dimarts, 20 de desembre de 2011

Grans núvols en forma d'onada: inestabilitat de Kelvin-Helmholtz

El blog meteorològic d'una cadena de TV local de Birmingham (Alabama) va recollir aquestes imatges de núvols en forma d'ona degut al vent amb diferents velocitats i direccions que produeix l'anomenada inestabilitat de Kelvin-Helmholtz









Com s'explica en aquesta mateixa pàgina:
The breaking waveforms of Kelvin-Helmholtz clouds are the result of shearing winds up at cloud level. A particular type of turbulence can develop in a layer of cirrus cloud, which happens to form below an inversion between air currents of differing speeds and/or directions. Sea waves break as their bases are slowed down upon reaching shallow water and their crests surge ahead. Cloud waves break in the same way: when their crests are pushed ahead of their troughs by the difference in air currents.

If you want to peg the geek meter, see the wikipedia article here.

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