GEO 125

Physical Geography

Extratropical Cyclonic Storms

Extratropical Cyclonic Storms

• Commonly called lows or depressions

• Macroscale weather events of the midlatitudes caused by the collision of air masses such as continental polar and maritime tropical air

• Counter clockwise wind circulation in the northern hemisphere

• Barometric pressure in the vicinity of 29.0 inches of mercury

Structure of Extratropical Cyclonic Storms

• Centered on a low pressure systems

• Leading warm front

• Trailing cold front

Weather Patterns Associated with the Passage of an Extratropical Cyclonic Storm

• Temperature

• Relative humidity

• Barometric pressure

• Cloud types

• Pricipitation

• Winds

Relationship between Extratropical Cyclonic Storms and Anticylonic Systems

Storm tracks of extratropical cyclonic storms

Pairs of extratropical and cyclonic storm systems in the northern hemisphere

Relationship to the jet stream

• Ridges of high pressure

• Troughs of low pressure

• Rosby waves

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