Some people might answer: when it blows the roof off your house. The weather men see it differently. ‘Hurricane’ is one of the names given to violent tropical storms. These develop over warm tropical seas and blow up into huge spinning storms of clouds and rain. Hurricanes can be driven by winds reaching speeds of 300 kilometres per hour and can cause terrible damage.
The system used to measure wind speed is called the Beaufort scale. Hurricane is at the top of the scale and is known as force 12. When the wind reaches 122 kilometres an hour, a violent storm of force 11 becomes a hurricane of force 12.
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