Environment Canada has issued a special weather statement for London, Chatham-Kent, Sarnia-Lambton and Oxford, Elgin and Middlesex counties.
The agency issued the warning shortly after ending a previous warning for Sutton, noting the latest line of thunderstorms is capable of producing very strong wind gusts.
For Saturday, expect mixed skies clearing near noon, northwesterly winds at 20 km/h becoming light, a high of 15 C and low of 6 C. The strongest wind gusts are expected from this afternoon into early this evening.
One thing's for certain, summer certainly isn't going away quietly this year. "Remember, severe thunderstorms can produce tornadoes".
Environment Canada has issued a severe thunderstorm watch for the Region of Waterloo and Wellington County for Friday.
Slightly weaker northwest winds gusting to 70 km/h are also expected this evening after the cold front passes.
Damage to buildings, such as to roof shingles and windows, may occur, Environment Canada stated.
The most blustery gales will happen in thunderstorms as a cold front tracks over Southwestern Ontario, the national weather agency says. To report severe weather, send an email to ONstorm@canada.ca or tweet reports using #ONStorm. "Remember, when thunder roars, go indoors".
For more information: http://www.emergencymanagementontario.ca/english/beprepared/beprepared.html.
Wind warnings are issued when there is a significant risk of damaging winds.