Nov 292013
 

An upper cold front has passed across Tasmania overnight, rapidly moving over the Tasman Sea towards New Zealand today.  A broad tropopause ‘curtain’ fold, dramatically illustrating the front, hangs over the Tasman Sea in the 28-11-2013-18z, WeatherTheatre SceneOne Australia snapshots. The heaped up Theta surface below shows the extent of the associated cold air.

WeatherTheatre SceneOne 28-11-2013-18z Snapshot

WeatherTheatre SceneOne 28-11-2013-18z Westerly Perspective Snapshot. A heaped-up Theta (lower surface) mound illustrates the extent of the cold air associated with the upper cold front, identified by the tropopause curtain situated immediately above. Red shadings correlate with the strongest winds (upper surface) and warmest temperatures (lower surface). Conversely, blue shadings correlate with the weakest winds (upper surface) and coldest temperatures (lower surface).

WeatherTheatre SceneOne 28-11-2013-18z Snapshot

WeatherTheatre SceneOne 28-11-2013-18z Top-down Perspective Snapshot. The valley in the tropopause marks an upper cold front crossing the Tasman Sea. Red shadings correlate with the strongest winds. Conversely, blue shadings correlate with the weakest winds.

WeatherTheatre SceneOne 28-11-2013-18z Snapshot

WeatherTheatre SceneOne 28-11-2013-18z Southeasterly Perspective Snapshot. The curtain appearance of the tropopause (upper surface) in the background signifies an upper cold front crossing the Tasman Sea. Red shadings correlate with the strongest winds (upper surface) and warmest temperatures (lower surface). Conversely, blue shadings correlate with the weakest winds (upper surface) and coldest temperatures (lower surface).

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