Summer Heat Wave to Sweep Across Eastern US

A major heat wave is set to blanket much of the eastern and central United States this week, bringing temperatures well above normal as the July Fourth holiday approaches. The National Weather Service has flagged this as a serious heat risk, with high humidity making conditions feel even hotter than the actual temperatures. While parts of the Southwest, like Phoenix and Texas, are already pushing 100°F (38°C), the heat will soon spread eastward, adding to already dangerous wildfire conditions in the West. Over 130 million people across the southern and Great Plains states were already under heat advisories on Sunday. Those warnings are expected to grow as temperatures climb higher midweek. Cities from the Great Lakes to the East Coast—including Chicago, New York, and Washington—could see record-breaking highs. Some areas might even hit their hottest temperatures of the year, coinciding with holiday celebrations and events.

Humidity will make matters worse. The heat index, which combines temperature and moisture, could push "feels-like" temperatures to 115°F (46°C) in the worst-hit regions. That’s dangerous for anyone outdoors, not just vulnerable groups like kids or the elderly. Even nighttime won’t bring much relief, with lows staying in the 70s or 80s in cities like New York. Without air conditioning, sleeping could be tough for many residents. Meteorologists warn this isn’t just a passing heat wave. A strong high-pressure system, sometimes called a "heat dome, " will block storms and keep the heat locked in place. That means little rain and worsening drought conditions in some areas. Meanwhile, the West faces another problem—extreme dryness and wind could fuel fast-spreading wildfires, especially near the Colorado-Utah border, where three firefighters died in a recent blaze. Officials urge people to stay indoors, drink plenty of water, and seek cool spaces if possible. High heat can be deadly, especially when combined with physical activity or poor hydration. As temperatures rise, cities brace for a tough week ahead, with health risks and discomfort affecting millions.

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