Formation of Fog, Introduction

  • Forms as the RH increases to 100% - haze particles grow into fog (cloud) particles near the ground

  • is really a cloud near the ground

  • International definition: Visibility is less than 1 km

  • NWS definition: Visibility is less than or equal to 6 miles and T-Td < 5F

  • Fog in polluted areas can be a health problem since it becomes acidic

Types of Fog:

  1. Radiation Fog

  2. Advection Fog

  3. Upslope Fog

  4. Steam Fog

Let's look at how each of these are formed......