Typhoons occur at sea near the ecuator. It is easy for convections to occur at tropical zones where water tempereture of sea level is hot. the cumulnimbuses occur by convections. They build a whirl; the atomospheric pressure comes down nearby the center of whirl, and it becomes a tropical depression which exceeds the wind velocity 17m/s. This is that we call ''a typhoon'' forms.
The delopment term, occur before a typhoon. A typhoon is developed by stream, sapplied water level at a hot temperature. The centeral atmospheric pressure rapidly goes down while the wind velocity nearby the center suddenly becomes strong.
In the third stage is called ''the golden age" forms and reaches it is the strongest. A typhoon goes northward, and the wind velocity grandually becomes weak. However, whirl levels will expand.
Fourth is the depression term where in a typhoon will change into the tropical depression and the extratropical where a typhoon cyclone while it reaches nearby Japan where the water tmperature of sea is lower than tropical zone.
It a typhoon will there into an extrotropical cyclone when the cold wind from the north affects it. By that time, the wind velocity already passed the peak nearby the low pressure area. But whirlwinds will expand, so disaster strikes in places which are far from the center of low pressure. On the other hard, a typhoon decays and changes the tropical depression. In that case, the maximum wind velocity becomes under 17m/s, that is why sometimes it rains heavily. Be careful about it! typhoons, which approach Japan, mainly are in the golden age and the depression term.
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