WUCN11 CWTO 122247

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 6:47 P.M. EDT WEDNESDAY 12 AUGUST 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

      HALTON HILLS - MILTON

      MISSISSAUGA - BRAMPTON

      CALEDON

      GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 7:30 P.M. EDT.



AT 6:46 P.M. EDT, A SEVERE THUNDERSTORM IS LOCATED OVER 

CHELTENHAM. THIS SEVERE THUNDERSTORM IS MOVING SOUTHEAST AT 30 

KM/H. STRONG WIND GUSTS, UP TO QUARTER SIZE HAIL AND VERY HEAVY RAIN 

ARE POSSIBLE. 



LOCATIONS AND NEARBY AREAS THAT COULD BE IMPACTED INCLUDE: 

GEORGETOWN, BRAMPTON, BRAMALEA



TAKE IMMEDIATE COVER IF A THUNDERSTORM APPROACHES. IF OUTSIDE, 

PROTECT YOURSELF FROM FLYING DEBRIS AND HAIL. 



SEVERE THUNDERSTORM WARNINGS ARE ISSUED WHEN IMMINENT OR OCCURRING 

THUNDERSTORMS ARE EXPECTED TO PRODUCE DAMAGING HAIL, WIND OR RAIN. 



LOCAL UTILITY OUTAGES ARE LIKELY. WHEN THUNDER ROARS, GO 

INDOORS(EXCLAMATION MARK) LIGHTNING KILLS AND INJURES CANADIANS 

EVERY YEAR. 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