WWCN11 CWTO 012226

YELLOW WATCH - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 6:26 P.M. EDT WEDNESDAY 1 JULY 2026.

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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:

      DUNNVILLE - CALEDONIA - HALDIMAND

      NIAGARA

      CITY OF HAMILTON

      PICKERING - OSHAWA - SOUTHERN DURHAM REGION

      UXBRIDGE - BEAVERTON - NORTHERN DURHAM REGION

      BELLEVILLE - QUINTE - NORTHUMBERLAND

      KINGSTON - PRINCE EDWARD

      PETERBOROUGH - KAWARTHA LAKES

      STIRLING - TWEED - MADOC.



YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - ENDED FOR:

      CITY OF TORONTO

      SIMCOE - DELHI - NORFOLK

      BRANTFORD - COUNTY OF BRANT

      BURLINGTON - OAKVILLE

      MISSISSAUGA - BRAMPTON

      CALEDON

      VAUGHAN - RICHMOND HILL - MARKHAM

      NEWMARKET - GEORGINA - NORTHERN YORK REGION.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



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 UP TO 100 KM/H. 

UP TO QUARTER SIZED HAIL. 

HEAVY RAIN, POSSIBLY EXCEEDING 30 MM. 



WHEN: 

EARLY THIS EVENING. 



ADDITIONAL INFORMATION: 

A LINE OF STRONG THUNDERSTORMS IS TRACKING OVER SOUTHERN ONTARIO AND 

WILL CONTINUE TO TRACK EAST THIS EVENING.



LOCAL UTILITY OUTAGES ARE POSSIBLE. THERE IS A RISK OF INJURY. WHEN 

THUNDER ROARS, GO INDOORS(EXCLAMATION MARK) LIGHTNING KILLS AND 

INJURES CANADIANS EVERY YEAR. SECURE LOOSE OBJECTS. SEVERE 

THUNDERSTORM WATCHES ARE ISSUED WHEN CONDITIONS ARE FAVOURABLE FOR 

THE DEVELOPMENT OF THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING HAIL, 

WIND OR RAIN. 



EMERGENCY MANAGEMENT ONTARIO 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 IN ONTARIO, SEND AN EMAIL TO 

ONSTORM(AT)EC.GC.CA OR POST REPORTS ON X USING (HASH)ONSTORM. 



FOR MORE INFORMATION: 

HTTPS://WWW.ONTARIO.CA/PAGE/BE-PREPARED-EMERGENCY.



HTTP://WEATHER.GC.CA



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