Extreme Heat Warning: Stay Safe and Informed

What Is an Extreme Heat Warning?

An Extreme Heat Warning is issued by the National Weather Service (NWS) when dangerous heat conditions, based on heat index criteria, are expected or occurring within 12 hours Source 1. It signals significant health risks from prolonged high temperatures above 90°F combined with humidity, lasting 2–3 days or more Source 3.

Health Risks and Vulnerable Groups

Extreme heat strains the body, leading to illnesses like heat exhaustion, heatstroke, and dehydration Source 2. Vulnerable populations include the elderly, children, outdoor workers, and those with chronic conditions Source 6. It can exacerbate issues like wildfires and poor air quality Source 8.

Preparation and Safety Tips

Stay hydrated, avoid midday outdoor activities, and seek air-conditioned spaces Source 5. Wear lightweight clothing, use fans or cool baths, and monitor for symptoms like dizziness Source 9. Tools like NWS HeatRisk and Heat.gov provide real-time alerts Source 4 Source 7.

Key Resources

• NWS: weather.gov/safety/heat-ww
• CDC: cdc.gov/climate-health
• Ready.gov: ready.gov/heat
• Heat.gov: heat.gov for national tracking

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FAQ

What triggers an Extreme Heat Warning?

It’s issued when the heat index reaches specified dangerous levels within 12 hours, per NWS criteria, indicating imminent health threats Source 1.

How does an Extreme Heat Warning differ from a Heat Watch?

A Warning means dangerous heat is occurring or imminent; a Watch signals potential risks 12–48 hours ahead Source 9.

Who is most at risk during extreme heat?

Elderly, children, pregnant people, and those with health conditions face higher risks of heat-related illnesses Source 2.

What should I do if an Extreme Heat Warning is issued?

Stay indoors in cool areas, drink water, avoid strenuous activity, and check on vulnerable neighbors Source 5.

How can I track extreme heat alerts?

Use Heat.gov for real-time U.S. advisories or NWS HeatRisk for personalized risk assessments Source 7 Source 4.

Can extreme heat cause long-term effects?

Yes, repeated exposure may worsen chronic conditions and contribute to broader environmental hazards like air quality decline Source 8.