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Dew & Fog

Dew & Fog

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Dew & Fog. Water Cycle. Evaporation, transpiration + condensation Evaporation rate greatest at equator. Dew Point vs. Dew. Air can hold water vapour = humidity. Dew Point vs. Dew. Absolute Humidity – amount of water vapour in the air Relative Humidity - % of water in the air. - PowerPoint PPT Presentation

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Page 1: Dew & Fog

Dew & Fog

Page 2: Dew & Fog

Water CycleEvaporation, transpiration +

condensation

Evaporation rate greatest at equator

Page 3: Dew & Fog

Dew Point vs. DewAir can hold water vapour =

humidity

Page 4: Dew & Fog

Dew Point vs. DewAbsolute Humidity – amount of

water vapour in the air

Relative Humidity - % of water in the air

Page 5: Dew & Fog

Dew Point vs. DewWhen the air cannot hold anymore

vapour it is 100% saturated

This is the Dew Point

Page 6: Dew & Fog

Dew Point vs. DewAt the Dew Point – water vapour

condenses

Warmer the air temperature, higher the dew point

Page 7: Dew & Fog

Dew Point vs. DewCondensed water vapour = dew

When it freezes = frost

Page 8: Dew & Fog

FogWhen air close to the ground cools

enough & reaches the dew point

Water vapour can form a low cloud

Radiation Fog & Advection Fog

Page 9: Dew & Fog

Radiation FogForms during cloudless & windless

nights

low lying fog

Page 10: Dew & Fog

Radiation FogAt night, ground cools rapidly

Cools the air

Air reaches dew point, condenses into fog

Page 11: Dew & Fog

Advection FogNeeds air to be moving (wind)

Warm, moist air moves over a cool surface (snow or water)

Page 12: Dew & Fog

Advection FogCan cause problems in Vancouver,

Victoria, Seattle, San Francisco