THUNDERSTORM: Granby – Waterloo area
yellow warning – severe thunderstorm – in effect
Issued: 6:45 PM EDT, Thursday, August 13, 2026
Expires: 8:24 PM EDT, Thursday, August 13, 2026
Urgency: Immediate
Severity: Moderate
At 6:45 p.m. EDT, a severe thunderstorm is located over Val-Maher. This severe thunderstorm is moving southeast at 40 km/h. Strong wind gusts, up to quarter size hail and heavy rain are possible.
Locations and nearby areas that could be impacted include: Granby, Yamaska National Park, Bromont, Lac-Brome, Stukely-Sud
Driving conditions will likely be difficult. Heavy rain may cause flash flooding and significant reductions to visibility.
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.
SQUALL: Cornwall to Montréal
squall warning in effect
Issued: 6:04 PM EDT, Thursday, August 13, 2026
Expires: 9:00 PM EDT, Thursday, August 13, 2026
Urgency: Immediate
Severity: Severe
Squalls with wind gusts up to 65 km/h, frequent lightning, hail and poor to very poor visibilities due to showers at times heavy 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.
Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately. Consider delaying or postponing travel in areas under the squall warning. If you must travel, keep others informed of your planned route and carry appropriate safety equipment including a GPS and satellite phone or marine radio.
