Spotted earlier on today. This wavy-like middle layer cloud cover was observed while I was on my way home from work at 4 pm.
Usually it's caused by warm air riding over a mass of surface-level cold air. Think of the cold air being like a huge slab of jelly, all wobbly but not going anywhere and the warm air above is causing it to "wave".
Usually it's a summer feature which indicates instability prior to a thunderstorm, but for some reason I got to see this cloud feature today even though it is still winter!
Monday, 8 March 2010
Altostratus Undulatus
Spotted earlier on today. This wavy-like middle layer cloud cover was observed while I was on my way home from work at 4 pm.
Usually it's caused by warm air riding over a mass of surface-level cold air. Think of the cold air being like a huge slab of jelly, all wobbly but not going anywhere and the warm air above is causing it to "wave".
Usually it's a summer feature which indicates instability prior to a thunderstorm, but for some reason I got to see this cloud feature today even though it is still winter!
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