Nov 272013
 

The WeatherTheatre, 26-11-2013-12z, Australia, Analysis snapshots feature a strong upper front over the Tasman Sea, where the sub-tropical and polar jetstreams are merging.  Darker shadings on the top-down perspective show the steepness of the tropopause in this region, which is prominent in the upper left of the south-easterly perspective snapshot. A tiered, folding, tropopause surface indicates the merging jetstreams in the frontal region. The polar jet is associated with the lower tier and the subtropical jet the higher tier.

WeatherTheatre 26-11-2013-12z Snapshot

WeatherTheatre 26-11-2013-12z top-down snapshot.  A strong upper front over the Tasman features prominently in the darker red shadings at the right of the image.  A weakening upper trough over central Australia, apparent by the tunnel in the surface, is near the centre.  On the far left, another upper trough, apparent by another tunnel in the surface, is entering the scene.  A strong upper front, well south of the continent, is visible in the red shadings near the bottom left. 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).

 

 

A weakening upper trough, which has been supporting a surface low over Western Australia, appears near the centre of the top-down perspective as a tunnel in the tropopause surface. Another upper trough can be seen to its west and will effect Western Australia over the next 24 hours.

 

A strong upper front in the polar jet, situated well south of the continent, appears in the right background of the south-easterly perspective snapshot. This is one to watch over the next 24-48 hours as it should cause the formation of a deep surface low east of Tasmania on Thursday evening.

WeatherTheatre 26-11-2013-12z Snapshot

WeatherTheatre 26-11-2013-12z South-easterly Snapshot.  The strong upper front over the Tasman Sea features prominently as the deep fold of the tropopause (upper sruface) in the left of the image.  An upper trough over central Australia shows up near the centre foreground.  A strong upper front well south of the continent is seen by the lowering in the right background.  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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