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1. Ontario tornado frequency: Average number of tornadoes per year per 10,000 km2, based on data from 1950-1979. Source: Newark, 1983
2. Total number of tornado occurrences grouped by Environment Canada public forecast regions, based on data from 1979-2004. Source: Environment Canada, 2009c.
3. All confirmed and probable tornadoes plotted by location, based on data from 1918-2009 (Provincial Overview). Source: Environment Canada, 2011a
4. All confirmed and probable tornadoes plotted by location, based on data from 1918-2009 (Southern Ontario). Source: Environment Canada, 2011a
5. All confirmed and probable weak (F0 and F1) tornadoes plotted by location, based on data from 1918-2009 (Southern Ontario). Source: Environment Canada, 2011a
6. All confirmed and probable significant (F2, F3 and F4) tornadoes plotted by location, based on data from 1918-2009 (Southern Ontario). Source: Environment Canada, 2011a
7. Year of Confirmed and Probable Tornado Occurrence (1918-2009) (Provincial Overview). Source: Environment Canada, 2011a
8. Year of Confirmed and Probable Tornado Occurrence (1918-2009) (Southern Ontario). Source: Environment Canada, 2011a
9. All confirmed and probable tornadoes plotted by location, based on data before 1918 (Southern Ontario). Source: Environment Canada, 2011a
10. Year of Confirmed and Probable Tornado Occurrence (before 1918) (Southern Ontario). Source: Environment Canada, 2011a
Sources
Environment Canada, 2009c. Internal. Data provided courtesy of David Sills, Meteorological Research Branch, Meteorological Service of Canada.
Environment Canada, 2011a. Internal. Data provided courtesy of David Sills, Meteorological Research Branch, Meteorological Service of Canada.
Newark, M.J., 1983. Tornadoes in Canada for the Period 1950 to 1979. Environment Canada, Atmospheric Environment Service, CLI-2-83, Downsview, Ont.
Data from ontario.hazards.ca