Extreme Instability, Scary weather and incredible shots [37 pics. Extreme Instability: Nebraska Sand Hills Monster Supercell Storm Very intense high precipitation supercell storm moves south in the Nebraska Sand Hills south of Valentine, July 13, 2009.
Very low, long and fat inflow cloud stretches east of the storm. Winds gusted upwards of 60+ mph into this storm. Tornado warning with the storm mentioned baseball size hail and winds in excess of 100 mph, a rare warning text indeed. 70 Lightning Strikes in One Shot.