National Weather Service damage survey report - KMOV.com

National Weather Service damage survey report

(KMOV.com) -- The National Weather has completed its initial damage survey report, and the results create a dramatic picture of a short amount of time that for some residents destroyed a life's work.

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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1208 AM CDT SUN APR 24 2011

...TORNADO SURVEY OF ST. LOUIS AND MADISON COUNTIES...

DURING THE EVENING OF FRIDAY APRIL 22...AN INTENSE SUPERCELL
THUNDERSTORM PRODUCED A LONG-TRACK TORNADO WHICH TORE A PATH OF
DESTRUCTION FROM WEST TO EAST ACROSS THE ST. LOUIS METROPOLITAN
AREA. THE TORNADO REACHED A MAXIMUM INTENSITY OF EF4 ON THE
ENHANCED FUJITA SCALE AS IT TRACKED THROUGH THE COMMUNITY OF
BRIDGETON...JUST WEST OF LAMBERT ST. LOUIS INTERNATIONAL AIRPORT.
THE TOTAL PATH LENGTH WAS 22 MILES...WITH A WIDTH OF UP TO 0.4
MILES.

THE TORNADO INITIALLY TOUCHED DOWN ALONG THE NORTHERN EDGE OF CREVE
COEUR LAKE AT APPROXIMATELY 755 PM.  IT TRACKED NEARLY DUE EAST AT
ABOUT 40 MPH...AND INTENSIFIED AS IT ENTERED MARYLAND HEIGHTS. THERE
IT PRODUCED UP TO EF3 DAMAGE TO MANY HOMES AND BUSINESSES WITH A
DAMAGE SWATH OF 200 TO 400 YARDS WIDE.  DAMAGED CONTINUED EASTWARD
IN AN UNBROKEN TRACK...CROSSING I-270 ABOUT 1 MILE SOUTH OF I-70.
THE TORNADO REACHED PEAK INTENSITY OF EF4 AS IT DEVASTATED THE
COMMUNITY OF BRIDGTON ALONG OLD ST. CHARLES ROCK ROAD.  FROM
THERE...THE TORNADO PARALLELED INTERSTATE 70 THROUGH THE COMMUNITY
OF ST. ANN...THEN TOOK AIM DIRECTLY ON LAMBERT ST. LOUIS
INTERNATIONAL AIRPORT.  MANY OF THE LARGE WINDOWS IN THE MAIN
TERMINAL BUILDING WERE BLOWN OUT OR DAMAGED BY FLYING DEBRIS...AND A
LARGE SECTION OF ROOF WAS PEELED FROM CONCOURSE C.  ALTHOUGH THE
VAST MAJORITY OF PEOPLE WERE EVACUATED TO LOWER LEVELS AND TO
INTERIOR ROOMS BEFORE THE TORNADO HIT...5 PEOPLE WERE TREATED AND
RELEASED FROM AREA HOSPITALS FOR INJURIES DUE TO FLYING DEBRIS. THE
AIRPORT WAS CLOSED DUE TO THE EXTENSIVE DAMAGE.

THE TORNADO EXITED LAMBERT ST. LOUIS INTERNATIONAL AIRPORT CROSSING
NEAR THE MCDONNELL BOULEVARD/HARMON LANE INTERSECTION.  IT THEN
MOVED INTO BERKELEY WHERE IT CROSSED INTERSTATE 170 BETWEEN AIRPORT
ROAD AND SCUDDER AVENUE. EXTENSIVE DAMAGE WAS NOTED ALONG FOURTH
AVENUE...ESPECIALLY AT THE GARFIELD AVENUE AND HANCOCK AVENUE
INTERSECTIONS WHERE A VACANT HOUSE AND SEVERAL HOMES LOST THEIR
ENTIRE ROOF STRUCTURE.  THE GREATEST DAMAGE IN THIS NEIGHBORHOOD WAS
RATED EF-2.  THE TORNADO CONTINUED TO THE NORTHEAST THROUGH
NEIGHBORHOODS SOUTH OF AIRPORT ROAD PRODUCING SIGNIFICANT TREE
DAMAGE INCLUDING MANY LARGE TREES FALLING ON HOMES.  THE TORNADO
THEN CROSSED AIRPORT ROAD NEAR ABSTON AVENUE.  THE TORNADO CROSSED
NORTH FLORISSANT ROAD WHERE IT CAUSED EXTENSIVE ROOF DAMAGE TO THE
NEWER MATERIALS BUILDING AND THE FIRST BAPTIST CHURCH OF FERGUSON.
ACROSS THE ROAD...A LITTLE CAESARS RESTAURANT LOST IT ENTIRE ROOF.
DAMAGE TO THESE STRUCTURES WAS RATED EF-1. THE TORNADO THEN
CONTINUED THROUGH NEIGHBORHOODS ALONG AND JUST THE NORTH OF HEREFORD
AVENUE/CHAMBERS ROAD WHERE IT CONTINUED TO CAUSE EXTENSIVE TREE
DAMAGE AS WELL AS SOME ADDITIONAL PARTIAL ROOF DAMAGE TO HOMES ALONG
IT PATH TO WEST FLORISSANT ROAD.  ALSO ALONG THIS PART OF ITS
PATH...IT PARTIALLY REMOVED THE ROOF AT THE GRIFFITH ELEMENTARY
SCHOOL WHICH WAS RATED AS EF-1. THIS IS ALSO WHERE THE TORNADO
WIDENED TO ONE QUARTER OF A MILE WITH DAMAGE NOTED TO TREES AND SOME
HOMES ON BOTH SIDES OF CHAMBERS ROAD.  ALONG THE ENTIRE PATH FROM
BERKELEY TO DELLWOOD...DAMAGE VARIED IN INTENSITY FROM EF-1 TO LOW
END EF-2 WITH A MAXIMUM ESTIMATED WIND SPEED OF 120 MPH...AND
INCLUDED NUMEROUS SNAPPED POWER POLES IN ADDITION TO THE EXTENSIVE
NUMBER OF SNAPPED AND DOWNED TREES.

