WUCN11 CWTO 021003

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 6:03 A.M. EDT WEDNESDAY 2 SEPTEMBER 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

      CITY OF TORONTO

      YORK - DURHAM

      COBOURG - COLBORNE - WESTERN NORTHUMBERLAND COUNTY

      LINDSAY - SOUTHERN KAWARTHA LAKES

      PETERBOROUGH CITY - LAKEFIELD - SOUTHERN PETERBOROUGH COUNTY.



YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - ENDED FOR:

      INNISFIL - NEW TECUMSETH - ANGUS

      ORILLIA - LAGOON CITY - WASHAGO

      FENELON FALLS - BALSAM LAKE PARK - NORTHERN KAWARTHA LAKES.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 7:10 A.M. EDT.



AT 6:01 A.M. EDT, A LINE OF SEVERE THUNDERSTORMS IS LOCATED FROM 

CAMBRAY TO LEASKDALE THEN TO NEWMARKET. THESE SEVERE THUNDERSTORMS 

ARE MOVING EAST AT 50 KM/H. STRONG WIND GUSTS, UP TO QUARTER SIZE 

HAIL AND HEAVY RAIN ARE POSSIBLE. 



LOCATIONS AND NEARBY AREAS THAT COULD BE IMPACTED INCLUDE: 

NEWMARKET, LINDSAY, MARKHAM, PICKERING, AJAX, WHITBY, OSHAWA



HEAVY RAIN WITH LOW VISIBILITIES AND GIVING 30 TO 50 MILLIMETRES IN 

LESS THAN AN HOUR ARE THE MAIN HAZARDS THIS MORNING.



TAKE IMMEDIATE COVER IF A THUNDERSTORM APPROACHES. IF OUTSIDE, 

PROTECT YOURSELF FROM FLYING DEBRIS AND HAIL. HEAVY RAIN MAY CAUSE 

FLASH FLOODING AND SIGNIFICANT REDUCTIONS TO VISIBILITY. LARGE HAIL 

MAY CAUSE SIGNIFICANT DAMAGE AND INJURY. 



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 SOCIAL MEDIA USING 

(HASH)ONSTORM. 



FOR MORE INFORMATION: 

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



HTTP://WEATHER.GC.CA



END/OSPC