We have one more day of Heat Advisory-level warmth on Tuesday before a front starts to usher in changes later in the day in the way of showers and thunderstorms. First, though, we start the day in the upper 70s to around 80° in the morning before highs head back into the mid-90s in the afternoon. Mid-70s dewpoints will yield heat indices around 110° for at least a couple hours. From there, showers and thunderstorms should develop in the afternoon, with more widespread coverage arriving late afternoon and evening as the front gets closer. A few storms could be on the strong to severe side with damaging wind gusts the main concern. Otherwise, heavy rain and frequent lightning are the other main concerns.

After what ended up being quite a hot weekend, we have a day or two more of advisory-level heat (maybe even warning-level heat in a few spots) before a front moves into the area and brings some more unsettled weather for a few days.

82° heat index combining with 95° air temperature at Mt. Pleasant is sending the heat index there to 120°. https://w1.weather.gov/obhistory/KLRO.html

Heat index is up to 110° at the airport as of noon. Johns Island is taking the cake right now at 117°, while Mt. Plesaant is decidedly unpleasant at 113°. Excessive Heat Warning continues until 7PM.