Holy Mackerel!

A fine example of an all-altocumulus (mackerel) sky displayed itself just after 7:00 AM on Tuesday, October 16, 2012 as seen in this image from Brentwood Drive NE in Cedar Rapids, Iowa. These two images look northeast.  These types of clouds form when there is moisture present at middle levels, and when temperatures range from somewhat colder than freezing to a little warmer than freezing. Larger areas of altocumulus usually accompany the more important moving weather systems and the flow of significant moisture over hundreds of miles. Altocumulus range from 6,500 to 16,500 feet above ground.