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The expanding donut

Posted Thursday, July 28, 2011, at 6:24 AM

An expanding blue donut is my best description of a weather pattern I saw on the local radar map this morning and I am curious if any of you weather folks could tell me what was happening.

Halfway between Florence, AL and Huntsville a blue circle with a hole in it started out about lifesaver size and expanded symmetrically out as the time lapse progressed.

It did not seem to have any yellow or red in it, so I presume it was not a storm but what was it and how did it form? Any ideas?

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I moved around some more and found one from the Fort Smith, AR radar forming west of Hot Springs, so this must not be as rare as I thought, but still makes me wonder what and why.

-- Posted by stevemills on Thu, Jul 28, 2011, at 6:33 AM

I went back to look at it after I posted this and noticed that Nashville had a similar occurrence but much less defined.

I was looking at Huntsville radar, by the way, so it did not appear to be the radar sweep you might expect emanating from the radar itself.

-- Posted by stevemills on Thu, Jul 28, 2011, at 6:28 AM

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Steve Mills and his wife have one daughter. They previously owned two coffee/ice cream shops, currently operate an internet sales company and teach classes, but his primary job involves the paper industry worldwide. Hobbies and interests lie in gardening, photography, recorded music and of course, their pets.