It forms overnight as the air near the ground cools. When this cooling causes the air to reach saturation, fog will form. The fog first forms near the surface, thickening as the air continues to cool.

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The nights are longer, which allows more time for the temperature to dip and reach the dew point, which is how cool the air must be to become saturated with water vapor and form dew. Fog arises ...

Cuba awoke to thick fog that significantly diminished visibility across various regions of the island, particularly in low-lying areas ...