WUCN11 CWTO 091936
YELLOW WARNING - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 3:36 P.M. EDT THURSDAY 9 JULY 2026.
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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:
      DUNNVILLE - CALEDONIA - HALDIMAND
      NIAGARA.

YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - ENDED FOR:
      CITY OF HAMILTON.

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IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH

==DISCUSSION==

UPDATED OR ENDED BY 5:34 P.M. EDT.

AT 3:35 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING STRONG WIND GUSTS 
AND HEAVY RAIN.

THUNDERSTORM LOCATION: 
45 KM NORTHWEST OF PORT WELLER HARBOUR TO NELLES CORNERS 

MOTION: 
MOVING EAST AT 60 KM/H 

HAZARDS: 
WIND: STRONG (UP TO 90 KM/H) 
TORRENTIAL DOWNPOURS 

LOCATIONS IN THE PATH: 
HALDIMAND COUNTY 
CAYUGA 
VINELAND 
ST. CATHARINES 
THOROLD 
DUNNVILLE 
NIAGARA FALLS 
WELLAND 
PORT COLBORNE 
FORT ERIE

LOCAL UTILITY OUTAGES ARE LIKELY. DAMAGE TO ROOFS, FENCES, SOFT 
SHELTERS OR TREES IS LIKELY. HEAVY RAIN MAY CAUSE FLASH FLOODING AND 
SIGNIFICANT REDUCTIONS TO VISIBILITY. 

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