WWCN11 CWTO 310634
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 2:34 A.M. EDT TUESDAY 31 MARCH 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
      CHATHAM-KENT - RONDEAU PARK
      SARNIA - LAMBTON
      ELGIN
      LONDON - MIDDLESEX
      SIMCOE - DELHI - NORFOLK
      DUNNVILLE - CALEDONIA - HALDIMAND
      OXFORD - BRANT
      GODERICH - BLUEWATER - SOUTHERN HURON COUNTY
      STRATFORD - MITCHELL - SOUTHERN PERTH 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 LARGE HAIL AND HEAVY 
RAIN.

WHAT: 
UP TO TOONIE SIZE HAIL. 
TORRENTIAL DOWNPOURS. 
FREQUENT LIGHTNING. 

WHEN: 
TONIGHT. 

ADDITIONAL INFORMATION: 
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND TRACK THROUGH THE REGION 
TONIGHT.

DRIVING CONDITIONS MAY BE DIFFICULT. WHEN THUNDER ROARS, GO 
INDOORS(EXCLAMATION MARK) LIGHTNING KILLS AND INJURES CANADIANS 
EVERY YEAR. DON'T DRIVE THROUGH FLOODED ROADWAYS. 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