355
WWCN11 CWTO 181948
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 3:48 P.M. EDT SATURDAY 18 JULY 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
PICKERING - OSHAWA - SOUTHERN DURHAM REGION.
YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - ENDED FOR:
CITY OF TORONTO
BURLINGTON - OAKVILLE
HALTON HILLS - MILTON
MISSISSAUGA - BRAMPTON
VAUGHAN - RICHMOND HILL - MARKHAM.
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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,
LARGE HAIL AND HEAVY RAIN.
WHAT:
WIND GUSTS UP TO 100 KM/H.
QUARTER SIZED HAIL.
RAINFALL AMOUNTS 25 TO 50 MM.
WHEN:
CONTINUING THIS AFTERNOON.
ADDITIONAL COMMENTS:
A COLD FRONT PUSHING THROUGH THE REGION MAY CONTINUE TO BRING
THUNDERSTORMS AS IT MOVES SOUTHEAST OVER THE AREA.
DRIVING CONDITIONS MAY BE DIFFICULT. 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. SECURE LOOSE OBJECTS. HEAVY
RAIN CAN CAUSE FLASH FLOODING AND SIGNIFICANT REDUCTIONS TO
VISIBILITY. SEVERE THUNDERSTORM WATCHES ARE ISSUED WHEN CONDITIONS
ARE FAVOURABLE FOR THE DEVELOPMENT OF THUNDERSTORMS CAPABLE OF
PRODUCING 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
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