WWCN11 CWTO 181634
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
ISSUED BY ENVIRONMENT CANADA
AT 12:34 P.M. EDT MONDAY 18 MAY 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
=NEW= BRUCE PENINSULA - SAUBLE BEACH - TOBERMORY
=NEW= TOWN OF PARRY SOUND - ROSSEAU - KILLBEAR PARK
=NEW= HUNTSVILLE - BAYSVILLE
=NEW= ALGONQUIN
=NEW= BURK'S FALLS - BAYFIELD INLET.

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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 
RISK OF A TORNADO 

TIMING: 
THIS AFTERNOON AND EVENING 

ADDITIONAL INFORMATION: 
THUNDERSTORMS OVER LOWER MICHIGAN ARE EXPECTED TO INTENSIFY THIS 
AFTERNOON AND MOVE EASTWARD INTO THE AREA. THE MAIN HAZARD WILL BE 
DAMAGING WIND GUSTS. A TORNADO CANNOT BE RULED OUT.

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