SQUALL: Montréal to Trois-Rivières
squall watch in effect
Issued: 9:27 AM EDT, Monday, August 10, 2026
Expires: 1:21 AM EDT, Tuesday, August 11, 2026
Urgency: Expected
Severity: Severe
Conditions are favourable for the development of squalls with wind gusts up to 85 km/h.
Late this afternoon and this evening, conditions will be favourable for the development of squalls with wind gusts up to 85 km/h.
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: 9:27 AM EDT, Monday, August 10, 2026
Expires: 1:21 AM EDT, Tuesday, August 11, 2026
Urgency: Expected
Severity: Severe
Conditions are favourable for the development of squalls with wind gusts up to 85 km/h.
Late this afternoon and this evening, conditions will be favourable for the development of squalls with wind gusts up to 85 km/h.
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: 9:23 AM EDT, Monday, August 10, 2026
Expires: 1:23 AM EDT, Tuesday, August 11, 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, hail and heavy rain.
There is also a risk of a tornado.
Nautical activities may be hazardous due to sudden, severe wind gusts over bodies of water.
Local utility outages are possible. Damage to roofs, fences, branches or soft shelters is possible.
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.
