Canada history
Tornadoes in Ontario
Ontario averages 12-18 tornadoes per year. Here is the complete history.
The stats
- Average: 12-18 tornadoes/year.
- Peak season: June-August.
- Regional patterns.
- Community awareness.
- Skywarn or equivalent spotter network active.
Notable events
- 1953 Sarnia F4 — 7 dead.
- 1985 Barrie F4 — 12 dead. Deadliest modern Ontario tornado.
- 2005 Fergus F2 — significant urban impact.
- 2011 Goderich F3 — 1 dead. Direct hit on lakeside town.
- 2018 Ottawa-Gatineau outbreak — multiple EF3, no deaths despite metro hits.
- 2020 outbreak events — multiple.
- 2024 outbreaks — continued activity.
Major cities
Toronto GTA
6.4M. Occasional events.
Ottawa
1M. 2018 outbreak legacy.
Hamilton
575k.
London
450k. Sarnia-adjacent.
Kitchener-Waterloo
600k.
Windsor
235k. Directly across from Detroit.
Barrie
150k. 1985 F4 legacy.
Sarnia
75k. 1953 F4 legacy.
Weather service coverage
Environment Canada Ontario Storm Prediction Centre
Toronto-based.
Coordination
Weather offices coordinate with regional emergency management.
Preparedness
- Weather radio.
- Wireless alerts enabled.
- Family communication plan.
- Community shelter awareness.
- Storm shelter or basement.
- Insurance current.
- Regular drills.
- Emergency contact list.
For residents
- Preparedness essential.
- Local forecast office familiarity.
- Community engagement.
- Multi-hazard awareness.
- Family plan.
- Insurance verification.
- Ongoing education.