THUNDERSTORM: Montréal Island area
yellow watch – severe thunderstorm – in effect
Issued: 10:15 AM EDT, Tuesday, July 28, 2026
Expires: 1:59 AM EDT, Wednesday, July 29, 2026
Urgency: Expected
Severity: Moderate
Impact Level: Moderate
Forecast Confidence: High
Conditions are favourable for the development of severe thunderstorms capable of producing strong wind gusts, hail and heavy rain this afternoon and evening.
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.
Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain.
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. Don't drive through flooded roadways.
SQUALL: Montréal to Trois-Rivières
squall watch in effect
Issued: 10:04 AM EDT, Tuesday, July 28, 2026
Expires: 2:02 AM EDT, Wednesday, July 29, 2026
Urgency: Expected
Severity: Severe
This afternoon and this evening, conditions will be favourable for the development of squalls with wind gusts up to 85 km/h, frequent lightning, hail and poor to very poor visibility due to showers at times heavy.
Proceed with caution as visibility may suddenly be reduced to near-zero.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.
SQUALL: Richelieu River and Northern Lake Champlain
squall watch in effect
Issued: 10:04 AM EDT, Tuesday, July 28, 2026
Expires: 2:02 AM EDT, Wednesday, July 29, 2026
Urgency: Expected
Severity: Severe
This afternoon and this evening, conditions will be favourable for the development of squalls with wind gusts up to 85 km/h, frequent lightning, hail and poor to very poor visibility due to showers at times heavy.
Proceed with caution as visibility may suddenly be reduced to near-zero.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.
