In Vancouver it's a very rare happening
The unusual weather event is essentially a thunderstorm that replaces the rain with snow says Environment Canada meteorologist Ross Macdonald. The federal agency officially observed it over Vancouver and at the airport early Sunday morning, Dec. 18.
Conditions have to be just right for it, he adds, and in Vancouver both thunderstorms and snow are unusual events.That means an unstable air mass in the atmosphere, along with the right mixture of moisture and cold air, all at once.Few caught it on camera this time around it appears, with only a few clips from security cameras making it to social media.
Along with the thunder and lightning, thunder snow brings thicker bands of snow. Macdonald explains that people may not have seen or heard the thunder or lightning, but still saw the heavy snow that was a part of the weather event.
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