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Lothian, ON

Alerts in Effect

Snow Squall Warning

Issued at 10:46 Tuesday 12 December 2017

Persistent snow squalls are expected. Under the snow squall bands, visibilities will be significantly reduced due to the heavy snow combined with blowing snow, and snow will quickly accumulate.

Lake effect snow squalls are expected to persist into Wednesday.

Snowfall amounts near 15 cm per 12 hours are likely in the strongest snow squalls. Whiteout conditions are also possible from blowing snow due to the strong winds gusting up to 70 km/h.

There is potential for these snow squalls to become stationary for several hours at a time this afternoon into Wednesday. If this happens, local snowfall amounts of 30 cm or more are possible in the region, including the City of London.


Snow squalls cause weather conditions to vary considerably; changes from clear skies to heavy snow within just a few kilometres are common. Visibility will be suddenly reduced to near zero at times in heavy snow and blowing snow. Travel is expected to be hazardous due to reduced visibility in some locations. Road closures are possible.

Snow squall warnings are issued when bands of snow form that produce intense accumulating snow or near zero visibilities.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to or tweet reports using #ONStorm.

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