141
WWCN11 CWTO 130142
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 9:42 P.M. EDT WEDNESDAY 12 AUGUST 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
BROCKVILLE - LEEDS AND GRENVILLE
CITY OF OTTAWA
GATINEAU
PRESCOTT AND RUSSELL
CORNWALL - MORRISBURG
SMITHS FALLS - LANARK - SHARBOT LAKE
RENFREW - ARNPRIOR - CALABOGIE.
YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - ENDED FOR:
BARRY'S BAY - KILLALOE
PETAWAWA - PEMBROKE - COBDEN
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 NEAR 90 KM/H.
QUARTER SIZED HAIL.
HEAVY RAIN.
WHEN:
THIS EVENING.
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.
STRONG WIND GUSTS CAN DAMAGE TREES, BUILDINGS AND OVERTURN VEHICLES.
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 SOCIAL MEDIA USING
(HASH)ONSTORM. TO REPORT SEVERE WEATHER IN GATINEAU, SEND AN EMAIL
TO ONSTORM(AT)EC.GC.CA OR POST REPORTS ON SOCIAL MEDIA USING
(HASH)QCSTORM.
FOR MORE INFORMATION:
HTTPS://WWW.ONTARIO.CA/PAGE/BE-PREPARED-EMERGENCY.
HTTP://WEATHER.GC.CA
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