A scorching heat wave is gripping a large portion of the United States, potentially endangering the well-being of millions of people in multiple states. Meteorologists are predicting that this stifling heat could break daily record highs and persist throughout the week, marking the first major heat wave of the summer, according to the National Weather Service (NWS).

The NWS described the duration of this heat wave as notable, possibly making it the longest experienced in decades for some locations. The Midwest felt the brunt of the sweltering temperatures on Sunday, and in the coming days, the scorching conditions are expected to spread to the Great Lakes, Northeast, and Mid-Atlantic regions, affecting major cities such as New York, Chicago, Philadelphia, and Indianapolis.

The local heat index, which takes into account both the air temperature and relative humidity, could reach a staggering 105 degrees in certain areas, warns the NWS. Even as far north as Vermont and New Hampshire, temperatures in the 90s could be observed. Overnight relief from the heat may be minimal as metropolitan areas are expected to experience overnight temperatures in the mid-70s.

While this is the first significant heat wave of the year, it is worth noting that extreme weather events, including heat waves, are becoming more frequent and intense due to climate change. Just earlier this month, a heat dome blanketed much of the western and southwestern U.S., resulting in temperatures over 100 degrees and issuing heat warnings for millions of Americans.

Health officials are urging people to take extra precautions as the temperatures soar, as extreme heat can have detrimental effects on health. The NWS reports that heat-related illnesses are one of the leading causes of weather-related deaths in the country. Infants, young children, pregnant women, older adults, and those with chronic medical conditions are especially vulnerable.

Symptoms of heat exhaustion, such as headache, nausea, dizziness, sweating, and thirst, should not be taken lightly. If experiencing heat exhaustion, individuals should move to a cooler place, sip water, and cool themselves down by removing unnecessary clothing or using cold compresses. Heat stroke, a more severe condition, can cause confusion, loss of consciousness, profuse sweating, and extremely high body temperatures. In case of suspected heat stroke, it is crucial to call 911 and move the person to a cooler place, but avoid giving them anything to drink.

As the heat wave persists, it is essential for individuals to stay informed on weather updates, take necessary precautions, and prioritize staying hydrated and cool.