How does snow form

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For snow to form you need two things. An atmospheric temperature below freezing and sufficient moisture in the air. The process begins with the formation of ice crystals. When the air temperature is below freezing, water vapour that would normally condense into cloud droplets will change directly into ice without ever becoming a liquid, forming around tiny particles in the air, such as a grain of sand or soot. As these ice crystals form, they grow as more water vapour freezes onto their surface and they collide with other crystals as they move within the cloud. As they grow the crystals become snowflakes, which are heavy enough to fall from the cloud If the snowflakes pass through warmer air as they fall, they will begin to melt, turning to either sleet or rain. Snowflakes that fall through moist air that is slightly above 0°C clump together easily forming the “classic” large fluffy flakes. Snowflakes that fall through really cold and dry air become powdery and don’t stick together as easily creating the perfect ‘powder’ snow for skiing. Once on the ground, snow will remain if the air and ground temperatures are cold enough to keep it from melting. • You may also enjoy: • – Podcasts exploring weather and climate • Weather climate podcast series • – Daily weather forecasts • UK national weather forecast • – Deep dive in-depth forecasts • Deep Dive Forecast UK • Make sure you subscribe so you never miss a single lesson about the weather or climate https://www.youtube.com/c/MetOfficeLe... • We are the Met Office, the UK’s national weather service, and every day of the week we bring you a morning weather forecast and an afternoon weather forecast so that wherever you are in the UK we have you covered. Forecasts and any weather warnings are accurate at time of recording. • To ensure you have the most up to date weather information, check the hourly forecast and live warnings on the Met Office website or app.

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