Public Weather Alerts for Canada,,, N.Ontario and South Ontario http://weather.gc.ca/warnings/index_e.html

Ontario - northGeraldton - Manitouwadge - Hornepayne

• Frost

  Greater Sudbury and vicinity

• Tornado

• Severe thunderstorm

 Kapuskasing - Hearst

• Frost

  Kirkland Lake - New Liskeard - Temagami 

• Severe thunderstorm

• Severe thunderstorm

Lake Nipigon - Wabakimi

• Frost

  Manitoulin - Blind River - Killarney

• Tornado

• Tornado

 North Bay - West Nipissing

• Tornado

• Severe thunderstorm

• Severe thunderstorm

Timmins - Cochrane

• Frost

  Ontario - southBurk's Falls - Bayfield Inlet 

• Severe thunderstorm

 Huron - Perth 

• Tornado

 London - Middlesex

• Tornado

• Tornado

 Sarnia - Lambton 

• Tornado

• Tornado

Any source