Fog

Question 1

How is Fog caused?

Answer 1

It is caused by cooling of air to a dew point temperature until it becomes saturated then it condenses into minute water droplets.

Question 2

By how much does Fog reduce visibility depending on levels?

Answer 2

• Fog: Reduction below 1000m
• Thick Fog: Reduction below 180m
• Dense Fog: Reduction below 50m

Question 3

How is sea/advection fog formed?

Answer 3

When warm moist air flows over a cold sea surface and cools to its due point.

Question 4

What are the different types of fog?

Answer 4

• Sea/Advection Fog
• Radiation Fog
• Evaporation Fog
• Frontal Fog

Question 5

What two variables do you need to predict if fog will form?

Answer 5

• Sea Temperature
• Dew Point

Question 6

How would you determine if fog will form or not?

Answer 6

We compare the sea temperature with the dew point we got from the differences of wet and dry bulb from NP100.

• If dew point temp is between dry bulb temp and sea temp, fog may form.
• If dew point temp is outside dry bulb temp and sea temp, fog will NOT form.