May 22 Edmunds County Tornado Rated EF4

Several tornadoes touched down across north central and northeast South Dakota during the late afternoon and evening hours on May 22, 2010.  WFO Aberdeen have completed their damage surveys and filed the following public information statement on the tornadoes.  The strongest tornado was rated EF4 on the Enhanced Fujita Scale.  Details are below.

PUBLIC INFORMATION STATEMENT  ...CORRECTED...
NATIONAL WEATHER SERVICE ABERDEEN SD
137 PM CDT MON MAY 24 2010 /1237 PM MDT MON MAY 24 2010/


...PRELIMINARY DAMAGE SURVEY RESULTS FROM THE MAY 22 TORNADO EVENT...

PRELIMINARY RESULTS FROM NWS STORM SURVEY DAMAGE TEAM ALONG WITH
EYEWITNESS AND MEDIA REPORTS INDICATE THAT A PRELIMINARY TOTAL OF
SEVEN TORNADO TOUCHDOWNS OCCURRED ON 22 MAY 2010.

...WALWORTH COUNTY...

THE FIRST CONFIRMED TOUCHDOWN APPEARS TO HAVE BEEN ROUGHLY 3
MILES SOUTH OF AKASKA. THIS WAS A BRIEF TOUCHDOWN AND NO DAMAGE
WAS REPORTED. THIS IS CONSISTENT WITH AN EF0 TORNADO RATING WITH
WIND SPEEDS FROM 65 TO 85 MPH.

THE NEXT TOUCHDOWN TOOK PLACE ROUGHLY 2 MILES SOUTH OF HIGHWAY 12
ON STATE HIGHWAY 47. THERE WERE 5 TO 7 WOODEN POWER POLES THAT
WERE KNOCKED DOWN. THE TORNADO THEN LIFTED SHORTLY THEREAFTER.
THIS IS CONSISTENT WITH AN EF1 TORNADO RATING WITH WIND SPEEDS
FROM 86 TO 110 MPH.

THE TORNADO RE-FORMED ABOUT 4 MILES WEST OF BOWDLE ON HIGHWAY 12.
THE TORNADO CAME DOWN ON A FARMSTEAD ON THE NORTHSIDE OF THE
ROAD...OR FORMED IMMEDIATELY TO THE SOUTH OF THE FARMSTEAD AND
TRACKED THROUGH THE YARD. SEVERAL OUTBUILDINGS WERE DAMAGED...WITH
THE RESIDENCE SUSTAINING SIDING AND ROOF DAMAGE BUT STILL
HABITABLE. A STOCK TRAILER WAS THROWN ABOUT 75 YARDS FROM ITS
INITIAL POINT. TREE DAMAGE WAS SUSTAINED ON THE WEST SIDE OF THE
PROPERTY...WITH FALLEN TREES LEANING TO THE WEST. ON THE EAST SIDE
OF THE PROPERTY DEBRIS WAS SCATTERED TO THE NORTHEAST. THE TORNADO
CONTINUED MOVING NORTHEAST CROSSING INTO EDMUNDS COUNTY AT THE
INTERSECTION OF 133RD STREET AND 323RD AVE. THE DAMAGE SUSTAINED
AT THE FARMSTEAD IS CONSISTENT WITH AN EF2 TORNADO RATING WITH
WIND SPEEDS FROM 111 TO 135 MPH.

...WEST AND CENTRAL EDMUNDS COUNTY...

THE TORNADO CONTINUED TO TRACK NORTHEAST THROUGH WESTERN EDMUNDS
COUNTY...STRIKING A FARMSTEAD NEAR THE INTERSECTION OF 132ND
STREET AND 323RD AVE. SEVERAL LARGE COTTONWOOD TREES WERE
UPROOTED ALONG WITH DAMAGE TO SEVERAL TRAILERS. 3 GRAIN BINS WERE
DESTROYED WITH DEBRIS LOCATED SEVERAL HUNDRED YARDS TO THE
NORTHEAST. THE RESIDENCE SUFFERED SOME SHINGLE DAMAGE AND ANTENNA
DAMAGE. THE MAIN TORNADO TRACK WAS SOUTH OF THIS LOCATION...AND
DAMAGE AT THIS LOCATION IS CONSISTENT WITH AN EF1 TORNADO RATING
WITH WIND SPEEDS FROM 86 TO 110 MPH.

THE TORNADO TRACKED TO A LOCATION ABOUT 1.5 MILES NORTHWEST OF
BOWDLE. THE RESIDENCE IS LOCATED JUST SOUTH OF THE INTERSECTION
OF 132ND STREET AND 325TH AVENUE. SEVERAL OUTBUILDINGS AT THIS
LOCATION WERE DAMAGED OR DESTROYED...WITH WIDESPREAD TREE DAMAGE
ON THE PROPERTY. THE MAIN HOUSE AT THIS LOCATION SUFFERED NO
DAMAGE. SEVERAL GRAIN CARS WERE ROLLED ABOUT 100 YARDS INTO THE
TREES BEHIND THE HOUSE. DAMAGE AT THIS LOCATION IS CONSISTENT WITH
AN EF3 TORNADO RATING WITH WIND SPEEDS FROM 136 TO 165 MPH.

