WUCN11 CWTO 050046

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 8:46 P.M. EDT MONDAY 4 MAY 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

=NEW= WATFORD - PINERY PARK - EASTERN LAMBTON COUNTY

      SARNIA - PETROLIA - WESTERN LAMBTON COUNTY.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 9:30 P.M. EDT.



AT 8:46 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

SEVERE THUNDERSTORM CAPABLE OF PRODUCING VERY STRONG WIND GUSTS, UP 

TO NICKEL SIZE HAIL AND HEAVY RAIN.



A LINE OF SEVERE THUNDERSTORMS WAS LOCATED FROM NEAR SARNIA TO NEAR 

DRESDEN, MOVING EAST AT AT 75 KM/H. 



HAZARDS: 

- UP TO 90 KM/H WIND GUSTS. 

- UP TO QUARTER SIZE HAIL. 

- HEAVY RAINFALL. 



LOCATIONS IMPACTED INCLUDE: 

SARNIA, PETROLIA, OIL SPRINGS, BRIGDEN, WILKESPORT, BENTPATH, 

COURTRIGHT, OIL CITY, CORUNNA, BECHER, WYOMING, POINT EDWARD, 

DRESDEN, REECES CORNERS, INWOOD.



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

SHELTERS OR TREES IS LIKELY. LARGE HAIL MAY CAUSE SIGNIFICANT DAMAGE 

AND INJURY. 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 X USING (HASH)ONSTORM. 



FOR MORE INFORMATION: 

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



HTTP://WEATHER.GC.CA



END/OSPC