Kimball, South Dakota tornado on 16 September 2006

Radar reflectivity image from 5:12 pm CDT 16 September 2006Storm relative motion image from 5:12 pm CDT 16 September 2006

This storm developed west of the Missouri River and moved northeast into Brule County.  At 5:12 pm, a brief tornado touchdown was reported with this storm 2 miles north-northeast of Kimball, South Dakota.  The tornado was rated F0.  The radar picture shown above is taken at 5:12 pm.  At this point, the storm does not appear as organized as other supercells shown from this day.  No bounded weak echo region (BWER) is evident on radar nor is there evidence of a strong circulation in Brule County at this time.  This may be because some of the velocity data is range folded and the radar cannot detect a circulation.  Another difference between this storm and the storms that formed closer to Interstate 29 is that it formed on the cold front which was moving into eastern South Dakota at this time.  The storm that produced the tornadoes in McCook and Minnehaha counties formed along a dry line.  As this storm continued to move east, it matured into a strong supercell and produced a tornado in northern Sanborn County an hour later.


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