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Undulating clouds over Donegal this morning 25/7/11
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25-07-2011 7:15pm#1
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CLouds over Glenties, Co.Donegal this morning. Any description of what they are / causes etc?
I'd say they are Altostratus Undulatus Opacus (As Un Op) although they seem quite low based. The undulations in the 1st picture seem to part of a separate layer with may possibly be isolated patches Stratus Undulatus (St Un) although my sense of perspective was never the best!
Undulations in clouds are caused by wind shear at the level in which they are occuring. Wind shear basically wind that is moving either in slightly different directions at different levels in the atmosphere or the same direction but at different speeds. The latter is more likely I think to have caused the 'billowing' or 'roll' effect of the clouds in this case
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Deep Easterly wrote: »I'd say they are Altostratus Undulatus Opacus (As Un Op) although they seem quite low based. The undulations in the 1st picture seem to part of a separate layer with may possibly be isolated patches Stratus Undulatus (St Un) although my sense of perspective was never the best!
Undulations in clouds are caused by wind shear at the level in which they are occuring. Wind shear basically wind that is moving either in slightly different directions at different levels in the atmosphere or the same direction but at different speeds. The latter is more likely I think to have caused the 'billowing' or 'roll' effect of the clouds in this case
A little bit more shear and BOOM ! , one of the most rare clouds ... Kelvin-Helmholtz Clouds!... still a great shot though!0 -
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