PHOTOS: Heat wave hits US

High temperatures are expected to scorch the major cities of the East Coast and Midwest. More than 85% of the lower 48 states will see temperatures over 90 this weekend.

Boston, Pittsburgh, New York, Baltimore and Washington are under excessive heat watches. Philadelphia is under an excessive heat warning, and in the southern end of the coast, Raleigh is under a heat advisory.

In the Midwest, cities all over the region — such as Cleveland, Minneapolis, Chicago, Omaha and Detroit — face heat warnings or advisories, Detroit officials are urging residents to drink plenty of water, reduce outdoor activities, eat light and check on family and neighbors.

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Russ Wilson splashes water on his face from a fountain in New York, Wednesday, July 17, 2019. The heat wave that has been roasting much of the U.S. in recent days is just getting warmed up, with temperatures expected to soar to dangerous levels through the weekend. (AP/Seth Wenig)

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A roofer pauses to wipe his face as he works on a new home under construction Thursday, July 18, 2019, in Houston. A heat wave is expected to send temperatures soaring close to 100 degrees through the weekend across much of the country. The National Weather Service estimates that more than 100 heat records will fall on Saturday. Most will not be the scorching daily highs, but for lack of cooling at night, something called nighttime lows. Those lows will be record highs. (AP/David J. Phillip)

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Beating the heat, a tuber floats the cool Comal River, Thursday, July 18, 2019, in New Braunfels, Texas. (AP/Eric Gay)

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Beating the heat, tubers float the Guadalupe River, Thursday, July 18, 2019, in New Braunfels, Texas. (AP/Eric Gay)

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Beating the heat, a group sits in the Guadalupe River, Thursday, July 18, 2019, in New Braunfels, Texas. (AP/Eric Gay)

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Kayakers paddle in a canal leading to the Detroit River in Detroit Thursday, July 18, 2019. Heat and humidity are expected to mount to dangerous levels as part of a wave of sweltering weather covering a substantial portion of the U.S. (AP/Paul Sancya)

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Reona Dee Pearson visits with her dogs in a kennel at the Homeless Alliance day shelter Thursday, July 18, 2019, in Oklahoma City. The Homeless Alliance offers a kennel, complete with pet food and access to veterinary services, so that people with pets aren’t shut out of the system of care. Meanwhile, she can go inside for breakfast and lunch in air conditioning, showers, and access to computers and phones. (AP/Sue Ogrocki)

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People watch television at the Homeless Alliance day shelter Thursday, July 18, 2019, in Oklahoma City. The air-conditioned day shelter, open from 6 a.m. to 4 p.m., offers breakfast and lunch, provides showers, offers access to computers, phone, and mail, and provides access to mental and physical healthcare, budgeting assistance and legal support. The National Weather Service has issued excessive heat warnings from the Southern Plains to Nebraska and as far east to New York State and parts of the East Coast. (AP/Sue Ogrocki)

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An ostrich cools off in a shower of water at the Oklahoma City Zoo ,Thursday, July 18, 2019, in Oklahoma City. The National Weather Service has issued excessive heat warnings from the Southern Plains to Nebraska and as far east to New York State and parts of the East Coast. (AP/Sue Ogrocki)

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A Galapagos tortoise cools off in a shower of water from a zookeeper at the Oklahoma City Zoo, Thursday, July 18, 2019, in Oklahoma City. The National Weather Service has issued excessive heat warnings from the Southern Plains to Nebraska and as far east to New York State and parts of the East Coast. (AP/Sue Ogrocki)

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A gorilla reaches for a frozen treat at the Oklahoma City Zoo Thursday, July 18, 2019, in Oklahoma City. The National Weather Service has issued excessive heat warnings from the Southern Plains to Nebraska and as far east to New York State and parts of the East Coast. (AP/Sue Ogrocki)

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Kids play in a fountain to cool off as temperatures approach 100 degrees Thursday, July 18, 2019, in Kansas City, Mo. The heat wave that has been roasting much of the U.S. in recent days is just getting warmed up, with temperatures expected to soar to dangerous levels through the weekend. (AP/Charlie Riedel)