Why is the risk of flash floods higher in October?

Arab Weather - Tomorrow, Wednesday, marks the first of October. October is considered a transitional autumn month during which the chances of flooding increase in many Arab countries.

What are the most prominent weather phenomena that characterize the month of October?

October is considered a transitional month, meaning the transition from the summer and high temperatures to the winter and cold months. This month is characterised by the following weather phenomena:

• Thermal fluctuations between high and low temperatures due to the approach of cooler air masses to the region
• The appearance of low clouds due to the extension of moist air currents from the region
• Fog formation
• The weather gets colder at night due to the long night hours, short day hours and the period of sunshine.
• Light rain showers at times
• Red Sea Low Activity
• Atmospheric instability forms

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October begins with light rain showers in some Levant countries. What areas are included?

Why is the risk of flash floods higher in October?

Scientific reasons

Arab Weather experts explain the scientific reasons that make October one of the months with the highest chances of flooding in many Arab countries. We summarize them as follows:

The approach of cold air masses

In October, cold air masses gradually approach the Arab regions. As they rush in from the north, they collide with warm air masses still present in the south, creating atmospheric disturbances and stimulating cumulus cloud activity and heavy thunderstorms.

Red Sea Low Activity

This month, the so-called Red Sea Low begins to develop due to temperature differences between the Red Sea's waters and the surrounding land. This creates a low-pressure area that stimulates warm, humid air currents toward the Arabian Peninsula, sometimes extending northward.

The Red Sea depression becomes more active when cold air masses approach from the eastern Mediterranean basin and the Levant. This interaction between warm, humid air currents from the south accompanying the Red Sea depression and cold air masses coming from the north leads to atmospheric instability, the formation of cumulus clouds, and thunderstorms, which in some cases can cause flash floods.

high temperature

Air masses coming from the Arabian Peninsula or the deserts of North Africa continue to influence the region during October. These hot air masses significantly raise temperatures, especially during the day. This may coincide with the gradual approach of cold air masses from the north, increasing the likelihood of significant temperature differences in a short period and heightening atmospheric instability.