CHARLESTON (AP) — The heat wave continues in eastern South Carolina as forecasters on Friday again posted heat advisories for the entire coast and the Pee Dee.


Forecasters predicted that temperatures would range from 95 to 100 degrees and the heat index – how hot it really feels – could reach 110 degrees.


They warned that such conditions could lead to heat-related illnesses, warning people to drink plenty of fluids, wear light clothing and stay out of the direct sun.


Officials at Grand Strand Medical Center tell The Sun News of Myrtle Beach that, because of the humidity, they have seen an increase in patients with respiratory complaints. About half a dozen patients were treated Thursday at Conway Medical Center for heat illnesses.


In Beaufort County, where a heat index chart has been distributed to school principals, it is now a rule that students must stay inside for recess, physical education or athletics if the heat index gets too high.


“That chart had just been discretionary in the past for school-day activities,” district spokesman Jim Foster told The Beaufort Gazette. But he said with the heat wave approaching district officials “decided to err on the side of caution and institute that as a rule.”


At Hilton Head Island Elementary School, principal Jill McAden said fifth-grade teachers incorporated the heat index chart into math and science lessons so students could understand why they couldn’t go outside.


“That way, the students don’t just hear, ‘It’s too hot outside,’ but they can see and understand why it’s not safe,” she said.


The heat wave is forecast to begin easing its grip this weekend. After another hot day with highs in the mid-90s on Saturday, the high in Charleston on Sunday is expected to be a relatively mild 90 degrees.