WWCN11 CWTO 192354
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 7:54 P.M. EDT TUESDAY 19 MAY 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
=NEW= STIRLING - TWEED - SOUTH FRONTENAC
      SIMCOE - DELHI - NORFOLK
      NEWMARKET - GEORGINA - NORTHERN YORK REGION
      UXBRIDGE - BEAVERTON - NORTHERN DURHAM REGION
      PETERBOROUGH - KAWARTHA LAKES
      BANCROFT - BON ECHO PARK
      WESTPORT - CHARLESTON LAKE
      MERRICKVILLE-WOLFORD - KEMPTVILLE
      CITY OF OTTAWA
      GATINEAU
      PRESCOTT AND RUSSELL
      WINCHESTER - NEWINGTON
      MAXVILLE - ALEXANDRIA
      SMITHS FALLS - LANARK - SHARBOT LAKE
      HALIBURTON - MINDEN - SOUTHERN HALIBURTON COUNTY
      RENFREW - PEMBROKE - BARRY'S BAY.

YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - ENDED FOR:
      ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY
      OXFORD - BRANT
      CALEDON
      DUFFERIN - INNISFIL
      BARRIE - COLLINGWOOD - HILLSDALE
      ORILLIA - LAGOON CITY - WASHAGO.

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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: 
THUNDERSTORMS CONTINUING UNTIL LATE 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. TO 
REPORT SEVERE WEATHER IN GATINEAU, SEND AN EMAIL TO 
ONSTORM(AT)EC.GC.CA OR POST REPORTS ON X USING (HASH)QCSTORM. 

FOR MORE INFORMATION: 
HTTPS://WWW.ONTARIO.CA/PAGE/BE-PREPARED-EMERGENCY.

HTTP://WEATHER.GC.CA

END/OSPC