Astronomy Picture of the Day


Morning Glory Clouds Over Australia

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#110379 by [z]Barbara Harris @ 25.08.2009 00:00 - nach oben -
Morning Glory Clouds Over Australia


Explanation:
What causes these long, strange clouds?

No one is sure.

A rare type of cloud known as a
Morning Glory cloud can stretch 1,000 kilometers long and
occur at altitudes up to two kilometers high.

Although similar
roll clouds have been seen at specific places across the world, the ones over
Burketown,
Queensland
Australia
occur predictably every spring.

Long, horizontal, circulating tubes of air might form when flowing, moist, cooling air encounters an
inversion layer, an atmospheric layer where air temperature atypically increases with height.

These tubes
and surrounding air could cause dangerous turbulence for airplanes when clear.

Morning Glory clouds can reportedly achieve an
airspeed of 60 kilometers per hour over a surface with little discernible wind.

Pictured above, photographer Mick Petroff photographed some
Morning Glory clouds from his airplane near the
Gulf of Carpentaria, Australia.




digg_url = 'http://apod.nasa.gov/apod/ap090824.html'; digg_skin = 'compact';




Credit & Copyright
#110389 by Squeezer @ 25.08.2009 19:08 - nach oben -
1000km morning glory ;-)
#110384 by Buezi @ 25.08.2009 12:39 - nach oben -
da gfallt mir jetzt usnahmswiis mal wieder
#110412 by IneX @ 27.08.2009 17:50 - nach oben -
fett!

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