Types of fog and why we don't always see it after storms

SOUTH BEND, Ind. -- Fog is common in Michiana during this time of year, and there are different types that form in distinct ways.

Radiation fog usually develops overnight when the ground cools, lowering the temperature of the air above it and causing it to reach saturation. This type of fog requires calm winds and clear skies, especially after rainfall.

Advection fog, however, forms when warm, moist air moves over a cooler surface and condenses. Unlike radiation fog, it can form even in windy conditions.

Steam fog, often seen over the Great Lakes, forms when cooler air moves over warmer water, causing fog to form as the moist air rises. This is most common in fall and winter.

Typically, after a cold front passes, conditions become cooler, calmer, and less humid, often leading to fog. While temperatures are cooler today, the winds have kept radiation fog from forming.

For radiation fog to develop, light winds are needed to allow a temperature inversion near the surface. However, with sustained winds around 10-15 mph and gusts up to 20-25 mph, the air is being mixed too thoroughly for fog to settle in.

Luckily the cold front will provide below average temperatures today and less humidity, providing relief from warm and muggy conditions.