12:07 p.m. EDT Wednesday 12 August 2026

Impact Level: Moderate

Forecast Confidence: High


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

What:
Wind gusts near 100 km/h.
Toonie sized hail.
Heavy rain in excess of 60 mm.

When:
This afternoon into this evening.

Additional Information:
The highest rainfall amounts are expected for areas that receive multiple thunderstorms.

Local utility outages are possible. Fast-moving and rapidly rising water can sweep vehicles away and damage infrastructure.

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

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

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 social media using #ONStorm.

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

In effect for:

• Pickering - Oshawa - Southern Durham Region