Charleston Weather Blog

Forecast explanations, atmospheric science, and other cool weather-related stuff for Charleston, SC

Friday & the weekend: Warm, muggy, stormy at times

/ June 27, 2024 at 11:12 PM

After some much-needed rainfall Thursday, we’ve got a few more shots at additional rain as we close out the month. In fact, the thunderstorm activity Thursday night will likely help keep temperatures and dewpoints down a little heading into Friday, with heat indices “only” in the low-to-mid-100s for many of us before thunderstorms fire in the afternoon. The early return from the late Thursday evening model runs suggests less storm coverage Friday than we saw Thursday, but some of us will still see another round of needed rain.

The active summertime pattern stays in place for Saturday into Sunday as well, with air temperatures in the low 90s combining with increasing dewpoints in the mid-to-upper 70s to prompt Heat Advisory-level conditions once again each afternoon before thunderstorms fire. Scattered coverage continues to be expected, with some of us getting luckier than others as far as rainfall goes. Some of the rain could be quite heavy at times, though, with minor flooding a possibility if it sets up in the more vulnerable locations. And as always, you can’t rule out a stronger or even marginally severe thunderstorm in the summertime; while there isn’t much to hang your hat on as far as organized storms, boundary and cell collisions can help bring down some strong wind gusts.

Thursday: Heat and humidity continues

/ June 26, 2024 at 10:32 PM

The meteorological status quo continues on Thursday: Heat, humidity, and a few storms in the afternoon. Temperatures will be fairly heinous on Thursday, with lows barely dipping below 80° away from the warmer coastline and highs getting into the mid-to-upper 90s in the afternoon. Mix in dewpoints in the mid-70s, and that’ll yield another day of dangerous heat indices in the 107-110° range. I’d be ready for yet another Heat Advisory to be issued for tomorrow.

A front sinking southward into the area combined with the usual seabreeze influence will help improve shower and thunderstorm chances for more of us tomorrow afternoon and evening. Pockets of heavy rain will be possible, and some gusty winds will be possible in any thunderstorm as well. A stray Severe Thunderstorm Warning certainly is in the cards, but widespread severe weather isn’t expected.

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Rest of the work week: Still hot, still humid, and occasionally stormy

/ June 25, 2024 at 9:31 PM

Heat and humidity continue for the rest of the week, with advisory-level heat indices remaining a distinct possibility, broken up only by isolated to scattered afternoon and early evening thunderstorms.

We’re back into the mid-90s Wednesday after a mid-70s start. Heat indices in the mid-100s will be common, with higher values possible closer to the coast where dewpoints will run a little higher. Don’t be surprised if another Heat Advisory comes out for Wednesday. A few of you could get lucky and get a thunderstorm to help cool things off, though the winds could be a bit strong at times in these. However, as is common with the summertime weather regime around here, widespread severe weather is not expected.

We’ll keep this going Thursday into Friday. Air temperatures peak on Thursday, topping out in the mid-to-upper 90s as winds go a little more westerly through about 5,000 feet. Once again, isolated to scattered showers and thunderstorms are possible in the afternoon as convective temperatures are reached and the seabreeze makes a slow push inland. Expect similar conditions Friday, with highs once again topping out in the mid-90s after an upper 70s start, with just a few showers and thunderstorms perhaps imparting relief.