A widespread significant damaging wind storm tracked across nearly all of eastern Nebraska and western Iowa on the morning of July 12. These storms produced widespread winds of 60 to 80 mph, with embedded stronger downbursts with wind speeds up to 100 mph. The strongest measured wind gust was 82 mph in Dodge County NE, but some of the high-end straight line wind damage supports embedded wind speeds up to 100 mph.
This storm also produced a few embedded tornadoes. Some of the tornado tracks were only identified by narrow swaths of damage through mature cornfields, with minimal damage otherwise and peak wind speeds similar to the nearby downburst winds. All but one of the tornadoes was preceded by a Wireless Emergency Alert. There were 0 reported injuries or fatalities.

Thunderstorm Wind in SHELBY, IOWA
From 12-JUL-23 05:26:00 to 12-JUL-23 05:26:00 (CST-6)
Location: HARLAN
Magnitude: 65.00 EG
Reported by: Public

Public reported a semi blown over and part of roof blown off a building.

Tornado in POTTAWATTAMIE, IOWA
From 12-JUL-23 05:28:00 to 12-JUL-23 05:30:00 (CST-6)
Location: HANCOCK
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A tornado impacted a farm on Reflection Lane. There was significant tree damage, windows were blown out of the home, and a large barn had nearly all walls collapse and the roof was removed. There was damage to grain bins farther to the east, and trees were topped to the west along the Nishnabotna River.

Thunderstorm Wind in MONTGOMERY, IOWA
From 12-JUL-23 06:15:00 to 12-JUL-23 06:15:00 (CST-6)
Location: VILLISCA
Magnitude: 56.00 EG
Reported by: Public

Public reported trees blown down at the golf course.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 12-JUL-23 05:17:00 to 12-JUL-23 05:17:00 (CST-6)
Location: LAKE MANAWA
Magnitude: 70.00 EG
Reported by: Broadcast Media

Broadcast media reported the pool roof blown off at Titan Hill Intermediate School.

Thunderstorm Wind in MONONA, IOWA
From 12-JUL-23 05:00:00 to 12-JUL-23 05:00:00 (CST-6)
Location: BLENCOE
Magnitude: 51.00 MG
Reported by: Public

A personal weather station measured a peak wind gust of 59 mph.

Thunderstorm Wind in HARRISON, IOWA
From 12-JUL-23 05:03:00 to 12-JUL-23 05:03:00 (CST-6)
Location: LOGAN
Magnitude: 78.00 EG
Reported by: Public

Public reported roof damaged and windows blown out on house.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 12-JUL-23 05:38:00 to 12-JUL-23 05:38:00 (CST-6)
Location: LAKE MANAWA
Magnitude: 61.00 EG
Reported by: Public

Several reports received from the public of tree damage.

Thunderstorm Wind in HARRISON, IOWA
From 12-JUL-23 05:16:00 to 12-JUL-23 05:16:00 (CST-6)
Location: HARD SCRATCH
Magnitude: 50.00 MG
Reported by: Public

A personal weather station measured a peak wind gust of 58 mph.

Tornado in HARRISON, IOWA
From 12-JUL-23 05:05:00 to 12-JUL-23 05:14:00 (CST-6)
Location: HARD SCRATCH
Tornado F-scale: EF2
Reported by: NWS Storm Survey

A tornado developed near Overton Road and 286th Street in Harrison County Iowa. The tornado moved rapidly to the east where it made a direct impact on a home. At this location, the home roof was removed, windows broken, siding ruined, numerous trees snapped, a shed was demolished, and numerous items were thrown up to a half mile downstream. The convergent damage pattern at this location, eyewitness reports of wind direction, along with the 80-yard-wide path of more intense damage gives great confidence that this was a tornado. Winds at this location were estimated at 120 mph based on damage. The tornado moved quickly southeast, causing substantial tree damage with snapped trunks being common along the continued 50 to 100 yard wide track. The tornado moved through neighborhood of acreages along Quentin trail where it snapped many trees but moved in between the homes. The track then became more intermittent for a couple miles before it partially removed the roof of a home along 296th Street and caused additional narrow tree damage for the next two miles. The final damage point that was pretty clearly tornado damage was near 305th and Upton where 3 grain bins were crumpled and blown downstream and a machine shed sustained substantial damage. Beyond this point, the tree damage was sporadic and more evident of the larger scale wind field. Should also note that to the west of this tornado track, there was a debris signature evident on radar, but the damage was much more consistent with a focused downburst or series of downbursts that moved up from the Missouri Valley into the Loess Hills and may have helped to loft light leafy debris. This downburst likely led to the development of the eventual tornado.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 12-JUL-23 05:20:00 to 12-JUL-23 05:20:00 (CST-6)
Location: NEOLA
Magnitude: 56.00 EG
Reported by: Public

Public reported siding blown off of home.

Thunderstorm Wind in SHELBY, IOWA
From 12-JUL-23 05:23:00 to 12-JUL-23 05:23:00 (CST-6)
Location: SHELBY
Magnitude: 56.00 EG
Reported by: Public

Public reported large trees blown down and roof damaged on home.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 12-JUL-23 05:24:00 to 12-JUL-23 05:24:00 (CST-6)
Location: HONEY CREEK
Magnitude: 58.00 MG
Reported by: Public

A personal weather station measured a peak wind gust of 67 mph.

Thunderstorm Wind in HARRISON, IOWA
From 12-JUL-23 05:08:00 to 12-JUL-23 05:08:00 (CST-6)
Location: HARD SCRATCH
Magnitude: 50.00 MG
Reported by: Public

A personal weather station measured a peak wind gust of 58 mph.

Thunderstorm Wind in HARRISON, IOWA
From 12-JUL-23 05:10:00 to 12-JUL-23 05:10:00 (CST-6)
Location: BEEBEETOWN
Magnitude: 52.00 EG
Reported by: Public

Public reported a garage door blown in.

Tornado in SHELBY, IOWA
From 12-JUL-23 05:17:00 to 12-JUL-23 05:19:00 (CST-6)
Location: PORTSMOUTH
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A tornado developed just north of 1150th street and east of Highway 191 where it destroyed two barns and damaged others. The tornado track continued east with evidence of convergent flow pattern within the debris field and the cornfield as it tracked to the east.

Tornado in POTTAWATTAMIE, IOWA
From 12-JUL-23 05:32:00 to 12-JUL-23 05:33:00 (CST-6)
Location: AVOCA
Tornado F-scale: EF0
Reported by: NWS Storm Survey

There is a distinct tornado track through crop fields approximately 40 yards wide at the max. The track begins in a soybean field and then moves into the corn field where the narrow track and convergent flow pattern are most pronounced. It crosses a creek, breaks a few branches, and then through another corn field where there is convergent flow into the center of the track from the edges.