Friday, 17 July 2026, 7:03
A powerful heat dome is strengthening over the western United States, bringing sweltering heat to Southern California. The National Weather Service has issued an Extreme Heat Warning for inland valleys and interior areas of Santa Barbara County, with a Heat Advisory extended for coastal zones. This event is part of a broader heat wave affecting over 100 million Americans nationwide.
According to KEYT, the heat dome will peak on Wednesday, July 15, which has been designated a Severe Weather Day by the First Alert Weather Team. Inland valleys and far interior areas could see temperatures up to 110°F, which would break most daily records. Even Santa Barbara and other beach communities are forecast to reach the 90s, a dangerous scenario as many coastal homes lack air conditioning.
ABC News reports that multiple cities in the West, including Salt Lake City and Billings, Montana, shattered all-time heat records on Sunday, July 12. The heat dome is now expanding, with extreme heat warnings stretching from Utah to Michigan. For Southern California, heat alerts remain in effect through Thursday, July 16.
Temperatures are forecast to be 10 to 17 degrees above normal, prompting heat advisories for most of the Los Angeles area, outside of coastal areas, said Mike Wofford, meteorologist with the National Weather Service in Oxnard. L.A. valleys are predicted to see triple-digit heat, with Woodland Hills expected to reach 105 to 110 degrees, he said. Although above normal, temperatures will probably fall a few degrees short of breaking records, he added.
The National Weather Service is predicting that more than 90 temperature records across the U.S. will be tied or broken this week through Wednesday — and most of those will be overnight heat records. Health experts say overnight temperatures that fail to cool down are even more dangerous than daytime temperatures that soar. Hot temperatures at night pose a bigger danger because there’s no time for the body’s core temperature to cool down and recover from daytime heat. “That’s where the health outcomes are amplified, particularly for the elderly and vulnerable communities,” said University of Georgia meteorology professor Marshall Shepherd. Just a few degrees of increased body temperature can lead to heatstroke or put too much strain on the heart. If temperatures at night don’t cool down your body, the health risks more often show up the next day, said Kristie Ebi, a public health and climate scientist at the University of Washington. “Mortality starts the second or third day” because the body’s unable to cool, she said on Monday. Being proactive is crucial during a heat wave. Early warning signs include heavy sweating, muscle cramps and headache. “It’s hard to know you’re getting in trouble with the heat. This is why we need to be more proactive,” Ebi said. It’s important to find a way to cool off, whether stepping into air conditioning or wrapping a cold towel around your neck. And health experts say don’t forget to check in on friends and family members, especially those who are older, pregnant or who have health challenges that might make it more difficult to handle the heat. Even without air conditioning at home, there are ways to find relief. Stop by a library or a mall. Sit in front of a fan and spray water on your skin. Put your feet in cold water. Soak your clothes in water. And of course, drink plenty of water.
The Central Coast faces multiple hazards. High surf with waves around 7 feet is expected, along with a risk of minor coastal flooding and sneaker waves. Residents and visitors are advised to avoid rocks and jetties. The combination of extreme heat and high surf creates a dangerous environment for beachgoers.
Young children and outdoor workers are particularly vulnerable to heat exhaustion. Officials urge everyone to stay hydrated, seek shade, and take frequent breaks. The minimal marine layer offers little relief, and overnight lows in the 60s to 70s will provide only slight cooling.
This heat wave follows a pattern of increasingly intense summer heat events in California. The state has seen a rise in heat-related emergencies in recent years, with record-breaking temperatures becoming more common. The current heat dome is being driven by a strong ridge of high pressure, which traps heat and prevents cooling.
Although it’s unclear to what extent climate change is influencing this particular heat wave, scientists have found that global warming from the burning of fossil fuels is making Western heat waves more frequent, persistent, humid and lethal.
The most dangerous heat will arrive Wednesday, but conditions remain hot through Thursday. Residents should take precautions, check on vulnerable neighbors, and avoid strenuous outdoor activities. A cooling trend is expected to begin Friday as the heat dome breaks down, bringing back the marine layer and fog.
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