Published: June 18, 2026 at 3:49 AM Sign up for our Newsletters Published: June 18, 2026 at 3:49 AM A Heat Advisory goes into effect at 11 AM Thursday and runs through Friday evening, so the dangerous heat is the big story. After some morning clouds left over from Tropical Storm Arthur, skies will clear and temperatures will climb into the mid-90s. But the real concern is the heat index, with dewpoints surging into the upper 70s, it will feel like 108 to 110° during the afternoon hours.