Preliminary Storm Damage Survey Report

...JULY 22ND TORNADO IN EASTERN MAHNOMEN/WESTERN CLEARWATER COUNTIES 
RATED LOW END EF2...

* RATING: EF2

* ESTIMATED PEAK WIND: AROUND 115 MPH

* PATH LENGTH: TOTAL ESTIMATED 18 MILES WITH INTERMITTENT GAPS

* PATH WIDTH: RANGED FROM 20 YARDS TO 150 YARDS MAXIMUM

* FATALITIES/INJURIES: NONE

* ESTIMATED START/END TIMES: MONDAY JULY 22ND...150 AM CDT TO 230 AM 
CDT

* EVENT LOCATION: BEGAN 3 MILES EAST SOUTHEAST OF MAHNOMEN TO 4.5 
MILES WEST NORTHWEST OF ZERKEL.

* DISCUSSION/DAMAGE: THE TORNADO DAMAGED STRUCTURES AT THREE 
LOCATIONS WITH INTERMITTENT CROP AND TREE DAMAGE. THE FIRST LOCATION 
WAS 7 MILES EAST SOUTHEAST OF MAHNOMEN WHERE A HOUSE AND NUMEROUS 
TREES SUSTAINED EF1 DAMAGE...WITH WINDS AROUND 95 MPH. THE SECOND 
LOCATION WAS 10 MILES EAST SOUTHEAST OF MAHNOMEN WHERE A POLE BARN 
WAS COMPLETELY DESTROYED AND FARM EQUIPMENT LOFTED SUSTAINING EF2 
DAMAGE...WINDS AROUND 115 MPH. THE THIRD LOCATION WAS AT ROY LAKE 
WHERE THE PATH WIDTH WAS THE LARGEST. HERE MULTIPLE TREE AND 
BUILDING DAMAGE WAS CAUSED BY WINDS AROUND 100 MPH...EF1.

EF SCALE:

FOR REFERENCE...THE ENHANCED FUJITA TORNADO SCALE CLASSIFIES
TORNADOES INTO THE FOLLOWING CATEGORIES:

EF0...WIND SPEEDS 65 TO 85 MPH.
EF1...WIND SPEEDS 86 TO 110 MPH.
EF2...WIND SPEEDS 111 TO 135 MPH.
EF3...WIND SPEEDS 136 TO 165 MPH.
EF4...WIND SPEEDS 166 TO 200 MPH.
EF5...WIND SPEEDS GREATER THAN 200 MPH.

THE NATIONAL WEATHER SERVICE WISHES TO THANK THE COUNTY SHERIFF AND 
EMERGENCY MANAGEMENT OF MAHNOMEN COUNTY ALONG WITH COUNTY RESIDENTS 
FOR PROVIDING DETAILED STORM REPORTS.

$$
JK/JAM/BB

UPPER RIGHT AERIAL PHOTO OF DAMAGE PATH COURTESY OF MAHNOMEN COUNTY 
SHERIFF.
 
 
 

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