CIMSS NearCast 780mb Theta E product depicted decreasing values from 15 UTC (first image – around 329 K in NW OH) to 19 UTC (second image – around 327 K in NW OH)  on May 13.  Storms seemed to decrease in coverage and intensity 18-20 UTC in NW OH.  The decrease in mid level moisture around 780 mb may have caused the decrease in storm coverage and intensity. The GOES Vertical Theta-e Differential Mid-Low product showed an increase 15 to 19 UTC from -5 K to +1 K, which may have helped to cause the decrease in storm coverage and intensity.

Michael Scotten