Clouds and Fog

High clouds

6 km small amount H20 vapor + low temps due to altitude, Thin and white, composed of ice crystals

Cirrus Clouds

Cirrocumulus

Cirrostratus

Middle Clouds

2-6 km composed of liquid H20 vapor

Altostratus clouds mean changing weather

Altocumulus clouds mean settled weather

Altostratus

Altocumulus

Low clouds

2 km sometimes occur as individual clouds but more often appear as general overcast are widespread and associated with somber skies and drizzly rain

Stratus

Stratocumulus

Nimbostratus

Vertical Clouds

low bases that extend to heights as high as 15 km indicate very active vertical movements in the air

Cumulus

Cumulonimbus

Fog

Fog- a cloud on the ground

Radiation fog- results when the ground loses heat through radiation usually at night

Advection fog- when warm, moist air moves horizontally over a cold surface, such as snow-covered ground or a cold ocean.

Evaporation fog- water vapor is added to cold air that is already near saturation

Upslope fog- created adiabatic cooling occurs when humid air climbs a topographic slope.