About Thunderstorm


About Thunderstorms


Vietnam locates in the center of Asian thunderstorm-area, that is one of the three thunderstorm centers where recorded many heavy thunderstorm-activites. Thunderstorm season in Vietnam lasts fairly long, it starts quite soon and ends pretty late. The average number of thunderstorm days is about 100 days per year and duration is about 250 hours per year in average. On this layer that has relatively strong thunderstorm activites, there is a quite large difference in the level of thunderstorm activity in the regions. There are places with small thunderstorms hours like Cam Ranh (55 hours per year), beside places with thunderstorms hours reach 489 hours per year like A Luoi. This difference can be explained by many different factors including territorial division by high mountain ranges with different directions, have the effect of enhancing thunderstorm activities in one side and restricting thunderstorm activities in other side. Highly active areas are areas that have strong atmospheric turbulence and a favorable topography for the cyclones genesis.


     In addition to the beneficial effects of thunderstorms such as providing rainwater, the ability to provide nitrates of lightning discharges gives agriculture a rich source of nitrogen, thunderstorms also have a negative impact on the socio-economy. Thunderstorms can cause flooding (prolonged frontal thunderstorms), and lightning is often a threat to human and property. In recent decades, many infrastructures, power transmission lines, warehouses, post and telecommunications equipment, scientific research equipment and electronic equipment have been damaged by lightning, causing great damage; In addition to economic damage, lightning also causes damage to people, causing panics in some localities such as Co Dung commune (Hai Duong), Dong Anh district (Hanoi), Mekong Delta ...

     In the field of lightning protection, most of Vietnam uses imported lightning protection devices. The effectiveness of many new methods is still unclear, and many of them have even undesirable consequences. Many foreign companies advertise equipment with technical documentation containing unorthodox information, just for the advertisement purposes. The current lightning protection procedures have outdated points that need to be reviewed and modified. Consulting should be promoted.  In general, the study of our country is thunderstorms is still at an early stage, and is now inferior to developed countries. Data on thunderstorm activities in our country are not sufficient and not reliable enough to meet current practical needs.

 


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