THE WEATHER BLOG

The Baltimore Sun

Donald Gansauer write from Canton: "Over the years, I've noticed that snowflakes coalesce into much larger flakes just before the snowstorm ends. Why?" The calm after the storm? Large flakes for when temperatures are near freezing, amid light winds with slight updrafts. This allows snow crystals -- especially "dendritic" flakes with fine, spiky arms -- to stick together and grow large, some up to 6 inches wide.

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