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Halloween isn't far off – here are four of Canada's spookiest kinds of weather

Saturday, October 23rd 2021, 8:28 pm - Canada's weather can take on a foreboding edge when the days get shorter and the nights grow colder.

Fall – not the coldest time of year, nor the darkest, but it can be the spookiest!

A lot of that has to do with the way the weather changes, adding to an already forbiding atmosphere, particularly around Halloween.

We asked viewers to Tweet us their favourite scary fall weather types. Here are the top four.

MOON HALOS

Rachelle Mack Moon Halo UGC Image: Rachelle Mack, View Lake, Ont.

Fall is when those cold nights really start creeping in, and it's when you may catch your first glimpse of this otherworldly phenomenon.

Known as moon halos, or lunar halos, they're most impressive when the moon is full. What happens is, moonbeams shone through millions upon millions of tiny ice crystals in the upper atmosphere, producing that astounding halo effect.

Calling all werewolves!

FOG

Fog Elliot Lake Leslie Karniszewski UGC Image: Leslie Karniszewski, Elliot Lake, Ont.

Fog definitely isn't confined to the fall months, but there's something about the darker and chillier autumn days that gives the fog that certain atmospheric something.

The spookiest appears at night, and it's mostly radiation fog: when the sky is clear, the accumulated daytime heat at the surface radiates outward, leaving behind a surface that is relatively cooler, triggering condensation near ground-level, that appears as fog.

Aside from the spooky feel, it can be dangerous for drivers who don't drive to the conditions. If you're on the roads on a foggy evening, take extra care.

WIND

As with fog, wind is not a rare atmospheric phenomenon, but many of you who Tweeted us listed this as spooky part of the season due to the sound it makes when howling through the trees and streets on a dark night.

Fall is a season of transition, and wind speeds can ramp up as warm and cold air masses duel – and in places like Newfoundland's Wreckhouse region and northern Cape Breton Island, the windiest places in Canada, those gusts can reach damaging levels as well.

WATCH: 160 KM/H WINDS KNOCKED THESE CANADIAN METEOROLOGISTS RIGHT OFF THEIR FEET

SHELF CLOUDS

Bhawna Soi Shelf Cloud Stoney Creek Ontario UGC Image: Bhawna Soi, Stoney Creek, Ont.

Now, HERE'S a scary sight for anyone who sees these clouds bearing down on them.

Known as shelf clouds, they're caused by strong up- and down-drafts, appear at the leading edge of severe thunderstorms, which are still possible in the fall depending on the conditions.

Of everything on this list, they're the most dangerous: they herald the arrival of severe weather, including torrential rain, large hail and, sometimes, tornadoes.

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