YELLOW WATCH – SEVERE THUNDERSTORM WATCH for Brockville – Prescott, Mallorytown – Gananoque, Kemptville – Merrickville, Charleston Lake – Westport

Brockville – Environment Canada has issued a YELLOW WATCH – SEVERE THUNDERSTORM WATCH for Brockville and Leeds & Grenville.

Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts, large hail and heavy rain.

2:53 PM EDT Wednesday 1 July 2026

• Impact Level: Moderate
• Forecast Confidence: High

What:

• Wind gusts up to 100 km/h.
• Ping pong ball sized hail.
• Heavy rain, possibly exceeding 40 mm.

When:

• This afternoon and evening.

Additional information:

• Thunderstorms may develop quickly and bring strong winds, hail and heavy rain.

There is a risk of injury.

When thunder roars, go indoors! Lightning kills and injures Canadians every year.

Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches.

Strong wind gusts can damage trees, buildings and overturn vehicles. Large hail can cause significant damage and injury. 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 ONstorm@ec.gc.ca or post reports on X using #ONStorm.

For more information: ontario.ca/page/be-prepared-emergency.