Weather Theatre

Weather Theatre

Feb 092014
 

An upper front and jetstreak, associated with a rapid shortwave trough crossing Tasmania, helped whip up strong, hot northwesterly surface winds on Sunday, causing extreme fire dangers with active fires in central and eastern Victoria.

WeatherTheatre SceneOne Analysis captured the upper front west of Tasmania at 9-2-2014-0Z, revealed as a tropopause fold extending some two-thirds the depth of the troposphere.

WeatherTheatre SceneOne 9-2-2014-00z, Australia, Top Down View

WeatherTheatre SceneOne 9-2-2014-00z, Australia, Top Down View. An elongated well in the tropopause surface indicates the shortwave trough, at this time just west of Tasmania. Red shadings show the strongest winds, associated with the jetstreak.

WeatherTheatre SceneOne 9-2-2014-00z, Australia, Northerly View

WeatherTheatre SceneOne 9-2-2014-00z, Australia, Northerly View. In the foreground, the upper front is revealed where the tropopause (upper) surface folds into an elongated tubular sheath, enveloping an elevated 300K Theta (lower) surface. Red shadings on the tropopause indicate the strongest winds associated with the jetstreak. Blue shadings on the 300K Theta (lower) surface indicate the coldest air while red shadings the warmest air.

Jan 312014
 

WeatherTheatre SceneOne captures Tropical Cyclone Dylan, shortly after it made landfall near the northeast Australian town of Bowen.

The mid-level core of the cyclone stands out in the SceneOne 30-1-2013-18Z Analysis as a thin vorticity tube.

Ex-Tropical Cyclone Dylan will continue to spin down, dumping a large amount of rain over central Queensland.

WeatherTheatre SceneOne 30-1-2014-18z, Australia, Southeasterly Vertical View

WeatherTheatre SceneOne 30-1-2014-18z, Australia, Southeasterly Vertical View. Shortly after making landfall, the mid-level vortex of Tropical Cyclone Dylan appears in the foreground as a thin vorticity tube. The light-blue shadings indicate lighter wind speeds near the eye of the cyclone. The reddish-pink lower surface represents the 300K Theta surface, with warmer colours indicating hotter temperatures.

WeatherTheatre SceneOne 30-1-2014-18z, Australia, Southwesterly Vertical View

WeatherTheatre SceneOne 30-1-2014-18z, Australia, Southwesterly Vertical View. As in the Southeasterly view, the mid-level vortex of Tropical Cyclone Dylan appears in the foreground as a thin vorticity tube. The light-blue shadings indicate lighter wind speeds near the eye of the cyclone. The mostly reddish-pink lower surface represents the 300K Theta surface, with warmer colours indicating hotter temperatures. In the far background, the surface becomes elevated with blue shadings, indicating cold air with a mid-latitude front. The tropopause surface immediately above dips down with red shadings indicating a strong jetstream.

Jan 092014
 

Much of the central, northern and eastern US and Canada is in the grip of a deep freeze, experiencing the coldest temperatures in decades, due to a deep polar upper low.  WeatherTheatre SceneOne gives a 3D perspective of the evolution and progression of this winter storm, also called a ‘polar vortex’.

WeatherTheatre SceneOne 3-1-2014-12z, North America, Top Down View

WeatherTheatre SceneOne 3-1-2014-12z, North America, Top Down View. An upper shortwave trough, indicated by the sharp u-shaped curvature in the jetstream along the tropopause surface in the right half of the image, shows the first wave of cold air to affect the central-eastern US. At this time, the cold air was peaking over the northeast US. Red shadings indicate the strongest winds on the tropopause while blue shadings the lightest. The 300K Theta surface partially obscures the tropopause near the top of the image, where its height is greater. The blue shading is indicative of the cold polar air mass in this region.

WeatherTheatre SceneOne 6-1-2014-00z, North America, Top Down View

WeatherTheatre SceneOne 6-1-2014-00z, North America, Top Down View. The large u-shaped valley in the tropopause represents the second wave of cold air to affect the US, longer in wavelength than the initial cold snap, and responsible for the coldest temperatures in decades. The red shadings indicate the strongest winds, associated with the jetstream. The dark blue shadings near the top indicate cold temperatures of the 300K Theta surface, which is overlapping and obscuring the tropopause.

 

 

 

 

 

 

 

 

 

 

 

The icy storm complex began shortly after New Year, 2014, with a shortwave upper trough sweeping over central-eastern states. This was then followed by a longer-wave trough associated with the ‘polar vortex’, bringing frigid conditions across much of the US. The only areas to escape were along the west coast and the far south.

WeatherTheatre SceneOne 3-1-2014-12z, North America, Westerly Vertical View

WeatherTheatre SceneOne 3-1-2014-12z, North America, Westerly Vertical View of the first cold wave, showing a deep tropopause (upper surface) fold along the wave front, shaded red due to the intense winds associated with the jetstream in this region.

WeatherTheatre SceneOne 3-1-2014-12z, North America, Northeasterly Vertical View

WeatherTheatre SceneOne 3-1-2014-12z, North America, Northeasterly Vertical View, looking along the axis of the shortwave trough responsible for the first frigid weather across central-eastern states. 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 7-1-2014-00z, North America, Top Down View

WeatherTheatre SceneOne 7-1-2014-00z, North America, Top Down View. The second and longer wavelength upper trough responsible for the coldest temperatures in decades is seen in the u-shaped tropopause valley. The red shadings indicate intense jetstream winds. The blue shaded 300K Theta surface obscures the tropopause in the valley region.

