Fiche de renseignement : changements climatiques et tempêtes

The document details the link between rising global temperatures and the intensification of extreme weather events in Canada, such as hail, windstorms, and hurricanes. It highlights significant insured losses in provinces like Alberta, Quebec, and Ontario, and notes a trend of tornado-prone areas shifting eastward. The text emphasizes the need for improved early warning systems, resilient building codes, and nature-based coastal protections to adapt to these increasing risks.

• Climate change increases the energy available to storms, with conditions favorable for severe convective storms expected to increase by 5% to 20% for every degree Celsius of warming.
• Severe storms cause massive economic losses in Canada; for example, a Calgary hailstorm in August 2024 resulted in over $3.2 billion in insured losses, becoming the second most expensive extreme weather event in the country's history.
• Windstorms are a primary driver of catastrophic losses in Eastern Canada, with windstorms accounting for approximately two-thirds of catastrophic insured losses in Quebec and Ontario between 2008 and 2021.
• Regional projections indicate an increase in severe storms and heavy precipitation in the Prairies and Eastern Canada, with specific risks including increased atmospheric instability in southern Quebec and intensified storms in central Alberta.
• On the Pacific coast, climate change has increased the probability of extreme precipitation events, such as the 2021 British Columbia floods and landslides, by 45% to 60% through the intensification of atmospheric rivers.
• There is an observed trend of tornado and severe wind-affected zones shifting eastward in Canada, potentially increasing risks for high-density population areas in Ontario and Quebec.
• Atlantic hurricanes are intensifying more rapidly; an Atlantic hurricane is now twice as likely to escalate from Category 1 to a major hurricane (Category 3 or higher) in under 24 hours compared to the 1970s and 1980s.
• Adaptation strategies for Canada include updating building codes for wind and hail resilience, implementing government-funded renovation programs, and using nature-based solutions to stabilize coastlines.

APA

Canadian Climate Institute (2025). Fiche de renseignement : changements climatiques et tempêtes. https://institutclimatique.ca/news/fiche-de-renseignement-changements-climatiques-et-tempetes/

Chicago

Canadian Climate Institute. Fiche de renseignement : changements climatiques et tempêtes. 2025. https://institutclimatique.ca/news/fiche-de-renseignement-changements-climatiques-et-tempetes/.

Wikipedia

{{cite report |author=Canadian Climate Institute |title=Fiche de renseignement : changements climatiques et tempêtes |date=22 April 2025 |url=https://institutclimatique.ca/news/fiche-de-renseignement-changements-climatiques-et-tempetes/ |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{canadianclimateinstitute2025fiche, author = {{Canadian Climate Institute}}, title = {{Fiche de renseignement : changements climatiques et tempêtes}}, institution = {Canadian Climate Institute}, year = {2025}, month = apr, url = {https://institutclimatique.ca/news/fiche-de-renseignement-changements-climatiques-et-tempetes/}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }