jääkourut

Jääkourut, commonly known as icicles in English, are formations of ice that hang from surfaces, typically found in cold climates. They form when water, often from melting snow or ice, drips and freezes incrementally. The process begins with water dripping from a point, such as the edge of a roof or a tree branch. As the water hangs in the air, the surrounding temperature causes it to freeze. Each subsequent drip of water freezes onto the existing ice, gradually building the characteristic conical or spear-like shape.

The size and shape of an icicle depend on various factors including the temperature, the rate of water flow, wind, and the surface from which it is hanging. Warmer temperatures can cause faster melting and dripping, leading to longer, thinner icicles. Strong winds can disrupt the freezing process, resulting in more irregular shapes. Icicles are a common sight during winter months and in early spring as snow and ice begin to thaw. While often seen as a beautiful winter phenomenon, large or numerous icicles can pose a hazard. They can fall and cause injury or damage to property. In some cases, the formation of icicles can also indicate underlying issues with insulation or drainage on a building.