NWS
St. Louis, Missouri

April 27th, 2002 Severe Weather Event
St. Clair County, Illinois

Radar Analysis and Damage Map with Photos:
Photos from
2 SW Shiloh, IL
(Casa Verde Subdivision)
(image loop)
Photos from
Whiteside Elementary and a retired home for priests
(image loop)
Radar Reflectivity
from WSR-88D KLSX
(image loop)
Storm Relative Motion
from WSR-88D KLSX
(image loop)
Damage Map
 
Damage Survey Assessment:
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1100 PM CDT SUN APR 29, 2002

...PRELIMINARY DAMAGE SURVEY SOUTHWEST OF SHILOH IN ST. CLAIR COUNTY ILLINOIS ON SATURDAY EVENING APRIL 27, 2002...

A DETAILED DAMAGE SURVEY WAS CONDUCTED BY PERSONNEL FROM THE NATIONAL WEATHER SERVICE IN ST. LOUIS INVESTIGATING DAMAGE WHICH OCCURRED SATURDAY EVENING JUST SOUTHWEST OF SHILOH ILLINOIS...APRIL 27, 2002. THE DAMAGE WAS PRODUCED BY A TORNADO AND STRAIGHT-LINE WINDS.

AROUND 1035 PM CDT A TORNADO INITIALLY TOUCHED DOWN 2 MILES SOUTHWEST OF SHILOH ILLINOIS AT THE INTERSECTION OF LAS OLAS AND BOCA GRANDE DRIVES, 1/2 MILE WEST OF THE YORKTOWN GOLF CLUB. MINOR TREE DAMAGE WAS OBSERVED AT THIS LOCATION...THUS THE TORNADO WAS RATED (F0).

THE TORNADO THEN TRAVELED NORTHEAST ACROSS RIO VERDE DRIVE. A TOTAL OF 19 HOMES ALONG RIO VERDE DRIVE SUSTAINED SOME DEGREE OF DAMAGE WITH FOUR HOMES SUSTAINING CONSIDERABLE DAMAGE. TWO LARGE BUILDINGS ON THE YORKTOWN GOLF CLUB SUSTAINED DAMAGE...EACH TIME ON THE SOUTH SIDE. A NUMBER OF OBJECTS SHOWED A CONVERGENT DAMAGE PATTERN SUGGESTING THE OCCURRENCE OF A TORNADO. THE TORNADO WAS RATED (F1) AT THIS LOCATION WHILE THE DAMAGE AREA WAS 100 YARDS WIDE. HAIL UP TO ONE INCH IN DIAMETER ALSO OCCURRED OVER THIS AREA.

THE TORNADO CONTINUED NORTHEAST CROSSING THE INTERSECTIONS OF WENDY WAY AND GOALBY AND WENDY WAY AND ANDERSON LANE. A NUMBER OF HOMES SUSTAINED MINOR ROOF DAMAGE OVER THIS AREA WHILE A NUMBER OF TREES WERE TOPPED OR UPROOTED. THE TORNADIC DAMAGE WAS RATED (F0). IMMEDIATELY NORTH OF THIS PART OF THE TORNADO TRACK A NUMBER OF DOWNED TREES SHOWED A DIVERGENT PATTERN SUGGESTING THAT A MICROBURST OCCURRED. THE TORNADO THEN CAUSED MAINLY ROOF DAMAGE AT WHITESIDE ELEMENTARY SCHOOL AND DAMAGE ALONG THE SOUTH SIDE OF A HOME FOR RETIRED PRIESTS. THE WIDTH OF THE TORNADIC DAMAGE TRACK WAS 75 YARDS WIDE. IMMEDIATELY WEST OF THE RETIREMENT HOME AND NORTH OF THE TORNADO TRACK, A NUMBER OF LARGE TREES SHOWED ANOTHER DIVERGENT PATTERN SUGGESTING A SECOND MICROBURST. THE DAMAGE AT THE RETIREMENT PRIEST HOME WAS RATED (F1).

THE TORNADO CONTINUED TO MOVE NORTHEAST CAUSING MINOR TREE DAMAGE NORTHEAST OF THE RETIREMENT HOME AND EAST OF NORTH GREEN MOUNTAIN ROAD. THE TOP 1/3 OF A RADIO TOWER WAS SIGNIFICANTLY DAMAGE. THE TORNADO FINALLY LIFTED ABOUT 0.5 MILES EAST OF THE INTERSECTION OF LEBANON ROAD AND NORTH GREEN MOUNTAIN ROAD.

