SQUALL: Montréal to Trois-Rivières
squall watch in effect
Issued: 9:49 AM EDT, Thursday, August 27, 2026
Expires: 11:59 PM EDT, Thursday, August 27, 2026
Urgency: Expected
Severity: Severe
This afternoon and evening, conditions will be favourable for the formation of squalls accompanied by gusts of up to 85 km/h and poor to very poor visibility due to the sometimes strong thunderstorms.
Poor to very poor visibility may contribute to voyage delays and make marine navigation hazardous.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.
SQUALL: Richelieu River and Northern Lake Champlain
squall watch in effect
Issued: 9:49 AM EDT, Thursday, August 27, 2026
Expires: 11:59 PM EDT, Thursday, August 27, 2026
Urgency: Expected
Severity: Severe
This afternoon and evening, conditions will be favourable for the formation of squalls accompanied by gusts of up to 85 km/h and poor to very poor visibility due to the sometimes strong thunderstorms.
Poor to very poor visibility may contribute to voyage delays and make marine navigation hazardous.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.
THUNDERSTORM: Montréal Island area
yellow watch – severe thunderstorm – in effect
Issued: 9:48 AM EDT, Thursday, August 27, 2026
Expires: 11:59 PM EDT, Thursday, August 27, 2026
Urgency: Expected
Severity: Moderate
Impact Level: Moderate
Forecast Confidence: High
This afternoon and evening, conditions will be favourable for the development of severe thunderstorms capable of producing strong wind gusts, large hail and heavy rain.
Severe thunderstorms may produce tornadoes.
Nautical activities may be hazardous due to sudden, severe wind gusts over bodies of water.
Damage to roofs, fences, branches or soft shelters is possible.
Heavy rain can cause flash flooding and significant reductions to visibility.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to QCstorm@ec.gc.ca or post reports on social media using #QCStorm.
When thunder roars, go indoors! Lightning kills and injures Canadians every year.
