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.WHAT CAUSES STORM

 Storms can be caused by the meeting of very cold air with very warm air. 

A storm originates when a low pressure system is surrounded by a high pressure system. Small areas of low pressure can form from hot air rising off hot ground. Hot air will rise, when the hot air collides with cold air, the hot air is forced up over the colder, drier air. 

When the warmer air is displaced upwards, it causes surface air pressure to drop, which creates something of a vacuum effect where the two air masses meet. Cold air then rushes in to fill the area of lower air pressure, and this in turn forces more warm air upwards. This starts a cycle of cold air rushing in, pushing the warm air upwards. It is this very turbulence that causes the storm.