IN SUMMARY...A TOTAL OF 34 HOMES ALONG THE PATH OF THIS TORNADO SUSTAINED VARYING DEGREES OF DAMAGE. THE TOTAL DAMAGE TRACK OF THE TORNADO WAS 1.75 MILES LONG.

THIS TORNADO IS REFERRED TO AS A 'NON-SUPERCELL TORNADO' WHICH FORMED ALONG THE NORTHERN-FORWARD SIDE OF A SMALL BOWING SEGMENT. THE TORNADO LIKELY HAD A VERY SHORT LIFESPAN OF TWO OR THREE MINUTES.


RON PRZYBYLINSKI
 
Preliminary Storm Reports for April 28th:
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
124 AM CDT SUN APR 28 2002
TIME(CDT)

0805 PM

0805 PM

0806 PM

0809 PM


0832 PM


0950 PM


0950 PM


0955 PM


1024 PM

1040 PM




1042 PM

1046 PM

1050 PM

1110 PM


1140 PM



1140 PM


1146 PM


LOCATION (COUNTY)

NEW BLOOMFIELD MO (CALLAWAY)

NEW BLOOMFIELD MO (CALLAWAY)

FULTON MO (CALLAWAY)

1S FULTON MO (CALLAWAY)


4W NEW FLORENCE MO (MONTGOMERY)


UNION MO (FRANKLIN)


1S UNION MO (FRANKLIN)


PACIFIC MO (FRANKLIN)


ASHLAND MO (BOONE)

3S O'FALLON IL (ST. CLAIR)




MILLSTADT IL (ST. CLAIR)

BELLEVILLE IL (ST. CLAIR)

BELLEVILLE IL (ST. CLAIR)

8S TROY MO (LINCOLN)


CHESTER IL (RANDOLPH)



2NE WOMAC MO (STE GENEVIEVE)


SALEM IL (MARION)


EVENT

1.00 INCH HAIL

WIND DAMAGE

0.75 INCH HAIL

1.75 INCH HAIL


0.75 INCH HAIL


WIND DAMAGE


WIND DAMAGE


WIND DAMAGE


70 MPH WIND GUST

WIND DAMAGE




0.75 INCH HAIL

70 MPH WIND GUST

1.00 INCH HAIL

1.00 INCH HAIL


WIND DAMAGE



TORNADO


WIND DAMAGE


REMARKS

REPORTED BY STORM SPOTTER.

TREES DOWNED. REPORTED BY STORM SPOTTER.

REPORTED BY AMATEUR RADIO OPERATOR.

REPORTED BY CALLAWAY COUNTY SHERIFFS DEPARTMENT.

REPORTED BY MONTGOMERY COUNTY SHERIFFS DEPARTMENT.

NUMEROUS TREES AND POWER LINES DOWNED. REPORTED BY AMATEUR RADIO OPERATOR.

POWER LINES DOWNED. REPORTED BY SEVERE WEATHER SPOTTERS.

POWER LINES DOWNED. REPORTED BY AMATEUR RADIO OPERATOR.

REPORTED BY KCOU ASOS.

NUMEROUS TREES AND POWER LINES DOWNED ON WEST SIDE OF SHILOH. 27 STRUCTURES SUSTAINED VARYING DEGREES OF DAMAGE. REPORTED BY AMATEUR RADIO OPERATOR.

REPORTED BY AMATEUR RADIO OPERATOR.

GUST 71 MPH WIND GUST REPORTED AT SCOTT AFB.

REPORTED BY SEVERE WEATHER SPOTTERS.

REPORTED BY SPOTTER FROM LOCAL TELEVISION STATION.

LARGE TREES LIMBS DOWNED FROM CHESTER TO PERRY. REPORTED BY RANDOLPH COUNTY EMERGENCY MANAGEMENT AGENCY.

TREES DOWNED. REPORTED BY STE GENEVIEVE COUNTY SHERIFFS DEPARTMENT.

NUMEROUS TREES AND POWER LINES DOWNED. COUPLE TREES FELL ON TOP OF HOMES. REPORTED BY SEVERE WEATHER SPOTTERS.

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