Usually appears when moist and warm upper air try to shift the cooler and drier surface air but instead the warmer upper air rides over it and this cloud layer just happened to have got caught up in it.
Think of warm water sitting on top of chilled cooking oil and you stir that warm water around (but not the cooking oil below).
This cloud effect is usually very short lived as the warmer upper air finally wins out, or the sun heats up the cooler surface air and the lot breaks down.
Sunday 8 May 2011
Altostratus Undulatus
Usually appears when moist and warm upper air try to shift the cooler and drier surface air but instead the warmer upper air rides over it and this cloud layer just happened to have got caught up in it.
Think of warm water sitting on top of chilled cooking oil and you stir that warm water around (but not the cooking oil below).
This cloud effect is usually very short lived as the warmer upper air finally wins out, or the sun heats up the cooler surface air and the lot breaks down.
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