Figure 1: Map of Tornado Damage Tracks and swaths of downburst winds over parts of northeast Missouri and west central Illinois May 24th, 2001. Solid black lines and tornado symbol represent tornadic damage paths. The Fujita (F) scale is used to measure damage intensity.
Figure 2: Detailed map of the Barkley, Missouri tornadic damage track and swath of downburst/microburst winds over Marion county Missouri - May 24th, 2004. The damage was caused by a HP supercell evolving into a bow echo storm.
Figure 3: Detailed map of the Pike County Illinois tornadic tracks and swaths of damaging downburst winds. A nearly continuous swath of damage was observed between Rockport and Detroit, Illinois in Pike County. A strong mesovortex associated with a bow echo traveled along and parallel to the swath of tornadic and wind damage across central Pike county Illinois. The first tornado occurred at approximately 1100 PM CDT...the second tornado occurred at approximately 1107 PM CDT and the third tornado between Pittsfield and Detroit occurred at approximately 1115 PM CDT.
Figure 4: Tree damage over the southern part of Palmyra, Missouri in Marion county. Much of the tree damage associated with the downburst winds occurred over the southern and eastern parts of the city. Tree damage from the downburst winds was observed as far as 1.5 miles south of Palmyra, Missouri.
Figure 5: A weak tornado (F0 intensity) caused these pine trees to be severed above the base of the trunk. The tornado track occurred south of and paralleled U.S Highway 61 northwest of Hannibal, Missouri. Viewing southeast from U.S. Highway 61. The overall tornadic damage track was 2.0 miles long and approximately 40 to 50 yards wide.
Figure 6: Remains of the upper and middle parts of the pine trees were tossed 100 to 200 yards to the east of their original location. Viewing south from U.S. Highway 61.
Figure 7: Tree damage near the end of the tornado track - north of the Hannibal Municipal Airport and south of U.S. Highway 61.
Figure 8: Plan view reflectivity image from WFO KLSX (St. Louis) shows a bow echo moving across Marion county Missouri. The bow shape echo is a frequent indicator for damaging winds. This image was taken at 948 PM CDT.
Figure 9: The storm-relative velocity image was taken at 948 PM CDT. The mesovortex shown near the southern flank of the storm deepened as it moves towards the city of Palmyra. This circulation was responsible for the wind damage over the southern and eastern parts of Palmyra and adjacent areas to the south and southwest. The Barkley, Missouri tornado was not associated with the mesovortex. Rather, this tornado (referred to as a non-supercell tornado) appeared to occur along the leading southern flank of the bow echo.
Figure 10: Corn in a field west of Highway 96, 3 miles north of Rockport, IL (Pike County) is partially flattened from a weak tornado. The corn field is located in the flood plain between Highway 96 and the Mississippi River.
Figure 11: Several trees located east of Highway 96 and 3 miles north of Rockport were severed. Damage was caused by a weak tornado. Viewing northeast.
Figure 12: Several large trees were blown down by an isolated microburst in the town of Atlas, Illinois near the intersection of Highway 96 and U.S. Highway 54. Viewing north.
Figure 13: Several large trees were severed by a second tornado 1.5 miles south of New Hartford Illinois. Viewing east-northeast. Several large branches and trees were down by downburst winds within the community of New Hartford. The length of this tornado damage track was 5 miles and damage width was 40 to 50 yards wide.
Figure 14: Several large trees and tree limbs were downed by a larger swath of downburst winds. This image was taken near the south side of Pittsfield, Illinois in Pike county.
Figure 15: Additional tree damage was noted over the eastern sections of Pittsfield along Highways 100 and 106. Several trees and large limbs fell on homes and vehicles in town.
Figure 16: Tree damage due to a third tornado (Sunny Hill tornado) 1 mile north of Highway 100/106 and 3 miles east-northeast of Pittsfield. This tornado track had a path length of 3 miles while damage width was 50 yards.
Figure 17: This garage was destroyed by damaging winds in the small community of Detroit, Illinois. Viewing east-northeast.
Figure 18: Plan view reflectivity image from WFO KLSX (St. Louis) reveals a large bow echo moving across parts of west-central Illinois and east-central Missouri. Bow Echoes are frequently associated with swaths of damage downbursts winds and weak tornadoes. This image was taken at 1112 PM CDT.
Figure 19: Storm-relative velocity image showing two mesovortices near and north of the apex of the bow and a larger mesovortex near the northern end of the bow echo. Damaging winds occurred with the larger mesovortex over northwest Pike county Illinois while swaths of damaging downbursts and weak tornadoes occurred with the two circulations near and north of the apex of the bow echo.

NWS
St. Louis, Missouri

Severe Storm Event over Northeast Missouri - West Central Illinois
May 24th, 2004

During the evening of May 24th, 2004, a HP (High Precipitation) supercell over northeast Missouri evolved into a bow echo storm as it moved east. Numerous reports of damage were received over Marion county Missouri before crossing the Mississippi River into Illinois. Additional reports of damage were received in Pike county Illinois. Damage surveys were conducted and one tornado occurred in Marion county...just east of Barkley, MO and three tornadoes occurred in Pike county Illinois near Rockport, New Hartford and Sunny Hill.  Also, several swaths of damaging downburst winds were discovered during the surveys.

Regional Map of Tornado Tracks May 24th, 2004
Map of Tornado Damage Track near Barkley MO May 24th, 2004
Map of Tornado Damage Tracks in Pike county IL May 24th, 2004

Tree damage in Palmyra MO May 24th, 2004

Tree damage near Barkley MO May 24th, 2004

Tree damage near Barkley MO May 24th, 2004

Tree damage near Barkley MO May 24th, 2004

Radar Image from 948 PM CDT on May 24th, 2004

Storm Relative Motion Image from 948 PM CDT on May 24th, 2004

Corn Field damage near Rockport, IL May 24th, 2004

Tree damage near Rockport, IL May 24th, 2004

Tree damage in Atlas, IL May 24th, 2004

Tree damage near New Hartford, IL May 24th, 2004

Tree damage near Pittsfield, IL May 24th, 2004

Tree damage near Pittsfield, IL May 24th, 2004

Tree damage near Sunny Hill, IL May 24th, 2004

Garage Destroyed in Detroit, IL May 24th, 2004

Radar Image from 112 PM CDT on May 24th, 2004

Storm Relative Motion Image from 1112 PM CDT on May 24th, 2004

 


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