What pressure pattern is typically observed during the passage of a polar front low?
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A
Falling pressure in front of the warm front, constant pressure within the warm sector, rising pressure behind the cold front.
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B
Falling pressure in front of the warm front, constant pressure within the warm sector, falling pressure behind the cold front.
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C
Rising pressure in front of the warm front, constant pressure within the warm sector, rising pressure behind the cold front.
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D
Rising pressure in front of the warm front, rising pressure within the warm sector, falling pressure behind the cold front.
Refer to figure.
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Changes on the Passage of a Warm Front |
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|
Temperature and dew point |
Visibility |
Surface Pressure |
Cloud and Precipitation |
Wind |
|
Temperature increases as cold sector air is replaced by warm sector air and dew point increases. |
Visibility steadily decreases as the front approaches, then at the front itself except frontal fog. |
Falls as area of low-pressure approaches then steadies in the warm sector. |
Cloud base lowers and cloud thickens with steadily increasing precipitation. |
Backs initially then veers at the front with a steady increase in speed. |
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Changes on the Passage of a Cold Front |
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|
Temperature and dew point |
Visibility |
Surface Pressure |
Cloud and Precipitation |
Wind |
|
Temperature and dew point falls as warm sector air is replaced by cold sector air. |
Just ahead of the cold front, and as it passes, visibility will be poor, but after the cold front, visibility will improve except within the showers behind. |
Falls as front approaches, then rises as front passes. |
Embedded cumulonimbus just ahead of the front then after the front passes, cloud base rises and the clouds thin. Isolated cumulus behind the front. |
Backs just before the front, then veers sharply at the front and increases in speed. After the front has passed the wind will decrease and back. |
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