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Public Information Statement
National Weather Service Des Moines IA
228 PM CDT Thu Aug 28 2025

...NWS Damage Surveys for July 28th and August 17th Tornado Events...

Storm surveys for tornadoes in northern Iowa have been completed
utilizing photographic evidence and high resolution satellite imagery.

Two additional tornadoes have been confirmed, one to the southwest of Crystal
Lake in Hancock County, with a second to the west of Forest City in
Winnebago County. Both tornadoes occurred entirely over agricultural land.


.Crystal Lake Tornado...


Rating:                 EF-U
Estimated Peak Wind:    Unknown
Path Length /statute/:  1.24 miles
Path Width /maximum/:   20 yards
Fatalities:             0
Injuries:               0

Start Date:             07/28/2025
Start Time:             11:50 PM CDT
Start Location:         3 SW Crystal Lake / Hancock County / IA
Start Lat/Lon:          43.1899 / -93.8371

End Date:               07/28/2025
End Time:               11:52 PM CDT
End Location:           2 SSW Crystal Lake / Hancock County / IA
End Lat/Lon:            43.1887 / -93.8131

Survey Summary:
High resolution satellite imagery revealed a clear, narrow tornado track
in agricultural fields beginning just east of the Lake George Wildlife
Management area in Hancock County. The tornado traveled eastward for
approximately one and a quarter miles crossing Hill Ave and dissipating
just west of Iowa Ave. The rating for the tornado is EF-U for unknown
wind speed due to the lack of official damage indicators in the tornadic path.

.West of Forest City Tornado...

Rating:                 EF-U
Estimated Peak Wind:    Unknown
Path Length /statute/:  0.45 miles
Path Width /maximum/:   20 yards
Fatalities:             0
Injuries:               0

Start Date:             08/17/2025
Start Time:             06:13 PM CDT
Start Location:         3 NNE Crystal Lake / Winnebago County / IA
Start Lat/Lon:          43.265 / -93.7775

End Date:               08/17/2025
End Time:               06:15 PM CDT
End Location:           3 NNE Crystal Lake / Winnebago County / IA
End Lat/Lon:            43.2608 / -93.7719

Survey Summary:
Photographic evidence and high resolution satellite imagery revealed
a clear landspout type tornado track in agricultural fields beginning just
east of 100th Ave, between 330th and 350th Avenues.  The tornado tracked
northward for a short distance, before crossing 100th Ave, and then traveled
northwest through another ag field.  The tornado dissipated very near
a farmstead just south of 350th Ave. The rating for the tornado is also
EF-U for unknown wind speed due to the lack of official damage indicators
in the tornadic path.

&&

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

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


$$

NWS DMX