The Morning Glory cloud is a rare meteorological phenomenon occasionally
observed in different locations around the world. The southern part of
Northern Australia's Gulf of Carpentaria is the only known location
where it can be predicted and observed on a more or less regular basis.
A Morning Glory cloud is a roll cloud that can be up to 1,000 kilometres
(620 mi) long, 1 to 2 kilometres (0.62 to 1.2 mi) high, often only 100
to 200 metres (330 to 660 ft) above the ground and can move at speeds up
to 60 kilometres (37 mi) per hour. Sometimes there is only one cloud,
sometimes there are up to eight consecutive roll clouds.
The Morning Glory is often accompanied by sudden wind squalls, intense
low-level wind shear, a rapid increase in the vertical displacement of
air parcels, and a sharp pressure jump at the surface. In the front of
the cloud, there is strong vertical motion that transports air up
through the cloud and creates the rolling appearance, while the air in
the middle and rear of the cloud becomes turbulent and sinks.
Despite being studied extensively, the Morning Glory cloud is not
clearly understood. Regardless of the complexity behind the nature of
this atmospheric phenomenon, some conclusions have been made about its
causes. Through research, one of the main causes of most Morning Glory
occurrences is the mesoscale circulations associated with sea breezes
that develop over the peninsula and the gulf. On the large scale,
Morning Glories are usually associated with frontal systems crossing
central Australia and high pressure in northern Australia. Locals have
noted that the Morning Glory is likely to occur when the humidity in the
area is high, which provides moisture for the cloud to form, and when
strong sea breezes have blown the preceding day.
Source :- http://www.unbelievableinfo.com/2013/12/the-morning-glory-cloud.html
0 comments:
Post a Comment