WUCN11 CWTO 190159

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 9:59 P.M. EDT MONDAY 18 MAY 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

      DEEP RIVER - WHITNEY - EASTERN ALGONQUIN PARK.



YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - ENDED FOR:

      OXTONGUE LAKE - FORT IRWIN - NORTHERN HALIBURTON COUNTY

      WESTERN ALGONQUIN PARK - LAKE OF TWO RIVERS.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 11:58 P.M. EDT.



AT 9:59 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WIND 

GUSTS AND UP TO QUARTER SIZE HAIL.



THUNDERSTORM LOCATION: 

ALGONQUIN PROVINCIAL PARK TO 25 KM NORTHEAST OF LAKE OF TWO RIVERS 

TO 30 KM EAST OF LAKE OF TWO RIVERS 



MOTION: MOVING QUICKLY TO THE EAST AT 70 KM/H 



HAZARDS: 

WIND: DAMAGING (90 - 110 KM/H) 

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

RAIN: HEAVY (15 - 25 MM) 



LOCATIONS IN THE PATH: 

ALGONQUIN PROVINCIAL PARK 

WHITNEY 

UPPER MADAWASKA RIVER PROVINCIAL PARK 

LAKE TRAVERS 

GRAND LAKE



LOCAL UTILITY OUTAGES ARE LIKELY. DAMAGE TO ROOFS, FENCES, SOFT 

SHELTERS OR TREES IS LIKELY. 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