For a low-pressure system to strengthen, the surface air pressure must decrease.
ID: 111146 • Letter: F
Question
For a low-pressure system to strengthen, the surface air pressure must decrease.. Select one: True False. Which statement is not true about winter storms?. Select one: a. blizzards are most common in the north central Plains of the US (i.e., North Dakota). b. a Nor'Easter is a strong low-pressure system that forms along the east coast of the US. c. the north eastern states in the US have the highest annual frequency of freezing rain events. d. winter storms are most commonly found developing at the northern most point of a ridge in the jet stream. A large winter storm system is approaching your area, but the national weather service is not issuing a blizzard warning. They instead issues a winter storm warning. Why didn't they issue a blizzard warning?. Select one: a. snow was falling at a rate of 3 inches per hour. b. the visibility was reduced to 1/10th of a mile. c. the maximum sustained winds were 22 mph. d. the conditions listed above lasted for 6 hours...Explanation / Answer
11. b. True
Low pressure systems develop, mature and then dissipate. When a low pressure system is developing or strengthening it will be referred to as a deepening system. When a low pressure system deepens, the central surface pressure will lower and/or the height minimums aloft associated with the low pressure will lower. It is rising air that causes surface pressure to lower and heights aloft to lower. Rising air cools. Since cooling air becomes more dense, the height surfaces aloft become more compact and thus the height surfaces lower closer to the earth's surface. The stronger the air rises, the lower the surface pressure and the lower the height surfaces aloft will become.
When a low pressure system is dissipating or weakening it will be referred to as a filling system. When a low pressure system fills, the central surface pressure will rise and/or the height minimums aloft associated with the low pressure will rise. When the rising motion decreases in the low pressure system, the system will start to fill.
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