Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

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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Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

June 28, 2017 Pierce County Wisconsin Tornado