From Montana through the Texas Coast, there is a large area under dense fog advisories Tuesday morning. Drive safely following the steps below.

Fog can develop anywhere in the United States and there are 6 types of fog: Radiational, advection, steam, upslope, precipitation, and freezing fog.

The most common type of fog is radiation or radiational fog. It forms at night and dawn when the sun’s energy ends and the temperature and dew point meet. Most of the time the sky is clear, and if the ground is moist, it is easier for the cloud to form near the surface becoming denser.

Fog can obstruct visibility, making driving particularly dangerous. Here are some tips to consider if you are driving and encountering foggy conditions.

If you need to stop, make sure to pull away from the road and turn your emergency lights on.