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#11
April 26th 05, 09:05 PM
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strange cloud and effect
"Waghorn" wrote Remarkable photo.Searching for 'doughnut' or annular cloud on Google finds nothing comparable (but lots of whacky stuff). IN his book 'Satellite as Microscope' RS Scorer shows satellite images of an annular cloud off the coast of Portugal but 50-100Km across. I would guess it's a thermal interacting with the layer of stratus,but it's location over orography is also highly suggestive of a flow induced vortex . Any more pictures,approx dimensions ,was it rotating as a whole?The vortices over the low countries were at least an order of magnitude larger and almost certainly have a different dynamical origin, I'll contact Andy with your query. Don't forget he was at 23,000 feet at the time, so that doughnut cloud was almost certainly too high to be thermal generated. I'm not sure if he got up to that height by means of normal lee waves. Andy? Jack |
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#12
April 26th 05, 09:05 PM
posted to uk.sci.weather
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strange cloud and effect
"Waghorn" wrote Remarkable photo.Searching for 'doughnut' or annular cloud on Google finds nothing comparable (but lots of whacky stuff). IN his book 'Satellite as Microscope' RS Scorer shows satellite images of an annular cloud off the coast of Portugal but 50-100Km across. I would guess it's a thermal interacting with the layer of stratus,but it's location over orography is also highly suggestive of a flow induced vortex . Any more pictures,approx dimensions ,was it rotating as a whole?The vortices over the low countries were at least an order of magnitude larger and almost certainly have a different dynamical origin, I'll contact Andy with your query. Don't forget he was at 23,000 feet at the time, so that doughnut cloud was almost certainly too high to be thermal generated. I'm not sure if he got up to that height by means of normal lee waves. Andy? Jack |
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#13
April 26th 05, 09:05 PM
posted to uk.sci.weather
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strange cloud and effect
"Waghorn" wrote Remarkable photo.Searching for 'doughnut' or annular cloud on Google finds nothing comparable (but lots of whacky stuff). IN his book 'Satellite as Microscope' RS Scorer shows satellite images of an annular cloud off the coast of Portugal but 50-100Km across. I would guess it's a thermal interacting with the layer of stratus,but it's location over orography is also highly suggestive of a flow induced vortex . Any more pictures,approx dimensions ,was it rotating as a whole?The vortices over the low countries were at least an order of magnitude larger and almost certainly have a different dynamical origin, I'll contact Andy with your query. Don't forget he was at 23,000 feet at the time, so that doughnut cloud was almost certainly too high to be thermal generated. I'm not sure if he got up to that height by means of normal lee waves. Andy? Jack |
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