Dear Tom, How is cloud coverage determined to classify the sky as partly cloudy, mostly cloudy, or cloudy? Thanks, Jerry Reedy Geneseo Dear Jerry, The National Weather Service divides the sky into … ...

It’s not just the title of a 1980s Brat Pack movie: St. Elmo’s fire is the name given to bright, sudden flashes of apparent lightning that can dance across a cloudy sky when thunderstorms are ...

The national Weather Service records daily sky cover conditions on a scale from 0 to 10. On the scale, 0 is a completely clear sky throughout the majority of the day and 10 is a completely cloudy sky.