Heat and air-quality warnings issued as humidex spikes to 41°C on July 15

Heat and air-quality advisories are in effect for parts of the region on Wednesday as expected conditions include a mix of sun, cloud, showers and thunderstorms with a daytime high of 32°C and a humidex that could reach about 41.

What to expect today

Forecasters are calling for generally warm to hot conditions, punctuated by a risk of scattered showers and thunderstorms through the day. The combination of high temperatures and elevated humidity will drive the humidex into the low 40s in affected areas, increasing the risk of heat-related illness and exacerbating poor air quality.

• Forecast high: 32°C
• Humidex: up to 41
• Conditions: sun, cloud, showers and thunderstorms
• Health notices: heat and air-quality warnings in effect

Impacts and precautions

Hot, humid conditions with high humidex values can increase the physiological strain on people, particularly older adults, young children, those with chronic illnesses and outdoor workers. Elevated pollution or stagnant air associated with heat patterns can worsen respiratory conditions.

Recommended precautions include:

• Limit strenuous outdoor activity during the warmest parts of the day.
• Stay hydrated and seek air-conditioned or cooler environments when possible.
• Check on vulnerable neighbours, family members and friends.
• Follow local public-health or air-quality advisories if you have respiratory issues.

Thunderstorms — stay alert

Scattered thunderstorms are possible. Even without widespread severe storm development, localized storms can produce sudden heavy rain, gusty winds and lightning. People outdoors should be prepared to seek shelter quickly and avoid low-lying areas prone to rapid water accumulation.

Monitor local forecasts and official advisories for updates as conditions evolve through the afternoon and evening. When heat and poor air quality coincide, taking precautions can reduce the risk of heat stress and respiratory problems.