815  
WUCN11 CWTO 232145  
SEVERE THUNDERSTORM WARNING  
FOR SOUTHERN ONTARIO  
UPDATED BY ENVIRONMENT CANADA  
AT 5:45 P.M. EDT TUESDAY 23 SEPTEMBER 2025.  
---------------------------------------------------------------------  
SEVERE THUNDERSTORM WARNING FOR:  
LONDON - MIDDLESEX.  
 
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==DISCUSSION==  
 
UPDATED OR ENDED BY 6:59 P.M. EDT.  
 
AT 5:45 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A  
CLUSTER OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING HEAVY RAIN.  
 
THIS CLUSTER OF SEVERE THUNDERSTORMS IS LOCATED FROM ILDERTON TO 8  
KILOMETRES SOUTH OF LAMBTON SHORES TO STRATHROY, MOVING EAST AT 15  
KM/H.  
 
HAZARD: HEAVY RAINFALL WITH LOCAL AMOUNTS OF 50 TO 75 MM  
 
LOCATIONS IMPACTED INCLUDE:  
PARKHILL, STRATHROY, MOUNT BRYDGES, KOMOKA, KOMOKA PROVINCIAL PARK,  
ILDERTON, KERWOOD, SABLE, ADELAIDE, SPRINGBANK, NAIRN, AILSA CRAIG,  
POPLAR HILL, DENFIELD, SYLVAN, DEJONG, KEYSER, NAPPERTON, BORNISH  
AND MULLIFARRY.  
 
HEAVY RAIN MAY CAUSE FLASH FLOODING AND SIGNIFICANT REDUCTIONS TO  
VISIBILITY. FAST-MOVING AND RAPIDLY RISING WATER CAN SWEEP VEHICLES  
AWAY AND DAMAGE INFRASTRUCTURE. TAKE IMMEDIATE COVER IF A  
THUNDERSTORM APPROACHES. IF OUTSIDE, PROTECT YOURSELF FROM FLYING  
DEBRIS AND HAIL. DON'T DRIVE THROUGH FLOODED ROADWAYS.  
 
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  
 
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