WUCN11 CWTO 310630
YELLOW WARNING - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 2:30 A.M. EDT TUESDAY 31 MARCH 2026.
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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:
      WINGHAM - BLYTH - NORTHERN HURON COUNTY
      LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY
      MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY
      ORANGEVILLE - GRAND VALLEY - SOUTHERN DUFFERIN COUNTY
      SHELBURNE - MANSFIELD - NORTHERN DUFFERIN COUNTY
      SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY
      HANOVER - DUNDALK - SOUTHERN GREY COUNTY.

YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - ENDED FOR:
      BRUCE PENINSULA - SAUBLE BEACH - TOBERMORY
      OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY.

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IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH

==DISCUSSION==

UPDATED OR ENDED BY 4:43 A.M. EDT.

AT 2:29 A.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 
SEVERE THUNDERSTORM CAPABLE OF PRODUCING UP TO NICKEL SIZE HAIL AND 
HEAVY RAIN.

THUNDERSTORMS WITH HEAVY DOWNPOURS. 

WHAT: 
TORRENTIAL DOWNPOURS GIVING LOCAL RAIN AMOUNTS 25 TO 50 MM WITH 50 
TO 75 MM POSSIBLE. 
NICKEL SIZE HAIL 
FREQUENT LIGHTNING. 

WHEN: 
OVERNIGHT. 

ADDITIONAL INFORMATION: 
CLUSTERS OF THUNDERSTORMS ARE TRACKING EAST FROM MICHIGAN AND LAKE 
HURON ACROSS THE REGION. LOCAL RAINFALL AMOUNTS OF 50 TO 75 MM ARE 
POSSIBLE IN AREAS THAT RECEIVE SEVERAL THUNDERSTORMS IN A ROW.

DRIVING CONDITIONS WILL LIKELY BE DIFFICULT. HEAVY RAIN MAY CAUSE 
FLASH FLOODING AND SIGNIFICANT REDUCTIONS TO VISIBILITY. TAKE 
IMMEDIATE COVER IF A THUNDERSTORM APPROACHES. IF OUTSIDE, PROTECT 
YOURSELF FROM FLYING DEBRIS AND HAIL. DON'T DRIVE THROUGH FLOODED 
ROADWAYS. SEVERE THUNDERSTORM WARNINGS ARE ISSUED WHEN IMMINENT OR 
OCCURRING THUNDERSTORMS ARE EXPECTED TO PRODUCE 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