Adapted heat warning system and recommendations for action

Urban areas are characterized by the Urban Heat Island (UHI) effect and other changes in the urban environment that lead to increased thermal stress compared to rural areas. According to the guidelines of the Sendai Framework for Disaster Risk Reduction 2015-2030, administrations should also be strengthened at the local level to minimize future risks. Therefore, it is necessary to evaluate the heat stress and risk of people in urban areas to make appropriate decisions.


Thermal comfort of people is accessible through thermal indices (e.g., Felt Temperature) that combine meteorological parameters (air temperature, vapor pressure, wind speed, wind direction, and global radiation). The thermal indices, which also take into account the thermo-physiology of humans, provide a way to quantify the impact of human thermal environments and will serve as a basis for setting thresholds in heat-related mortality. Official heat warnings in Germany are based on the felt temperature for severe and extreme heat and the heat mortality statistically related to it.


The urban morphology as well as the green infrastructure change the meteorological parameters and thus the thermal comfort of humans on the small-scale micro scale and is thus of importance in the course of climate change.


The aim of the subproject is the implementation of a specific heat warning system for the city of Karlsruhe under the influence of vegetation and urban structures. The specific heat warning system will take into account short- and long-term measures for heat reduction and provide recommendations for action.