Extreme heat scorches July Fourth celebrations. How to stay safe

Many governors and public officials warned residents of the dangerous heat in their states on July 4. Here's how hot it will be and how to stay safe.Show Caption

An oppressive heat dome is bringing extremely hot temperatures to much of the United States on July Fourth – adding an ingredient of danger to traditional outdoor Independence Day festivities and America 250 celebrations.Several governors went onto social media warning residents ahead of temperatures expected to be 10 to 20 degrees above average across the eastern part of the U.S. "Please be cautious of the extreme heat," New Jersey Gov. Mikie Sherrill posted on X. "Limit your time outdoors – especially during the hottest times of the day – and drink plenty of water."Dangerously hot conditions and heat index values of 110 to 115 were forecast for parts of Maryland, Virginia and Washington D.C. "The extreme heat we are feeling in Virginia is not letting up this weekend," Virginia Gov. Abigail Spanberger posted on X. "Please do your part to let our first responders and health care professionals enjoy the 4th of July, too. Take precautions now so you don’t have to make a trip to urgent care. Stay safe, stay hydrated, and stay cool, Virginia!"The annual Independence Day Parade in Washington, D.C., was canceled due to the heat. "It's going to be a very long, busy, hot day in DC. ‌ With temps over 100°, it's important to be mindful about drinking water, seeking shade, and limiting time outdoors," Mayor Muriel Bowser posted on X.How hot will it get on July 4th?Many daily temperature records are expected and long-time heat records will be threatened in some locations, with temperatures topping 100 forecast from North Carolina to Pennsylvania and New Jersey, according to the National Weather Service.Washington, D.C., where President Donald Trump promises to deliver a "really long speech" on Saturday night, could see an all-time high temperature record broken. The current record of 100 degrees, set on July 4, 1919, could be broken as the temperature is forecast to reach 101 degrees, according to AccuWeather. The region faces "dangerously hot conditions" on July 4, the NWS said.Extreme heat warnings and heat advisories blanket the National Weather Service's July 4 map from the Northeast and Mid-Atlantic to the South, Midwest and north Texas. Heat index temperatures, which factor in how hot it feels with relative humidity, will range from 105-115 degrees across much of Mid-South, Southeast and Mid-Atlantic, according to the National Oceanic and Atmospheric Administration.Heat index values of 105 to 110 were expected in New Jersey and parts of New York including Manhattan, while heat indexes of up to 107 are forecast for northeast Kentucky, southeast Ohio, and much of West Virginia. In Kansas and Missouri, heat index values up to 104 and 105 were forecast for Kansas City and St. Louis.Other states with extreme heat warnings included Tennessee, Indiana and Kentucky, with extreme heat watches issued for southern California and southwest Arizona.What cities will be hottest on July Fourth?The hottest cities for the heat index on July 4 include Richmond, Virginia (a whopping 115), Washington, D.C. (110), Raleigh-Durham, North Carolina (110), Tallahassee, Florida (110), and Memphis, Tennessee (109).Want to know the potential heat index where you live? Use the Zip code search at Heat.gov. How to stay safe on hot July 4thOfficials warned about the potential hazards from the heat. Young children and infants are especially prone to heat-related illness and death, as their bodies are less able to adapt to heat than are adults, the NWS said. Don't leave children or pets unattended in vehicles.Others who could be more sensitive to extreme heat include pregnant women, people with chronic medical conditions and older adults, especially those who have pre-existing conditions, the NWS said.North Carolina Gov. Josh Stein referenced "dangerously high temperatures" forecast for the state and suggested residents stay hydrated, wear light, loose-fitting clothes and "take breaks in the shade or AC," he said in a post on X.Other tips to withstand the heat:Drink plenty of fluidsStay out of the sunStay in an air-conditioned roomCheck up on relatives and neighbors.Try to limit strenuous activities to early morning or evening.New Yorkers can go to a cooling center, if needed during the "dangerous heat wave," Mayor Zohran Mamdani said in a post on X.The City of Philadelphia Office of Emergency Management also warned residents about the heat and posted a link to cooling centers across the city.Air conditioning is important for staying cool, but New York Gov. Kathy Hochul asked residents in a post on X to take it easy on the state's electric grid, by setting air conditioners to between 75 and 78 degrees and "avoiding unnecessary appliance use."Contributing: Dinah Voyles Pulver, Doyle Rice and Joel ShannonMike Snider is a national trending news reporter for USA TODAY. You can follow him on Threads, Bluesky, X and email him at mikegsnider & @mikegsnider.bsky.social & @mikesnider & msnider@usatoday.com.