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EF1 tornado in Lake County, Illinois

Tornado August 2, 2015 · Lake County, Illinois

EF1
Rating
7.5 mi
Path length
300 yd
Path width
$1.0M
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 300 yards (0.17 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

The tornado touched down near Cedar Lake Road in Round Lake where tree damage occurred. The tornado moved east and damaged hundreds of trees along the 7.5 mile long path, including dozens that were snapped at the base or uprooted. The most significant tree damage was noted in the subdivisions of Grayslake and Wildwood. A roof was blown off of a restaurant along Illinois Route 134 with a sign from the restaurant ending up over two miles away in Grayslake. Several homes and businesses suffered roof damage from either falling trees or loss of shingles. A large part of the roof of the Grayslake Central High School was blown across the street. A nearby skatepark was heavily damaged. The last points of damage were noted along Illinois Route 120 just west of I-94 in unincorporated Wildwood.

The wider storm

An isolated supercell thunderstorm developed over north central Illinois and moved across portions of the Chicago metropolitan area during the afternoon of August 2nd, producing large hail and severe winds. A 35 year old man was killed at an outdoor event in Wood Dale when a large tent collapsed causing a beam to strike the man. Another 20 people were injured, including three seriously injured. One of the seriously injured, an 81 year old woman died from her injuries in January 2016. Additional thunderstorms formed later in the evening producing severe weather, including a tornado near Grayslake.

Began near Round Lake (42.3503, -88.0972).

Source: NOAA Storm Events Database, event 599437. Narratives are written by the National Weather Service forecast office that issued the report.

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