Damage Survey’s for Tornadoes on Saturday May 5th

...DAMAGE SURVEYS COMPLETED FOR SATURDAY`S TORNADOES...

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS COMPLETED A SURVEY OF
THE MOST SIGNIFICANT DAMAGE THAT RESULTED FROM THE TORNADOES, 
ESTIMATED AT 20 TO 25, THAT OCCURRED ON SATURDAY, MAY 5 2007...ACROSS
SOUTHEAST SOUTH DAKOTA.

THE SURVEY BEGAN AT THE GAVINS POINT DAM AREA IN YANKTON COUNTY.
THE TORNADO BEGAN AT THE LEWIS AND CLARK RECREATION AREA AND
RESULTED IN CONSIDERABLE TREE DAMAGE...AS WELL AS DAMAGE TO HOMES.
A CAMPER WAS THROWN INTO THE TREES AT THE CAMPGROUND WHICH RESULTED
IN ONE INJURY.  THIS TORNADO TRAVELED NORTH-NORTHWEST AND WAS ON THE
GROUND FOR APPROXIMATELY FOUR MILES. FOR A PERIOD OF TIME THIS
TORNADO WAS JOINED BY A SECOND TORNADO FROM THE SAME STORM.  THESE
TORNADOES HAVE BEEN DETERMINED TO BE AN EF-1 (86-110 MPH) ON THE
ENHANCED FUJITA (EF) SCALE BASED UPON THE DAMAGE TO SOME OF THE
HOMES ALONG HIGHWAY 52.

ANOTHER TORNADO BEGAN SEVEN MILES NORTH AND TWO MILES WEST OF
TYNDALL IN BON HOMME COUNTY.  THIS TORNADO TRAVELED NORTH-NORTHWEST
AND WAS ON THE GROUND FOR SIX MILES.  MANY HOMES...BARNS...VARIOUS
OUT-BUILDINGS...AND TREES WERE SEVERELY DAMAGED.  THE RESULTANT
DAMAGE LED THE WEATHER SERVICE TO GIVE IT AN EF-2 (111-135 MPH)
RATING ON THE EF-SCALE.

THE STRONGEST TORNADO TORNADO OCCURRED IN AURORA COUNTY...
APPROXIMATELY FIVE MILES SOUTHEAST OF PLANKINTON.  THIS TORNADO WAS
ON THE GROUND FOR FIVE MILES AND TRAVELED DUE NORTH.  THE MOST
SIGNIFICANT DAMAGE WAS DONE TO A PHEASANT HUNTING LODGE/PRESERVE...
WHERE NUMEROUS BUILDINGS AND TREES WERE SEVERELY DAMAGED.  AN EMPTY
CAR TRAILER WAS ROLLED A DISTANCE OF 100 YARDS BEFORE COMING TO
REST. BESIDES THE STRUCTURAL DAMAGE...NUMEROUS ADULT AND CHICK
PHEASANTS WERE LOST. THIS TORNADO ALSO CROSSED INTERSTATE 90 BEFORE
DISSIPATING TWO MILES NORTH OF I-90. THE OBSERVED DAMAGE RESULTED IN
THIS TORNADO BEING RATED AN EF-3 WITH ESTIMATED WINDS AROUND 140 MPH.

AN EF-1 (86-110 MPH) TORNADO OCCURRED IN WESTERN HANSON COUNTY ALONG
RIVERSIDE ROAD EAST OF MITCHELL. THIS TORNADO ALSO CROSSED
INTERSTATE 90 AND HIGHWAY 38 ALONG ITS THREE MILE TRACK.  TREES WERE
DAMAGED AND A BUILDING LOST ITS ROOF.

THE FINAL SURVEY WAS CONDUCTED IN SPENCER.  THE TORNADO DEVELOPED
TWO MILES SOUTH OF SPENCER AND TRAVELED THROUGH THE WESTERN HALF
OF SPENCER AND CONTINUED TO THE NORTH-NORTHWEST.  THIS TORNADO WAS
OBSERVED TO BE VERY LARGE BEFORE IT DISSIPATED FOUR MILES NORTHWEST
OF SPENCER.  MOST OF THE DAMAGE WAS TO TREES AND A JUNK YARD.  THIS
TORNADO WAS RATED AN EF-2 (111-135 MPH).

A REMINDER...THE OLD FUJITA SCALE (NAMED AFTER UNIVERSITY OF CHICAGO
THEODORE FUJITA) HAS BEEN REVISED AS OF FEBRUARY 1ST AND IS NOW THE
ENHANCED FUJITA SCALE.  THIS NEW SCALE PROVIDES THE SURVEYORS WITH
MORE DAMAGE INDICATORS WHICH IN TURN PROVIDE A LESS SUBJECTIVE
RATING.

MORE INFORMATION CONCERNING THIS SEVERE WEATHER OUTBREAK...WHICH IS
THE MOST SIGNIFICANT TORNADO OUTBREAK IN SOUTHEAST SOUTH DAKOTA
SINCE JUNE 24 2003...WILL BE ISSUED THROUGHOUT THIS WEEK.  FOR MORE
INFORMATION OR QUESTIONS...PLEASE CONTACT GREG HARMON OR TODD
HEITKAMP.



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