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EF1 tornado in Delaware County, Iowa

Tornado July 23, 2016 · Delaware County, Iowa

EF1

Rating

0.2 mi

Path length

10 yd

Path width

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 10 yards (0.01 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF1 means. On the Enhanced Fujita scale, EF1 is moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken, consistent with estimated gusts of 86–110 mph. The rating comes from a survey of the worst damage after the storm, not from a wind measurement, so it says as much about what the tornado hit as about how strong it was.

What the National Weather Service wrote

A public video of a waterspout crossing a portion of Lake Delhi and coming ashore and damaging some trees.

The wider storm

A disturbance interacting with a frontal system produced an area of severe thunderstorms with numerous damaging winds, some flash flooding and a few isolated, brief tornadoes.

Began near Turtle Creek Park (42.4109, -91.3927).

Other tornadoes from the same storm system

2 more tornadoes the National Weather Service filed under this storm episode.

EF1 Buchanan County EF0 Dubuque County

Source: NOAA Storm Events Database, event 653943. Narratives are written by the National Weather Service forecast office that issued the report.

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