860
NOUS43 KFGF 062236 RRA
PNSFGF
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-071045-
PUBLIC INFORMATION STATEMENT...DELAYED
NATIONAL WEATHER SERVICE GRAND FORKS ND
536 PM CDT MON OCT 6 2025
NOUS43 KFGF 061430
PNSFGF
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-071045-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GRAND FORKS ND
536 PM CDT MON OCT 6 2025
..CORRECTION TO LATITUDE END POINT
.ENDERLIN TORNADO #1 UPGRADED TO EF-5.
THE NATIONAL WEATHER SERVICE IN GRAND FORKS CONDUCTED ADDITIONAL
SURVEYS AND WORKED EXTENSIVELY WITH WIND DAMAGE EXPERTS TO FURTHER
INVESTIGATE THE 20 JUNE 2025 ENDERLIN, ND TORNADO #1. THE ESTIMATED
MAXIMUM WIND SPEED OF THE ENDERLIN, ND TORNADO #1 IS GREATER THAN
210 MPH AND OCCURRED DURING THE TIME OF THE TRAIN DERAILMENT SOUTH
OF ENDERLIN, ND. THE ANALYSIS INVOLVED FORENSIC DAMAGE WIND SPEED
ESTIMATES FOR TIPPING SEVERAL FULLY-LOADED GRAIN HOPPER CARS AND
LOFTING OF TANKER CARS, INCLUDING ONE EMPTY TANKER CAR THAT WAS
TOSSED ABOUT 475.5 FT (145 M). THE MAXIMUM WIND SPEED ALSO CORRELATES
TO THE MAXIMUM STRENGTH ON THE WSR-88D STORM-RELATIVE VELOCITY DATA
FROM KMVX.
ADDITIONAL HIGH-END DAMAGE INDICATORS THAT HAVE BEEN REANALYZED AND
ADJUSTED TO INCLUDE DAMAGE TO THE TREES NEAR THE MAPLE RIVER EAST OF
ENDERLIN AND DAMAGE TO FARMSTEAD #2 ON HWY 46. FURTHER ANALYSIS OF
THE TREES SURROUNDING THE MAPLE RIVER SHOW EXTENSIVE TREE DAMAGE
THROUGHOUT THE ENTIRE RIVER VALLEY WITH ONLY STUBS OF LARGE BRANCHES
OR TRUNKS REMAINING AND DEBARKING WITH A "SANDPAPERING" EFFECT
PREVALENT. TREES WITH ATTACHED ROOT BALL DISPLACEMENTS WERE NOTED,
INCLUDING ONE WHERE THE ORIGINAL LOCATION COULD NOT BE DETERMINED.
WIND DAMAGE EXPERT ANALYSES HELPED DETERMINE THE DAMAGE AT FARMSTEAD
#2 TO BE COMPLETE DESTRUCTION WITH THE FOUNDATION CONSIDERED TO BE
SWEPT CLEAN, AND DEBRIS SWEPT DOWNWIND AND SCATTERED. HOWEVER, ISSUES
SURROUNDING THE LACK OF PROPER ANCHORING WILL LIMIT THE OVERALL RATING
IN THIS AREA. TREES AROUND THE FARMSTEAD WERE ALSO DEBARKED, AND SAW
ROOT BALL DISPLACEMENTS.
THE NATIONAL WEATHER SERVICE IN GRAND FORKS WOULD LIKE TO THANK TIM
MARSHALL, JIM LADUE, DR. CONNELL MILLER, DR. GREG KOPP, DR. DAVID
SILLS, AND THE ENTIRE NORTHERN TORNADOES PROJECT AT WESTERN
UNIVERSITY'S CANADIAN SEVERE STORMS LABORATORY TEAM FOR THEIR
ASSISTANCE.
RATING: EF-5
ESTIMATED PEAK WIND: GREATER THAN 210 MPH
PATH LENGTH /STATUTE/: 12.10 MILES
PATH WIDTH /MAXIMUM/: 1850 YARDS / 1.05 MILES
FATALITIES: 3
INJURIES: 0
START DATE: 06/20/2025
START TIME: 11:02 PM CDT
START LOCATION: 3 S ENDERLIN / RANSOM COUNTY / ND
START LAT/LON: 46.5728 / -97.6031
END DATE: 06/20/2025
END TIME: 11:21 PM CDT
END LOCATION: 5 SSW ALICE / CASS COUNTY / ND
END LAT/LON: 46.687 / -97.5803
EF SCALE: THE ENHANCED FUJITA SCALE CLASSIFIES TORNADOES INTO THE
FOLLOWING CATEGORIES:
EF0.....65 TO 85 MPH
EF1.....86 TO 110 MPH
EF2.....111 TO 135 MPH
EF3.....136 TO 165 MPH
EF4.....166 TO 200 MPH
EF5.....>200 MPH
NOTE:
THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT AND PUBLICATION IN NWS
STORM DATA.
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