WUCN11 CWTO 181714

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 1:14 P.M. EDT SATURDAY 18 JULY 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

      BURLINGTON - OAKVILLE

      HALTON HILLS - MILTON

      MISSISSAUGA - BRAMPTON.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 2:29 P.M. EDT.



AT 1:13 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING UP TO QUARTER SIZE 

HAIL AND HEAVY RAIN.



A LINE OF SEVERE THUNDERSTORM LOCATED OVER: CAMPBELLVILLE TO MILTON 

TO SOUTHERN MISSISSAUGA. 



MOTION: 

MOVING EAST AT 60 KM/H. 



HAZARDS: 

UP TO QUARTER SIZED HAIL POSSIBLE. 

LOCALLY HEAVY RAINFALL WITH UP TO 50 MM POSSIBLE. 



LOCATIONS IN THE PATH: 

MOFFAT, HALTONVILLE, CAMPBELLVILLE, MILTON, HORNBY EASTERN OAKVILLE, 

TRAFALGAR, SOUTHERN MISSISSAUGA, RATTRAY MARSH CONSERVATION AREA.



DRIVING CONDITIONS WILL LIKELY BE DIFFICULT. LOCAL UTILITY OUTAGES 

ARE LIKELY. HEAVY RAIN MAY CAUSE FLASH FLOODING AND SIGNIFICANT 

REDUCTIONS TO VISIBILITY. FAST-MOVING AND RAPIDLY RISING WATER CAN 

SWEEP VEHICLES AWAY AND DAMAGE INFRASTRUCTURE. LARGE HAIL MAY CAUSE 

SIGNIFICANT DAMAGE AND INJURY. DON'T DRIVE THROUGH FLOODED ROADWAYS. 

AVOID LOW-LYING AREAS. 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