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PUBLIC INFORMATION STATEMENT...
NATIONAL WEATHER SERVICE ST LOUIS MO
630 PM CDT SUN JULY 23 2006

...PRELIMINARY DAMAGE SURVEY FOR THE JULY 21 2006 WIDESPREAD WIND
DAMAGE EVENT AND TORNADOES OVER PARTS OF SOUTHWEST ILLINOIS...

PERSONNEL FROM THE NATIONAL WEATHER SERVICE OFFICE IN ST. LOUIS
SURVEYED DAMAGE OVER PARTS OF MADISON..CLINTON..ST. CLAIR AND
WASHINGTON COUNTIES IN SOUTHWEST ILLINOIS FROM FRIDAY`S SEVERE
STORM EVENT.

DAMAGE TO TREES...POWERLINES...SILOS...FARM SHEDS AND OTHER
OUTBUILDINGS FROM THE FRIDAY MORNING SEVERE STORM EVENT WAS DUE TO A
COMBINATION OF STRAIGHT-LINE WINDS (DOWNBURSTS - LOCALLY STRONG
MICROBURSTS) AND WEAK TORNADOES.

IN MADISON COUNTY...
THE FIRST OF THREE TORNADIC DAMAGE TRACKS STARTED APPROXIMATELY 200
YARDS SOUTH OF THE INTERSECTION OF EAST KIRSCH ROAD AND BLACKJACK
ROAD OR 2.5 MILES SOUTH-SOUTHEAST OF TROY ILLINOIS. A MACHINE SHED
WAS TOTALLY DESTROYED AT THIS LOCATION. THE TORNADO RAPIDLY MOVED
SOUTH-SOUTHEAST AND CROSSED ILLINOIS HIGHWAY 4 NEAR LILAC ROAD OR 3
MILES SOUTHWEST OF ST. JACOB ILLINOIS. A FARM HOME WAS SUSTAINED
SEVERE DAMAGE FROM A LARGE FALLEN TREE NEAR LILAC ROAD WHILE TWO
MACHINE SHEDS SUSTAINED MINOR DAMAGE. MANY TREE TOPS ALONG THE TRACK
OF THIS TORNADO WERE SEVERED AT THE TOP. THE LENGHT OF THE TORNADIC
DAMAGE TRACK WAS 4 MILES AND HAD A WIDTH OF 40-50 YARDS. THE DAMAGE
WAS RATED F0 ON THE FUJITA SCALE WITH ESTIMATED WINDS OF 70 TO 80
MPH. THE INITIAL TORNADO TOUCHDOWN OCCURRED AT APPROXIMATELY AT 1137
AM CDT.

A SECOND TORNADO FORMED ABOUT A MINUTE LATER (1138 AM CDT) AND SOUTH
OF THE FIRST TRACK NEAR THE INTERSECTION OF BLACKJACK AND LEBANON
ROADS OR 4 MILES SOUTH SOUTHEAST OF TROY. THE SECOND TORNADO TRACK
TRAVELED NEARLY EASTWARD AND ENDED NEAR THE INTERSECTION OF ROSE AND
SUMMERFIELD ROADS OR 4 MILES SOUTH OF ST. JACOB IN EXTREME SOUTHEAST
MADISON COUNTY. ONE FARMSTEAD SUSTAINED MINOR MACHINE SHED DAMAGE
WHILE SEVERAL POWER POLES WERE DOWN EAST OF HIGHWAY 4. NUMEROUS
LARGE TREES WERE SEVERED NEAR THE TOP ALONG THIS TRACK. THE LENGHT
OF THE DAMAGE TRACK WAS 5.5 MILES IN LENGTH AND 40 TO 50 YARDS WIDE.
THE DAMAGE WAS RATED F0.

BETWEEN THE TORANDO TRACKS AND LEBANON ILLINOIS DAMAGING DOWNBURST
WINDS DOWNED TREES AND SEVERAL HUNDRED ACRES OF CORN. THE WIDTH OF
THE DOWNBURSTS WAS APPROXIMATELY 5 MILES. WIND SPEEDS WERE ESTIMATED
BETWEEN 60 TO 75 MPH.

