DAYTON — Yesterday, cloud cover and rain moved in late afternoon and hung around throughout the early evening hours.
Everything during that time frame was sub-severe.
The rain held throughout the evening, stabilizing our atmosphere.
There was never a break within the two rounds of rain and storms.
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So, as the strongest and the severe storms from Indiana moved east toward the Valley, most weakened.
However, winds aloft influenced our strong storms throughout the overnight hours.
Wind shear, wind speed, and direction changing with height in the atmosphere increase the spin within a severe storm.
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Storms to our west had the opportunity to produce damaging winds and long-lived strong tornadoes.
The reason is energy at the surface. Temperatures were warm, and dew points were in the 60s and 70s.
This, along with the boundary adding lift and the increased wind shear, helped produce major supercells across the Midwest.
As they moved eastward, they hit a more stable airmass, allowing for weakening and no further development.
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