Millions Told To Avoid Sun in 13 States: 'Deadliest Weather Phenomenon'
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Heat-related advisories were in effect for millions across 13 states on Monday, with the National Weather Service (NWS) warnings of "dangerously hot conditions" in some parts of the country.
Why It Matters
The Centers for Disease Control and Prevention says extreme heat can lead to heat-related illnesses, especially in older adults, young children, and individuals with chronic medical conditions.
Symptoms to watch for include heavy sweating, muscle cramps, dizziness, and nausea. The CDC notes that extreme heat is responsible for more than 700 deaths annually in the U.S.
Rising temperatures can also elevate ground-level ozone, which presents additional health risks.
File photo: People cool off in a fountain at Washington Square Park on June 25, 2025 in New York City.
File photo: People cool off in a fountain at Washington Square Park on June 25, 2025 in New York City.What To Know
Extreme heat warnings, which the NWS issues when "extremely dangerous heat conditions are expected or occurring," covered southern Arizona and neighboring regions of southeastern California.
Phoenix and its surrounding areas could see afternoon temperatures between 110 and 118 degrees Fahrenheit, the NWS said.
"Don't underestimate the heat! It is the deadliest weather phenomenon in the U.S.A.," the NWS says.
In southwest Arizona and southeast California, temperatures up to 116 degrees Fahrenheit were expected.
"Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening," the agency said. "Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose-fitting clothing when possible and drink plenty of water."
Meanwhile, less-severe heat advisories, which the NWS issues "for dangerous heat conditions that are not expected to reach warning criteria," were in place for portions of Nevada, Idaho, Oregon, Washington, Arkansas, Louisiana, Mississippi, Tennessee, Delaware, Pennsylvania, and New Jersey.
Afternoon highs nearing or entering the triple-digits were forecast across these areas. The NWS advised staying out of the sun and finding an air-conditioned room. "Young children and pets should never be left unattended in vehicles under any circumstances," the service said.
The advisories come after a heat dome engulfed the country last week, which saw temperature records broken in multiple states. Philadelphia reached 101 degrees Fahrenheit last Tuesday, surpassing a record more than a century old and marking its first 100-degree reading since July 2012, according to AccuWeather. Northern New York also tied historical records, with Plattsburgh hitting 101 degrees Fahrenheit the day prior.
What People Are Saying
The National Weather Service forecast office, Phoenix, Arizona, said on X, formerly Twitter, Sunday: "High temperatures across the lower deserts this afternoon were around 110-114°. Highs are forecast to be even hotter tomorrow and near record levels. Make sure to stay hydrated and limit your time outdoors, especially during the heat of the day."
NWS Little Rock, Arkansas, said on X, Monday: "Showers and thunderstorms will once again be possible this afternoon and evening as a disturbance pushes through the state. Additionally, temperatures are expected to be hot today with a heat advisory in effect for central and eastern Arkansas through the evening hours."
What Happens Next
At the time of writing, the latest extreme-heat warnings were in effect until 8 p.m. on Tuesday.
The NWS issues regular forecast updates on its website.
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