Extreme Heat | Norfolk County

Extreme heat events can put the public at risk of heat-related illnesses. Four environmental factors work together to make it hot enough to endanger health: high temperature, high relative humidity (moisture in the air), radiant heat (from the sun), and low wind speed (lack of air movement). Additionally, an individual’s health can depend on their sensitivity, acclimatization, and their own, as well as their community’s, adaptability to extreme heat.

Heat Affects Everybody

Heat illnesses are preventable and knowing the risks and how to protect yourself and your family will keep you safe over the summer. Much like a fever, extreme heat stresses your body’s ability to maintain its normal temperature and can lead to a heat stroke. When out in the heat, watch for symptoms of heat illness, which include:

dizziness or fainting;
nausea or vomiting;
headache;
rapid breathing and heartbeat;
extreme thirst; and
decreased urination with unusually dark yellow urine.

If you experience any of these symptoms during extreme heat, immediately move to a cool place and drink liquids. Water is best.

Heat stroke is considered the most serious heat-related illness and can result in death, if not addressed quickly. Symptoms of a heat stroke include a high body temperature, confusion and feeling tired. If you suspect you or someone else is experiencing a heat stroke, call 911 immediately.

A list of heat-related illnesses (in descending order of severity) and their symptoms can be found below:

Heat Stroke

Most serious type of heat illness as a result of body heat overload. Signs of heat stroke include a core body temperature of more than 40C/104F, complete or partial loss of consciousness and/or reduced mental ability. Sweating is not a good indicator as there are two types of heat stroke:

Classic- accompanied by little or no sweating, usually occurring in children, those who are chronically ill and older adults.
Exertional- accompanied by an increase in core body temperature because of strenuous exercise or occupational exposure in combination with environmental heat and where sweating is usually present.

Heat Exhaustion

Caused by excessive loss of water and salt. Symptoms include heavy sweating, weakness, dizziness, nausea, headache, diarrhea and muscle cramps.

Heat Fainting

Caused by the loss of body fluids from sweating and from lowered blood pressure due to pooling of blood in the legs. Symptoms include temporary dizziness and fainting resulting from an insufficient flow of blood to the brain while the person is standing.

Heat Cramps

Caused by a salt imbalance resulting from a failure to replace salt lost through excessive sweating. Symptoms are sharp muscle pains.

Heat Rash

A result of inflammation of clogged sweat glands and accompanied by tiny red spots on the skin which may give a prickling sensation.

Heat Edema

Heat induced swelling frequently noticeable in the ankles, feet and hands and most often seen in people who are not regularly exposed to heat.

Who is Most at Risk?

Infants and young children
Pregnant women
Older adults
People with certain chronic illnesses, such as breathing difficulties, heart conditions, or psychiatric illnesses
People under the influence of drugs or alcohol
People who have mobility constraints
People who work or exercise outside
Socially disadvantaged individuals such as those who are isolated, have low income or are homeless
Newcomers to Canada (e.g. tourists, immigrants) that may not be acclimatized

Heat Warnings

The Grand Erie Health Unit’s Medical Officer of Health issues a Heat Warning or an Extended Heat Warning when certain extreme heat thresholds have been met. Details for each warning and their triggers can be found below.

Heat Warning: A heat warning will be issued when

2 consecutive days are forecasted to have a daytime high temperature of 31°C or higher AND a nighttime temperature of 20°C or higher;

OR

2 consecutive days are forecasted to have a humidex of 40°C or higher.

Extended Heat Warning: An extended heat warning will be issued when

3 or more consecutive days are forecasted to have a daytime high temperature of 31°C or higher AND a nighttime temperature of 20°C or higher;

OR

3 or more consecutive days or more are forecasted to have a humidex of 40°C or higher

Where Can I Go to Cool Down?

The following locations are available to help stay cool while a heat warning or extended heat warning is in effect:

Facilities with Air Conditioning

Norfolk County Public Libraries - Check olc.ncpl.on.ca for locations and hours of operation.
Waterford Tricenturena Arena - 32 E Church Street, Waterford. Check norfolkcounty.ca/skating for hours of operation.

Pools

Annaleise Carr Aquatic Centre – 182 South Drive, Simcoe
Delhi Kinsmen Pool – 336 Talbot Road, Delhi

Swim programs and schedules vary. Admission rates apply, visit norfolkcounty.ca/swimming for details.

Splash Pads

Simcoe Kinsmen Splash Pad – 281 Head Street North, Simcoe
Delhi Splash Pad – 336 Talbot Road, Delhi

Visit norfolkcounty.ca/swimming for hours of operation.

What Else Can I Do to Prevent Heat Related Illness?

The following actions can help you stay cool and prevent heat-related illness:

Drink plenty of cool liquids, especially water, before feeling thirsty.
Wear loose-fitting, light-coloured clothing made of breathable fabric.
Take cool showers or baths until you feel refreshed.
Take a break from the heat by spending a few hours in a cool place.
Block sun out by closing awnings, curtains or blinds during the day.
If you must be outdoors, avoid sun exposure by staying in the shade; wear a wide-brimmed, breathable hat or use an umbrella.
If you are taking medication or have a health condition, ask your doctor or pharmacist if it increases your health risk in the heat and follow their recommendations.
Plan outdoor activities during cooler parts of the day (the early morning or in the evening).
Never leave people or pets in your care inside a parked vehicle or in direct sunlight.
Frequently visit neighbours, friends and older family members, especially those who are elderly and living alone, as well as those who are chronically ill, to make sure that they are cool and hydrated.