South Carolina is one of many states being impacted by a strong ridge of high pressure, which will send temperatures climbing toward the triple digits this weekend and early next week.
Forecast models show many neighborhoods reaching the mid-90s on Saturday, with upper 90s expected on Sunday as the ridge strengthens across the region.
But the air temperature is only part of the story. Once humidity is factored in, heat index values are expected to climb between 104 and 109 degrees, especially across the Midlands, Lowcountry and coastal region.
In the warmer locales, the feels-like temperature will be in the dangerous range, where prolonged time outdoors can increase the risk of heat-related illnesses.
The seasonal heat has already turned deadly, with a 68-year-old man dying from heat-related complications outside of Charleston in Berkeley County, according to local authorities.
The combination of extreme heat and high humidity can place additional stress on the body because it becomes more difficult for sweat to evaporate and cool the skin.
Additionally, a lack of clouds and rainfall will allow more direct sunshine to reach the surface and make the conditions more unbearable.
The weather pattern is typical when strong areas of high pressure become entrenched over the country and can lead to everything from heat alerts to air quality advisories being issued.
Widespread heat waves are also known to put additional strains on the power grid as demand increases for air conditioning from residents and businesses.
Earlier in the month, the U.S. Department of Energy issued an emergency order at the request of Duke Energy to waive limitations on power generation.
No power disruptions were reported with the earlier event across the Carolinas, but with temperatures now expected to be warmer across a larger region, the possibility of increased stress on the electrical grid remains.
Air temperatures are expected to stay well below record levels but that does not mean there aren't precautions residents can take to avoid problems from the heat.
National Weather Service forecasters always encourage residents to limit outdoor activities during the hottest parts of the day, drink plenty of water and wear light-colored clothing.
Since the Palmetto State will not be directly under the center of the ridge of high pressure, there will likely be a few brief breaks during the next two weeks, but temperatures will remain well above normal.
Forecast models show the roller-coaster-like pattern continuing through at least the Independence Day week.
