052
WWCN11 CWTO 121725
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
ISSUED BY ENVIRONMENT CANADA
AT 1:25 P.M. EDT WEDNESDAY 12 AUGUST 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
=NEW= BROCKVILLE - LEEDS AND GRENVILLE
=NEW= CITY OF OTTAWA
=NEW= GATINEAU
=NEW= PRESCOTT AND RUSSELL
=NEW= CORNWALL - MORRISBURG
=NEW= SMITHS FALLS - LANARK - SHARBOT LAKE
=NEW= RENFREW - PEMBROKE - BARRY'S BAY
=NEW= 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:
CONTINUING THIS AFTERNOON INTO THIS EVENING.
ADDITIONAL INFORMATION:
SCATTERED THUNDERSTORMS HAVE DEVELOPED AND ARE EXPECTED TO PERSIST
THROUGH THE DAY.
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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