ST.CLAIR AND CLINTON COUNTIES...
A THIRD TORNADIC DAMAGE TRACK WAS UNCOVERED APPROXIMATELY 1/2 MILE
NORTH OF U.S. 50 AND SUMMERFIELD ROAD AND EXTENDED NEARLY EASTWARD
TO THE SOUTH SIDE OF TRENTON ILLINOIS IN CLINTON COUNTY. THE DAMAGE
TRACK WAS INTERMITTEN WITH TREE TOPS SEVERED AT MANY LOCATIONS ALONG
THIS TRACK. TWO SMALL GRAIN SILOS WERE DESTROYED OVER THE SOUTHEAST
PART OF TRENTON BY THE TORNADO WHILE LARGE TREES DAMAGED SEVERAL
HOMES ALONG THE SOUTHERN PART OF TOWN. THE LENGHT OF THE THIRD TORNADO
TRACK WAS 6.0 MILES WHILE THE DAMAGE WIDTH RANGED BETWEEN 40 TO 60
YARDS. THE TORNADO INITIALLY TOUCHED DOWN AT APPROXIMATELY 1142 AM
CDT AND CROSSED THE ST. CLAIR - CLINTON COUNTY LINE AT APPROXIMATELY
1145 AM CDT. THE DAMAGE INTENSITY WAS RATED F0. SEVERAL LARGE TREES
WERE DOWN IN THE TOWN OF SUMMERFIELD DUE TO DOWNBURST WINDS. SOME OF
THE TREES DAMAGED TWO HOMES. A SILO AND TWO MACHINE SHEDS AND A HOME
ON A FARMSTEAD SUSTAINED DAMAGE 1.5 MILES SOUTHEAST OF TRENTON.

BETWEEN TRENTON AND NEW BADEN AND EAST TO ALBERS LARGE LIMBS OR
TREES WERE DOWN WHILE HUNDREDS OF ACRES OF CORN WERE DAMAGED. STRONG
MICROBURSTS EMBEDDED WITHIN THE DOWNBURST SWATH FLATTENED CORN AT
SEVERAL LOCATIONS BETWEEN TRENTON AND GERMANTOWN. ONE MACHINE SHED
WAS DAMAGED NEAR THE INTERSECTION OF AVISTON AND HIGHLINE ROADS
WHILE A SECOND MACHINE SHED WAS DAMAGED 3 MILES WEST OF GERMANTOWN.
WITNESES SOUTH OF TRENTON EXPERIENCED 1 INCH DIAMETER HAIL WITH THE
HIGH WINDS. THE HAIL COMBINED WITH THE WIND DAMAGED WINDOWS AND
SIDING AT SEVERAL FARMSTEADS.

A FOURTH TORNADO FORMED APPROXIMATELY 1.5 MILES WEST OF GERMANTOWN
AND TOTALLY DESTROYED A LARGE POULTRY BUILDING AND DAMAGED TWO OTHER
BUILDINGS. DEBRIS FROM THE POULTRY BUILDING WAS TOSSED 1/2 MILE TO
THE EAST. THE TORNADO TOPPED SEVERAL TREES OVER GERMANTOWN. THE
LENGTH OF THIS TORNADO TRACK WAS APPROXIMATELY 2.5 MILES WHILE THE
DAMAGE WIDTH RANGED FROM 40 TO 60 YARDS. THE TORNADO INITALLY
TOUCHDOWN AT APPROXIMATELY 1155 AM CDT AND WAS RATED F1 INTENSITY.
DOWNBURST WINDS DAMAGED TREES AND CORN SOUTH OF A LINE FROM
GERMANTOWN TO BARTELSO TO THE CLINTON COUNTY LINE. AGAIN STRONG
MICROBURSTS EMBEDDED WITHIN THE DOWNBURST SWATHS FLATTEN CORN IN THE
FLOOD PLAIN NORTH OF THE KASKASKIA RIVER.

WASHINGTON COUNTY...

AGAIN TREES..LARGE LIMBS AND CORN WAS DAMAGED BETWEEN THE KASKASKIA
RIVER AND NEW MIDEN ILLINOIS. CORN WAS FLATTEN MAINLY NORTH OF NEW
MIDEN. A FIFTH TORNADO INITIALY TOUCHED DOWN AT APPROXIMATELY 1205
PM CDT 1/4 MILE NORTH OF NEW MIDEN TO 1.5 MILES EAST SOUTHEAST OF
HOYLETON ILLINOIS IN NORTHEAST WASHINGTON COUNTY. SILOS AND LARGE
MACHINE SHEDS WERE DAMAGED 1 MILE EAST OF NEW MIDEN...AND AT SEVERAL
LOCATIONS EAST SOUTHEAST OF HOYLETON. THE LENGHT OF THIS TORNADO
TRACK WAS 7 MILES WHILE THE DAMAGE WIDTH RANGED FROM 40 TO 100
YARDS. THE TORNADO INITIALLY TOUCHDOWN DOWN AT APPROXIMATELY 1207 PM
CDT AND WAS RATED F0 INTENSITY. SOUTH OF THIS TORNADO TRACK TO INTERSTATE 64
DOWNBURST WINDS DAMAGED TREES AND CORN FIELDS.

THE STORM SYSTEM THAT CAUSED DAMAGE LATE FRIDAY MORNING THROUGH THE
EARLY AFTERNOON HOURS IS COINED AS A BOW ECHO STORM. NON-SUPERCELL
TORNADOES OCCURRED FROM NEAR THE APEX TO THE NORTHERN PART OR THE
BOW WHILE SWATHS OF DOWNBURST WINDS OCCURRED ALONG THE BOW. WINDS
WERE ESTIMATED UP TO 90 MPH OVER PARTS OF CLINTON COUNTY AND 70 TO
80 MPH OVER WASHINGTON COUNTY.


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