Preliminary damage survey for tornadoes - May 11, 2014 - UPDATED

…Preliminary NWS Damage Survey for May 11, 2014 Tornado Event…

Overview...

A strong supercell thunderstorms developed over extreme southeast South Dakota on Sunday evening.  This storm produced a tornado near Spink, South Dakota around 7:32 pm CDT.  After doing some damage near a farmstead, the tornado lifted and the storm continued to move northeast into Iowa.  Around 8:35 pm CDT, a tornado formed 6 miles west-northwest of Hospers, IA.  The tornado was on the ground a little over 4 miles and lasted approximately 11 minutes.  While it was on a ground it did damage to 3 farmsteads.  The worst damage was to a dairy farm where $3 million in damage was estimated.  The tornado was rated EF-1 by the National Weather Service.

Hospers, IA Tornado
EF Scale Rating EF-1
Estimated Peak Wind 96 mph
Path Length in statute miles 4
Maximum path width 100 yards
Fatalities 0
Injuries 0
   
Start Date May 11, 2014
Start Time 8:35 pm CDT
Start Location 6 miles west-northwest of Hospers, IA
Lat/Lon 43.0973oN   96.0144oW
   
End Date May 11, 2014
End Time 8:46 pm CDT
End Location 4 miles northwest of Hospers, IA
Lat/Lon 43.1199oN   95.9434oW


Map of Hospers, IA tornado track

Path of Hospers, IA tornado

Click on map to download a kmz file that will display this path in Google Earth.  If you download the kmz file and import it into Google Earth, each triangle will link to a description of the damage that was observed and may also include photos.

 

A link to a video take by a deputy of the Sioux County Sheriff Department.

Radar images of the tornadic supercell as the tornado formed 6 miles west-northwest of Hospers, IA

Radar image of Hospers supercell

This radar picture is from 8:37 pm CDT, May 11, 2014.  The tornado has just formed to the west-northwest of Hospers, IA - a little over a mile from the dairy farm that sustained the greatest damage.  This storm has an hook echo with the tornado located between the heavy precipitation to the north and the "hook" west of Hospers.  The velocity image on the west shows a strong circulation associated with the tornado.  While the radar cannot see the actual tornado it does see the parent circulation in which the tornado is embedded.

Here are links to photos of damage near Hospers:

An outbuilding damaged along 380th Street.

Damage to outbuildings of a dairy farm.

Damage to windows and a roof of a home.

Spink, SD Tornado
EF Scale Rating EF-0
Estimated Peak Wind 85 mph
Path Length in statute miles 2.5
Maximum path width Unknown
Fatalities 0
Injuries 0
   
Start Date May 11, 2014
Start Time 7:32 pm CDT
Start Location 8 miles west-northwest of Akron, IA
Lat/Lon 42.8713oN   96.7332oW
   
End Date May 11, 2014
End Time 7:38 pm CDT
End Location 6 miles west-northwest of Akron, IA
Lat/Lon 42.8686oN   96.6859oW

 

Map of Spink, SD tornado track and wind damage

Path of tornado near Spink, SD

Click on map to download a kmz file that will display this path in Google Earth.  If you download the kmz file and import it into Google Earth, each triangle will link to a description of the damage that was observed.

 

 Link to video taken of the tornado by a trained spotter of the tornado near Spink, SD. (used with permission)

Radar images of the tornadic supercell when the tornado was approximately 6 miles west-northwest of Akron, IA

Radar image of the storm that produced the Spink SD tornado

 

 

 

 

This radar picture is from 7:36 pm CDT, May 11, 2014.  The tornado was nearing the end of its life and would lift 2 minutes later.  This storm also shows a hook echo in the area where the tornado tracked (shown in white above).  However, the velocity field does not show the strong circulation that was seen with the tornado that touched down near Hospers, IA an hour later.  South of where the tornado tracked, there was an area of wind damage.  The radar does show an area of higher winds (the greens on the image to the right) where the wind damage did occur.  The winds in this area were estimated to be as strong as the winds associated with the tornado.  Winds were estimated between 70 and 90 mph based upon damage reported to the National Weather Service.

Other tornadoes:

2 miles north of Hospers, IA - EF-0 
Link to video of tornado 2 miles north of Hospers, IA taken by Sioux County deputy sheriff at 8:51 pm CDT
1 mile east of Sheldon, IA - EF-0

 

 



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