030 - Meteorology PPL (H) | ATPL Exam Question Bank

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What pressure pattern is typically observed during the passage of a polar front low?

A
Falling pressure in front of the warm front, constant pressure within the warm sector, rising pressure behind the cold front.
B
Falling pressure in front of the warm front, constant pressure within the warm sector, falling pressure behind the cold front.
C
Rising pressure in front of the warm front, constant pressure within the warm sector, rising pressure behind the cold front.
D
Rising pressure in front of the warm front, rising pressure within the warm sector, falling pressure behind the cold front.

Refer to figure.

Changes on the Passage of a Warm Front
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.

Changes on the Passage of a Cold Front
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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