WWCN11 CWTO 192049
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
ISSUED BY ENVIRONMENT CANADA
AT 4:49 P.M. EDT TUESDAY 19 MAY 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
=NEW= CITY OF TORONTO
=NEW= SIMCOE - DELHI - NORFOLK
=NEW= DUNNVILLE - CALEDONIA - HALDIMAND
=NEW= BRANTFORD - COUNTY OF BRANT
=NEW= CITY OF HAMILTON
=NEW= BURLINGTON - OAKVILLE
=NEW= HALTON HILLS - MILTON
=NEW= MISSISSAUGA - BRAMPTON
=NEW= VAUGHAN - RICHMOND HILL - MARKHAM.

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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.

WHAT: 
WINDS GUSTING 90 TO 110 KM/H. 
HAIL UP TO QUARTER SIZED. 

WHEN: 
LATE THIS AFTERNOON AND THIS EVENING. 

ADDITIONAL INFORMATION: 
DAMAGING WIND GUSTS WILL BE THE MAIN THREAT WITH THESE STORMS.

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