Blockbuster heat wave in forecast isn't normal summer heat

Key Points:

• The National Weather Service forecasts a significant and dangerous heat wave with triple-digit temperatures and record-breaking heat indices across much of the Central and Eastern U.S. from late June through at least July 4, potentially extending further into July.
• Overnight temperatures are expected to remain unusually high, with lows in the low 80s to possibly 90 degrees, reducing nighttime relief and increasing risks of heat-related illnesses, especially for vulnerable populations.
• The heat wave will affect areas east of the Rocky Mountains, including the Ohio Valley, Mid-Atlantic, and Southeast, while the Rockies and Northwest may experience cooler-than-normal temperatures and even high-elevation snow.
• On July 3-4, large portions of the central and eastern U.S. face moderate to high risks of extreme heat, with some areas possibly experiencing highs over 100 degrees and feels-like temperatures near 110 degrees.
• Authorities advise limiting outdoor activities, staying hydrated, using air conditioning, and checking on vulnerable individuals to stay safe during the prolonged heat event.