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'March winds and April showers bring forth May flowers'
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.
Find out more about UV levels and how ozone anomalies may affect them.
The 2018 pollen season was the most severe for more than a decade and the weather is to blame, but could new research offer hope to the 18 million hay fever sufferers in the UK?
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