A heat wave advisory from the National Weather Service is in effect for 112 million United States citizens on Thursday as the Southwest faces an unprecedented heat wave with no end in sight.

The heat wave is expected to shatter current records in the Southwest, with Phoenix, Arizona, on track to break its 18-day record of temperatures above 110 degrees Fahrenheit. It reached Day 14 on Thursday. The advisory is in effect for nearly all of Arizona, California, Louisiana, Missouri, Nevada, Oklahoma, and Texas.

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"Unfortunately, the long term outlook for the region shows a continued heatwave through this weekend and into next week," the NWS said of the Southwest.

Phoenix could also see temperatures of nearly 120 degrees Fahrenheit over the weekend, the service warns. The city's record for the hottest day is 122 degrees Fahrenheit.

Las Vegas could also beat its record for the hottest day of 117 F, with the weather service currently predicting the city's temperature could rise to 118 F on Sunday. The weather service in Las Vegas warned that the high temperatures could be deadly, entering a period of "extreme" heat risk which is the highest warning it can issue.

Extreme heat is a quiet killer, often most deadly if there are prolonged periods of extreme heat. It is the most common weather-related cause of death in the country, according to the service.

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Death Valley in California, which is considered one of the hottest places on Earth, could also set a global heat record if it passes 130 F this weekend. It is currently expected to reach between 129 F and 132 F this weekend.

Florida is also seeing an unprecedented heat wave, with parts of the Gulf of Mexico reaching 97 F. Scientists have warned that the high ocean temperature could wreak havoc on the coral reefs in the area.