Understanding Heat Alerts: Heat Advisory vs. Excessive Heat Warning Explained
As summer temperatures rise, it’s important to understand the different types of heat alerts issued by weather services.
Two common terms you’ll encounter are “heat advisory” and “excessive heat warning.” Although both alerts are designed to keep you safe during extreme heat, they serve different purposes and indicate different levels of risk. In this post, we’ll explain what each alert means and how you should react to them.
What is a heat advisory?
A heat advisory is issued when the heat index (a measure combining temperature and humidity) is expected to reach levels that could pose a health hazard. Typically, the advisory is issued when the heat index is forecast to be 100°F to 105°F (37.8°C to 40.6°C) for at least two hours.
When you receive a heat advisory:
Stay hydrated: Make sure you drink enough fluids to maintain proper hydration, water being the best option.
Limit exposure: Reduce time spent outside, especially during peak heat hours (usually between 10 a.m. and 4 p.m.).
Wear appropriate clothes: Light, light-coloured and loose-fitting clothes help keep your body cool.
Check on vulnerable individuals: Make sure children, the elderly, and people with health conditions are safe and comfortable.
What is an extreme heat warning?
Excessive heat warnings are more severe than heat advisories and are issued when the heat index is forecast to exceed 105°F (40.6°C) for an extended period of time, usually for at least two days. This warning indicates that extreme heat poses a significant health risk to the general population.
When you receive an excessive heat warning:
Look for air conditioning: Find an air-conditioned space if possible. If you don’t have air conditioning in your home, consider going to a public space like a mall or library.
Avoid physical exertion: Reduce strenuous activities and avoid outdoor exercise. If you must go outside, stop frequently in a shady or cool area.
Monitor for heat-related illnesses: Be alert to symptoms of heat exhaustion and heat stroke, such as heavy sweating, weakness, dizziness, nausea, and confusion. Seek medical attention immediately if symptoms appear.
Prepare your home: Use fans, close curtains and take other measures to keep your home cool.
Main differences between a heat advisory and an excessive heat warning
Heat Index Range:
Heat Advisory: Heat Index 100°F to 105°F (37.8°C to 40.6°C)
Excessive Heat Warning: Heat Index Above 105°F (40.6°C)
Duration:
Heat Advisory: Issued for less severe heat conditions that may last for a shorter period of time.
Excessive Heat Warning: Issued for more intense heat that will last for a longer period of time.
Risk level:
Heat Advisory: Indicates an increased risk but is generally less severe.
EXTREME HEAT WARNING: Indicates a higher risk of heat-related health problems and more immediate precautions are needed.
conclusion
Understanding the difference between a heat advisory and an excessive heat warning can help you take appropriate action to protect yourself and your loved ones during extreme heat events. By staying informed and prepared, you can reduce the risks associated with high temperatures and ensure a safe summer season.
Stay cool and hydrated, and remember to take heat warnings seriously. If you have any questions or need more information, feel free to leave a comment below!