WWCN11 CWTO 181706
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
ISSUED BY ENVIRONMENT CANADA
AT 1:06 P.M. EDT MONDAY 18 MAY 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
=NEW= WINDSOR - ESSEX - CHATHAM-KENT
=NEW= SARNIA - LAMBTON
=NEW= GODERICH - BLUEWATER - SOUTHERN HURON COUNTY
=NEW= WINGHAM - BLYTH - NORTHERN HURON COUNTY
=NEW= SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY
=NEW= HANOVER - DUNDALK - SOUTHERN GREY COUNTY
=NEW= OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY.

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IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH

==DISCUSSION==

CONDITIONS ARE FAVOURABLE FOR THE DEVELOPMENT OF SEVERE 
THUNDERSTORMS THAT MAY BE CAPABLE OF PRODUCING STRONG WIND GUSTS AND 
LARGE HAIL.

HAZARDS: 
WIND GUSTS UP TO 100 KM/H 
HAIL UP TO TOONIE SIZE 

TIMING: 
THIS AFTERNOON AND EVENING 

ADDITIONAL INFORMATION: 
THUNDERSTORMS ARE EXPECTED TO MOVE EASTWARD INTO THE AREA FROM LOWER 
MICHIGAN. THE MAIN HAZARD WILL BE DAMAGING WIND GUSTS.

LOCAL UTILITY OUTAGES ARE POSSIBLE. DAMAGE TO ROOFS, FENCES, 
BRANCHES OR SOFT SHELTERS IS POSSIBLE. WHEN THUNDER ROARS, GO 
INDOORS(EXCLAMATION MARK) LIGHTNING KILLS AND INJURES CANADIANS 
EVERY YEAR. SEVERE THUNDERSTORM WATCHES ARE ISSUED WHEN CONDITIONS 
ARE FAVOURABLE FOR THE DEVELOPMENT OF THUNDERSTORMS CAPABLE OF 
PRODUCING 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