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The Curious Incident of Snow in the Netherlands

1 Feb 2017, 2:12 pm

[Credit: NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey]

Recently a distinct, odd patch of snow was left over a hamlet in the Netherlands. Only a few dozen fields were covered in a white, thin glaze of snow. According to NASA, “The Netherlands and Belgium were dusted in a freckle-pattern, with white powder covering some fields, while others remained completely bare. The Operational Land Imager (OLI) on Landsat 8 captured a view of this anomaly on January 19, 2017, a couple of days after the snowfall. Those white freckles were signs of a rare and somewhat obscure phenomenon.”

NASA says, “Fog-induced snow (not a formal scientific term) typically forms next to industrial sites. Big chimneys release water vapor and other gases and particulates, which can lead to the formation of fog. It also turns out that these emissions can create snow when the weather gets cold enough.”

A similar phenomenon happened in December 2007. From NASA, “a cold fog over The Netherlands started to develop into a thick stratus cloud. Wim van den Berg, a researcher for MeteoGroup Netherlands, described the event in a 2007 paper: “Mixing within the fog caused the temperature to drop gradually to -4 or -5 degrees Celsius (25 Fahrenheit) throughout the cloud. The temperature decrease caused additional condensation into tiny water droplets but also ice crystals. In such a mixed cloud the Wegener-Bergeron process starts, and ice nuclei grow at the expense of water droplets with small snowflakes as a result…Locally, really large snowflakes were observed and a snow depth resulted of 3–5 centimeters (1.2–2 inches).”

Van den Berg believes this is what also happened a few weeks ago. “After many days with fog and/or low clouds and subfreezing temperatures, on January 17 several places reported snow,” he wrote in an email. “It was very local, mostly west of industry,” as surface wind was light easterly, “but it did cause some unexpected slipperiness.”

More from NASA – http://earthobservatory.nasa.gov/IOTD/view.php?id=89560

For WeatherNation: Meteorologist Mace Michaels

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