Nationwide Heat Wave to Grip Lower 48 States

Above-normal temperatures are anticipated for the entire lower 48 states as summer heat arrives nationwide. Much of the country can expect high temperatures well into the 80s and 90s, with some areas potentially reaching 100s, accompanied by increasing humidity. This period of record heat is driven by a powerful ridge of high pressure expected to form across the nation.

This high-pressure system, a common summertime occurrence, causes air to sink, compress, and warm, leading to clear skies and hotter weather. The East Coast, in particular, is set to experience significant heat risk impacts. Warm overnight low temperatures in the Mid-Atlantic could pose moderate to major risks for those lacking adequate cooling and hydration.

While most areas will experience warmer-than-average temperatures, a brief cooler period might affect the western U.S. next week due to a frontal system. However, temperatures are expected to rebound quickly, with significant warming anticipated across the Pacific Northwest, California, and the Southwest. The western U.S. is forecast to see the longest duration of warmth, potentially lasting into late June.

Heat safety remains paramount. Experts advise using sunscreen, wearing light-colored and loose-fitting clothing, and staying hydrated with multiple water bottles. It's crucial to avoid leaving children or pets in cars and to seek shade and air conditioning. Vulnerable populations, including children, individuals over 65, and pregnant people, face increased risks from extreme heat.