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June 21st, 2007 South Dakota and Nebraska Supercells

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Last Updated on Monday, 04 January 2010 21:06 Written by Roger Hill

2007

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It is a rare occasion that you get woken up at 6 AM with a TORNADO WARNED supercell out your window! June 21st was one of those days!  A cluster of supercells developed overnight and moved southeast across south central South Dakota. We intercepted one near Kimball, SD that produced 4.25 diameter hail! Later that day, an old boundary would provide the lift and convergence to develop the best storm of the day, that also produced hail to 3.5" in diameter! 
Check out the photos below. Click on a thumbnail for a larger image.

 

 

 

Elevated supercell approaches Kimball, SD.

 

Looking north as the cell just misses our location.

 

Near White Lake, SD hailstones lay all over the ground, up to 4.25" in diameter.

 

Later that day, towers went up along the boundary, but struggled with the cap.

 

Finally by late afternoon, one particular tower exploded.

 

Rock hard intense convection with this supercell!

 

Beautiful updraft in northern Nebraska, north of Stuart.

 

Laminar base, with lowering. Storm became tornado warned here.

 

Base was just a bit too high for tornadoes to develop, despite strong rotation.

 

This is a close as it came! Lowering, rotating, clear slot, just couldn't get it done.

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