Abbreviations: ACC, Antarctic Circumpolar Current; APF, Antarctic
Polar Front; BIC, Bayesian information criterion; RAD, restriction-site-associated DNA; SNP, single-nucleotide polymorphism.
For example, she refers to the cold circumpolar vortex as the "polar calotte" or cap, cold air pressing southward as a "spreading cold tongue," nascent waves on the polar front as spiral-formed "breakers," and the three vertical cells of the general circulation as "running like cogged wheels." Following Bergeron, she called the cyclone stage, when the cold front just overtakes the warm sector, a "seclusia" and the final stage, when the warm front is completely overtaken by the cold, an "occlusia." Summertime showery weather was referred to as "amoeba" cyclones.
In the opinion of meteorologist Lou McNally, Beck's understanding and use of the Bergen school wave-cyclone model and the procedures for identifying the polar front on a synoptic surface map placed her "at the cutting-edge of forecast theory and application." Although she was confronted by vast regions with sparse data and stations with poor observations, the discrete steps Beck learned in Bergen for identifying fronts helped her overcome these lacunae, producing a viable analysis.
The battle zone across the UK is called the
polar front. During autumn this moves southwards as the sun moves into the southern hemisphere.
In the opposite direction, ridges extend to 60[degrees]S pushing warm air into the
Polar Front zone so exciting vortex development with equally deep low pressure cores often going as low as 940hPa.
Similar weather conditions will continue to prevail on Thursday during the day, while in the evening, the country will be affected by a very cold
polar front accompanied by a depression centered over northwestern Syria.
The Jordan Meteorological Department has said temperatures will dip below the freezing point tonight and in evenings over the next couple of days as the
polar front and depression will continue to affect the Kingdom with more rainfall and snowfall forecast in highlands.
25 (Petra) The
polar front Monday is expected to deepen and snowfall will blanket areas 700m and higher above sea level with cold westerly to northwesterly gusty winds.
On Monday, the
polar front will deepen and snowfall will spread to areas 700 meters high while hail and thunderstorms are forecast in other parts of the Kingdom.
Amman, Jan.24 (Petra) The
polar front centered over Syria is forecast to deepen on Sunday, causing temperatures to dip well below their annual average and bringing heavy rain accompanied with thunder and lightening and snow across the Kingdom.
The impact of the
polar front will deepen on Friday when a sharp drop in mercury levels is expected.
* the link between sea level rise south of the
polar fronts, deep subsurface warming and large-scale wind shifts.
