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Overview

An EF-1 tornado occurred in Pierce County Wisconsin near the Twin Cities metro area on June 28, 2017. Tree trunks were uprooted and snapped, homes had significant roof damage, and a truck slid out of a garage and was flipped onto its side.

Tornado
Photos
Radar
Storm Reports
Environment

Tornadoes:

Tornado - Martell, Spring Valley
Pierce County

Date	28 June 2017
Time (Local)	4:25 PM-4:49 PM CDT
EF Rating	EF-1
Est. Peak Winds	105 mph
Path Length	11.7 miles
Max Width	700 yards
Injuries/Deaths	0 fatalities, 1 injured
Summary: The tornado touched down 6 miles north of Ellsworth and tracked east across northeastern Pierce County. It dissipated 2 miles south-southwest of Spring Valley. Trees were uprooted, homes sustained roof damage, a truck was flipped, and barns were significantly damaged.

Track Map

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph

Photos


Damage near Martell	Damage to home west of Spring Valley	Roof damage near Martell

Radar:


Radar images at 19 Z	Radar images at 20 Z	Radar images at 21 Z	Radar images at 22 Z


Correlation coefficient loop showing tornado/debris ball

Storm Reports

Click link to see storm reports for June 28, 2017: http://www.spc.noaa.gov/exper/archive/event.php?date=20170628

Environment

On the morning of June 28, 2017, a low pressure system was located over the North Dakota/South Dakota border. As the day progressed, this low moved over central Minnesota. Moist unstable air led to convection in which an EF-1 tornado was produced.


Effective bulk shear loop from 16-20 Z	Mixed layer CAPE at 21 Z	Surface analysis at 12 Z


Storm Relative Helicity loop from 0-3 km	Significant tornado parameter (contours) and MLCIN (shaded) at 20 Z	MPX sounding at 21 Z

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Excessive Rainfall in the Southern Plains; Extreme Heat Coming to the Southwest U.S.

June 28, 2017 Pierce County Wisconsin Tornado