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Harmonized Heat Warning and Information System for Ontario (HWIS

Environment and Climate Change Canada; Health Canada; Ontario Ministry of Health and Long-Term Care; Public Health Ontario

The Heat Warning and Information System (HWIS) is a coordinated provincial system that provides a consistent approach for processing and issuing heat warnings in Ontario, in order to better protect residents, vulnerable community members and visitors during the summer season. It was developed jointly by Environment and Climate Change Canada, Health Canada, the Ontario Ministry of Health and Long-Term Care, and Public Health Ontario, in consultation with provincial health units.

The HWIS provides criteria for issuing heat warnings. These criteria were selected after an extensive review of epidemiological evidence about the links between temperature, humidity, and health outcomes including mortality and illness.

The EOHU receives weather forecasts from Environment and Climate Change Canada (ECCC) in advance of issuing a heat warning. Based on ECCC’s heat warning, the Medical Officer of Health may issue a local Heat Warning if conditions are forecasted to last at least 2 days, or an Extended Heat Warning if conditions are forecasted to continue for 3 or more days.

Once the Medical Officer of Health declares a Heat Warning or Extended Heat Warning, notification of key response partners, community agencies and the public is initiated. Hot weather response activities focus on protecting vulnerable groups at increased risk for heat-related illness.


This platform displays census-tract level surface urban heat island (SUHI) intensities for US urbanized areas (polygons with red boundaries), as well as socioeconomic information at the same level of aggregation. Use the search bar to find your urbanized area of interest. Click your neighborhood, and the corresponding SUHI and population statistics will be listed below.


The SUHI intensity, as calculated here, is the difference in surface temperature between the built-up and non-built up pixels of an urbanized area. Since these estimates are based on satellite observations, they are valid for clear-sky conditions. More information about the methodology used to generate this dataset can be found in: Chakraborty, T., Hsu, A., Manya, D., & Sheriff, G. (2020). A spatially explicit surface urban heat island database for the United States: Characterization, uncertainties, and possible applications., ISPRS Journal of Photogrammetry and Remote Sensing

Warning System

Sistema de Alerta Temprana por Olas de Calor y Salud - Argentina

SMN Argentina | 2020

A nivel global, existen evidencias contundentes de los riesgos a la salud frente al exceso de calor o temperaturas muy elevadas. El SAT-OCS anticipa a la población acerca de situaciones meteorológicas extremas y sus posibles efectos en la salud y mortalidad. El objetivo es que tanto la población como los organismos de protección civil puedan tomar las medidas de prevención, mitigación y de respuesta adecuadas a cada nivel de alerta.

Este Sistema se basa en los resultados del proyecto de investigación “Mortalidad por olas de calor en el semestre cálido 2013-2014 en las regiones del centro y norte de la República Argentina. Estudio ecológico”, realizado por un equipo interdisciplinario conformado por profesionales de las ciencias de la salud, de las ciencias sociales y de las ciencias de la atmósfera, entre los cuales se contó con integrantes de Ministerio de Salud de la Nación y del Servicio Meteorológico Nacional. En esta investigación se analizaron y caracterizaron los efectos de las olas de calor del semestre cálido (octubre a marzo) 2013-2014 sobre la mortalidad en la región centro-norte de la Argentina, evidenciando un aumento significativo de la mortalidad bajo ola de calor.

Interactive Map

The Future of Extreme Heat by Congressional District

Union of Concerned Scientists | 2019

This interactive map allows you to download district-specific fact sheets for all 433 Congressional districts in the contiguous United States. (Fact sheets are also available in Spanish.) You can move and zoom the map to your area of interest. Click on any district to access the download link.


You can also learn more about how to use the map and fact sheets, including ways to ensure elected officials and candidates are aware of this information.


Information is drawn from the July 2019 report, Killer Heat in the United States: Climate Choices and the Future of Dangerously Hot Days, which highlights the rapid, widespread increases in extreme heat that are projected to occur over the coming decades due to climate change.


The results highlight the stark choice before us: We can continue on our current path, where we fail to reduce heat-trapping emissions and extreme heat soars. Or we can take bold and rapid action now to reduce emissions and prevent the worst from becoming reality.


Intervention Benefits Calculator

Heat Resilient Cities Benefits Tool

C40 Cities | 2020

The impact of extreme temperatures on health and wellbeing is rising up policy agendas in many cities. The Excel-based Heat Resilient Cities benefits tool has been designed to help city planners and decision-makers to quantify the health, economic and environmental benefits of common urban heat adaptation actions. Cities can use this information to make the case for urban heat adaptation investments, and to prioritise the actions that are likely to have the most positive impact locally.

Users can calculate the benefits brought by specific parks and green infrastructure, water bodies such as rivers and lakes, and cool and vegetative surfaces. The tool can also extrapolate results from these specific investments to calculate the benefits of scaling-up across the whole of the city.

The tool was developed with guidance from cities which participate in the C40 Cool Cities Network, and from urban heat and health impact specialists. It has been piloted with the cities of Medellín and São Paulo – read below for a flavour of the results for both cities, or the case studies for full details.

