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In mid-latitudes, what surface weather is associated with a stationary high pressure region over land in the winter?
  • A
    NS with continuous rain.
  • B
    A tendency for fog and low ST.
  • C
    Thunderstorms.
  • D
    Snow showers.

Refer to figure.
HIGH PRESSURE SYSTEM/ANTICYCLONE. Is an area which has a higher air pressure than the surroundings (the value of the isobars decrease with distance from the centre). Isobars are more widely spaced than with depressions.
Within an anticyclone, at high altitude we have air converging, then descent of air within the anticyclone (subsidence) and divergence at the surface. Typical weather in an area under the influence of a High-Pressure is clear skies due to the sinking motion of air (subsidence), lighter winds than around a Depression and reduced chance of precipitation.

Weather associated with High Pressure Systems:

  • Summer (and cold high pressure systems in winter):

- CLOUD: none except on the edge of the anticyclone
- PRECIPITATION: none
- VISIBILITY: Generally moderate with haze
- TEMPERATURE: Dependent on type
- WINDS: Light

  • Winter (warm anticyclones):

- CLOUD: Extensive stratus with a low base and limited vertical extent.
- PRECIPITATION: Possibly drizzle
- VISIBILITY: Generally moderate to poor with mist and fog likely
- TEMPERATURE: Relatively warm
- WINDS: Light

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