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How does Extreme weather Happen?
Thunder Storms form when a large temperature difference occurs  in a vertical column in the atmosphere.

Electrical energy begins to build up in thunder clouds as small ice/particles lift higher than larger ones.  The small particles carry a +(positive) charge and the larger ones a - (negative) charge.

Tornado's form when strong updraughts of air rise in a funnel shape. The air touching the earth moves slower than air above H. This causes the air to ' roll over' and get sucked up, rotating through the inside of the cloud

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Water cycle:
The water cycle is the cycle that helps us get water. It consists of evaporation, condensation and precipitation. Evaporation is when water turns into vapour to make clouds. Condensation is when the vapour in the clouds cools and makes water droplets. Precipitation is when the cloud gets big and drops the water drops as rain.

3 common cloud types:
Cirrus, cumulus and stratus. Cirrus is a wispy cloud. Cumulus is a big fluffy cloud. Stratus is a long sheet of thin cloud.

Isobars
Isobars show the air pressure and the wind coming across the land.

Low pressure systems
Warm air rises to the sky and cools in the atmosphere.Cold air rushes to replace it creating a funnel. This cold air condensates in the atmosphere and the precipitates to make rain.

Lightning
Electrical energy begins to build up in thunder clouds as small ice/particles lift higher than larger ones.  The small particles carry a +(positive) charge and the larger ones a - (negative) charge.

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What is It?
Extreme weather is weather that is very harsh and can damage land.

3 examples
- Hurricanes
- Droughts
- Tornados

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Areas of high pressure are marked with an 'H' and this represents ' fine' weather with few clouds. Wind on edge of 'H' can be strong.

Low pressure areas are marked with an 'L'. Low pressure areas force wind inwards. These winds push through the warm air like a funnel and cool air rushes in to replace it. As the warm air rises it cools, forming water vapour and then clouds, ready to rain.

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The lines on weather maps are called 'isobars'. The numbers on the lines show air pressure.

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The weather maps we see on T.V and in the newspaper are called 'surface charts'.
The lines and symbols represent weather patterns on earth.

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The sun warms up the land and sea. This heat radiates upwards As the warm air rises it expands. As it expands, it cools down. The colder air becomes denser and sinks back to the earth. We experience this circulation of air as wind.

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If the temperature in the atmosphere is freezing, the water vapour forms into ice which drops down as hail. Winds push the snow back into the clouds lots of times, breaking it into hail stones

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If the temperature is below freezing in the atmosphere, the drops will stick together to create different types of snowflakes. It is the same as hail except it doesn't get refrozen in the cloud.

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As water vapour evaporates into the air, it forms together to make clouds. When the clouds get to heavy the water vapour drops as rain