What kind of weather can you expect when a warm front is approaching?
The air mass behind a warm front is likely to be warmer and more moist than the one before the front. If a warm front is approaching, light rain or light winter precipitation is possible before and as the front passes. Behind the front, expect clearing skies, warmer temperatures and higher relative humdities.
What are the symbols for a dry cold air mass?
Weather and Climate Chap. 2 Section 2
| A | B |
|---|---|
| cP | the two-letter symbol used to indicate a cold air mass that formed over land |
| mT | the two-letter symbol used to indicate a warm air mass that formed over water |
| mP | the two-letter symbol used to indicate a cold air mass that formed over water |
What brings drizzly rain?
cold air moves under warm air; moves quickly and brings thunderstorms, heavy rains and snow. Colder weather follows. warm air moves over cold air; moves slowly and brings drizzly rain.
What is a winter anticyclone?
A high-pressure system is called an anticyclone . In winter, high pressure leads to clear skies and colder conditions.
How long do anticyclones last?
As the air sinks, it warms up, leading to warm and dry weather. Anticyclones are much larger than depressions and produce periods of settled and calm weather lasting many days or weeks.
How do anticyclones affect weather?
Pressure gradients associated with anticyclones are gentle, producing low winds or calms. Thus, anti-cyclones result in clear skies, mild winds and dry conditions. The weather becomes settled and pleasant.
What causes a anticyclone?
In an anticyclone, winds move out from a high-pressure area with wind direction clockwise in the northern hemisphere, anti-clockwise in the southern hemisphere. Such a high pressure area is usually spread over a large area, created by descending warm air devoid of moisture.
What is the difference between an anticyclone and a depression?
Areas of high pressure are called anticyclones, whilst low pressure areas are known as cyclones or depressions. Each brings with it different weather patterns. Anticyclones typically result in stable, fine weather, with clear skies whilst depressions are associated with cloudier, wetter, windier conditions.
Why does the weather change with the passage of a depression?
Under a depression air is rising, forming an area of low pressure at the surface. This rising air cools and condenses and helps encourage cloud formation, so the weather is often cloudy and wet. In the Northern Hemisphere winds blow in anticlockwise direction around a depression.
What does a large L on a weather map indicate?
On weather maps, these readings are represented as a blue “H” for high pressure or a red “L” for low pressure.