Clouds
Surface Based Layers
-Mist and fog are clouds at ground level
-The difference between the two is visibility
-Mist >= 5/8 sm
-Fog < 5/8
Questions (Answers at bottom)
1. What is the difference between mist and fog?
2. Would you have better luck with visibility in mist or in fog?
3. Define Ceiling
4. What is the formula for calculating cloud base?
5. When do clouds form?
6. As pressure decreases, the dew point also decreases. How many degrees per 1000 feet will it decrease?
Quizzes
Answers to Questions
1. Visibility
2. Mist
3. The height of the base of the lowest BKN or OVC cloud layer
4. (Surface Air Temperature – Dew Point Temperature) / 3.0
5. When air is cooled the the dew point temperature
6. 0.5 degrees celsius
IFR Rating 