Extreme heat events are becoming more common and intense, leading to the issuance of heat advisories in many regions. We wrote before about how to deal with the heat, but many U.S. cities are unprepared for the heat as other countries are. So, a heat advisory is a warning issued by weather authorities when high temperatures pose a risk to health and safety.

This article explores what a heat advisory means, how it differs from other heat warnings, and provides essential tips for staying safe during extreme heat in major cities like Houston, Los Angeles, Miami, NYC, Atlanta, and Phoenix.

Understanding Heat Advisories

What is a Heat Advisory?

A heat advisory is an alert issued by the National Weather Service (NWS) when temperatures are expected to be dangerously high, typically ranging from 100°F to 110°F, depending on regional thresholds.

The advisory is designed to inform the public about the potential health risks associated with prolonged exposure to heat, particularly for vulnerable populations such as the elderly, children, and individuals with pre-existing health conditions .

Heat Advisory vs. Excessive Heat Warning

While a heat advisory warns of high temperatures that pose health risks, an excessive heat warning is issued when conditions are more severe and can lead to life-threatening situations. An excessive heat warning indicates extreme heat conditions, often with temperatures exceeding 110°F and high humidity levels that significantly increase the risk of heat-related illnesses .

Is There a Heat Advisory Today?

To find out if there is a heat advisory in effect for your area today, you can check local weather reports, the NWS website, or weather apps that provide real-time updates on heat advisories and other weather alerts .

Heat Advisory Tips for Major Cities



Typical Conditions:

Houston is known for its humid subtropical climate, which can make heat advisories particularly uncomfortable. High humidity levels increase the heat index, making it feel hotter than the actual temperature.


  • Stay Hydrated: Drink plenty of water throughout the day, even if you don’t feel thirsty.
  • Limit Outdoor Activities: Avoid strenuous activities during peak heat hours (typically 10 a.m. to 4 p.m.).
  • Use Air Conditioning: Spend time in air-conditioned environments, whether at home, in public places like malls, or cooling centers .

Los Angeles

los angeles

Typical Conditions:

Los Angeles experiences dry, hot summers, with heat advisories often accompanied by wildfire risks. Low humidity levels can lead to dry heat conditions.


  • Seek Shade: Use umbrellas or hats to shield yourself from direct sunlight.
  • Wear Light Clothing: Dress in light-colored, loose-fitting clothes to help your body regulate temperature.
  • Stay Informed: Monitor local news for updates on heat advisories and wildfire warnings .


Typical Conditions:

Miami’s tropical climate means high temperatures and humidity, making heat advisories feel oppressive and increasing the risk of heat exhaustion.


  • Avoid Alcohol and Caffeine: Both can dehydrate you, worsening the effects of heat.
  • Cool Down with Water: Use wet towels or take cool showers to lower your body temperature.
  • Check on Vulnerable People: Ensure that the elderly and those with health conditions are coping with the heat .

NYC (New York City)

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Typical Conditions:

NYC’s urban heat island effect can exacerbate the impact of high temperatures, leading to heat advisories in the summer months.


  • Find Air-Conditioned Spaces: Libraries, community centers, and museums often provide relief from the heat.
  • Use Fans and Cooling Devices: Fans can help, but in extremely high temperatures, air conditioning is more effective.
  • Avoid Heat-Reflecting Surfaces: Concrete and asphalt can radiate heat, so try to walk on shaded paths .


Typical Conditions:

Atlanta’s humid subtropical climate leads to high temperatures and humidity levels, often resulting in heat advisories during the summer.


  • Hydrate with Electrolytes: Sports drinks can replenish lost electrolytes, especially if sweating profusely.
  • Stay Indoors During Peak Heat: Plan outdoor activities for early morning or evening when temperatures are cooler.
  • Watch for Heat Illness Signs: Symptoms like heavy sweating, dizziness, and nausea require immediate attention .



Typical Conditions:

Phoenix is known for its extremely hot desert climate, making heat advisories a regular occurrence in the summer.


  • Stay Indoors: Minimize outdoor exposure during extreme heat conditions.
  • Cover Windows: Use shades or blinds to keep indoor temperatures down.
  • Hydrate Continuously: Carry water at all times and drink regularly .

General Heat Safety Tips


Staying hydrated is crucial during a heat advisory. Water helps regulate your body temperature and replace fluids lost through sweating. Avoid beverages that can dehydrate you, such as alcohol and caffeinated drinks .


Wear lightweight, loose-fitting, and light-colored clothing to reflect heat and allow your body to cool effectively. Dark or tight clothing can trap heat and increase your body temperature .

Sun Protection

Use sunscreen with a high SPF to protect your skin from UV radiation. Wear wide-brimmed hats and sunglasses to shield yourself from direct sunlight. Seek shade whenever possible to minimize sun exposure .

Cooling Measures

If you don’t have air conditioning, find public places that offer a cool environment. Use fans, take cool showers, or apply cold packs to your wrists, neck, and forehead to lower your body temperature .

Recognizing Heat Illness

Learn to recognize the signs of heat-related illnesses, including heat exhaustion and heat stroke. Symptoms of heat exhaustion include heavy sweating, weakness, and nausea. Heat stroke, a more severe condition, can cause confusion, unconsciousness, and a lack of sweating despite high body temperature. Seek medical attention immediately if you or someone else shows signs of heat stroke .

Preparation for Heat Advisories

Home Preparation

Prepare your home for extreme heat by ensuring that your air conditioning units are in good working condition. If air conditioning is not available, use fans and keep windows covered during the hottest part of the day to prevent heat from entering your home .

Emergency Kit

Assemble an emergency kit that includes bottled water, electrolyte drinks, non-perishable snacks, cooling towels, sunscreen, and a battery-operated fan. This kit can be essential if power outages occur during a heat advisory .

Community Resources

Be aware of community resources available during heat advisories, such as cooling centers and public pools. Many cities offer these services to help residents cope with extreme heat. Check local government websites or news outlets for information on available resources .

Famous Heatwaves and Lessons Learned

Chicago Heat Wave (1995)

The 1995 Chicago heat wave is a tragic example of the dangers of extreme heat. It resulted in over 700 deaths, highlighting the importance of public awareness and preparedness for heat advisories. Lessons learned include the need for better communication of heat risks and the establishment of cooling centers .

European Heatwave (2003)

The 2003 European heatwave caused tens of thousands of deaths, primarily among vulnerable populations. This event underscored the need for improved heat health action plans and better infrastructure to deal with extreme temperatures .

Australia Heatwave (2009)

In 2009, Australia experienced a severe heatwave that led to widespread wildfires and significant health impacts. The event emphasized the importance of early warning systems and public education on heat safety measures .


Heat advisories are crucial warnings that help protect the public from the dangers of extreme heat. Understanding what a heat advisory means and how it differs from other warnings is essential for staying safe during high-temperature events.

Whether you are in Houston, Los Angeles, Miami, NYC, Atlanta, Phoenix, or any other city, following the tips outlined in this article can help you and your loved ones stay cool and safe during a heat advisory.

By staying informed, prepared, and vigilant, you can mitigate the risks associated with extreme heat and enjoy the summer months safely. Remember to check local weather updates for heat advisories and use community resources to stay cool during high-temperature events.

For more information on current heat advisories and safety tips, visit the National Weather Service and local government websites. Stay cool and stay safe!