Flood Inundation Mapping (FIM) was rolled out across much of the country on September 03, 2025. These FIM services include much of Minnesota and Wisconsin. For more information, please visit the Office of Water Prediction. 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.Tornadoes:
|
Tornado - Martell, Spring Valley
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 |
 |
Media use of NWS Web News Stories is encouraged! Please acknowledge the NWS as the source of any news information accessed from this site. |
|
Follow us on X
Follow us on Facebook
Follow us on YouTube
MPX RSS Feed