Designed to alert decision-makers and the general public to impending dangerous hot weather and to serve as a source of advice on how to avoid negative health outcomes associated with hot weather extremes
The operation of an HHWS:
Weather forecasting
Determination of whether an “action trigger”, such as a threshold temperature or biometeorological index value having significance for health effects, is likely to be exceeded in the near future
Issuance of watch/warning messages to stakeholders in the heat–health field