Dec 032013
 

A strong, upper cold front is situated south of Australia, in the background of the WeatherTheatre SceneOne, 3-12-2013-0z Analysis, Southerly View.  The front is marked by a deep tropopause fold and associated elevated theta surface behind, indicating a good depth and spread of cold air following.

A tongue of warm air stretches across Southeast Australia preceding the front, reflected in the valley in the 300K Theta surface, where the intersection with the surface corresponds to the 27 degree celcius isotherm.  Forecast models project widespread rain across Southeast Australia ahead of the front and the cold-air behind the front should bring unseasonal snowfalls to the Southeast Australia mountains on Thursday, 5th.

A tropopause lowering over the Tasman Sea, seen on the left side of SceneOne and coming into view in the last few frames of the Southerly to Westerly Orbital View, is associated with a cut-off low which is expected to gradually weaken in the next two days.

WeatherTheatre SceneOne 3-12-2013-0z Southerly to Westerly Orbital View.

WeatherTheatre SceneOne 3-12-2013-0z Southerly to Westerly Orbital View. A strong upper cold front appears south of the continent in the first few frames. A cut-off upper low over the Tasman, which is also driving a cut-off surface low, comes into scene in the last few frames as a lowered tropopause in the top foreground. 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 3-12-2013-0z Southerly View

WeatherTheatre SceneOne 3-12-2013-0z Southerly View. A strong, upper cold front stands out in the background, apparent by the folded tropopause (upper surface), shaded red due to the strong jetstream winds associated with the front. The fold wraps around a large mound in the 300K Theta surface below which provides an indication of the depth and spread of the cold air. 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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