WARNING IN EFFECT: Severe Thunderstorm Warning for Portions of Sorel – Yamaska area, Granby – Waterloo area, Saint-Hyacinthe – Acton Vale area, Brome-Missisquoi area, Saint-Rémi area, Verchères – Beloeil area, Saint-Jean – Marieville area, Hemmingford area, Lacolle area, Longueuil – Varennes area, Laval area, Berthierville – Saint-Gabriel area, Montréal Island area, Rawdon – Joliette area, Châteauguay – La Prairie area, Mascouche area
Issued 6:00 PM EDT, Sunday, August 23, 2026
Impact Level: Moderate
Forecast Confidence: High
At 5:59 p.m. EDT, a line of severe thunderstorms is located from Saint-Alexis to Henrysburg. These severe thunderstorms are moving northeast at 40 km/h. Damaging wind gusts, up to quarter size hail and heavy rain are possible.
Locations and nearby areas that could be impacted include: Montréal, Joliette, Saint-Jean-sur-Richelieu, Sorel-Tracy
Take immediate cover if a thunderstorm approaches. If outside, protect yourself from flying debris and hail.
Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are expected to produce 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.
WARNING IN EFFECT: Severe Thunderstorm Warning for Portions of Sorel – Yamaska area, Granby – Waterloo area, Saint-Hyacinthe – Acton Vale area, Brome-Missisquoi area, Saint-Rémi area, Verchères – Beloeil area, Saint-Jean – Marieville area, Hemmingford area, Lacolle area, Longueuil – Varennes area, Laval area, Berthierville – Saint-Gabriel area, Montréal Island area, Rawdon – Joliette area, Châteauguay – La Prairie area, Mascouche area
Issued 6:00 PM EDT, Sunday, August 23, 2026
Impact Level: Moderate
Forecast Confidence: High
At 5:59 p.m. EDT, a line of severe thunderstorms is located from Saint-Alexis to Henrysburg. These severe thunderstorms are moving northeast at 40 km/h. Damaging wind gusts, up to quarter size hail and heavy rain are possible.
Locations and nearby areas that could be impacted include: Montréal, Joliette, Saint-Jean-sur-Richelieu, Sorel-Tracy
Take immediate cover if a thunderstorm approaches. If outside, protect yourself from flying debris and hail.
Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are expected to produce 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.
THUNDERSTORM: Montréal Island area
yellow warning – severe thunderstorm – in effect
Issued: 6:00 PM EDT, Sunday, August 23, 2026
Expires: 7:58 PM EDT, Sunday, August 23, 2026
Urgency: Immediate
Severity: Moderate
At 5:59 p.m. EDT, a line of severe thunderstorms is located from Saint-Alexis to Henrysburg. These severe thunderstorms are moving northeast at 40 km/h. Damaging wind gusts, up to quarter size hail and heavy rain are possible.
Locations and nearby areas that could be impacted include: Montréal, Joliette, Saint-Jean-sur-Richelieu, Sorel-Tracy
Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are expected to produce damaging hail, wind or rain.
Take immediate cover if a thunderstorm approaches. If outside, protect yourself from flying debris and hail.
THUNDERSTORM: Mascouche area
yellow watch – severe thunderstorm – in effect
Issued: 4:56 PM EDT, Sunday, August 23, 2026
Expires: 2:12 AM EDT, Monday, August 24, 2026
Urgency: Expected
Severity: Moderate
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.
Nautical activities may be hazardous due to sudden, severe wind gusts over bodies of water.
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.
SQUALL: Montréal to Trois-Rivières
squall warning in effect
Issued: 4:52 PM EDT, Sunday, August 23, 2026
Expires: 7:51 PM EDT, Sunday, August 23, 2026
Urgency: Immediate
Severity: Severe
Squalls with wind gusts up to 75 km/h are expected or occurring in the area.
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 squalls. If underway, seek safe harbour immediately.
SQUALL: Richelieu River and Northern Lake Champlain
squall warning in effect
Issued: 4:52 PM EDT, Sunday, August 23, 2026
Expires: 7:51 PM EDT, Sunday, August 23, 2026
Urgency: Immediate
Severity: Severe
Squalls with wind gusts up to 75 km/h are expected or occurring in the area.
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 squalls. If underway, seek safe harbour immediately.
