HUMBOLDT, Iowa — New details released about a brief tornado in northern Humboldt County last Thursday establish it as an EF0.

EF-0 is the weakest tornado rating on the Enhanced Fujita Scale, with winds ranging from 65 to 85 mph. The survey reported 65 ...

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The first tornado was rated an EF-1 on the Enhanced Fujita Scale, which has six levels, ranging from EF-0 to EF-5. The peak ...

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Visible damage from the initial tornado amounted to a couple of trees and blown-over highway signs. The weather service rated it an EF-1, the lowest rating on the Enhanced Fujita Scale.