Nov 282013
 

A vigorous, early-winter season cold front has lead to the rapid development of a deep surface low over the northeast USA, bringing widespread snowfalls.  The front features prominently on 27-11-2013-18z, WeatherTheatre snapshots.  The Top-down Perspective of the tropopause shows a large amplitude, positively tilted, shortwave disturbance on the right side.  A distinctive and dramatic double-fold tropopause ‘curtain’ is apparent on the Northerly Perspective, as the subtropical jet begins to merge with the polar jet at the jetstreak entrance region.  Meanwhile, deep-blue shadings in the background are a very much elevated 300K Theta surface associated with very cold air.

WeatherTheatre 27-11-2013-18z Northerly Perspective Snapshot.

WeatherTheatre 27-11-2013-18z Northerly Perspective Snapshot. A ‘curtain’ tropopause displays twin folds, more distinctive in the foreground, where jetstreams merge.  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 27-11-2013-18z Top-down Snapshot.

WeatherTheatre 27-11-2013-18z Top-down Snapshot.  The large amplitude, shortwave disturbance features prominently on the right, where its associated jetstreak stands out in the red shading.  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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