WUCN11 CWTO 091909
YELLOW WARNING - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 3:09 P.M. EDT THURSDAY 9 JULY 2026.
---------------------------------------------------------------------
YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:
=NEW= ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION
      CITY OF HAMILTON
      BURLINGTON - OAKVILLE
      MISSISSAUGA - BRAMPTON.

---------------------------------------------------------------------
IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH

==DISCUSSION==

UPDATED OR ENDED BY 5:08 P.M. EDT.

AT 3:09 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING AN 
AREA OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING STRONG WIND GUSTS 
AND HEAVY RAIN.

THUNDERSTORM LOCATION: 
MISSISSAUGA TO HAMILTON 

MOTION: 
MOVING EAST AT 60 KM/H 

HAZARDS: 
WIND: STRONG (90 - 110 KM/H) 
TORRENTIAL DOWNPOURS 

LOCATIONS IN THE PATH: 
MILTON 
BURLINGTON 
MISSISSAUGA 
OAKVILLE 
HAMILTON 
GRIMSBY

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