THE TORNADIC DAMAGE CONTINUED SOUTHEAST OF THE INTERSECTION OF
CHAMBERS AND FLORISSANT ROADS AND TRAVELED EASTWARD SOUTH OF
CHAMBERS ROAD...CROSSING THE MISSISSIPPI RIVER APPROXIMATELY 2 MILES
SOUTH OF INTERSTATE 270. THE MAJORITY OF THE DAMAGE WAS RATED EF1
DUE TO FALLEN TREES. SOME OF THESE TREES FELL ON HOMES WHILE A FEW
OTHERS FELL THROUGH HOMES CAUSING DAMAGE NOT DIRECTLY RELATING TO
THE INTENSITY OF THE WIND WITHIN THE TORNADO.

EF2 DAMAGE WAS UNCOVERED AT THREE DIFFERENT LOCATIONS EAST OF
DELLWOOD. ONE AREA WAS LOCATED ONE QUARTER MILE SOUTH OF CHAMBERS
ROAD ON HALLS FERRY ROAD WHERE FOUR LARGE UTILITY POLES WERE
SNAPPED. THE SECOND AREA OF EF2 DAMAGE WAS LOCATED 0.25 MILE SOUTH
OF CHAMBERS ROAD ALONG BELLEFONTAINE ROAD WHERE SIGNIFICANT TREE
DAMAGE OCCURRED. THE LAST AREA OF DAMAGE WAS LOCATED IN
BELLEFONTAINE NEIGHBORS JUST SOUTH OF CHAMBERS ROAD ON RA ROUX
COURT. ROOFS WERE REMOVED FROM THREE HOMES AT THIS LOCATION WHILE
OTHER HOMES SUSTAINED VARYING DEGREES OF DAMAGE.

THE WIDTH OF THE DAMAGE AREA VARIES FROM 100 YARDS TO 0.4 MILE WITH
THE WIDEST AREA OF DAMAGE WEST OF HALLS FERRY AND SOUTH OF CHAMBERS
ROAD.

THE TORNADO ENTERED ILLINOIS ABOUT 1.5 MILES SOUTH OF THE CHAIN OF
ROCKS BRIDGE. THE TORNADO CONTINUED EAST TO 0.5 MILE NORTH OF THE
INTERSECTION OF HIGHWAY 203 AND PONTOON ROAD. DAMAGE EAST OF THIS
INTERSECTION INCLUDED UPROOTED AND SNAPPED TREES AND THREE HOMES HAD
ROOFS REMOVED. AT LEAST ONE HUNDRED HOMES WERE DAMAGED IN THE AREA.
THE MAXIMUM DAMAGE FOUND WAS IN A NEIGHBORHOOD ALONG BERN AND DAWN
STREETS. THE TORNADIC DAMAGE THEN CURVED SOUTHEAST AND ENDED NEAR
THE INTERSECTION OF ALTON STREET AND PONTOON ROAD.

DAMAGE WIDTH OVER THIS AREA VARIED FROM 50 TO 150 YARDS. THE DAMAGE
EAST OF HIGHWAY 203 WAS RATED LOW-END EF2. THE HIGHEST WIND SPEEDS
ASSOCIATED WITH THE EF2 DAMAGE WERE APPROXIMATELY 120 MPH.


 

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