More than 134 million people are currently under heat alerts as a brutal and potentially historic heatwave grips the United States on Independence Day. Forecasters are predicting soaring temperatures with little relief in sight over the next week, even after dark. The prolonged duration of the extreme event, coupled with high overnight temperatures, increases the danger to human health and raises the risk of rapid wildfire spread.

"This is going to be a severe, prolonged, potentially record-breaking heatwave," warned climate scientist Dr. Daniel Swain. Temperatures are expected to spike up to 115F (46C) in California's interior, the desert southwest, and parts of Oregon, according to the National Weather Service (NWS). The heat is set to spread north into Oregon and Washington, causing highs to soar throughout the western region. Several locations, including Las Vegas and Redding, California, could potentially see all-time heat records shattered during this heatwave.

The NWS forecasters have cautioned that the intensity and long duration of the heatwave pose a serious risk to everyone. They advise residents in impacted areas to stay inside, stay hydrated, and check on vulnerable neighbors. The heatwave is particularly hazardous in areas like the San Francisco Bay Area, where many homes and businesses are not equipped with air conditioning.

Unfortunately, forecasters fear that there may be a number of heat-related fatalities throughout this event. The unhoused population and those who cannot access or afford cooling are particularly vulnerable. NWS agencies across the country are urging residents to take the heatwave seriously, especially during outdoor activities connected to Independence Day celebrations, such as picnics and parades, as well as consuming alcohol or other dehydrating beverages.

The extreme heatwave is caused by a ridge of high pressure off the west coast and a separate ridge that has led to heat warnings and advisories stretching from Kansas and Missouri to the Gulf coast states, according to the NWS. The timing of the heatwave, coinciding with Fourth of July celebrations, raises the risk of wildfires due to fireworks, barbecues, and other flammable materials.

Firefighters are already battling multiple blazes across California, including the Thompson fire near Oroville. Evacuations have been ordered as the fire quickly spread, affecting over 3,000 acres. To prevent wildfires, Pacific Gas & Electric implemented public safety power shutoffs in parts of 10 counties where downed or damaged electrical wires could ignite fires. The excessive heat and dry, windy conditions are expected to worsen the wildfire threat throughout the summer.

While this heatwave may be the worst so far this year, experts warn that it is part of a troubling trend. The human-caused climate crisis is expected to result in more frequent and intense heat events. 2024 is projected to become the hottest year on record. Extreme heat is the most deadly type of weather-related disaster, and the toll is already rising.

The dangerous weather conditions this week pose health risks to the majority of the population, especially those unable to access cooling. Sacramento resident Katherine Powers, who is homeless, highlighted the difficulty of staying cool in this extreme heat. She mentioned the challenges of visiting cooling centers due to the possessions she carries, opting instead for parks with water fountains and shaded areas.

As this historic heatwave continues to grip the nation, it is crucial for individuals and communities to take necessary precautions to protect themselves and stay safe amidst the blistering temperatures and heightened fire risk.