WWCN11 CWTO 310933
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 5:33 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 STRONG WIND GUSTS, 
LARGE HAIL AND HEAVY RAIN.

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

WHEN: 
EARLY THIS MORNING. 

ADDITIONAL INFORMATION: 
THUNDERSTORMS OVER LOWER MICHIGAN WILL CROSS THE BORDER NEAR 6.00 
A.M. THEN TRACK EAST ACROSS THE REGION.

DRIVING CONDITIONS MAY BE DIFFICULT. WHEN THUNDER ROARS, GO 
INDOORS(EXCLAMATION MARK) LIGHTNING KILLS AND INJURES CANADIANS 
EVERY YEAR. SECURE LOOSE OBJECTS. 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