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Understanding Temperature Rise Notifications: Essential Information for U.S. Residents

June 18, 2026 · The Clime Team
Understanding Temperature Rise Notifications: Essential Information for U.S. Residents

Temperature rise notifications are critical alerts issued by weather authorities to inform the public about impending heat events that could pose health risks. In the United States, these notifications are primarily issued by the National Weather Service (NWS) and are designed to help individuals and communities prepare for extreme heat conditions.

What Are Temperature Rise Notifications?

Temperature rise notifications, often referred to as heat advisories or warnings, are official communications that indicate the likelihood of high temperatures that may lead to heat-related illnesses. These alerts are based on the Heat Index, which combines air temperature and humidity to determine the apparent temperature—the temperature it feels like to the human body. For instance, a temperature of 95°F with a relative humidity of 65% can feel like 121°F. (weather.gov)

Types of Heat Alerts

The NWS issues several types of heat-related alerts, each with specific criteria:

  • Heat Advisory: Issued when the Heat Index is expected to reach or exceed 100°F for at least two consecutive days. This indicates conditions that are dangerous for the general population. (weather.gov)

  • Excessive Heat Watch: Issued when conditions are favorable for an excessive heat event in the next 12 to 48 hours. It serves as a heads-up for potential extreme heat. (weather.gov)

  • Excessive Heat Warning: Issued when the Heat Index is expected to reach or exceed 110°F and not fall below 75°F for at least 48 hours, beginning in the next 12 to 48 hours. This indicates a significant threat to life and health. (weather.gov)

How Are These Alerts Disseminated?

The NWS disseminates heat alerts through various channels to ensure widespread awareness:

  • NOAA Weather Radio: Continuous broadcasts of official Weather Service information, including heat alerts. (weather.gov)

  • Local Media: Radio and television stations receive and broadcast NWS alerts. (weather.gov)

  • Mobile Applications: Many smartphone apps provide NWS alerts, including heat warnings. (weather.gov)

  • Wireless Emergency Alerts (WEA): Short emergency messages sent by authorized authorities to alert people about emergencies in their area.

Why Are These Alerts Important?

Heat-related illnesses are a significant health risk, especially during prolonged periods of high temperatures. By issuing these alerts, the NWS aims to:

  • Prevent Heat-Related Illnesses: Educate the public on the dangers of heat and the importance of hydration and cooling measures.

  • Encourage Preparedness: Prompt individuals and communities to take necessary precautions, such as rescheduling outdoor activities and ensuring access to cooling centers.

  • Save Lives: Reduce the number of heat-related fatalities by providing timely information.

How Can You Stay Informed?

To stay informed about heat alerts in your area:

  • Monitor Official Sources: Regularly check the NWS website or your local NWS office for updates.

  • Use NOAA Weather Radio: Keep a battery-powered or hand-crank NOAA Weather Radio to receive continuous broadcasts of official information. (weather.gov)

  • Enable Wireless Emergency Alerts: Ensure your mobile device is set to receive emergency alerts.

  • Stay Connected with Local Authorities: Follow local government and emergency management social media accounts for real-time updates.

What Should You Do When a Heat Alert Is Issued?

When a heat alert is issued, take the following precautions:

  • Stay Hydrated: Drink plenty of water throughout the day.

  • Limit Outdoor Activities: Reschedule strenuous activities to cooler parts of the day or postpone them altogether.

  • Seek Cool Environments: Stay in air-conditioned spaces or visit public cooling centers.

  • Check on Vulnerable Individuals: Ensure that children, the elderly, and those with medical conditions have access to cooling and hydration.

Conclusion

Temperature rise notifications are vital tools in safeguarding public health during extreme heat events. By understanding these alerts and taking appropriate actions, individuals can significantly reduce the risks associated with heat-related illnesses.

Highlights:

  • Heat Safety
  • Heat Information Page

Frequently Asked Questions