193
WWCN11 CWTO 271739
YELLOW WATCH - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 1:39 P.M. EDT MONDAY 27 JULY 2026.
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YELLOW LEVEL WATCH - SEVERE THUNDERSTORM - FOR:
=NEW= ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY
=NEW= SIMCOE - DELHI - NORFOLK
=NEW= WOODSTOCK - TILLSONBURG - OXFORD COUNTY
=NEW= STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY
=NEW= LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY
WINDSOR - ESSEX - CHATHAM-KENT
SARNIA - LAMBTON
RODNEY - SHEDDEN - WESTERN ELGIN COUNTY
LONDON - MIDDLESEX
GODERICH - BLUEWATER - SOUTHERN HURON COUNTY
WINGHAM - BLYTH - NORTHERN HURON COUNTY
SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY.
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IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH
==DISCUSSION==
CONDITIONS ARE FAVOURABLE FOR THE DEVELOPMENT OF DANGEROUS
THUNDERSTORMS THAT MAY BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS,
LARGE HAIL AND TORRENTIAL RAIN.
HAZARDS:
WINDS GUSTS OF 90 TO 110 KM/H.
LOCAL RAINFALL AMOUNTS EXCEEDING 50 MM.
QUARTER TO PING PONG BALL SIZED HAIL.
WHEN:
THIS AFTERNOON THROUGH THE EVENING.
ADDITIONAL INFORMATION:
THUNDERSTORMS OVER LAKE HURON WILL CONTINUE TO MOVE SOUTHEASTWARDS
AND AFFECT THE AREA THIS AFTERNOON AND EVENING.
RAINFALL AMOUNTS MAY EXCEED 50 MM FOR LOCATIONS THAT RECEIVE
MULTIPLE THUNDERSTORMS.
LOCAL UTILITY OUTAGES ARE POSSIBLE. DAMAGE TO ROOFS, FENCES,
BRANCHES OR SOFT SHELTERS IS POSSIBLE. 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.
LARGE HAIL CAN CAUSE SIGNIFICANT DAMAGE AND INJURY.
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
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