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Public Information Statement
Issued: 2:37 PM CDT Sep. 21, 2018 – National Weather Service


... NWS damage survey for Superior Iowa tornado - update 1... .

.Tornado number 1 near Superior Iowa...

Rating: EF-1
estimated peak wind: 99 mph
path length: estimated at 1 mile
path width: 25 yards
fatalities: 0
injuries: 0

Start date: September 20 2018
start time: 5:22 PM CDT
start location: west of Superior, Iowa

End date: September 20 2018
end time: 5:24 PM CDT
end location: east of Superior, Iowa

survey summary: observational equipment near Superior ethanol
directly measured 99 mph as tornado moved through. Assistance was provided
by the Dickinson County emergency management office with photos and aerial photo
assistance.

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 event and publication in
NWS storm data.


237 PM CDT Fri Sep 21 2018


... NWS damage survey for Superior Iowa tornado - update 1... .

.Tornado number 1 near Superior Iowa...

Rating: EF-1
estimated peak wind: 99 mph
path length: estimated at 1 mile
path width: 25 yards
fatalities: 0
injuries: 0

Start date: September 20 2018
start time: 5:22 PM CDT
start location: west of Superior, Iowa

End date: September 20 2018
end time: 5:24 PM CDT
end location: east of Superior, Iowa

survey summary: observational equipment near Superior ethanol
directly measured 99 mph as tornado moved through. Assistance was provided
by the Dickinson County emergency management office with photos and aerial photo
assistance.

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 event and publication in
NWS storm data.



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