How does fog form?

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BRIDGEPORT, W. Va. (WDTV) - You may have been waking up early lately and have been greeted with fog for your morning commute.

What is fog and how does it form? Well, we will answers those questions right now.

Well fog is closely tied to dew points.

The dew point the temperature at which the air becomes 100% saturated. At that point, air condenses into water droplets. We see those droplets as fog.

There are two types of fog: radiation and advection. We here in the Mountain State deal with radiation fog. This is also the most common type.

During the day, the sun warms up the ground which in turn warms up the air near the ground. However, overnight the temperatures fall towards and sometimes to the dew point. Once the temperature meets the dew point, the air is totally saturated and fog forms.

We often see the most fog forming in places like Elkins or in other valleys. Why is that?

Well, cold air is more dense so it sinks, It continues to sink and pool into the valleys. The colder air makes it easier to reach the saturation point.

The best conditions for fog to form are clear, calm nights.

Breeze helps to mix down the drier air from the higher altitudes and the clouds act as a blanket to keep the heat from radiating away.

If you do wake up to fog though, don't worry. Once the sun rises it will start to warm temperatures up and melt that fog away.