Heat Advisories: Stay Safe During Extreme Heat Conditions

What is a Heat Advisory?

A heat advisory is a notice issued by the National Weather Service of the United States when dangerous heat conditions are expected. Local weather offices have their own criteria for issuing a heat advisory, but it typically occurs when the heat index, which measures the combined effects of temperature and humidity, reaches or exceeds 105 degrees Fahrenheit (40.6 degrees Celsius).

Heat-Related Illnesses and Prevention

Heat-related illnesses and death are largely preventable with proper planning, education, and action. Heatgov serves as the premier source of information on heat and health. Heat-related illnesses can range from heat cramps and heat exhaustion to more serious conditions like heatstroke.

Symptoms of heat-related illnesses include:

• Heat cramps: painful muscle contractions, usually in the legs or abdomen
• Heat exhaustion: headache, nausea, dizziness, fatigue, and weakness
• Heatstroke: dangerously high body temperature (103 degrees Fahrenheit or higher), confusion, seizures, and loss of consciousness

To prevent heat-related illnesses, it is important to:

• Stay hydrated by drinking plenty of fluids, even if you don't feel thirsty
• Wear loose-fitting, light-colored clothing
• Limit outdoor activities during the hottest parts of the day
• Take frequent breaks in air-conditioned areas
• Never leave children or pets unattended in parked cars

Extreme Heat and Climate Change

Extreme heat is deadly and kills more people than any other weather event. Climate change is making extreme heat events more frequent and more severe. According to the Centers for Disease Control and Prevention, the number of heat-related deaths in the United States has increased by 50% since the 1970s.

Heat advisories are issued to help people stay safe during periods of extreme heat. By following the guidelines in this advisory, you can reduce your risk of heat-related illnesses and death.