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Severe thunderstorm watch issued for most of GTHA

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Southern Ontario is already under a heat warning, but according to Environment Canada at 3:35 PM EDT Wednesday 11 August 2021 a severe thunderstorm watch is in effect for most of the GTHA including, Hamilton, York-Durham, Halton-Peel and more. During the storm, Canada’s trusted weather source says damaging winds with gusts up to 100 km/h and possibly large hail are possible.

Severe thunderstorm watches are in effect for:

  • Caledon
  • Halton Hills – Milton
  • Newmarket – Georgina – Northern York Region
  • Uxbridge – Beaverton – Northern Durham Region
  • City of Hamilton

Environment Canada says “Conditions are favourable for the development of dangerous thunderstorms that may be capable of producing damaging wind gusts and large hail.”

At the moment Toronto, Mississauga and Brampton have not been included in the severe thunderstorm watch but things can change, and the storm is expected to arrive anywhere between 7:30 pm and 9:30 pm. But as we all know things can change, so visit here for continuous updates on all weather alerts for your region.

Hazards:
Wind gusts of 100 km/h.
Up to ping pong ball size hail.

Timing:
Late this afternoon and this evening.


“Thunderstorms have developed over Michigan and are tracking towards the area. These thunderstorms are expected to arrive late this afternoon. Thunderstorms are expected to move east of the area late in the evening,” reads the warning.

Severe thunderstorm watches are issued when atmospheric conditions are favourable for the development of thunderstorms that could produce one or more of the following: large hail, damaging winds, torrential rainfall.

The Office of the Fire Marshal and Emergency Management recommends that you take cover immediately if threatening weather approaches.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@canada.ca or tweet reports using #ONStorm.

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