330
WUCN11 CWTO 182333
YELLOW WARNING - SEVERE THUNDERSTORM
FOR SOUTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 7:33 P.M. EDT MONDAY 18 MAY 2026.
---------------------------------------------------------------------
YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:
STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY
LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY
MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY
HANOVER - DUNDALK - SOUTHERN GREY COUNTY
OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY.
YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - ENDED FOR:
LONDON - PARKHILL - EASTERN MIDDLESEX COUNTY
GODERICH - BLUEWATER - SOUTHERN HURON COUNTY
WINGHAM - BLYTH - NORTHERN HURON COUNTY
SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY
BRUCE PENINSULA - SAUBLE BEACH - TOBERMORY.
---------------------------------------------------------------------
IMPACT LEVEL: MODERATE
FORECAST CONFIDENCE: HIGH
==DISCUSSION==
UPDATED OR ENDED BY 9:32 P.M. EDT.
AT 7:33 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING STRONG WIND GUSTS.
THUNDERSTORM LOCATION: JOHNSON HARBOUR TO BIRR
MOTION: MOVING EAST AT 70 KM/H
HAZARDS:
WIND: STRONG (UP TO 90 KM/H)
LOCATIONS IN THE PATH:
ETTRICK
MONKTON
ATWOOD
LISTOWEL
ST. MARYS
PALMERSTON
MOUNT FOREST
MARKDALE
THORNBURY
DRAYTON
LOCAL UTILITY OUTAGES ARE LIKELY. DAMAGE TO ROOFS, FENCES, SOFT
SHELTERS OR TREES IS LIKELY. 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
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page