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Dew, Frost and Fog

Dew, Frost and Fog. Dew. Condensation on surface when temperature falls to the dew point temperature Often occurs on cold, clear nights in areas open to the sky? Why surface emits infrared radiation to space, cooling surface Dew forms when temperature drops to the dew point. Dew.

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Dew, Frost and Fog

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  1. Dew, Frost and Fog

  2. Dew • Condensation on surface when temperature falls to the dew point temperature • Often occurs on cold, clear nights in areas open to the sky? • Why surface emits infrared radiation to space, cooling surface • Dew forms when temperature drops to the dew point

  3. Dew • Often associated with periods when high pressure (a.k.a., an anticyclone) is positioned overhead • Highs are associated with clear skies and calm or weak winds. • Why are weak winds good for dew? Less mixing of warmer air from above!

  4. Car’s in the open can get covered with dewCars in a carport gather little dewWhy?

  5. Dew Protection: Roof Lessens Infrared Cooling to Space

  6. More Dew Facts • More dew after a moist period or in moist areas. Higher dew point! • Dew releases latent heat of condensation and reduces temperature drops after it starts to form

  7. Frost

  8. FOG

  9. Radiation Fog

  10. Ground Fog

  11. Advection Fog

  12. Upslope Fog

  13. Steam Fog

  14. FRONTAL FOG

  15. Average Number of Days with Dense Fog

  16. Foggiest Place in U.S.: Cape Disappointment

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