000
NOUS43 KFGF 101637
PNSFGF
MNZ001>009-013>017-022>024-027>032-040-110445-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GRAND FORKS ND
1137 AM CDT FRI JUL 10 2020

...NWS DAMAGE SURVEY FOR 07/08/20 TORNADO EVENT...

.OVERVIEW... A RAPIDLY DEVELOPING SUPERCELL THUNDERSTORM PRODUCED
A LONG LIVED AND DEADLY TORNADO THAT ORIGINALLY TOUCHED DOWN IN 
FAR NORTHERN GRANT COUNTY MN, AS A WEAK TORNADO /EF0-EF1/, BUT 
THEN QUICKLY INTENSIFIED INTO A STRONG TO VIOLENT TORNADO AS IT 
CROSSED INTO SOUTHERN OTTER TAIL COUNTY, NEAR MP70 ON 
INTERSTATE-94. THE TORNADO INTENSIFIED AS A STRONG TORNADO
/EF2-EF3/ AS IT MOVED NORTHEASTWARD THROUGH SOUTHWESTERN ST. OLAF
TOWNSHIP AND CROSSED BEEBE LAKE. IT LIKELY REACHED MAXIMUM EF3 
INTENSITY AFTER IT CROSSED HIGHWAY 82 AND AS IT DESTROYED A 
MACHINE SHOP AND YARD ON THE DOWNWIND SIDE. IT THEN CONTINUED IN A
NORTHEAST DIRECTION AND REACHED BOTH MAXIMUM WIDTH AND INTENSITY 
AS IT MOVED INTO AND ACROSS A RURAL HOMESTEAD ALONG 120TH STREET
AND INTO BLACKEN LAKE. THE TORNADO CONTINUED IN A NORTHEAST 
DIRECTION PRODUCING MAINLY TREE AND CROPLAND DAMAGES AS IT CROSSED
CR117, NORTH OF KVAM CHURCH. VIDEO IMAGERY AND DEEP GROUND SCOUR
INDICATE THAT THE TORNADO MAINTAINED ITS INTENSITY AS A STRONG TO
VIOLENT TORNADO EVEN AS IT NARROWED AND EVENTUALLY BEGAN TO ROPE 
OUT, NEAR 325TH AVENUE, BETWEEN 145TH STREET AND CR12. 

THE STORM THAT PRODUCED THIS TORNADO CONTINUED EASTWARD ACROSS 
SOUTHERN OTTER TAIL COUNTY AND MAY HAVE PRODUCED ONE OR MORE 
ADDITIONAL BUT BRIEF TORNADOES ALONG ITS PATH. 

.TORNADO... GRANT AND OTTER TAIL COUNTY SOUTHEAST OF DALTON MN

RATING:                 EF-4
ESTIMATED PEAK WIND:    170 MPH 
PATH LENGTH /STATUTE/:  9 MILES
PATH WIDTH /MAXIMUM/:   650 YARDS 
FATALITIES:             1
INJURIES:               3

START DATE:             JUL 8 2020 
START TIME:             508 PM CDT
START LOCATION:         6.5 W ASHBY / GRANT COUNTY / MN
START LAT/LON:          46.09525 / -95.94205 

END DATE:               JUL 8 2020
END TIME:               539 PM CDT
END LOCATION:           5 E DALTON / OTTER TAIL COUNTY / MN
END LAT/LON:            46.17784 / -95.81200

SURVEY SUMMARY: OF PARTICULAR NOTE, A WELL BUILT MACHINE SHOP 
OF FAIRLY NEW CONSTRUCTION AND WAS COMPLETE SWEPT FROM ITS 
FOUNDATION AND DESTROYED DOWNWIND, WITH ONE FATALITY AND ONE 
INJURY THERE. AT ONE HOMESTEAD, A WELL BUILT TWO-STORY HOUSE 
WAS COMPLETELY SWEPT FROM ITS FOUNDATION AND DECIMATED IN A 
WIDESPREAD AND DISTANT DEBRIS FIELD. TWO INJURIES OCCURRED 
HERE AS A COUPLE SHELTER IN THE BASEMENT AND DEBRIS, 
INCLUDING A VEHICLE, DROPPED INTO THE EXPOSED BASEMENT.      

EF SCALE: THE ENHANCED FUJITA SCALE CLASSIFIES
TORNADOES INTO THE FOLLOWING CATEGORIES.

EF0...WEAK......65 TO 85 MPH
EF1...WEAK......86 TO 110 MPH
EF2...STRONG....111 TO 135 MPH
EF3...STRONG....136 TO 165 MPH
EF4...VIOLENT...166 TO 200 MPH
EF5...VIOLENT...>200 MPH

NOTE:
THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENTS AND PUBLICATION IN
NWS STORM DATA. 

$$

GUST

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