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Snow forms when temperatures are low and there is moisture in the atmosphere in the form of tiny ice crystals.
Fog is one of the most common weather conditions in the UK, particularly throughout autumn and winter, but do you know when fog becomes mist, or how you can catch fog?
Find out more about UV levels and how ozone anomalies may affect them.
The weather forecast is a key element of the pilot's pre-flight checks and flight crew will continually update their weather information throughout a flight.
Please note that when changing units, only forecasts and maps will be affected.