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Tropical storms

Intense low pressure weather systems with heavy rain and strong winds that spiral around the centre. They have a few different names (hurricanes, typhoons, and cyclones±)


When do tropical storms develop?

They develop between 5 and 30 degrees north and south of the equator when:
* sea temperature is 27 degrees celsius.

*wind shear between higher and lower parts of the atmosphere is low.


Wind shear

the difference in wind speed


Describe the centre of the storm

The centre of the storm is called the eye
its up to 50km across and it is caused by descending air.

There's very low pressure, light winds, no clouds, no rain and a high temperature in the the eye.


Describe the eyewall

the eyewall surrounds the eye of the storm, where there's spiralling rising air, very strong winds (around 160 km per hour ), storm clouds, torrential rain and low temperature.


Describe the edges of the storm

Here the wind speed falls, the clouds become smaller and more scattered the rain becomes less intense and the temperature increases.


Typhoon Haiyan fact file

Date: 8 november 2013
The worst affected areas were Tacloban and Cebu, with up to 280mm of rain and winds reaching up to a maximum of 314 km/hour.

there was a storm surge with waves up to 2.3m, combined with a high tide, meant that Tacloban was hit by waves of up to 5m.


How may climate change affect tropical storms?

global average sea surface temperatures have risen by 09*c since 1880 and are expected to rise more as a result of climate change. Its hard to predict what effect this will have on tropical storms ,but it may affect their distribution, frequency and intensity



Oceans will stay at 27*c or higher for longer each year so theres a longer period when tropical storms can form. This may mean that there are more storms each year