Figure 1: Damage Map
Figure 2: Severe Hail in Mascoutah, Illinois
Figure 3: Shiloh, Illinois Rotating Wall Cloud
Figure 4: Damage to Eagles Landing Subdivision
Figure 5: Damage to Eagles Landing Subdivision
Figure 6: Damage to Eagles Landing Subdivision
Figure 7: EF2 Damage to House
Figure 8: EF2 Damage to House
Figure 9: Radar Reflectivity Image of Tornadic Supercell (5:37 p.m.)
Figure 10: Radar Storm Relative Velocity Image of Tornadic Supercell (5:37 p.m.)

NWS
St. Louis, Missouri

June 8th 2009 EF2 Tornado
St. Clair County, Illinois

Overview:

A survey conducted by the National Weather Service in St. Louis indicated that the first wind damage produced by the storm was near Interstate 64 and Green Mount Road on the southwest side of O'Fallon, Illinois was caused by straight line winds.

The tornado touched down just northeast of the intersection of North Green Mount Road and Lebanon Avenue in the Eagles Landing Subdivision.  From this point the tornado produced a nearly continuous damage path that extended to about 1 mile southeast of the intersection of Highway 4 and Jefferson Road.  It finally lifted as it approached the Kaskaskia River.

The total path length of the tornado is estimated to be 12.8 miles, with an average width of damage of about one-tenth of a mile.  However, straight line winds did cause lesser damage over a wider swath of up to 3 miles.

The greatest damage was to a home located just west of the intersection of Highway 4 and Jefferson Road.  Damage there was rated EF2 on the Enhanced Fujita Scale.  Elsewhere along the path of the tornado, the damage was generally in the EF0-EF1 range.

Click here to see the storm reports for this event (.pdf file).

Damage Map and Photos:

Storm Damage

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Aerial Photographs Provided By Channel 4 (KMOV-TV)

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