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Posts: 23235 | Location: Montana | Registered: November 01, 2010
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Posts: 11362 | Location: New Hampshire | Registered: October 29, 2011
Bernard Convection Cells (open cell type) usually over the ocean but can rarely occur over land. Warm, rising air and sinking cool air (often rain saturated) in the center cause a "donut" effect. Relatively rare over land because of surface irregularities breaking up the pattern.
"And gentlemen in England now abed, shall think themselves accursed they were not here, and hold their manhoods cheap whiles any speaks that fought with us upon Saint Crispin's Day"
Posts: 2848 | Location: The Shire | Registered: October 22, 2011
Originally posted by Doc H.: Bernard Convection Cells (open cell type) usually over the ocean but can rarely occur over land. Warm, rising air and sinking cool air (often rain saturated) in the center cause a "donut" effect. Relatively rare over land because of surface irregularities breaking up the pattern.
Those would be over the ocean. I'm looking west from San Mateo.
AI gave a similar, but different explanation. I didn't see any unstable crows, but I did see a nearby contrail.
quote:
The presence of a contrail in the immediate vicinity is the smoking gun. This confirms you were witnessing a classic, textbook example of aircraft wake turbulence interacting with the atmosphere, specifically a phenomenon known as the Crow Instability.
They seem awfully big to be the result of wingtip vortices, but maybe?
ETA: It was very foggy this morning, even down here on the Peninsula. Apparently this set the stage atmospherically for such a phenomenon.This message has been edited. Last edited by: kkina,
Aircraft orbiting could be several reasons, fighters doing radar acquisition and "target management", refueling, other training types.
"Dogfighting" (ACT/DACT) similar and dis-similar air combat training, looks much different as aircraft operating in "3D airspace" not just as a single flight level.
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Posts: 46652 | Location: Box 1663 Santa Fe, New Mexico | Registered: December 20, 2008
Can also be produced by contrails from loitering aircraft as above (an obvious source if witnessed), volcanic activity (also obvious source):
Or sort of the reverse image in Fallstreak Holes:
NASA tracks these just incidentally in their satellite imagery, along with lots of other atmospheric anomalies.
"And gentlemen in England now abed, shall think themselves accursed they were not here, and hold their manhoods cheap whiles any speaks that fought with us upon Saint Crispin's Day"
Posts: 2848 | Location: The Shire | Registered: October 22, 2011
