More than 170 million Americans are under heat alerts this week as scorching temperatures and high humidity settle over the central and eastern U.S., with the Northeast among the hardest hit regions.
Heat dome intensifies across the East
A massive heat dome has formed over much of the country, with the National Weather Service (NWS) issuing heat advisories and excessive heat warnings from the Midwest to the Northeast. Temperatures are expected to soar above 90°F for consecutive days, with AccuWeather RealFeel® values topping 100°F—and in some cases, pushing toward 120°F.
“Extreme heat is the leading cause of weather-related deaths in the U.S.,” warned AccuWeather Chief Meteorologist Jonathan Porter. “With this being the first heat wave of the season for many, people are especially vulnerable.”
Sweltering nights offer little relief
Meteorologists are particularly concerned about nighttime conditions. Urban centers like New York City, Philadelphia, and Washington, D.C., may struggle to cool below 80°F at night, increasing health risks, especially for older people and those without air conditioning.
Cities to watch: New York, Philadelphia, D.C., Boston
- New York City: Several days of 90°F+ temperatures expected; Central Park could hit 100°F.
- Philadelphia & D.C.: Forecast includes seven consecutive days above 90°F.
- Boston & Northeast Corridor: Humidity and sun intensity may bring RealFeel® values near or above 105°F.
Cooling centers are likely to be activated in many urban areas as health departments brace for heat-related emergencies.
Rising energy demands, health risks
With the heat wave arriving just after the summer solstice, long daylight hours and intense sunshine are compounding the situation. Air conditioners are running nonstop, straining power grids and driving up energy demand.
Heat-related illnesses, including heat exhaustion and heatstroke, are major concerns. Outdoor workers, children, older residents, and pets are especially at risk.
AccuWeather’s RealFeel® and safety tips
The AccuWeather RealFeel® Temperature calculates how it actually feels by factoring in humidity, wind, solar radiation, and other conditions. In some regions, the RealFeel® Shade™ Temperature provides a safer gauge for shaded conditions.
Tips to stay safe:
- Stay hydrated
- Avoid strenuous outdoor activity during peak afternoon hours
- Take frequent breaks in cool or shaded areas
- Use air conditioning or cooling centers if available
Beaches may offer a break—but be cautious
This weekend marks a welcome return of dry, sunny weather for much of the mid-Atlantic and Northeast. However, AccuWeather warns that ocean and lake temperatures remain unseasonably cold, with risks of cold water shock for swimmers.
Water temps:
- Maine to New Jersey: 40s–60s°F
- Delmarva to Virginia: 70s°F
- Carolinas south: 80s°F
Cold water shock can cause severe cramps and breathing difficulties, even for experienced swimmers.
What happens next
The heat wave is expected to peak in intensity early next week, with many areas remaining above average for several days. Relief may come with scattered storms on the periphery of the heat dome, but widespread rain is unlikely in the core affected regions.
Authorities urge residents to monitor forecasts and heat advisories closely. Visit AccuWeather.com or your local NWS page for updates.
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