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Lesson 9: Fog
Satellite meteorology is very valuable for identifying fogs. Visible and infrared (both 3.9 and 11 micron images) should be used in combination to locate fog.
Fog Formation
Some clues to look for in satellite images when predicting fog formation:
Look for low level moisture. Moist regions appear as warmer in IR images at night (other things being equal). Prediction of radiation fogs can therefore, occassionally, be aided by enhanced nighttime IR imagery.
Radiation fogs form on clear nights. Use satellite imagery to determine if clouds are moving into or away from the forecast area.
Winter fogs can last a long time, if snow is on the ground and the dew point is above freezing.
Fog Dissipation
Some clues to look for in satellite images when predicting fog dissipation:
Use satellite imagery to determine if clouds are moving into or away from the forecast area.
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