WUCN11 CWTO 222118
YELLOW WARNING - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 5:18 P.M. EDT SATURDAY 22 AUGUST 2026.
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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:
      LONDON - PARKHILL - EASTERN MIDDLESEX COUNTY
      WOODSTOCK - TILLSONBURG - OXFORD COUNTY
      STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY.

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IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH

==DISCUSSION==

UPDATED OR ENDED BY 6:17 P.M. EDT.

AT�5:18 P.M. EDT,�A SEVERE THUNDERSTORM�IS LOCATED�OVER 
WELLBURN.�THIS SEVERE THUNDERSTORM IS MOVING EAST AT 25 KM/H.�STRONG 
WIND GUSTS, UP TO QUARTER SIZE HAIL AND HEAVY RAIN ARE POSSIBLE. 

LOCATIONS AND NEARBY AREAS THAT COULD BE IMPACTED INCLUDE: WELLBURN, 
LAKESIDE, EMBRO

TAKE IMMEDIATE COVER IF A THUNDERSTORM APPROACHES. IF OUTSIDE, 
PROTECT YOURSELF FROM FLYING DEBRIS AND HAIL. HEAVY RAIN MAY CAUSE 
FLASH FLOODING AND SIGNIFICANT REDUCTIONS TO VISIBILITY. LARGE HAIL 
MAY CAUSE SIGNIFICANT DAMAGE AND INJURY. 

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 SOCIAL MEDIA USING 
(HASH)ONSTORM. 

FOR MORE INFORMATION: 
HTTPS://WWW.ONTARIO.CA/PAGE/BE-PREPARED-EMERGENCY.

HTTP://WEATHER.GC.CA

END/OSPC