Summer arrives in a blaze of heat.
Summer officially arrives Today, and Mother Nature is delivering weather to match the calendar.
The most significant heat episode of the year so far is occurring across much of Southern Ontario.
Building heat over the past couple of days will continue today with temperatures forecast to top off in the low to mid thirties.
Later Today, an approaching cold front will herald the arrival of scattered showers and thunderstorms, followed by cooler conditions Tonight.
Everyone is at risk from heat, especially older adults, infants and young children, and people with chronic illnesses.
You are advised to 1) drink plenty of cool liquids before feeling thirsty, and 2) keep cool by dressing for the weather and spending a few hours each day in a cool place.
Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.