14 Airmasses and Fronts

14 Airmasses and Fronts - Air masses and fronts GEOG 345...

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Unformatted text preview: Air masses and fronts GEOG 345 October 24 2006 Textbook: chapter 11 http://www.weatherdish.com/imagery.htm GOES-10 http://www.weatherdish.com/imagery.htm METEOSAT http://www.weatherdish.com/imagery.htm IndoEx http://www.weatherdish.com/imagery.htm GMS Fig. 10-2, p. 257 Three-cell model: spinning Earth Arrows show winds at the surface Doldrums, horse latitudes: areas of light winds Ferrel cell: thermally indirect cell (cold air rises, warm air sinks) The three-cell model represents well actual conditions at the surface Air masses Homogeneous masses of air having specific conditions of temperature, humidity and stability Source regions where air masses originate and take uniform characteristics through surface-air interaction Classification according to source region 1. Moisture m aritime and c ontinental 2. Temperature A rctic, P olar, T ropical, E quatorial and A nt A rctic Table 11-1, p. 287 Air mass classification Fig. 11-1, p. 286 High pressure system high and low pressure systems are often associated with air masses Note the large difference between Pittsburg and Philadelphia mountain effect. Fig. 11-2, p. 287 Air masses in North America Most air mass paths follow the typical westerly general circulation pattern at mid-latitudes. Continental Polar (cP) and Continental Arctic (cA) air masses Winter: snow- and ice covered northern Canada no topographic barriers as it moves south areas on the East and West coasts are somewhat protected mountain effect dry, but as it reaches the Great Lakes heavy snowfall occurs due to lake effect Summer: warmer (but still cool) and moister air no inversion near the surface Fig. 11-3, p. 288 Cold outbreaks in North America meridional air flow no topographic barriers Fig. 3, p. 292 The Siberian Express unusually cold outbreak of cA air mass record high sea surface pressure, steep pressure gradient and strong winds Fig. 1, p. 289Fig....
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14 Airmasses and Fronts - Air masses and fronts GEOG 345...

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