Storm & people

The typhoon season usually occurs each year in the tropics, between June and December, when the tropical convergence band is 5-200 miles away from the equator.

Rescuers are trying to save waves that have been hit in the east of the Han River

On average, there are about 70 storms and tropical depressions each year (small storms), 15% of the world's population is directly affected by storms, and property losses amount to billions of dollars.

Storm is a natural phenomenon arranged by countries by year depending on wind power. Level 1 with a maximum wind speed of 50km / hour, the most intense type (level 5) has a wind speed of 250-300km / hour.

Our country is a tropical country. Every year, there are about 10 big and small storms, the strongest wind is 80-100km / hour, but many storms reach 120-130km / hour, especially In the case of over 130km / hr as the typhoon of the Dragon year (1904), the typhoon No. 8 (Cecil) October 16, 1985 caused much damage to Hue, and the storm No. 5 (Linda) 1997 fell into the provinces Southern sea, from Vung Tau - Con Dao to Ca Mau cape caused the biggest damage in the last 100 years. In June to September storms often affect the northern provinces, from September to the end of the year to the southern provinces (from Thua Thien - Hue backwards).

Storm movement is a very important issue for weather forecasters, because it is completely dependent on the surrounding weather system and the system is constantly changing. Science and technology is growing, it is possible to see the ability of a storm to form since a convection cloud, but knowing exactly the direction of movement is still a problem.

Even the recent Hurricane Damrey (No. 7) blew through Hai Nam Island, Guangdong (China) and Vietnam. On the Chinese side, sources said strong winds of nearly 200 km / h, the largest since more than 30 years, damage amounted to $ 1.2 billion. In our case, it is reported only from level 9 to level 12 throughout the length and direction of this storm.

Son Tra - Dien Ngoc coastal route is heavily eroded by spring tide (lunch photos 1-11)

In order for a storm to form, two conditions must be met: one must be above 270C and the second must be wet. At first, hot air collected moisture curled up thanks to the sun's heat. The steam converts into rain, emitting heat, causing the moist air to expand and fly higher, absorbing more steam from below. Heat circles and rising air create a vortex of air.

The main hurricane is a giant whirlwind of tens or hundreds of kilometers with a height of up to 20 km.

An average storm carries more energy than a hydrogen bomb exploded every minute. What can be done to reduce the destructive power of storms, when we cannot control their energy? The best thing we hope to do is watch out for storms.

Now artificial satellites are doing this work very well and promptly notify the storms for us to move, find safe hiding places. However, we cannot prevent or resist storms, but only predictable, preventable to limit minimum damage only.

Because storms require steam, most storms become subdued when inland and within a few days they dissolve. In the future, if the Earth is hotter because of the effect of the greenhouse effect, the number of storms will increase significantly. The temperature in the sea is the main factor that constitutes storms, and if more and more seas with temperatures above 27 ° C, there are more areas to form storms.

WELL