What weather conditions are typically expected in high-pressure areas during winter?
Refer to figure.
In high pressure areas, the air is subsiding (descending) and flowing outward at the surface. As air sinks in the atmosphere, it becomes compressed, which causes its temperature to rise. This warming occurs as the air descends toward the surface. Because the subsiding air originates from the colder regions near the tropopause, it is also very dry. Consequently, clouds cannot form because cloud formation requires cooling and moisture for condensation to occur.
High Pressure system (Anticyclonic) weather
| Summer (and cold anticyclones in winter): | Winter (warm anticyclones): |
|
Cloud: None except on the edge of the anticyclone Precipitation: None Visibility: Generally moderate with haze Temperature: Dependent on type Winds: Light |
Cloud: Extensive stratus with a low base and limited vertical extent. Fog over land in the autumn and winter. Precipitation: Possibly drizzle Visibility: Generally moderate to poor with mist and fog likely Temperature: Relatively warm Winds: Light |
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