Developing a harmonized heat warning and information system for Ontario: a case study in collaboration.

Area of Science:

• Public Health
• Environmental Health
• Emergency Preparedness

Background:

• Heat wave early warning systems are crucial for public health preparedness.
• Ontario previously lacked a unified system, leading to inconsistent heat warnings and public confusion.
• Independent systems and varying criteria across public health units and federal agencies created communication challenges during heat events.

Purpose of the Study:

• To describe the collaborative development of a harmonized Heat Warning and Information System (HWIS) for Ontario.
• To outline the key steps and processes involved in creating a unified heat warning system.
• To address the need for standardized heat warning criteria and public health messaging.

Main Methods:

• A 5-year collaborative process involving public health units and federal/provincial governments.
• Facilitation by a non-governmental organization to bring stakeholders together.
• Development and implementation of a harmonized HWIS Standard Operating Practice.

Main Results:

• A province-wide harmonized Heat Warning and Information System (HWIS) was established in Ontario.
• The system was implemented in 2016, standardizing notification and warning processes.
• Improved consistency in heat warning issuance and public messaging.

Conclusions:

• The development of the Ontario HWIS demonstrates a successful multi-jurisdictional collaboration.
• Lessons learned can inform the creation of similar evidence-based warning systems in other regions.
• Harmonized systems are vital for effective public health protection during extreme heat events.