WWCN11 CWTO 182042

YELLOW WATCH - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 4:42 P.M. EDT SATURDAY 18 JULY 2026.

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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:

      NAPANEE - CONSECON

      KINGSTON - ODESSA - FRONTENAC ISLANDS

      STIRLING - TWEED - SOUTH FRONTENAC

      BANCROFT - BON ECHO PARK

      BROCKVILLE - LEEDS AND GRENVILLE

      CITY OF OTTAWA

      GATINEAU

      PRESCOTT AND RUSSELL

      CORNWALL - MORRISBURG

      SMITHS FALLS - LANARK - SHARBOT LAKE

      RENFREW - PEMBROKE - BARRY'S BAY.



YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - ENDED FOR:

      DEEP RIVER - WHITNEY - EASTERN ALGONQUIN PARK.



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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 110 KM/H. 

QUARTER SIZED HAIL. 

RAINFALL AMOUNTS 20 TO 50 MM OVER A FEW LOCALES. 

RISK OF A TORNADO. 



WHEN: 

CONTINUING EARLY THIS EVENING. 



ADDITIONAL COMMENTS: 

THE POTENTIAL FOR THUNDERSTORMS WILL CONTINUE INTO THIS EVENING.



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. 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. 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