The typhoon can predict, but
its strength is often not allowed, the front landing? Partial or temporary
change direction a little? We are impossible to predict accurately.
When we were young know from geography book
typhoon in the tropical ocean, the sea due to the direct sun in the sea
temperature rises, the sea is easy to evaporate into water vapor dispersed in
the air, so the tropical ocean air temperature, humidity, such air due to high
temperature and expansion, resulting in a density decrease the quality
alleviate weak wind near the equator, so it is easy to rising convection occurs
while the surrounding cooler air into the supplement, and then rise again, so
continuous cycle, the end will make the whole column are the higher
temperatures, lighter weight, smaller density of air, which formed the
so-called tropical low pressure. However, the flow of air from high air
pressure flows to low pressure, like water from a height to a lower position,
air pressure higher at four weeks of air will lower the air pressure at the
flow, resulting in a "wind". In the summer, because of the direct sun
area from the equator to move northward, resulting in the southern hemisphere
of the southeast trade winds across the equator steering invade northern
hemisphere southwest monsoon and the northeast trade winds meet the original
northern hemisphere, forcing more crowded this air rises, increasing the
convection again the direction of the southwest monsoon and the northeast trade
winds, the encounter often caused fluctuations and vortex. The southwest
monsoon and the northeast trade winds meet the convergence of cooperation with,
and continue original convection has formed a vortex of low pressure continues
to deepen, the ambient air to accelerate to the center of the vortex flow,
flows into the faster it gets its wind speed; maximum wind speed near the
ground to reach or exceed 17.2 meters per second, we call it the
"typhoon".
The natural disasters chance is very slim, so
Hong Kong it is a blessed land. But the important problem is Hong Kong is
located near the equator, and therefore vulnerable to typhoons. The typhoon will
make Hong Kong’s traffic is blocked, transactions in the market is held in
abeyance, and even trees blown down by the typhoon, pressing through the
passers-by, so that they injured. Therefore, schools need to teach students
some basic precautions. At the same time, the government should also step up
publicity efforts to the public a clear understanding of the harm brought on by
Typhoon.