WWCN11 CWTO 192314
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 7:14 P.M. EDT TUESDAY 19 MAY 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
      ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY
      SIMCOE - DELHI - NORFOLK
      OXFORD - BRANT
      CALEDON
      NEWMARKET - GEORGINA - NORTHERN YORK REGION
      UXBRIDGE - BEAVERTON - NORTHERN DURHAM REGION
      DUFFERIN - INNISFIL
      BARRIE - ORILLIA - MIDLAND
      PETERBOROUGH - KAWARTHA LAKES
      BANCROFT - BON ECHO PARK
      BRACEBRIDGE - GRAVENHURST
      HALIBURTON
      BARRY'S BAY - KILLALOE
      PETAWAWA - PEMBROKE - COBDEN.

YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - ENDED FOR:
      WINDSOR - ESSEX - CHATHAM-KENT
      SARNIA - LAMBTON
      RODNEY - SHEDDEN - WESTERN ELGIN COUNTY
      LONDON - MIDDLESEX
      HURON - PERTH
      WATERLOO - WELLINGTON
      SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY
      HANOVER - DUNDALK - SOUTHERN GREY COUNTY
      OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY
      PORT CARLING - PORT SEVERN
      HUNTSVILLE - BAYSVILLE
      ALGONQUIN.

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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 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