THE TORNADO CONTINUED TO TRACK NORTHEAST TO A LOCATION ABOUT 1
MILE NORTH OF BOWDLE ON 132ND STREET. THE MAIN LIVING RESIDENCE
SUFFERED MAJOR DAMAGE TO WALLS WITH PART OF THE ROOF STRUCTURE
REMOVED. WIDESPREAD TREE DAMAGE WAS SUSTAINED...WITH MANY OF THE
TREES COMPLETELY DEBARKED WITH ONLY STUMPS OF THE LARGEST
BRANCHES REMAINING. 2 LARGE GARAGES WERE COMPLETELY DESTROYED
WITH THE CONCRETE SLAB WIPED CLEAN. THE VEHICLES IN ONE GARAGE
WERE ROLLED/TOSSED FROM 25 TO 100 YARDS AWAY. IT IS ESTIMATED THAT
ONE VEHICLE FLEW THROUGH THE AIR 75 TO 100 YARDS RESTING IN THE
TREE SHELTER BELT TO THE NORTH OF THE RESIDENCE. SEVERAL OTHER
OUTBUILDINGS WERE COMPLETELY DESTROYED. THE DAMAGE AT THIS
LOCATION IS CONSISTENT WITH AN EF4 TORNADO RATING WITH WIND SPEEDS
FROM 166 TO 200 MPH.

LOCATED JUST NORTH OF THIS RESIDENCE...SEVERAL METAL POWER
TRANSMISSION TOWERS WERE TOPPLED. ONE TOWER WAS SHEARED OFF FROM
THE CONCRETE FOOTINGS AND TRAVELED AN ESTIMATED 400 YARDS AWAY.
THERE WERE 6 TO 8 OF THESE TOWERS TOPPLED. GROUND SCOURING WAS
VISIBLE ALONG THE PATH OF THESE TOWERS. THE DAMAGE TO THE TOWERS
IS CONSISTENT WITH AN EF4 TORNADO RATING WITH WIND SPEEDS FROM
166 TO 200 MPH.

THE TORNADO CONTINUED TO TRACK IN AN EASTERLY
DIRECTION...CROSSING OVER STATE HIGHWAY 47 JUST NORTH OF THE
INTERSECTION WITH 132ND STREET. A STATE RADIO TOWER WAS TOPPLED
AT THIS LOCATION...AND IS CONSISTENT WITH AN EF2 TORNADO RATING
WITH WIND SPEEDS FROM 111 TO 135 MPH. THE TORNADO LIFTED SHORTLY
THEREAFTER.

ANOTHER BRIEF TORNADO TOUCHDOWN OCCURRED 6 MILES WNW OF ROSCOE,
OR ONE-HALF MILE NORTH OF THE INTERSECTION OF HIGHWAY 12 AND
STATE HIGHWAY 253. THERE WAS NO DAMAGE REPORTED WITH THIS BRIEF
TOUCHDOWN...AND IS CONSISTENT WITH AN EF0 TORNADO RATING WITH WIND
SPEEDS FROM 65 TO 85 MPH.

...NORTHEASTERN EDMUNDS COUNTY...

THE INITIAL TORNADO TOUCHDOWN OCCURRED IN NORTHEASTERN EDMUNDS
COUNTY NEAR THE INTERSECTION OF COUNTY ROADS 128TH STREET AND
360TH AVE WHERE SECTIONS OF ROOF WERE REMOVED FROM A BARN. THE
TORNADO THEN TRACKED NORTHEASTWARD THROUGH PRIMARILY CROPLAND AND
PASTURE LAND FOR APPROXIMATELY 6 MILES TO NEAR DEERFIELD COLONY.
SPORADIC TREE DAMAGE ALONG WITH WOODEN POWER POLES SNAPPED OFF
WERE ALSO OBSERVED ALONG THE TORNADO PATH...CONSISTENT WITH AN EF1
TORNADO RATING WITH WIND SPEEDS FROM 86 TO 110 MPH.

..SOUTHEASTERN MCPHERSON COUNTY...

EYEWITNESS REPORTS INDICATE THE INITIAL TORNADO TOUCHDOWN
OCCURRED IN SOUTHEASTERN MCPHERSON COUNTY NEAR THE INTERSECTION
OF COUNTY ROADS 122ND STREET AND 366TH AVE WHERE
BARN...TREE...AND POWER POLE DAMAGE WAS OBSERVED. THE TORNADO
THEN TRACKED EAST/NORTHEASTWARD THROUGH SOUTHEASTERN MCPHERSON
COUNTY TEARING A ROOF OFF A TURKEY BARN...AND CAUSING SPORADIC
TREE AND POWER POLE DAMAGE. PRELIMINARY DAMAGE ESTIMATES ARE
CONSISTENT WITH AN EF1 TORNADO RATING WITH WIND SPEEDS FROM 86 TO
110 MPH.

...NORTHERN BROWN COUNTY...

THIS TORNADO TRACK WAS NOT COMPLETELY SURVEYED. SEVERAL
EYEWITNESS ACCOUNTS INDICATE THAT A TORNADO TOUCHED DOWN
APPROXIMATELY 8 MILES WEST AND 1 MILE SOUTH OF HECLA NEAR THE
INTERSECTION OF 105TH STREET AND 396TH AVE. THIS TORNADO PRODUCED
DAMAGE TO ONE FARMSTEAD INCLUDING TEARING A ROOF OFF AN
OUTBUILDING AND THROWING GRAIN BINS 100 YARDS OR MORE. TREE
DAMAGE WAS ALSO NOTED. PHOTOGRAPHIC EVIDENCE INDICATES AN EF1
TORNADO RATING WITH WIND SPEEDS FROM 86 TO 110 MPH.

THE ABOVE DAMAGE SURVEY AND RATING ASSESSMENTS ARE PRELIMINARY. A
FINAL RATING OF ALL TORNADOES WILL BE ASSIGNED PENDING FINAL DATA
REVIEW.



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