An early-summer heat wave is producing some of the hottest temperatures of the year so far across the Carolinas, increasing the risk of heat-related illnesses and prompting the issuance of heat alerts.
A stout upper-level ridge of high pressure is expected to continue dominating conditions across the Southeast through at least the first half of the weekend.
The weather pattern will allow temperatures to climb well into the 90s across much of the Carolinas, while humidity levels push heat index values into the triple digits.
In Columbia, temperatures are forecast to reach 99 degrees on Friday and 98 degrees on Saturday afternoon, making it one of the warmest locales.
The expected temperatures will come within about one degree of the daily record high of 100 degrees, which was set back in 1977.
While nearly all communities will fall short of setting new records, the combination of the heat and humidity is expected to create dangerous conditions for those spending extended time outdoors.
Heat index values, which account for both the air temperature and humidity, are expected to exceed 100 degrees across parts of the state on Friday and Saturday.
National Weather Service forecasters noted that early-season heat can be more dangerous than similar conditions later in the summer because many people have not yet become acclimated to warm temperatures.
The NWS has issued a Heat Advisory for portions of the Pee Dee through 8 p.m. Friday, where heat index values could reach as high as 106 degrees.
In the alerted areas, residents who must be outdoors are encouraged to move strenuous activities to the early morning or evening hours when temperatures are somewhat cooler.
Additionally, wearing lightweight, loose-fitting clothing and drinking plenty of water throughout the day can help lessen the impacts of the heat.
NOAA's HeatRisk index has placed much of South Carolina in its "major" heat risk category, which is a Level 3 out of 4 on its scale.
The designation indicates weather conditions could significantly impact those without effective air conditioning or adequate hydration.
The first signs of relief are expected to arrive late in the weekend and early next week as precipitation chances increase with an approaching frontal boundary.
