WUCN11 CWTO 110003

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 8:03 P.M. EDT MONDAY 10 AUGUST 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

      MORRISBURG - LONG SAULT

      WINCHESTER - NEWINGTON.



YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - ENDED FOR:

      CORNWALL - LANCASTER.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 10:01 P.M. EDT.



AT 8:02 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WIND GUSTS, UP TO 

QUARTER SIZE HAIL AND HEAVY RAIN.



THUNDERSTORM LOCATION: OVER WILLIAMSBURG 



MOTION: MOVING SOUTHEAST AT 50 KM/H 



HAZARDS: 

WIND: STRONG (UP TO 90 KM/H) 

HAIL: UP TO QUARTER SIZE (UP TO 2.5 CM) 

RAIN: HEAVY (15 - 50 MM) 



LOCATIONS IN THE PATH: 

SOUTH MOUNTAIN, WINCHESTER, WILLIAMSBURG, MORRISBURG, INGLESIDE



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 AND 

HAIL. 



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 SOCIAL MEDIA USING 

(HASH)ONSTORM. 



FOR MORE INFORMATION: 

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



HTTP://WEATHER.GC.CA



END/OSPC