Environment Canada has issued a special weather statement for London, Ont., and nearby areas, warning of strong wind gusts.
Meteorologists say wind gusts of 80 to 90 km/h and up to 100 km/h are possible Sunday morning and afternoon.
They say widespread power outages are possible.
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Environment Canada is calling for a high of 18 C and a low of -1 C on Sunday in London.
Londoners can expect mainly cloudy skies with showers and risk of a thunderstorm.