Heat Alert Issued for City & County for Tues. Sept 10

Written by admin, September 9, 2013

September 9, 2013 – Residents Advised to Take Precautions to Avoid Heat-Related Illness

The Peterborough Public Health is issuing a Heat Alert for Peterborough City and County.  The alert is issued based on forecasted temperatures hitting the region beginning Tuesday, September 10.

Hot and humid weather will make a return to southern Ontario tomorrow with most areas seeing humidex values reach or exceed 40C for a few hours in the afternoon.  On Wednesday, regions in southwestern Ontario will see humidex values creep back up close to 40 again for a few afternoon hours, and then back to cooler weather everywhere on Thursday.  This Heat Alert is being issued to help residents prepare for the hot, humid weather in the forecast.

A Heat Alert is issued when the daytime temperatures or Humidex are forecast to be at least 36°C or 36 for two or more consecutive days without a smog advisory. Depending on changes to the weather forecast over the next few days, the Heat Alert may be elevated to a Heat Warning or lifted.

Extreme heat events are a potentially significant health risk and can have a severe impact on the health of vulnerable populations including infants, the elderly, shut-ins, persons with chronic diseases, the morbidly obese and the marginally housed.  Heat related illnesses such as: dehydration; heat cramps; heat exhaustion; and heat stroke are preventable.  Most healthy people can tolerate a short period of hot and humid weather as long as they stay cool and drink plenty of fluids.

People taking medications may be more vulnerable to extreme heat as certain medications may interfere with the body’s cooling functions and water/salt retention. People taking antihypertensives, antidepressants, antipsychotics and anti-Parkinson’s agents are more likely to experience difficulty adapting to high temperatures and should consult with their healthcare provider to see if they are at an increased health risk in the heat.

In order to protect the health of people in Peterborough County and City, Curve Lake First Nation and Hiawatha First Nation, Public Health advises local residents to take the following precautions:


  • Drink lots of water and natural fruit juices even if you don’t feel very thirsty. Avoid alcoholic beverages, coffee and cola.
  • Avoid going out in the blazing sun or heat when possible. If you must go outside, stay in the shade as much as possible and plan to go out early in the morning or evening when it is cooler.
  • Go to air conditioned or cool places such as shopping malls, libraries, community centres or a friend’s place.
  • If you don’t have air conditioning, keep shades or drapes drawn and blinds closed on the sunny side of your home, but keep windows slightly open.
  • Keep lights off or turned down low.
  • Wear loose fitting, light clothing and a wide brimmed hat.
  • Take a cool bath or shower periodically or cool down with cool, wet towels.
  • Avoid heavy meals and using your oven.
  • Avoid intense or moderately intense physical activity.


Symptoms of heat exhaustion include:

  • heavy sweating
  • muscle cramps
  • weakness
  • headache
  • fainting
  • paleness, tiredness
  • dizziness, nausea


People experiencing the above symptoms should seek the care of a health care provider.

Often with forecasted extreme heat, comes forecasts for poor air quality.  The Public Health would like to encourage residents to monitor the Air Quality Health Index found as a link on Environment Canada’s Weather page for Peterborough and plan outdoor activities accordingly http://weather.gc.ca/airquality/pages/onaq-013_e.html. This link can also be easily accessed on www.peterboroughpublichealth.ca in the section entitled “My Home & Environment – Air Quality – Outdoor”.


Public, air conditioned facilities such as malls, libraries and community centres are available to city and county residents seeking a place to cool off. Residents are advised to phone in advance to determine hours of operation.



For further information, please contact:

Shawn Telford
Public Health Inspector
705-743-1000, ext. 287