857
WWCN11 CWTO 201655
HEAT WARNING
FOR SOUTHERN ONTARIO
ISSUED BY ENVIRONMENT CANADA
AT 12:55 P.M. EDT FRIDAY 20 JUNE 2025.
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HEAT WARNING FOR:
=NEW= WINDSOR - ESSEX - CHATHAM-KENT
=NEW= SARNIA - LAMBTON.
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==DISCUSSION==
THE FIRST SIGNIFICANT HEAT WAVE OF THE SEASON WITH DANGEROUSLY HOT
CONDITIONS WILL BEGIN SATURDAY AFTERNOON AND IS EXPECTED TO CONTINUE
THROUGH MUCH OF NEXT WEEK.
WHAT:
DAYTIME HIGHS OF 31 TO 36 DEGREES CELSIUS.
HUMIDEX VALUES OF 40 TO 45.
OVERNIGHT LOWS OF 21 TO 25 DEGREES CELSIUS LEAVING LITTLE RELIEF
FROM THE HEAT.
WHEN:
SATURDAY AFTERNOON THROUGH NEXT WEEK.
ADDITIONAL INFORMATION:
TAKE ACTION TO PROTECT YOURSELF AND OTHERS - EXTREME HEAT CAN AFFECT
EVERYONE'S HEALTH. DETERMINE IF YOU OR OTHERS AROUND YOU ARE AT
GREATER RISK OF HEAT ILLNESS. CHECK ON OLDER ADULTS, THOSE LIVING
ALONE AND OTHER AT-RISK PEOPLE IN-PERSON OR ON THE PHONE MULTIPLE
TIMES A DAY.
WATCH FOR THE EARLY SIGNS OF HEAT EXHAUSTION IN YOURSELF AND OTHERS.
SIGNS MAY INCLUDE HEADACHE, NAUSEA, DIZZINESS, THIRST, DARK URINE
AND INTENSE FATIGUE. STOP YOUR ACTIVITY AND DRINK WATER.
HEAT STROKE IS A MEDICAL EMERGENCY(EXCLAMATION MARK) CALL 9-1-1 OR
YOUR EMERGENCY HEALTH PROVIDER IF YOU, OR SOMEONE AROUND YOU, IS
SHOWING SIGNS OF HEAT STROKE WHICH CAN INCLUDE RED AND HOT SKIN,
DIZZINESS, NAUSEA, CONFUSION AND CHANGE IN CONSCIOUSNESS. WHILE YOU
WAIT FOR MEDICAL ATTENTION, TRY TO COOL THE PERSON BY MOVING THEM TO
A COOL PLACE, REMOVING EXTRA CLOTHING, APPLYING COLD WATER OR ICE
PACKS AROUND THE BODY.
PLAN AND SCHEDULE OUTDOOR ACTIVITIES DURING THE COOLEST PARTS OF THE
DAY.
LIMIT DIRECT EXPOSURE TO THE SUN AND HEAT. WEAR LIGHTWEIGHT,
LIGHT-COLOURED, LOOSE-FITTING CLOTHING AND A WIDE-BRIMMED HAT.
NEVER LEAVE PEOPLE, ESPECIALLY CHILDREN, OR PETS INSIDE A PARKED
VEHICLE. CHECK THE VEHICLE BEFORE LOCKING TO MAKE SURE NO ONE IS
LEFT BEHIND.
FOR MORE INFORMATION:
HTTPS://WWW.CANADA.CA/EN/HEALTH-CANADA/SERVICES/CLIMATE-CHANGE-HEALTH/EXTREME-HEAT/HOW-PROTECT-YOURSELF.HTML
HTTPS://WWW.CANADA.CA/EN/HEALTH-CANADA/SERVICES/CLIMATE-CHANGE-HEALTH/EXTREME-HEAT/WHO-IS-AT-RISK.HTML
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.
HTTP://WEATHER.GC.CA
END/OSPC
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