JACKSONVILLE, Fla. -- Heat index temperatures are expected to reach between 104 and 108 degrees and Jacksonville officials urge residents to use caution when outdoors.
The heat index is a measure of how it feels when the effects of humidity are combined with the temperature. A heat index of 105 degrees is considered the level where people begin to experience extreme discomfort or physical stress.
People planning on working or doing outdoor activities should avoid overexertion and stay hydrated by drinking plenty of water and taking at least hourly breaks in the shade or air conditioning.
The heat index is measured under shady conditions and it's important to know that direct exposure to sunlight can increase the heat index as much as 15 degrees.
Use caution with pets as well, who also suffer from excessive heat. Pets need plenty of water as well and a shady place to rest. Do not leave pets in the car, even if the windows are cracked. Temperatures inside a car with the windows up can quickly reach over 150 degrees, which can result in a heat stroke and death.
For more information on the heat index or heat related illness symptoms and first aid, visit JaxReady, the Duval County Health Department or the National Weather Service websites.
First Coast News