Learn about the causes of dense and persistent fog during low-pressure systems.

Arab Weather App - Various regions of the Kingdom have witnessed, since the early hours of this morning, a very dense fog formation which has led to an almost complete lack of horizontal visibility, especially over the high mountain peaks, including the highlands of the capital, Amman.

What are the causes of dense fog forming over the mountains during a low-pressure system?

Winter depressions often bring very low clouds that touch the ground, which are stratiform cumulus clouds that are characterized by their low base. When the mountain peaks are at a height close to the base of these clouds, they sink into the cloud itself, and dense fog is formed.

As the flow of humid air towards the mountains increases, and when the air mass becomes saturated with moisture and the air reaches the dew point, water vapor condenses directly in the air, leading to dense fog.

And God knows best.