Mysterious swirls found atop a frozen Alabama creek have challenged meteorologists and rattled social media, with some likening the formations to alien-created crop circles.

The hypnotic spirals were discovered Feb. 18 spread across Anderson Creek, a 200-yard-wide tributary of the Tennessee River in north Alabama.

Wynelle Kirkham of Rogersville, 45 miles west of Huntsville, shared multiple photos of the circles on Facebook, with only a one word comment: "Wow!"

"First thing I do in the mornings when I get up is open our shutters to look at the water from our bedroom window. I was so surprised," Kirkham told McClatchy News.

"It appeared a bit frightening, since we had no idea what caused it. We quickly went outside onto our deck and then to our lower deck to see this amazing sight. It looked like crop circles you might see when you are looking from an airplane."

The Kirkham home sits atop a 60-foot bluff, giving her an aerial vantage point. Her photos show the designs were spread as far as she could see, with the circles starting big then growing progressively smaller, like the rings on a bull's eye.

It didn't take long for local TV stations to pick up on the mystery, resulting in 13,000 reactions, nearly 700 comments and 2,500 shares. Some people said the circles had to be man made, while others suggested — or maybe joked — aliens were involved.

"Crop circles on ice," Sam Michelle McMurrey wrote on Facebook.

"This is a new phenomenon to me," neighbor Mary Jean Crisp posted. "It's as if somebody was pitching stones while the water froze."

"The aliens visited you last night!" Benson Bette said.

Kirkham and her husband, Mark, have lived along the creek 15 years and she says this is the first time they've seen such formations.

The region has experienced intense cold in recent weeks, and temperatures were in the teens the night the circles appeared. She shared her photos with a local TV meteorologists, hoping they could explain how extended cold might have caused the phenomenon.

WAAY 31 chief meteorologist Kate McKenna offered a couple of "theories" during a Feb. 18 broadcast, while using the term "crop circles" to describe the swirls.

"What I think is the best explanation for this — and I say 'think' because I've been asking other meteorologist friends what their theory is on this," McKenna reported.

"I believe that near the shoreline the water is a little more shallow so it's freezing more easily. It's able to cool down quickly. And then the wind blows that thin sheet of ice out into the water, out into the middle the creek. And then the water near the shoreline again starts to refreeze and the wind blowing that ice out into the lake causes each layer here, each ring to form, kind of like wrings in a tree trunk."

Meteorologist James Spann, of ABC 33/40, offered a slightly different explanation in a Facebook post.

"This pattern occurs when moving water forces the forming ice to slowly rotate," Spann wrote. "Shear is involved ... When on one side of the creek you have water that's moving faster than on the other side causing the ice to form in swirls."

Not everyone was convinced, however.

"Nice try, James Spann, but I know crop circles when I see 'em," William B White wrote on Facebook.


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