(Omaha/Valley, NE) – Officials with the National Weather Service in Omaha, Sunday, said they had confirmed 12 EF-0 spin-up tornadoes associated with the derecho that moved through the region on Friday, May 24th. The Weather Service says “Quasi-Linear Convective System (QLCS) moved acrossthe area during the late night hours where several scattered tornado spin-ups were reported. QLCS tornadoes tend to be weaker and shorter-lived on average than those associated with supercell thunderstorms.”

In southwest Iowa, tornadoes occurred Friday south of Treynor, 3-miles east of Henderson, and two-miles north of Westphalia. Details are posted below:

..South of Treynor Tornado…

Survey Summary:
This very brief spin up remained near Aspen Road and 300th street south of Treynor. Three grain bins were destroyed as well as numerous trees.

Rating: EF0
Estimated Peak Wind: 83 mph
Path Length /statute/: 0.25 miles
Path Width /maximum/: 60 yards
Fatalities: 0
Injuries: 0

Start Date: 05/24/2024
Start Time: 03:00 AM CDT
Start Location: 4 S Treynor / Pottawattamie County / IA
Start Lat/Lon: 41.175 / -95.6151

End Date: 05/26/2024
End Time: 03:01 AM CDT
End Location: 3 S Treynor / Pottawattamie County / IA
End Lat/Lon: 41.1782 / -95.613

..Henderson Tornado…

Survey Summary:
This brief spin up tornado damaged trees at a farmstead as well as outbuildings.

Rating: EF0
Estimated Peak Wind: 74 mph
Path Length /statute/: 2.09 miles
Path Width /maximum/: 60 yards
Fatalities: 0
Injuries: 0

Start Date: 05/24/2024
Start Time: 03:10 AM CDT
Start Location: 3 E Henderson / Montgomery County / IA
Start Lat/Lon: 41.1316 / -95.3649

End Date: 05/24/2024
End Time: 03:10 AM CDT
End Location: 4 ENE Henderson / Montgomery County / IA
End Lat/Lon: 41.1582 / -95.3457

..Westphalia/Earling Tornado…

Survey Summary:
This brief spin-up tornado damaged roofs off an outbuilding and downed several trees.

Rating: EF0
Estimated Peak Wind: 80 mph
Path Length /statute/: 0.09 miles
Path Width /maximum/: 40 yards
Fatalities: 0
Injuries: 0

Start Date: 05/24/2024
Start Time: 03:13 AM CDT
Start Location: 2 N Westphalia / Shelby County / IA
Start Lat/Lon: 41.7524 / -95.3859

End Date: 05/24/2024
End Time: 03:13 AM CDT
End Location: 2 N Westphalia / Shelby County / IA
End Lat/Lon: 41.7531 / -95.3844

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EF Scale: The Enhanced Fujita Scale classifies tornadoes into the following categories:

EF0…Weak……65 to 85 mph
EF1…Weak……86 to 110 mph
EF2…Strong….111 to 135 mph
EF3…Strong….136 to 165 mph
EF4…Violent…166 to 200 mph
EF5…Violent…>200 mph

NOTE:
The information in this statement is preliminary and subject to change pending final review of the events and publication in
NWS Storm Data.