WUCN11 CWTO 301339

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 9:39 A.M. EDT TUESDAY 30 JUNE 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

      ALGONQUIN.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 11:38 A.M. EDT.



AT 9:39 A.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING AN 

AREA OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING STRONG WIND GUSTS, 

UP TO QUARTER SIZE HAIL AND VERY HEAVY RAIN.



THUNDERSTORM LOCATION: 

CHISWICK TO MATTAWA 



MOTION: MOVING SOUTHEAST AT 40 KM/H 



HAZARDS: 

WIND: STRONG (UP TO 90 KM/H) 

HAIL: UP TO QUARTER SIZE (UP TO 2.5 CM) 

RAIN: VERY HEAVY (50 - 100 MM) 



LOCATIONS IN THE PATH: 

CHISWICK, KIOSK, LAKE TRAVERS, ALGONQUIN PROVINCIAL PARK



LOCAL UTILITY OUTAGES ARE LIKELY. HEAVY RAIN MAY CAUSE FLASH 

FLOODING AND SIGNIFICANT REDUCTIONS TO VISIBILITY. TAKE IMMEDIATE 

COVER IF A THUNDERSTORM APPROACHES. IF OUTSIDE, PROTECT YOURSELF 

FROM FLYING DEBRIS AND HAIL. 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