WWCN11 CWTO 312322
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 7:22 P.M. EDT TUESDAY 31 MARCH 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
=NEW= CITY OF TORONTO
=NEW= HALTON HILLS - MILTON
=NEW= MISSISSAUGA - BRAMPTON
=NEW= CALEDON
=NEW= VAUGHAN - RICHMOND HILL - MARKHAM
=NEW= NEWMARKET - GEORGINA - NORTHERN YORK REGION
=NEW= INNISFIL - NEW TECUMSETH - ANGUS
      SARNIA - LAMBTON
      LONDON - MIDDLESEX
      WOODSTOCK - TILLSONBURG - OXFORD COUNTY
      GODERICH - BLUEWATER - SOUTHERN HURON COUNTY
      STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY
      LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY
      WATERLOO - WELLINGTON
      ORANGEVILLE - GRAND VALLEY - SOUTHERN DUFFERIN COUNTY.

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IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH

==DISCUSSION==

CONDITIONS ARE FAVOURABLE FOR THE DEVELOPMENT OF SEVERE 
THUNDERSTORMS THAT MAY BE CAPABLE OF PRODUCING STRONG WIND GUSTS, 
LARGE HAIL AND HEAVY RAIN.

WHAT: 
TORRENTIAL DOWNPOURS. 
90 KM/H WIND GUSTS. 
UP TO TOONIE SIZE HAIL. 

WHEN: 
THIS EVENING. 

ADDITIONAL INFORMATION: 
THUNDERSTORMS WILL CONTINUE TO TRACK EAST ACROSS PARTS OF THE REGION 
THROUGH THE EVENING.

WHEN THUNDER ROARS, GO INDOORS(EXCLAMATION MARK) LIGHTNING KILLS AND 
INJURES CANADIANS EVERY YEAR. HEAVY RAIN CAN CAUSE FLASH FLOODING 
AND SIGNIFICANT REDUCTIONS TO VISIBILITY. SEVERE THUNDERSTORM 
WATCHES ARE ISSUED WHEN CONDITIONS ARE FAVOURABLE FOR THE 
DEVELOPMENT OF THUNDERSTORMS CAPABLE OF PRODUCING 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