WUCN11 CWTO 181745

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 1:45 P.M. EDT SATURDAY 18 JULY 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

=NEW= RODNEY - SHEDDEN - WESTERN ELGIN COUNTY

=NEW= CITY OF HAMILTON

      WATFORD - PINERY PARK - EASTERN LAMBTON COUNTY

      ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY

      LONDON - MIDDLESEX

      SIMCOE - DELHI - NORFOLK

      OXFORD - BRANT.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 3:43 P.M. EDT.



AT 1:44 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WIND 

GUSTS, LOONIE TO PING PONG BALL SIZE HAIL AND HEAVY RAIN.



THUNDERSTORM LOCATION: 

CLUSTERS OF THUNDERSTORMS ARE OCCURRING FROM LAMBTON COUNTY TO 

BRANTFORD. 



MOTION: MOVING SOUTHEAST AT 55 KM/H 



HAZARDS: 

WIND: DAMAGING (90 - 110 KM/H) 

HAIL: LOONIE TO PING PONG BALL SIZE (2.5 TO 4.5 CM) 

RAIN: HEAVY (15 - 50 MM) 

RISK OF TORNADOES 



LOCATIONS IN THE PATH: 

HAMILTON, PARIS, FOREST, WOODSTOCK, BRANTFORD, THAMESFORD, LONDON, 

WATFORD, STRATHROY, MOUNT BRYDGES, DELHI



DAMAGE TO ROOFS, FENCES, SOFT SHELTERS OR TREES IS LIKELY. LARGE 

HAIL MAY CAUSE SIGNIFICANT DAMAGE AND INJURY. TAKE IMMEDIATE COVER 

IF A THUNDERSTORM APPROACHES. IF OUTSIDE, PROTECT YOURSELF FROM 

FLYING DEBRIS AND HAIL. SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES. 

SEVERE THUNDERSTORM WARNINGS ARE ISSUED WHEN IMMINENT OR OCCURRING 

THUNDERSTORMS ARE EXPECTED TO PRODUCE 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