down on powerlines. Time estimated from radar.
Personal weather station measured 58 mph wind gust.
Law enforcement reported powerlines and trees down. This is a delayed report.
Emergency manager reported grain bin moved and damaged, as well as signs along the road bent over. This is a delayed report and time estimated from radar.
Personal weather station measured 66 mph wind gust.
Lamoni Municipal Airport measured 67 mph wind gust.
Post office reported large tree branches down throughout town and power remains out at the time.
House fire started by lightning strike. The home experienced significant damage to the roof and upper floor. Time matched to CG lightning data.
KIIC relayed report of 63 mph wind gusts.
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: 1106587, 1106588, 1106589, 1106590, 1106591, 1106592, 1106593, 1106594, 1106595, 1107847, 1106596.