Air from the UK comes from 4 different directions.
- Polar Maritime- Cool, wet air from the North West (5deg to 10deg)
- Polar Continental-Very cold, very dry air from North East (-10deg to 5deg)
- Tropical Maritime- Warm, wet air from the South West (15deg to 20deg)
- Tropical Continental- Warm, dry air from the South East (20deg- 25deg)
The Oceans Effects on British Climate
In summer months the latitude counts for more so the land get warmed up more than the surrounding sea. The sea takes longer to warm up due to its high LHC.
In winter months to fact that the sea cools down more slowly than the land so the land becomes much colder than the ocean.
Therefore land nearer to the sea is cooler in the Summer than the main land and warmer in the winter.
Cross Section of a Depression
Ana and Kata Frontal Depressions
Ana Front Depressions: Rising air causing thick cloud high up because the air is not trapped as the jet stream is higher up.
Kata Front Depressions: The jet stream is lower down so warm air gets trapped lower down causing lower or less cloud coverage.
- High Pressure, the opposite to a low pressure depression.
- Fewer and more widely spaced isobars.
- Gentle breezes, low winds.
- Quite stable (for days or weeks, whereas depressions last for a few hours.)
- Cloudless skies= sunny.
- Hot in the summer; heat waves.
- Early morning fog or dew.
- Frost in the winter.
- Gloomy in the winter if the sun isn't strong enough to vaporise mist.
- High pressure often BLOCKS out low pressure.
Types of Fog
ADVECTION FOG: Movement of moist warm air over cool surfaces like the ocean.
RADIATION FOG: Clear skies and calm winds cause rapid loss of heat from Eath's surface. This cooling causes a layer of moist air to form near the ground.
UP SLOPE FOG: Moist air is pushed up a mountain to where it's cooler causing the water so it condenses and forming fog.