Nov 272013
 

The WeatherTheatre, 27-11-2013-0z, North American Analysis shows a strong upper front crossing the Northeastern USA, which is driving rapid cyclogenesis and the formation of a deep surface low. The Northwesterly Perspective shows the eastern side of a deep tropopause fold (upper surface), oriented from the southwest to the northeast.  Comparison between the Northeasterly and Northwesterly Perspectives reveals the elongated nature of the front which runs across the eastern USA from the southwest to the northeast.  The raised Theta surface below indicates the spread of the associated cold air.

WeatherTheatre 27-11-2013-00z Snapshot

WeatherTheatre USA, 27-11-2013-00z, Northwesterly Perspective.  The poleward, northeasterly orientation of a strong upper front and tropopause fold (upper surface) across the eastern USA is apparent. 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 27-11-2013-00z Snapshot

WeatherTheatre 27-11-2013-00z USA Northeasterly Perspective. A strong upper front and deep tropopause fold (upper surface) dominates the centre 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).

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