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First heat warning of 2024 issued

'Dangerously hot and humid conditions’ are expected through the week, and perhaps even in to the weekend.
A heat warning has been issued for Sarnia-Lambton.

A heat warning has been issued for Lambton County — the first of 2024 — as 'dangerously hot and humid conditions’ are expected through the week, and perhaps even in to the weekend, according to Environment Canada.

Daytime highs through the week are expected to be 32 to 35 degrees Celsius with humidex values of 40 to 45. 

See the full forecast here.

“There will be little relief through the overnight as lows are expected to be 20 to 24 degrees Celsius with humidex values of 28 to 35,” the weather agency noted, adding that temperatures and humidex values may be several degrees cooler near the shores of the Great Lakes.

“Heat-related illnesses are a high risk for the elderly, children, and those with chronic illnesses,” said Dr. Karalyn Dueck, Medical Officer of Health, adding that, in high temperatures and humidity, your body may not be able to cool properly which can lead to heat exhaustion or even heat stroke.

“Any individual can be impacted, though, especially if they work or are active outdoors, and it is recommended they take steps to combat the heat and stay cool.”

Lambton Public Health adds that symptoms of heat exhaustion may include rapid breathing, dizziness or fainting, vomiting, rapid heartbeat, extreme thirst, and decreased urination that is unusually dark yellow in colour. 

If you are experiencing these symptoms, move to a shaded or air-conditioned area, drink plenty of water, and rest. If symptoms persist, seek urgent medical attention.

Heat strokes are considered a medical emergency. Call 911 immediately if you are caring for

someone who has a high body temperature, is dizzy or fainting, confused, or has stopped sweating. Friends, family, and neighbours should check on those who may be vulnerable and need help to keep cool or take other preventative actions.

Heat-related illness is preventable

• Drink plenty of fluids, especially water.
• Avoid strenuous activities between 11:00 a.m. and 3:00 p.m. when the sun's rays are strongest. Re-schedule outdoor activities to a cooler time of day.
• Avoid going out in the sun, if possible. If you are outdoors, seek shade and wear sunscreen. Wear lightweight, loose fitting clothing and sunglasses.
• If you are taking medication or have a health condition, ask your healthcare provider if the heat increases your risk, and follow their recommendations.
• Call to check on people who are at risk for heat-related illness, including older adults or person with chronic illnesses to make sure they are keeping cool and hydrated.
• Take cool showers or baths, or use cool, wet towels on your face, neck, or arms.
• The use of a fan alone may not provide enough relief from the heat indoors. Avoid heavy meals and using your oven. Keep curtains closed to block the sun during the day.
• Never leave anyone (including pets) in a parked car. Pets need a cool location and fresh water.

For additional information and resources on extreme heat, please visit Health Canada’s website.

Cooling Centre Locations – Please visit for more information about extreme heat and your health and access a list of available cooling centre locations and the hours of operation.

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