Clouds

By: Tarryn

Upper Level Clouds

  • Cirrus, Cirrocumulus, Cirrostratus
  • thin, white, and composed of ice crystals
  • small amount oh H2O vapor and low temps. at such high altitudes
  • 6 Km (freezing point)

Middle Level

  • 2-6 Km
  • composed of liquid H2O
  • Alto Cumulus-indicate settles weather
  • Alto Stratus-indicate changing weather

Lower Level Clouds

  • 2 km
  • sometimes occur as individual clouds
  • more often look like general overcast conditions
  • often widespread and associated with somber
  • skies and drizzly rain
  • Stratus(general overcast), Stratocumulus, Stratonimbus(rain)

Vertical Clouds

  • low bases with heights of as much as 15 km
  • indicate very active vertical movement in the air
  • Cumulus- puffy with vertical movement
  • Cumulonimbus-bring storms

Radiation Fog

  • results when the ground loses heat through radiation usually at night
  • ground is warmer than the air as it warms the and increases the dew point air cools due to the loss of radiation
  • the due point is reached and a cloud/or fog is formed

Advection Fog

  • when warm, moist air moves horizontally over a cold surface
  • such as snow covered ground or a cold ocean current (sea to land)

Upslope Fog

  • created by adiabatic cooling when humid air climbs a topographic slope

Evaporation Fog

  • when water vapor is added to cold air that is already near saturation