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CH2.5 (1896 words) |
 | Compound extratropical transformation occurs when the tropical cyclone merges with a pre-existing extratropical cyclone, which usually intensifies because of the additional diabatic heat and moisture. |
| Complex extratropical transformation occurs when a tropical cyclone approaches a frontal zone and induces a new low-pressure wave on the front. |
| Extratropical cyclogenesis occurs as low-level ascent associated with warm advection becomes superimposed with upper-level ascent associated with cyclonic vorticity advection. |
| ALERT™ - Extratropical Cyclone (441 words) |
| Extratropical cyclones arise through a process called cyclogenesis, in which cold and warm air masses interact in an unstable environment. |
| Because extratropical cyclones form where cold and warm air masses come into contact with each other, however, storm formation is most favorable in the mid latitudes (between 35 and 60 degrees latitude) of both the Pacific, near the Asian coast, and the Atlantic, near Greenland and the North American coasts. |
| Extratropical storm systems are typically comprised of multiple areas of relatively low and high pressure, the locations of which can change quickly and frequently. |
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