Dec 042013
 

Plummeting temperatures, heavy snowfalls and freezing winds are blasting the NW USA as a strong winter front progresses east.

A deep, tropopause fold envelopes and intersects with a steep, mountainous, Theta surface, revealing a vigorous Arctic cold front, slicing through most of the troposphere, in the WeatherTheatre SceneOne 4-12-2013-0z Northeasterly View.

The typical upward slope of the Theta surface from tropics to polar regions is apparent at zonal points in the WeatherTheatre Orbital Sweep, culminating in a steep ascent in the frontal region.

The front is inducing surface cyclogenesis with most forecast models indicating a low over Colorado will drift northeast and rapidly deepen in the next 48 hours.

WeatherTheatre SceneOne 4-12-2013-0z Orbital Sweep

WeatherTheatre SceneOne 4-12-2013-0z North America Orbital Sweep.  A strong front ‘hangs’ over the NW USA, showing up as a curtain fold of the tropopause (upper surface).  Typical meridional upward slope of the Theta (lower) surface from tropics to polar regions is apparent at zonal points of the sweep, with a notable steep ascent near the front.  The frontal fold intersects with the Theta surface and this is apparent from northerly points (looking south) in the sweep where bits of the tropopause can be seen beneath the Theta surface.  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 4-12-2013-0z Northeasterly View

WeatherTheatre SceneOne 4-12-2013-0z Northeasterly View. A strong Arctic front is vividly revealed by a deep tropopause fold (upper surface), partially obscuring a mountainous theta surface which is indicative of a polar atmosphere. 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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