Jan 072014
 

WeatherTheatre SceneOne captures Tropical Cyclone Christine, not long before it crossed the Northwest Australian coast.  TC Christine stands out as a slender vorticity tube, coloured by wind speed, near the Northwest Australian coast on the 30-12-2013-18z SceneOne analysis.  The strongest winds are lower down the in atmosphere, as is typical for warm cored tropical cyclones (via the thermal wind relation).

WeatherTheatre SceneOne 30-12-2013-18z, Australia, Vertical Southeasterly View

WeatherTheatre SceneOne 30-12-2013-18z, Australia, Vertical Southeasterly View. Tropical Cyclone Christine stands out as a slender vorticity tube, shaded by wind speed, in the foreground.

Dec 062013
 

NW Europe is being battered by a powerful winter cold front responsible for severe winds, snowfalls, and heavy rain and flooding.  The WeatherTheatre SceneOne, 5-12-2013-12z, Vertical and Planar Views show a strong upper cold front, signified by a deep tropopause fold, and associated strong polar jet apparent in the red shadings across the NE Atlantic and NW Europe.

The upper front has lead to a deep surface low over southern Norway and steep pressure gradients to the south of the low centre, driving gale force winds.   Forecast models indicate the low rapidly moving across to western Russia by the weekend as the upper front progresses east.

WeatherTheatre SceneOne 5-12-2013-12z, Europe, Vertical Northerly View

WeatherTheatre SceneOne 5-12-2013-12z, Europe, Vertical Northerly View. A deep tropopause fold is notable in the background, shaded red due to a strong polar jetstream. The fold obscures a steep 300K theta surface indicating very cold polar air behind it. 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 5-12-2013-12z, Europe, Top-down Planar View

WeatherTheatre SceneOne 5-12-2013-12z, Europe, Top-down Planar View. A strong jetstream (red shadings) is seen entering NW Europe near the top of the view. The tropopause is obscured by the a very high 300K theta surface (the blue area) north of the jet, indicating cold polar 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).

Dec 052013
 

A burst of unseasonal, wintry weather is sweeping across southeast Australia due to a strong, upper cold front in association with a shortwave disturbance crossing the region. The front is triggering widespread rain, thunderstorms and mountain snowfalls.

The WeatherTheatre SceneOne, 4-12-2013-12z analysis, vertical views reveal a deep, narrow tropopause fold along the upper front enveloping a peak in the theta surface where cold polar air is situated behind it.  A narrow elliptical, polar jet filament on the planar view is characteristic of the short wavelength of this disturbance.

Surface cyclogensis is occurring in response to the upper front and strong thermal gradient over southeast Australia.  Forecast models indicate a surface low forming near the southern NSW coast rapidly developing and moving southeast across the Tasman Sea in the next 24 hours.

WeatherTheatre SceneOne 4-12-2013-12z Australia Southeasterly View

WeatherTheatre SceneOne 4-12-2013-12z Australia Southeasterly View. A deep, narrow, curved tropopause fold (upper surface) revealing the upper front envelopes the 300K theta (lower) surface, indicating the associated 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).

WeatherTheatre SceneOne 4-12-2013-12z Australia Top-down View

WeatherTheatre SceneOne 4-12-2013-12z Australia Top-down View. A narrow shortwave trough associated with the upper cold front moving over southeast Australia is revealed by the sharply curved, positively tilted, elliptical polar jet filament, seen in the red shadings on the tropopause, which merges with the subtropical jet at the apoapsis. 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 4-12-2013-12z Australia Westerly Vertical View

WeatherTheatre SceneOne 4-12-2013-12z Australia Westerly Vertical View. The upper front features prominently on the left of the image where it is revealed by a tropopause fold enveloping a mounded theta surface associated with 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).

WeatherTheatre SceneOne 4-12-2013-12z Australia Northerly Vertical View

WeatherTheatre SceneOne 4-12-2013-12z Australia Northerly Vertical View. A cut-away view of the upper front stands out in the foreground, showing the theta mound in the centre surrounded by a folded tropopause in the frontal zone. 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).

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).

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).

Dec 032013
 

A deep, winter cold front is sweeping over the NW USA from Canada and the NW Pacific, bringing a blast of Arctic air with widespread snowfalls.  The WeatherTheatre SceneOne, 2-12-2013-12z Analysis, dramatically illustrates the front responsible for the icy weather.  The front is marked by a deep folded tropopause, extending through most of the depth of the troposphere and dominating the centre field of view.  A steeply sloping, high theta surface intersects the fold, indicating the depth and extent of the frigid Arctic air following the front.

WeatherTheatre SceneOne 2-12-2013-12z East-Northeasterly View

WeatherTheatre SceneOne 2-12-2013-12z East-Northeasterly View. A deep tropopause fold (upper surface) intersects with the 300K Theta (lower surface), associated with a strong blast of Arctic air sweeping over the NW USA. 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).

Dec 022013
 

A cut-off, upper low over the Southern Mediterranean is driving a deep surface low near Sicily, causing widespread heavy rainfalls over the central Mediterranean. The 1-12-2013-18z WeatherTheatre SceneOne Analysis, Northerly Perspective, shows a dramatic tropopause curtain fold (upper surface), wrapping around with the upper low circulation, and an associated raised Theta surface immediately below. Forecast models show the low persisting and slowly moving southeast, then gradually weakening from the 5th.

WeatherTheatre SceneOne 1-12-2013-18z Northerly Perspective Snapshot, showing a cut-off upper low with dramatic tropopause fold near the middle 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 1-12-2013-18z Northerly Perspective Snapshot, showing a cut-off upper low with dramatic tropopause fold near 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).