Heat maps are visual representations of data, using color-coding to display the intensity of different variables. In the context of weather, a heat map might show the temperature throughout the day, with cooler temperatures represented in blue or green and hotter temperatures in orange or red. These maps often incorporate humidity levels, which contribute to the heat index – a measure of how hot it feels to the human body when relative humidity is combined with the air temperature. A high heat index indicates a greater risk of heat exhaustion or heatstroke.