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.Tornadoes:
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Tornado - Martell, Spring Valley
Track Map  
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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 |
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Photos
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| Damage near Martell | Damage to home west of Spring Valley | Roof damage near Martell |
Radar:
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| Radar images at 19 Z | Radar images at 20 Z | Radar images at 21 Z | Radar images at 22 Z |
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| 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.
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| Effective bulk shear loop from 16-20 Z | Mixed layer CAPE at 21 Z | Surface analysis at 12 Z |
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| 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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