Extratropical Cyclone

Chapter 10:


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2.) The pacific air over the continental U.S acquired these characteristics since most of eastern North America experiences lengthy episodes of mild and generally dry weather as a result of polar air masses staying off the north while the tropical air masses stay to the south.


4.) With enough air support, an extratropical cyclone can form then intensify. Cyclogenesis mostly takes place along the polar front directly under the area of strong horizontal divergence in the upper troposphere.


6.) The Northwest sector of a mature extratropical cyclone is the warm side, and the wind directions veer, creating a cold front that is followed by a warm front. However, the cold side of the storm has wind directions that back without passing the fronts. During winter in the Northwest, substantial snowfall is more likely to form on the cold side than on the warm side.


8.) Chinook winds usually blow from the southwest and they become compressed as it descends the eastern leeward slopes where the air temperature rises making it considerably warm. The warm air becomes unsaturated, and its relative humidity decreases.

Critical Thinking:

2.) An occluded front is when an extratropical cyclone moves into colder air, and a front forms when it is in its life cycle. Cold occlusion is when air behind the advancing cold front becomes cooler than the air ahead of the warm front, and the cold air slides under and lifts the air in the warm sector, the warm front, and cool air. Warm occlusion develops when air behind the advancing cold front is not as cold as the air ahead of the warm front.


4.) An Alberta-track low brings less snowfall to the great lakes as compared to the Colorado-track low since the Alberta storm is further away from the source of moisture and travels much faster.


6.) A mature extratropical cyclone in satellite imagery has a 1500-3000 km diameter, a maximum speed of 55-70 Kilometers per hour, originates from the middle latitudes or polar fronts, and the direction of motion is eastward or northeastward. The conveyor belt model shows the circulations in a mature extratropic cyclone as different interacting air streams referred to as conveyor belts.


8.) Valley breeze is an upslope wind formed during the day, while a mountain breeze is a downslope wind formed during the night.


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