Richard Hammond investigates the role water plays in the weather. He tries to weigh a cloud, finds out how rain could crush a car and starts an avalanche.

Richard Hammond investigates the crucial role temperature plays in all weather. He builds a dust storm to discover how Saharan sand reaches the UK.

Richard Hammond investigates how wind actually starts. He visits one of the windiest places on the planet, walks into the centre of a man-made tornado and creates a 10-metre high whirlwind - made of fire!