A strong cold front will approach the Ohio River early this afternoon, with strong to severe storms developing just ahead of the front through early this evening. The most widespread and strongest storms should develop just east of I 65 shortly after 2 PM EDT. Storms will rapidly move east southeast at speeds around 45 MPH. The main threat with these storms will be the potential for very large and destructive hail, with diameters greater than 2 inches possible! This would be greater than the size of golfballs. Also accompanying the hail threat, damaging winds, heavy rainfall and cloud to ground lightning will be possible. Below is an image of where the greatest threat of severe storms is expected, along with a link to the Storm Prediction Center website.
Since some supercell structures are anticipated today, below are some pictures of cloud features that might be associated with supercells. Trained storm spotters are encouraged to report rotating wall clouds, large hail, damaging winds, and tornadoes to the NWS in Louisville should you experience one of these phenomena.
Wall clouds will rotate on a vertical axis, sometimes strongly. The wall cloud is much smaller and more compact than a shelf cloud and is usually under a rain free cloud base.
Scud clouds are often mistakenly called wall clouds or funnel clouds. In reality, these are just rising clouds due to increased low level relative humidity. They will not rotate and will rise slowly.