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EF0 tornado in Morgan County, Illinois

Tornado October 11, 2021 · Morgan County, Illinois

EF0
Rating
1.4 mi
Path length
50 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 50 yards (0.03 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 tornado touched down in an open field 0.5 miles northwest of Alexander at 3:26 PM CDT. The tornado tracked northeastward damaging several large trees before crossing I-72 near mile marker 76, where it blew over a semi truck. It continued northeastward damaging additional large trees before dissipating about 2 miles northwest of Alexander near Highway 123 at 3:28 PM CDT.

The wider storm

Low pressure lifting northward through the Illinois River Valley triggered a line of strong to severe thunderstorms during the afternoon and early evening of October 11th. With the low in close proximity, ample environmental wind shear led to numerous circulations developing within the line of convection. Four weak tornadoes touched down as the storms passed, causing minor damage across portions of Morgan and Woodford counties. In addition, isolated cells ahead of the main line produced wind damage. In particular, widespread damage was reported across Olney in Richland County, likely due to downburst winds in excess of 70mph.

Began near Alexander (39.7290, -90.0530).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 988064. Narratives are written by the National Weather Service forecast office that issued the report.

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