EF1 tornado in Bond County, Illinois

Tornado April 22, 2011 · Bond County, Illinois

EF1

Rating

18.2 mi

Whole path

500 yd

Path width

NOAA records this tornado county by county. Its path ran through Madison County → Clinton County → Bond County; the totals above are for the whole tornado.

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 500 yards (0.28 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 crossed from Clinton County into Bond County where it continued to snap and uproot trees, severely damage outbuildings and cause minor roof damage to homes before it finally dissipated around 930 pm about 7 miles south of Greenville. The maximum intensity for this segment was rated EF1 and was on the ground for 8.6 miles before lifting and dissipating. The maximum width of damage was 500 yards. As for the entire tornado, it was rated EF2, with maximum wind speeds of 130 mph. The maximum width of the tornado was 700 yards and the total length of the tornado was 18.2 miles.

The wider storm

A strong cold front moved through region. With plenty of moisture, instability and decent low level shear, severe storms developed along the Interstate 70 corridor in Missouri and Illinois. Numerous reports of large hail and 5 tornadoes occurred with this event. One of the tornadoes was a long track one that moved through the St. Louis metropolitan area with it being rated an EF4, with only a few minor injuries and no deaths. Also, quite a bit of rain fell during this event and caused flash flooding. The flash flooding persisted for several days as additional rounds of heavy rain fell over the same region through the 26th of April.

Began near Baden Baden (38.7418, -89.5435).

Other tornadoes from the same storm system

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

EF4 Madison County EF2 Monroe County EF1 St. Clair County

Source: NOAA Storm Events Database, event 317887. Narratives are written by the National Weather Service forecast office that issued the report.

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