Figure 1: Damage map of the August 24th, 2007 damaging wind event over St. Louis County.
Figure 2: Tree blown onto a car in the area from just east of downtown Kirkwood through Oakland and east of Interstate 44.
Figure 3: House damaged by fallen tree in the area from just east of downtown Kirkwood through Oakland and east of Interstate 44.
Figure 4: Car damaged by fallen tree in the area from just east of downtown Kirkwood through Oakland and east of Interstate 44.
Figure 5: Apartment building damaged by fallen tree in the area from just east of downtown Kirkwood through Oakland and east of Interstate 44.
Figure 6: Trees down on a road in the area from just east of downtown Kirkwood through Oakland and east of Interstate 44.
Figure 7: House damaged by fallen tree in the area from just east of downtown Kirkwood through Oakland and east of Interstate 44.
Figure 8: Tree blown down in the area from just east of downtown Kirkwood through Oakland and east of Interstate 44.
Figure 9: House damaged by fallen trees in the area from just east of downtown Kirkwood through Oakland and east of Interstate 44.
Figure 10: Image shows how intense thunderstorm winds descend to the surface with time (descending mircoburst). (Courtesy Fujita 1977)
Figure 11: Radar reflectivity image for 3:02 PM CDT showing the Kirkwood and New Baden severe storms. Outflow boundaries signify the storm's leading edge of cool gusty winds.
Figure 12: Doppler velocity data for 3:03 PM CDT. Note the local high wind speeds with each storm.
Figure 13: Reflectivity image for 3:12 PM CDT.
Figure 14: Doppler velocity image for 3:13 PM CDT.
Figure 15: Damage map of microburst over southern Crawford County on August 24th, 2007.
Figure 16: Damage map of microburst over Clinton County on August 24th, 2007.
Figure 17: Damage to the roof of a machine shed in Clinton County Illinois.
Figure 18: Corn crop damage in a field in Clinton County Illinois.

NWS
St. Louis, Missouri

Damaging Wind Event -
St. Louis County, Crawford County and Parts of Southwest Illinois
August 24th, 2007

A severe thunderstorm moved across parts of southwest through southern St. Louis County during the afternoon hours of August 24th, 2007, producing damaging downburst winds (including microbursts) over this region. Some of the hardest hit areas extended from just east of the downtown Kirkwood area through Oakland and areas eastward to Shrewsbury, Missouri. The damage east of Kirkwood occurred just after 3:00 PM CDT. Some trees and numerous large tree limbs damaged homes and vehicles over this area. Note the damage map outlines some of the areas hardest hit by the damaging winds. Surface winds were estimated between 65 to 75 mph.

Additional microburst damage was found west to southwest of Davisville, Missouri (southern Crawford County).  Medium to large tree limbs fell in this area.  The damage over southern Crawford County occurred at approximately 4:40 PM CDT.  In Illinois over west-central Clinton County, roofs from two machine sheds were partially uplifted.  Medium size tree limbs were down while a few large trees were uprooted.  Corn was partially to completely flattened over several farm fields.  The wind damage over Clinton County began at approximately 3:15 to 3:20 PM CDT.

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

Damage Map of wind event over St. Louis County August 24th, 2007
Tree on a car
House damaged by fallen tree

Car damaged by fallen tree

Apartment building damaged by fallen tree

Trees down on a street

House damaged by fallen tree

Tree blown down

House damaged by fallen trees

Microburst depiction

Reflectivity image at 302 pm CDT

Velocity image at 303 pm CDT

Reflectivity image at 312 pm CDT

Velocity image at 313 pm CDT

Damage map for microburst over Crawford County

Damage map for microburst over Clinton County

Roof damage to machine shed

Corn crop damage

 

 


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