WUCN11 CWTO 022151

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 5:51 P.M. EDT THURSDAY 2 JULY 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

      ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION

      CITY OF HAMILTON.



YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - ENDED FOR:

      BURLINGTON - OAKVILLE.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 7:50 P.M. EDT.



AT 5:51 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WIND 

GUSTS AND VERY HEAVY RAIN.



THUNDERSTORM LOCATION: LINE OF THUNDERSTORMS EXTENDING FROM DUNDAS 

TO LAKE ONTARIO NEAR STONEY CREEK. 



MOTION: MOVING EAST AT 40 KM/H 



HAZARDS: 

WIND: VERY STRONG (90 KM/H) 

HAIL: UP TO QUARTER SIZED HAIL (2.5 CM) 

RAIN: VERY HEAVY (50 - 100 MM), DUE TO THUNDERSTORMS TRACKING 

MULTIPLE TIMES OVER THE AREA. 



LOCATIONS IN THE PATH: 

DUNDAS, HAMILTON, STONEY CREEK, GRIMSBY



LOCAL UTILITY OUTAGES ARE LIKELY. DAMAGE TO ROOFS, FENCES, SOFT 

SHELTERS OR TREES IS LIKELY. TAKE IMMEDIATE COVER IF A THUNDERSTORM 

APPROACHES. IF OUTSIDE, PROTECT YOURSELF FROM FLYING DEBRIS. SEVERE 

THUNDERSTORM WARNINGS ARE ISSUED WHEN IMMINENT OR OCCURRING 

THUNDERSTORMS ARE EXPECTED TO PRODUCE 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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