Severe Thunderstorm Watch Issued for Eastern Ontario

Thursday, July 3, 2025, 11:07 a.m.

UPDATE: THE THUNDERSTORM WATCH HAS ENDED

Environment Canada has issued a severe thunderstorm watch for much of Eastern Ontario. While not every area will see a storm, the atmosphere is primed for a few strong ones to develop this afternoon and early evening.

What’s Happening

Isolated thunderstorms are expected to form this afternoon and track southward into the evening. If they do develop, they could bring:

• Wind gusts up to 90 km/h

• Hail around 2 cm in diameter

These storms may pass quickly, but it's worth staying aware and prepared.

Why It Matters

Storms like these can bring brief but powerful impacts. Strong winds may break branches or toss around outdoor items, and hail can dent vehicles or damage gardens and siding.

What You Should Do

There’s no need to panic, just a few basic precautions can go a long way:

• Stay up to date with weather alerts

• Make sure your phone is charged

• Bring in or secure loose items like umbrellas, cushions, or tools

• If you hear thunder, head inside

• If you're driving, watch for sudden heavy rain or strong winds

You can report local storm impacts by emailing onstorm@ec.gc.ca or posting updates using #ONStorm on social media.

More preparedness tips are available at: ontario.ca/page/be-prepared-emergency

Areas Included in This Watch

• Alexandria

  
  

• Belleville

  
  

• Brockville

  
  

• Charleston Lake

  
  

• Consecon

  
  

• Cornwall

  
  

• Eastern Northumberland County

  
  

• Frontenac Islands

  
  

• Gananoque

  
  

• Kemptville

  
  

• Kingston

  
  

• Lancaster

  
  

• Long Sault

  
  

• Madoc

  
  

• Mallorytown

  
  

• Maxville

  
  

• Merrickville-Wolford

  
  

• Morrisburg

  
  

• Napanee

  
  

• Newington

  
  

• Odessa

  
  

• Ottawa

  
  

• Prescott

  
  

• Prescott and Russell

  
  

• Quinte West

  
  

• South Frontenac

  
  

• Stirling

  
  

• Sydenham

  
  

• Tamworth

  
  

• Tweed

  
  

• Westport

  
  

• Winchester

  
  

Stay Informed

This watch was issued by Environment Canada. Even if storms don’t form everywhere, staying aware and ready is the best approach.

Spread the Word, Stay Safe

Storms can come up fast, and not everyone checks the forecast. A simple heads-up could help someone stay dry, or stay safe.

• Text or call friends and family in the watch area

• Share this story in group chats or local forums

• Post updates using #ONStorm

• Check in on neighbours, especially those who might not follow alerts

When thunder roars, go indoors, and help others do the same.

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