Access the Heat Resilient Cities benefits tool and calculate benefits for your city’s actions via the Download button on this page. The tool will also soon be available here in Spanish. Instructions for using the tool are given in the first two tabs (Intro and Workflow) of the Excel file. Contact Neuni Farhad and Snigdha Garg with any questions about how to use the tool and interpret the results. You can also learn how the tool was developed in the methodology note.


EM-DAT: The International Disaster Database


EM-DAT provides an objective basis for vulnerability assessment and rational decision-making in disaster situations. For example, it helps policymakers identify the disaster types that are most common in a given country and that have had significant historical impacts on human populations. In addition to providing information on the human impact of disasters – such as the number of people killed, injured or affected – EM-DAT provides disaster-related economic damage estimates and disaster-specific international aid contributions.

Warning System

Heat-Health Watch (UK)

UK Met Office

The Heat-Health Watch Service is designed to help healthcare professionals manage through periods of extreme temperature. The service acts as an early warning system forewarning of periods of high temperatures, which may affect the health of the UK public.

The Heat-Health Watch Service operates in England from 1 June to 15 September each year, in association with Public Health England. This is the period when temperature thresholds are most likely to be reached. However, should thresholds for an alert be reached outside of this period, an extraordinary heat-health alert will be issued and stakeholders are advised to take the usual public health actions.

The Met Office forecasts day-time and night-time maximum temperatures, which are monitored regionally. When certain heat thresholds are passed, a warning is issued and sent to relevant health professionals and people working in social care as well as displayed on our website. This enables health professionals to take action to minimise the impact of the heat on people’s health.

Warning System

Heat Health Watch Warning System (France)

Meteo France

Advisories and monitoring of high temperatures occurs in France between June and August. Meteo France coordinates and collaborates with the Ministry of Health to issue warnings about potential heatwaves.

Warning System

Heatwave Service for Australia

Australian Government Bureau of Meteorology

National heatwave monitoring and forecasting service for Australia. Provides monitoring from the past two three day periods and forecasts heatwaves for the next three to five days.

Warning System

National Weather Service (US)

US National Oceanic and Atmospheric Administration (NOAA)

Heat-health warning system for the U.S. Each NWS Forecast Office issues a specific forecast for their region. They also provide a contiguous U.S. forecast map of maximum and minimum temperatures in real-time and maximum heat index forecasts.

Risk Map

Extreme Heat Risk Map

The European Environment Agency (EEA)

Online interactive GIS map of the heatwave risk of European cities based on historical data and climate change projections.




Medium range heatwave forecasts for Europe for 1-9 day lead times. Forecasts are updated each day and issued for the next 9 days. The forecasts from the past nine days are also available so users can monitor the development of the event.

Warning System



Provides extreme heat warnings and alerts for Europe. Information is displayed on an interactive map with available reports and warnings that can be downloaded for each country that have high alerts.

Warning System

NOAA Climate Prediction Center

US National Oceanic and Atmospheric Administration (NOAA)

Provides forecasts for excessive heat and above normal temperatures for the United States at 3-7 day lead times.

Mobile App

Heat Safety Tool

US Occupational Safety and Health Administration (OSHA)

This mobile application lets outdoor workers and supervisors calculate the heat index for their worksite. Based on the heat index, the app indicates the risk level to outdoor workers. Users can get suggestions about actions to take at different risk levels to protect workers from heat-related illness. The app is available for Android and iPhone devices, in English and Spanish.

Knowledge Base

Cool Roofs and Cool Pavements Toolkit

Global Cool Cities Alliance

Repository for cool surface and urban heat island information. The Knowledge Base is a user-friendly tool to find research, program materials, sample documents, presentations, case studies, codes and standards, videos, images and other relevant items from around the world.

Mobile App

Predicted Heat Strain Mobile Application

University of Queensland

This freely available application allows investigators to input a number of parameters associated with the environment, task and individual to evaluate the work scenario’s potential risks and controls without requiring access to a computer. Based on the input data, the app uses a number of algorithms to produce predicted core body temperature and water loss graphs and reports. It is envisaged that the app will become a useful tool for the practicing occupational health and safety professional in the investigation and control of heat stress in the field.

Knowledge Base

Mobile App


This tool can identify in real time the city areas that suffer most during the ongoing event, indicating thus where the victims are to be expected. EXTREMA uses real-time satellite data, along with other model and city-specific data to estimate the temperature, humidity, and discomfort index for every square kilometer in the city. Temperature estimates are updated every 5 minutes, providing data at a spatial and temporal resolution that is not available from any other service.

Data Explorer

Lancet Countdown on Health and Climate Change data explorer


This platform allows users to engage with our findings and explore the 2019 report data at country specific, regional and income group level. The data visualisations are free to use and share

Data Explorer

Data and figures: Number of extreme heat waves in future climates under two different climate forcing scenarios

European Environment Agency (EEA)

The maps and data show the median of the number of heat waves in a multi-model ensemble of the near future (2020–2052) and the latter half of the century (2068–2100) under the RCP4.5 scenario, and for the same time periods but under RCP8.5

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