Environment Canada has issued a special weather statement for the London area with the possibility of funnel clouds forming.
At 4:30 p.m. the weather agency issued a weather advisory for London, Parkhill, Strathroy, Komoka, and west and east Middlesex County.
The statement said conditions are favourable to generate weak rotation under rapidly-growing clouds or weak thunderstorms.
The weak rotation is normally not a danger near the ground but the weather agency said there is a chance it could intensify and become a weak landspout tornado.
If conditions become more favourable for a tornado, Environment Canada will issue watches and warnings.
Landspout tornadoes do not usually cause significant damage but can still be dangerous, toppling trees, damaging roofs or tossing debris short distances.
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Environment Canada is advising everyone to treat all funnel clouds seriously and to take shelter if one forms.
Funnel clouds usually appear with little or no warning.
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