WUCN11 CWTO 182259

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 6:59 P.M. EDT MONDAY 18 MAY 2026.

---------------------------------------------------------------------

YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

=NEW= MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY

=NEW= HANOVER - DUNDALK - SOUTHERN GREY COUNTY

=NEW= OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY

      WATFORD - PINERY PARK - EASTERN LAMBTON COUNTY

      LONDON - MIDDLESEX

      HURON - PERTH

      SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY

      BRUCE PENINSULA - SAUBLE BEACH - TOBERMORY.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 8:57 P.M. EDT.



AT 6:58 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WIND 

GUSTS.



THUNDERSTORM LOCATION: OLIPHANT TO GLENCOE 



MOTION: MOVING QUICKLY TO THE EAST AT 70 KM/H 



HAZARDS: 

WIND: DAMAGING (90 - 110 KM/H) 



LOCATIONS IN THE PATH: 

SAUBLE BEACH 

PARKHILL 

PAISLEY 

WIARTON 

HENSALL 

STRATHROY 

EXETER 

TEESWATER 

WINGHAM 

OWEN SOUND



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

SHELTERS OR TREES IS LIKELY. 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



WUCN11 CWTO 182259

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

ISSUED BY ENVIRONMENT CANADA

AT 6:59 P.M. EDT MONDAY 18 MAY 2026.

---------------------------------------------------------------------

YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

=NEW= BURK'S FALLS - BAYFIELD INLET.



---------------------------------------------------------------------

IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 8:57 P.M. EDT.



AT 6:58 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WIND 

GUSTS AND UP TO QUARTER SIZE HAIL.



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 X USING (HASH)ONSTORM. 



FOR MORE INFORMATION: 

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



HTTP://WEATHER.GC.CA



END/OSPC