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EF0 tornado in Ogle County, Illinois

Tornado April 9, 2015 · Ogle County, Illinois

EF0
Rating
1.9 mi
Path length
100 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 100 yards (0.06 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF0 means. On the Enhanced Fujita scale, EF0 is light damage: shingles and siding peeled, gutters torn, branches broken, consistent with estimated gusts of 65–85 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 brief satellite tornado formed over far eastern Ogle County. The tornado was confirmed during an aerial survey. (Tornado 3 of 7).

The wider storm

Seven tornadoes were confirmed in north central Illinois in the NWS Chicago CWA. Six of the tornadoes formed from a single supercell. The atmosphere was ripe for severe weather due to highly anomalous moisture and instability for early April across the region. A strong low pressure system advanced into this favorable air mass. Combined with robust wind shear, this helped to trigger these potent storms. A long tracked violent tornado destroyed numerous homes and farmsteads along its path across north central Lee, eastern Ogle, northwest Dekalb, and southern Boone counties. This path included the far northwest side of Rochelle, Interstate-39, and a direct hit in the community of Fairdale where two fatalities occurred. This was the strongest tornado in the NWS Chicago CWA since the F5 tornado that struck Plainfield, IL on August 28th, 1990.

Began near Lindenwood (42.0583, -88.9752).

Other tornadoes from the same storm system

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

EF4 De Kalb County 2 deadEF1 De Kalb CountyEF1 Boone CountyEF1 McHenry CountyEF0 Boone County

Source: NOAA Storm Events Database, event 574248. Narratives are written by the National Weather Service forecast office that issued the report.

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