Snow mushrooms are large accumulations of compacted snow which form in regions subject to heavy snowfalls. A necessary condition is the presence of a supporting structure, such as boulders or tree stumps resulting from felling operations.[1][2] In the absence of wind snow gathers on top of the support, growing to as much as 12 feet in diameter. The physical nature of the snow will change under pressure, and layering produced by freeze/thaw cycles, and it will behave like a very viscous fluid. In places fields of snow mushrooms will form, and if the cold conditions and snowfall persist the weight of accumulated snow will cause it to slowly sag or flow down until the ground level is reached, after which it will spread out from the base, losing the typical mushroom shape. This phenomenon was first reported in a 1902 issue of The Geographical Journal.[3][4]
Snow mushrooms may be seen in temperate, frigid and polar regions around the globe, and wherever there is sufficient snowfall, such as high mountains, at intermediate latitudes.[5][6][7]
^"Winter in Michigan - Winter Mushrooms Tahquamenon Falls State Park". Michigan Nature and Landscape Photography, Prints, Canvas, Stock Photos. Retrieved 2 March 2019.
^"Photographic image : snow mushrooms". Scontent.fjnb6-1.fna.fbcdn.net. Retrieved 23 March 2019.
^C. David Whiteman; Rolando Garibotti (2013). "Rime Mushrooms on Mountains : Description, Formation, and Impacts on Mountaineering". Bulletin of the American Meteorological Society. 94 (9): 1319–1327. Bibcode:2013BAMS...94.1319W. doi:10.1175/BAMS-D-12-00167.1.
^Roberts, L, Jeff. "Mushrooms canada". Retrieved 22 November 2021.
^"Snow village, a farm turns fairy tale world in Heilongjiang". Chinadaily.com.cn. Retrieved 2 March 2019.
^Laskow, Sarah (4 January 2017). "How a British Geographer Discovered Giant Snow Mushrooms in Canada". Atlas Obscura. Retrieved 2 March 2019.
^"Great Divide Nature Interpretation - Nature Notes: What's with all the Snow Mushrooms on the Fenceposts?". Greatdividenaturenotes.blogspot.com. 9 March 2017. Retrieved 2 March 2019.
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