WUCN11 CWTO 222343
YELLOW WARNING - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
ISSUED BY ENVIRONMENT CANADA
AT 7:43 P.M. EDT SATURDAY 22 AUGUST 2026.
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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:
=NEW= ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY
=NEW= LONDON - PARKHILL - EASTERN MIDDLESEX COUNTY
=NEW= WOODSTOCK - TILLSONBURG - OXFORD COUNTY.

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IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH

==DISCUSSION==

UPDATED OR ENDED BY 8:40 P.M. EDT.

AT�7:41 P.M. EDT,�A SEVERE THUNDERSTORM�IS LOCATED�OVER ST. 
THOMAS.�THIS SEVERE THUNDERSTORM IS MOVING EAST AT 40 KM/H.�STRONG 
WIND GUSTS, UP TO QUARTER SIZE HAIL AND HEAVY RAIN ARE POSSIBLE. 

LOCATIONS AND NEARBY AREAS THAT COULD BE IMPACTED INCLUDE: ST. 
THOMAS, BELMONT, AYLMER, SPRINGFIELD, STRAFFORDVILLE, MOUNT ELGIN

A TORNADO IS ALSO POSSIBLE.

TAKE IMMEDIATE COVER IF A THUNDERSTORM APPROACHES. IF OUTSIDE, 
PROTECT YOURSELF FROM FLYING DEBRIS AND HAIL. IF YOU HEAR ROARING 
WIND, SEE A FUNNEL CLOUD, FLYING DEBRIS, OR ANY THREATENING WEATHER 
APPROACHING, TAKE SHELTER IMMEDIATELY. DAMAGE TO ROOFS, FENCES, SOFT 
SHELTERS OR TREES IS LIKELY. 

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