Lake Effect Snow
Up next on the list of our favourite weather phenomena for our 25th Anniversary celebrations is Lake Effect Snow!
Lake effect snow is a phenomenon that can be found around the world, but it is primarily associated with the Great Lakes region of North America. During late autumn and over winter, the air over Canada and the northern USA can be very frigid and cold. During this time, the waters in the lakes are still relatively warm and haven’t frozen over. In certain conditions when a low is centred over Canada causing a southerly plunge in the jet stream, the cold air can be blown directly over the relatively warm lakes, causing the air to warm and pick up moisture as it travels overhead. As the clouds grow and rise, the air cools again, condensing the moisture out and freezing it, potentially generating snow [1, 2, 3]. The cloudy snow bands generated by the lake effect are often far longer than they are wide, and residents in the area can often travel through sunny, snowy, whiteout and then back to sunny conditions within 10 miles. Their length on the other hand can travel as far as 100-200 miles in one direction depending on how strong the winds are [1, 2, 3].
Wind direction and strength therefore can have a massive impact on the areas that may be impacted, with northerly winds causing the snow to fall on the southern shores etc. With snowfall rates in the 5 – 7 cm/hour range, and winds not changing direction, it can very easily become a massive risk to locals in the affected areas, causing deep blizzards and snow drifts [3]. One major event to affect the region was called the “October Surprise” in 2006, unusual for its very early occurrence. Cool temperatures and south-westerly squall lines blew across Lake Erie, bringing snow to Buffalo, New York. Despite being one of the snowiest cities in the USA, the seasonally early event caught the city off guard with 27 inches of heavy snow falling, damaging trees, blocking roads and bringing down power lines [4]. The following year, lake-effect snow from Lake Ontario produced 141 inches of snow over a ten-day period in the town of Redfield, New York [1].
Lake effect snow does not only occur in that region, as it can theoretically occur anywhere where the air temperature can get cold enough and there is a large enough lake to create the snow. Even the UK can have something similar, albeit not with lakes, but with the North Sea. Sometimes called ocean- or sea-effect snow, the same premise applies, with very cold air blowing over a relatively warm body of water. When impacting the UK, this air normally comes from the polar continental region of Russia and Northern Europe. As the air reaches the North Sea it picks up the moisture in it and can then potentially dump a load of snow of the UK. This is what is known as a ‘Beast from the East’ in meteorology, and famously back in 2018 it brought eastern parts of the UK to a standstill [3]. Another place that gets this sea-effect snow is Japan, one of the snowiest places on record. Here cold air from the Siberian high blows down through China and over the relatively warm Sea of Japan. It picks up this moisture before hitting the Japanese mountains, dumping it all as snow. This makes Japan extremely popular for skiing and other winter sports [5].
Therefore the sheer levels of snow that can be generated via lake- or sea-effect snow vary greatly and can be a hindrance to local residents, or ideal for holiday-goers and skiers looking for a perfect winter escape!
If you would like to find out more about lake-effect snow, have a read through the references below:
[1] Caitlin Kaiser (2025). What Is Lake-Effect Snow And How Does It Form? Available at: https://weather.com/storms/winter/news/2025-11-07-science-behind-lake-effect-snow-how-it-forms (accessed: 10/06/2026)
[2] National Weather Service (2026). What is Lake Effect Snow? Available at: https://www.weather.gov/safety/winter-lake-effect-snow (accessed: 10/06/2026)
[3] Darren Brett (2025). What is lake-effect snow? Available at: https://www.bbc.co.uk/weather/articles/cx2y6kl3vyzo (accessed: 10/06/2026)
[4] NOAA NESDIS (2025). What Is Lake Effect Snow? Available at: https://www.nesdis.noaa.gov/about/k-12-education/ice-snow/what-lake-effect-snow (accessed: 10/06/2026)
[5] Japan Ski Experience (2025). Why does it snow so much in Japan anyway? Available at: https://japanskiexperience.com/news-and-articles/why-does-it-snow-so-much-in-japan-anyway/ (accessed: 10/06/2026)
