The Greater Montreal area is under a heat warning on Wednesday, with temperatures expected to exceed 30 degrees Celsius and humidex values hitting 40. “The overnight period will be uncomfortable with lows exceeding 20 degrees Celsius Thursday into Friday,” Environment and Climate Change Canada (ECCC) states. Heat warnings are issued when very high temperatures or humidity pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion. Heat safety High body temperatures can cause grave injury or lead to death. The Quebec Health Ministry is asking people to take precautions during the hot weather: Signs of heat illness include swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions. “Reduce your heat risk,” Environment and Climate Change Canada notes. “Schedule outdoor activities during the coolest parts of the day.” Anyone with health-related questions is encouraged to call Info-Santé at 811. In case of emergency, call 911. Child safety Pool safety In Quebec, one child a day arrives in an emergency room for drowning or near-drowning during the summer, according to the Montreal Children’s Hospital. In the last 30 years, the MCH trauma centre says it has seen more than 400 drownings and near-drownings. Data show that 73 per cent of the incidents occurred in residential pools, park pools, aquatic centres and water parks. Some ways to prevent drowning hazards: