WWCN11 CWTO 191530
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
ISSUED BY ENVIRONMENT CANADA
AT 11:30 A.M. EDT TUESDAY 19 MAY 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
=NEW= WINDSOR - ESSEX - CHATHAM-KENT
=NEW= SARNIA - LAMBTON
=NEW= ELGIN
=NEW= LONDON - MIDDLESEX
=NEW= WOODSTOCK - TILLSONBURG - OXFORD COUNTY
=NEW= CALEDON
=NEW= NEWMARKET - GEORGINA - NORTHERN YORK REGION
=NEW= UXBRIDGE - BEAVERTON - NORTHERN DURHAM REGION
=NEW= HURON - PERTH
=NEW= WATERLOO - WELLINGTON
=NEW= DUFFERIN - INNISFIL
=NEW= SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY
=NEW= HANOVER - DUNDALK - SOUTHERN GREY COUNTY
=NEW= OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY
=NEW= BARRIE - ORILLIA - MIDLAND
=NEW= PETERBOROUGH - KAWARTHA LAKES
=NEW= PORT CARLING - PORT SEVERN
=NEW= BRACEBRIDGE - GRAVENHURST
=NEW= HALIBURTON - MINDEN - SOUTHERN HALIBURTON 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.

WHAT: 
WINDS GUSTING 90 TO 110 KM/H. 
HAIL UP TO PING PONG BALL SIZED. 
A TORNADO IS ALSO POSSIBLE. 

WHEN: 
THIS AFTERNOON AND 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. LARGE HAIL CAN CAUSE SIGNIFICANT DAMAGE AND INJURY. 

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