Mist, Fog, and Haze

Question 1

Visibility of Fog (FG)

Answer 1

< 5/8 SM (1km or less)

Question 2

Visibility of Mist (BR)

Answer 2

5/8 SM or more (1km or more but less than 5km)

Question 3

Clear nights and light wind. Settle in low areas. Dissipates within a few hours after sunrise.

Answer 3

Radiation Fog

Question 4

Drifting of warm damp air over a colder land or sea surface. May persist for days and cover wide areas.

Answer 4

Advection Fog

Question 5

Cooling of air due to expansion as it moves up a slope with light wind to push it up the slope

Answer 5

Upslope Fog

Question 6

Cold air passes over a warm water surface. Evaporation of the water into the cold air occurs until the cold air becomes saturated. the excess water vapor condenses as fog

Answer 6

Steam fog

Question 7

Caused by the addition of moisture to the air through the evaporation of rain or drizzle. Mostly caused by warm fronts (frontal fog)

Answer 7

Precipitation induced fog

Question 8

Forms in moist air during extremely cold and calm conditions. Tiny ice crystals are formed by sublimation.

Answer 8

Ice Fog