What is a tropical depression?

A strong tropical depression develops into a storm when the tropical pressure develops strongly enough accompanied by wind and water vapor from the sea. However, there are also cases of low pressure weakening and dissipating, creating only slight changes in weather.

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So, you already know what a tropical depression is, right?

Features of tropical depression

A tropical depression is considered a vortex, with a diameter of up to hundreds of kilometers, formed mainly over areas with hot climates such as tropical seas. Atmospheric pressure in the storm will be much lower than in the surrounding areas (less than 1000mb).

When a tropical depression is strong enough with wind and water vapor, it will form a tropical storm. Tropical storm, when inland, will cause floods, thunderstorms and many other harms to people’s lives.


And many people often confuse tropical pressure with tropical storm because of their characteristics when inland. However, tropical depressions are usually lighter, with cyclonic winds of level 6 to 7 or about 63km/h, and tropical storms from level 8 to 13 or strong winds of 64km/h. However, not all tropical depressions will form storms, there are tropical depressions that will weaken, gradually dissipate and create light thunderstorms.

Causes of tropical depression

Causes for the formation of tropical depressions include conditions on the surface of the atmosphere such as pressure, temperature, water vapor, wind, etc. Therefore, tropical depressions often appear in hot climates. , ocean or tropical sea.

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As an area of ​​air heats up neighboring areas, the pressure decreases, leading to the draw of air from the higher-pressure sides and uplift (producing water vapor). Due to the influence of the Coriolis force – the deflection force due to the rotation of the Earth, the wind direction is drawn to the center of the low pressure, forming a vortex.

In the Northern Hemisphere, the wind direction deviates to the right, creating a tropical anticyclone. In the southern hemisphere, the Coriolis force causes the wind direction to deviate to the left compared to the direction of motion to form a tropical cyclone. And the change of wind direction in opposite directions in the two hemispheres has formed electrical disturbances in temperate climates, creating a tropical depression.

Effects of tropical depression

Although it is possible to predict a tropical depression before it hits the shore, the tropical depression still causes many harms to people and people:

Causing human casualties

Tropical depression with strong winds near the center of the storm accompanied by heavy rain, tornadoes will cause flooding and human casualties. Especially for people living on the sea, going fishing far from the coast, encountering these tropical pressures will be extremely dangerous.


Polluting the environment

In addition to the loss of life and property, tropical depressions and storms also pollute the environment. The rising flood water will lead to waste from the environment, dead plants and animals soaked in water, making the environment severely affected. Therefore, to ensure, you need to clean the living area regularly to avoid infectious diseases from the environment.

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Causing shortage of food, clean water for daily life

Tropical depressions in the East Sea cause sea level rise, affecting freshwater resources. In addition, the heavy rain caused floods, making it impossible for people to travel, causing food shortages.


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