Richard investigates the importance of heat - or the lack of it - when it comes to weather. And it isn't just a load of hot air. Without temperature, clouds, rain, snow, dust storms, thunder or lightning would be unable to form. Along the way he builds his own massive dust storm, discovering how sand from the Sahara bounces its way to the UK, and also drops in on a scientist who creates lightning bolts in his laboratory.

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Tags: BBC, Wild, Weather, with, Richard