NWS
St. Louis, Missouri

July 4th, 2005 Severe Weather Event
Multi-Cellular Thunderstorms Transition into a Bow Echo
Large Hail, Damaging Winds and Isolated Tornadoes
Affect Portions of Eastern Missouri and Western Illinois

Radar and Analysis:
 
Radar Reflectivity
from WSR-88D KLSX
(image loop)
Storm and Damage Photos from Belleville, IL and Surrounding Areas
(Courtesy of Michael Knox)
(image loop)
Damage Map of Downburst Winds and Isolated Tornadoes Across St. Clair and Clinton County, IL Radar Derived Storm Total Precipitation  
 
Severe Weather Assessment:
A slow moving cold front moved through Eastern Missouri and Western Illinois during the afternoon hours of July 4th into a very humid and warm atmosphere. The frontal zone was unusually strong for this time of year thanks to rain cooled air behind the front in Northeast Missouri, and with moderately unstable air ahead of the front, the front itself acted as a trigger for severe thunderstorm development.

Severe thunderstorm activity originated in Northern Washington and Southeastern Franklin counties in Missouri around 1:30 pm and tracked east northeastward through Jefferson County and the Southern St Louis Metropolitan area between 2:00 and 3:00 pm.

The storms moved into Southern Illinois through Monroe, St Clair and Clinton counties between 2:30 and 4:00 pm before weakening. Storms initially were multi-cellular in structure with large hail being the primary threat. With time, however, they merged and turned into a bowed structure with increasing damaging wind threat as they mainly passed south of St. Louis City and into Illinois.

Several small, but tight, circulations were noted along the leading edge of the bow echo with a tornado touchdown occurring just southeast of Scott Air Force Base. Wind damage was widespread across St. Clair and Clinton counties in Illinois. Some minor flooding also occurred in St. Clair county.
 
Damage Assessment:
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
500 PM CDT TUE JUL 5 2005

...PRELIMINARY DAMAGE SURVEY ACROSS PARTS OF ST. CLAIR AND CLINTON COUNTIES IN SOUTHWEST ILLINOIS ON MONDAY AFTERNOON JULY 4, 2005...

A DETAILED DAMAGE SURVEY WAS CONDUCTED BY PERSONNEL FROM THE NATIONAL WEATHER SERVICE IN ST. LOUIS INVESTIGATING DAMAGE WHICH OCCURRED MONDAY AFTERNOON ACROSS PARTS OF EASTERN ST. CLAIR AND WESTERN CLINTON COUNTIES IN SOUTHWEST ILLINOIS.

BETWEEN 245 PM AND 320 PM SEVERAL SWATHS OF INTENSE DOWNBURST WINDS DAMAGED NUMEROUS CORN FIELDS FROM THE INTERSECTION OF ILLINOIS HIGHWAY 13 AND NORTH GREEN MOUNTAIN ROAD (APPROXIMATELY 2 MILES SOUTHEAST OF BELLEVILLE) TO ALBERS ILLINOIS IN CLINTON COUNTY. SEVERAL CORN FIELDS WERE FLATTENED WITHIN THIS AREA. THE DAMAGE AREA WAS APPROXIMATELY 8 MILES IN LENGTH AND 2 TO 2.5 MILES WIDE.

AT APPROXIMATELY 320 PM CDT A TORNADO TOUCHED DOWN FROM THE FAR WEST SIDE OF ALBERS THROUGH THE NORTH SIDE OF TOWN. NUMEROUS LARGE TREES WERE SEVERELY DAMAGED FROM 0.25 MILES WEST OF THE INTERSECTION OF  JAYCEE DRIVE AND DWIGHT STREETS THROUGH ALBERS JAYCEE PARK. DAMAGE WAS RATED F1 OVER THIS AREA. THE TORNADO TRAVELED NORTHEAST AND CAUSED ADDITIONAL TREE DAMAGE AT ANOTHER PARK EAST OF THE INTERSECTION OF NORTH FRANKLIN AND APPLE DRIVE OVER THE NORTHERN PART OF TOWN. A FEW HOMES EAST OF THE PARK SUSTAINED MINOR SIDING AND WINDOW DAMAGE. DAMAGE WAS RATED F0 OVER THIS AREA. TOTAL DAMAGE PATH OF THE TORNADO WAS 0.75 MILE WHILE THE WIDTH OF THE DAMAGE PATH WAS APPROXIMATELY 30 TO 50 YARDS WIDE.

PRZYBYLINSKI/TILLY
 
Preliminary Storm Reports for July 4th:
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO
502 PM CDT MON JUL 04 2005
TIME (DATE)

0205 PM (07/04/2005)

0215 PM (07/04/2005)

0300 PM (07/04/2005)


0304 PM (07/04/2005)

0335 PM (07/04/2005)

0340 PM (07/04/2005)

0345 PM (07/04/2005)

LOCATION (COUNTY)

HOUSE SPRINGS (JEFFERSON MO)

1 N ARNOLD (JEFFERSON MO)

2 E BELLEVILLE (ST. CLAIR IL)


1 NE BELLEVILLE (ST. CLAIR IL)

BREESE (CLINTON IL)

GERMANTOWN (CLINTON IL)

BELLEVILLE (ST. CLAIR IL)

EVENT

TSTM WND DMG

0.75 INCH HAIL

TSTM WND DMG


TORNADO

TSTM WND DMG

1.00 INCH HAIL

TSTM WND DMG

REMARKS

12 INCH DIAMETER TREE DOWN

REPORTED BY TRAINED SPOTTER

2 FT DIAMETER TREE SNAPPED OFF 20 FT ABOVE GROUND

TORNADO REPORTED 3 MILES SE OF SCOTT AFB

TREES AND POWER LINES DOWN

REPORTED BY AMATEUR RADIO

NUMEROUS 10 INCH LIMBS AND POWER LINES DOWN IN BELLEVILLE, MASCOUTA AND FREEBURG

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