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Find out the difference between rain and showers and the difference it might make to your day.
Thunderstorms develop when the atmosphere is unstable - this is when warm air exists underneath much colder air. As the warm air rises it cools and condenses forming small droplets of water.
Many different types of rain-gauge have been designed and used, most consisting of a circular collector, delineating the area of the sample, and a funnel that channels the collected rain into a measuring mechanism.
Take care when travelling in heavy rain, wind and thunderstorms.
Please note that when changing units, only forecasts and maps will be affected.