A gray layer of dense fog creates a cloudy weather character in the lowlands. Some of you may be wishing the high fog would turn to snow. This transformation already exists and can be observed today. It is based on the “nourishing seed” effect.
High fog alone is not enough for the “seed feeder” effect. The effect can only begin when snow falls from a layer of clouds above the high fog. Snowflakes fall from the upper cloud layer (“seeder” in German “seeder”) into the fog high below (“feeder” in German “feeder”). High fog consists largely of supercooled (below 0 degrees) water droplets. Various processes cause snowflakes to grow at the expense of fog droplets. For example, supercooled water droplets freeze directly onto falling snowflakes. At low enough temperatures, fog droplets also evaporate. The resulting water vapor in turn causes snowflakes to grow. As a result, snow under high fog falls more densely and in larger flakes. High fog dissipates partially or completely as it loses moisture. It turned into ice.
Seeder feeder in progress
Snow began falling in the Geneva area this afternoon and intensified thanks to the “feeder seed” effect. Snowfall is currently spreading towards the northeast, for example in Bern, Grenchen and Basel. Several centimeters of fresh snow is expected to fall in some areas by Wednesday morning.
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