These images from the Multi-angle Imaging SpectroRadiometer (MISR) portray an
occluded extratropical cyclone situated in the Southern Ocean, about 650
kilometers south of the Eyre Peninsula, South Australia.
image, a true-color view from MISRs nadir (vertical-viewing) camera, shows clouds just south of the Yorke Peninsula and the Murray-Darling
river basin in Australia.
Retrieved cloud-tracked wind velocities are indicated by the
superimposed arrows. The image on the right displays cloud-top heights.
Areas where cloud heights could not be retrieved are shown in black.
Both the wind vectors and the cloud heights were derived using data from
multiple MISR cameras within automated computer processing algorithms.
The stereoscopic algorithms used to generate these results are still
being refined, and future versions of these products may show modest
Extratropical cyclones are the dominant weather system at
midlatitudes, and the term is used generically for regional low-pressure
systems in the mid- to high-latitudes. In the southern hemisphere,
cyclonic rotation is clockwise. These storms obtain their energy from
temperature differences between air masses on either side of warm and
cold fronts, and their characteristic pattern is of warm and cold fronts
radiating out from a migrating low pressure center which forms, deepens,
and dissipates as the fronts fold and collapse on each other. The center
of this cyclone has started to decay, with the band of cloud to the
south most likely representing the main front that was originally
connected with the cyclonic circulation.
These views were acquired on October 11, 2001, and the large view
represents an area of about 380 kilometers x 1900 kilometers.