Weather Conditions At An Anticylone

Question 1

Winter anticyclone weather (5)

Answer 1

• cold day temperatures
• cold night temperatures
• clear skies by day and night
• may have radiation fogs
• high atmospheric pollution (pollutants trapped by a temperature inversion)

Question 2

Summer anticyclone weather (8)

Answer 2

• hot day temperatures
• warm night temperatures
• clear skies
• hazy sunshine
• morning mists
• heavy dew
• east cost have sea frets and haars
• thunderstorms if high humidity

Question 3

What are blocking anticyclones

Answer 3

Anticyclones that establish themselves over Britain and northwest Europe and remain stationary for many days

Question 4

What happens from blocking anticyclones

Answer 4

Depressions that would normally travel across the British isles on a westerly airstream are steered around the upper edge of the high, away from the area (extreme weather conditions are then produced)

Question 5

What is fog

Answer 5

Conditions of tiny water droplets suspended in the atmosphere

Question 6

What are the two main types of fog

Answer 6

Radiation fog and advection fog

Question 7

When does radiation fog form

Answer 7

Under clear night skies when a moist atmosphere cools through the radiation of heat from the ground surface

Question 8

How does radiation fog form

Answer 8

The cooling extends some distance above the ground surface and is encouraged by light winds that allow slight mixing of the air - it is cooled to dew point and condensation occurs

Question 9

When is radiation fog common

Answer 9

• in winter as maximum cooling is allowed

- temperature inversions (in valleys)

Question 10

Why does radiation fog occur under temperature inversions

Answer 10

Clear skies and high humidity- the air in the upper slopes chills more quickly than that in the valley bottom. Cooling increases the density of the air, and it begins to downslope. The cooler air at the bottom pushes the warmer air upwards. The cold air now at the bottom will cool to its dew point, and create a dense fog that can last all day, and cause a severe frost.

Question 11

When does advection fog form

Answer 11

When a mass of relatively warm air moves horizontally across a cooler surface

Question 12

How is advection fog formed

Answer 12

Air is cooled to its dew point and condensation occurs.

Question 13

Where is advection fog most common

Answer 13

Around coasts and over the sea in summer. In some areas it is sometimes called a fret or haar

Question 14

What happens as the fog moves inland

Answer 14

It is earned and evaporates