Three Tornadoes Confirmed as EF4

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GRAND FORKS ND
150 PM CDT SUN JUN 20 2010

...THREE TORNADOES CONFIRMED AS EF4...

THE NATIONAL WEATHER SERVICE HAS RATED THREE OF THE TORNADOES WHICH
OCCURRED ON JUNE 17TH AS EF4...ON THE ENHANCED FUJITA SCALE. THE EF4
DAMAGE OCCURRED WITH TORNADOES IN GRAND FORKS COUNTY ND...OTTER TAIL
COUNTY MN...AND WADENA COUNTY MN.

INITIAL DAMAGE TEAM ASSESSMENTS WERE PERFORMED ON FRIDAY...JUNE
18TH...WHICH SUGGESTED THE POSSIBILITY FOR GREATER THAN EF3 DAMAGE.
A NATIONAL WEATHER SERVICE QUICK RESPONSE TEAM REPRESENTATIVE WAS
DISPATCHED TO THE AREA FROM SATURDAY AFTERNOON INTO SUNDAY
MORNING...TO ASSIST IN REVIEWING THE EVIDENCE AND TO CORROBORATE ON
THE FINAL ASSESSMENT.

THE THREE TORNADOES ARE RATED AS FOLLOWS:

1. THE ALMORA-BLUFFTON MN TORNADO IS RATED AS EF4...WITH PEAK WINDS
ESTIMATED TO 175 MPH. THIS TORNADO MADE ITS INITIAL TOUCH DOWN
ROUGHLY 3 MILES NORTH-NORTHEAST OF LEAF VALLEY MN AROUND 345 PM...
AND PRODUCED A CONTINUOUS DAMAGE PATH THROUGH ALMORA MN...PASSING
JUST EAST OF DEER CREEK AND JUST WEST OF BLUFFTON...BEFORE LIFTING
ABOUT 10 MILES NORTH OF BLUFFTON BY 445 PM. DAMAGE WITH THIS
TORNADO COMPLEX EXTENDED OUT AS MUCH AS 1.3 MILES WIDE AT TIMES
ALONG THIS APPROXIMATELY 36 MILE LONG...NEARLY DUE NORTH DIRECTED
PATH. THE MOST EXTREME DAMAGE WAS LOCATED ALONG OTTER TAIL COUNTY
ROAD 143...WEST AND SOUTHWEST OF BLUFFTON...WHERE SEVERAL HOMES AND
FARMSTEADS WERE COMPLETELY OBLITERATED. IN ADDITION...SEVERAL
VEHICLES WERE PROPELLED HUNDREDS OF FEET THROUGH THE AIR...WHILE
NUMEROUS TREES WERE SHREDDED AND DEBARKED. THIS MULTI-VORTEX
TORNADO COMPLEX CONSISTED OF MULTIPLE TORNADIC TUBES PIVOTING AROUND
A COMMON CENTER...EACH TUBE ACTING SINGULARLY OR IN CONCERT TO
PRODUCE AREAS OF EF1 TO EF4 DAMAGE...IN A PATH THAT VARIED FROM 0.1
TO 1.3 MILES IN WIDTH. FOR MOST OF THIS TORNADOS 36 MILE PATH THE
TEAM WAS ABLE TO FIND A CONSISTENT CORE WITH EF2 OR GREATER
DAMAGE...WITH SMALLER AREAS OF EMBEDDED EF3 TO EF4 DAMAGE. THIS
TORNADO ALSO PRODUCED ONE FATALITY JUST SOUTH OF ALMORA...SHORTLY
BEFORE 4 PM.

2. THE WADENA MN TORNADO IS RATED AS EF4...WITH PEAK WINDS
ESTIMATED TO 170 MPH. THIS TORNADO MADE ITS INITIAL TOUCHDOWN
ROUGHLY 3 MILES SOUTH-SOUTHWEST OF WADENA MN AROUND 5 PM...AND
PRODUCED A CONTINUOUS DAMAGE PATH THROUGH WADENA...BEFORE LIFTING
ABOUT 7 MILES NORTH-NORTHEAST OF TOWN BY 518 PM. DAMAGE WITH THIS
TORNADO COMPLEX EXTENDED OUT AS MUCH AS 1.1 MILES WIDE AT TIMES
ALONG THIS APPROXIMATELY 10 MILE LONG...NORTH-NORTHEAST DIRECTED
PATH. THE MOST EXTREME DAMAGE WAS LOCATED FROM THE SOUTHWEST WADENA
RESIDENTIAL AREA INTO THE INDUSTRIAL AREA LOCATED BETWEEN THE HIGH
SCHOOL AND THE HIGHWAY 10 CORRIDOR. SEVERAL HOMES WERE COMPLETELY
DESTROYED AS WERE SEVERAL INDUSTRIAL OR WAREHOUSE STRUCTURES. IN
ADDITION... SEVERAL SCHOOL BUSES AND OTHER VEHICLES WERE PROPELLED
THROUGH THE AIR FOR DOZENS TO HUNDREDS OF FEET. THIS WAS ALSO A
MULTI-VORTEX TORNADO COMPLEX CONSISTING OF MULTIPLE TORNADIC TUBES
PIVOTING AROUND A COMMON CENTER...EACH TUBE ACTING SINGULARLY OR IN
CONCERT TO PRODUCE AREAS OF EF1 TO EF4 DAMAGE...IN A PATH THAT
VARIED FROM 0.1 TO 1.1 MILES IN WIDTH. FOR MOST OF THIS TORNADOS 10
MILE PATH THE TEAM WAS ABLE TO FIND A CONSISTENT CORE WITH EF2 OR
GREATER DAMAGE...WITH SMALLER AREAS OF EMBEDDED EF3 TO EF4 DAMAGE.

3. THE OWEN TORNADO...HOLMES ND...IS RATED AS EF4...WITH PEAK WINDS
ESTIMATED TO 185 MPH. THIS TORNADO MADE ITS INITIAL TOUCHDOWN
ROUGHLY 1 MILE NORTH OF MAYVILLE ND...AROUND 349 PM...AND PRODUCED A
NEAR CONTINUOUS DAMAGE PATH THROUGH RURAL NORTH-CENTRAL TRAILL
COUNTY AND INTO RURAL SOUTH-CENTRAL GRAND FORKS COUNTY...BEFORE
LIFTING ABOUT 10 MILES WEST OF THOMPSON ND...BY 410 PM. THE TORNADO
DAMAGE PATH WAS NEARLY 17 MILES LONG AND REACHED A MAXIMUM WIDTH OF
150 YARDS AT TIMES. DAMAGE WAS MOST EXTREME AT THE OWEN DAHL
RESIDENCE AND SHOP...LOCATED NEAR ND HIGHWAY 15...WHERE A HOME WAS
COMPLETELY SWEPT FROM ITS FOUNDATION AND DESTROYED.

THE JUNE 17TH TORNADO EVENTS WERE QUITE EXTENSIVE THROUGHOUT NORTH
DAKOTA AND MINNESOTA. THERE ARE NUMEROUS ADDITIONAL TORNADO REPORTS
AND POSSIBLE DAMAGE PATHS THAT ARE STILL BEING UNCOVERED AND
INVESTIGATED. ADDITIONAL TORNADO TRACK AND INTENSITY INFORMATION
WILL BE RELEASED AS THESE ARE COMPLETED OVER THE COMING DAYS.

$$
GUST


Return to News Archive

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.