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Author: Jared Smith

Jared Smith founded @chswx on Twitter in 2008 as an experiment in disseminating weather data through social media. In the ensuing decade-and-a-half, @chswx has provided live coverage of tropical cyclones, tornadoes, severe weather, and even a couple bouts of winter weather to the good people of Charleston, SC.

Friday & the weekend: Humidity takes a brief break

/ September 14, 2023 at 8:48 PM

We get a break in the humidity Friday and Saturday as cooler and drier high pressure builds in from the northwest. Temperatures get off to a nice start on Friday, and persistent northeasterly winds will keep highs capped in the mid-80s as cloud cover decreases. Dewpoints, meanwhile, will plummet into the mid-50s, and this will allow relative humidity values to drop below 40%, making for rather comfortable warmth.

Saturday is probably the best day of the set to get outside, as we start the day in the low 60s before heading back to the mid-80s in the afternoon under mostly sunny skies. Dewpoints will again mix out into the mid-50s during the day, and we’ll have another round of sub-40% humidity.

High pressure slips offshore overnight Saturday, and by Sunday dewpoints will be rebounding back into the mid-to-upper 60s. Another front will be approaching the area during the day, and this will be the impetus for showers and thunderstorms as we get later into Sunday and Sunday evening. Highs top out in the mid-80s. Overall, expect temperatures to remain at or a little below normal as we head into next week.

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Thursday: One more unsettled day, then a couple really nice days

/ September 13, 2023 at 10:46 PM

A cold front will slip offshore early Thursday morning, but we won’t quite be feeling it just yet as some showers and thunderstorms will still be possible as moisture lingers across the area during the day Thursday. Highs top out once again in the upper 80s before showers and a few storms fire. Instability isn’t great and severe weather is not expected, though some heavy rain will yet be possible at times. The best chance to see a shower or storm looks to be in the afternoon and early evening hours.

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Rest of the work week: Front comes through Wednesday to bring great weather for the weekend

/ September 12, 2023 at 8:20 PM

Shower and thunderstorm chances — as well as temperatures — peak on Wednesday ahead of a cold front approaching the area. We’ll start the day in the low 70s with highs heading into the upper 80s in the afternoon before thunderstorms erupt generally along the seabreeze. A few thunderstorms could produce some strong wind gusts, with heavy rain and frequent lightning the more widespread concerns. The front should stall out to our west for the balance of the day before making its move through the area overnight Wednesday.

The airmass change behind the front will be somewhat slow at first. We’ll certainly see slightly lower dewpoints Thursday with air temperatures topping out a few degrees cooler as well, generally in the mid-80s. However, there should be enough low-level moisture to allow for a few popup showers and storms in the afternoon, so be ready for the potential to dodge a storm or two.

The airmass change picks up steam later Thursday into Friday, which looks positively brilliant. Expect lows in the mid-60s Friday to be followed by highs in the low 80s in the afternoon under nearly unfettered sunshine. Dewpoints will fall into the low-to-mid-50s during the day, providing a comfortably warm feel to the air. We’ll keep this going into the weekend, too, with lows bottoming out near 60° on Saturday. (Might even record a few upper 50s in some spots!) Fall is indeed coming, but these transitional seasons can be a little frustrating at times as the weather see-saws back and forth. (Hence “transitional season.”

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Tuesday’s forecast: Warm, a bit muggy, afternoon storms

/ September 11, 2023 at 9:50 PM

Tuesday’s forecast will once again feature a seasonably warm and humid airmass that’ll give rise to some showers and thunderstorms in the afternoon, generally along and ahead of the seabreeze. We start the day in the low-to-mid-70s. Some fog may be around as we start the day, so be ready for possible visibility reductions particularly as you get further inland. Highs top out around 90° in the afternoon before a few storms fire, which will cool things off for some of us. A couple strong storms are possible, but don’t expect a widespread severe weather issue.

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The week ahead: Hot start, but another taste of fall is inbound

/ September 10, 2023 at 11:07 PM

We will get off to a warm start for the first part of the work week, but a front will bring another taste of fall for the second half into the weekend.

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Sunday: A few scattered storms, but not a rainout

/ September 9, 2023 at 8:37 PM

Sunday should have a similar flair to Saturday with scattered storms and sunshine mixing in afterward. Like Saturday, we could see a few storms possible in the morning before gradually pushing inland during the day. And like Saturday, we should also see some decent sunshine kick in as well, with highs approaching 90° in the afternoon. Overall, not expecting a full rainout anywhere, but a few spots could see some heavy downpours with a quick inch of rain or so possible (much like parts of West Ashley and North Charleston saw this morning!)

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Weekend forecast: Stormy at times, particularly Saturday

/ September 8, 2023 at 8:30 PM

Showers and thunderstorms will be off and on throughout the weekend, particularly Saturday as a disturbance aloft ripples through the area. Winds turning onshore will bring some more moist air into the area, and we could see showers and thunderstorms begin to affect the area by daybreak. Some spots could see some fairly heavy rain at times, and a strong or severe storm isn’t totally out of the realm of possibility (though is rather unlikely). It won’t rain all day, but be ready to enact indoor plans on Saturday if necessary. Highs top out in the mid-to-upper 80s given the cloud cover and rain expected.

Storms should be a little more sparse coverage-wise throughout the day Sunday, though most of us should see at least some rainfall at some point throughout the day. Much like Saturday, the rain risk looks to start at the coast in the morning hours before shifting inland with the seabreeze in the afternoon. Once again, a storm or two could be strong, and some of the rain could be heavy at times, but widespread severe weather just doesn’t seem to be in the equation. Highs on Sunday run a click warmer, but still generally in the upper 80s.

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Friday & the weekend: Storms are back, peaking Saturday

/ September 7, 2023 at 6:39 PM

A stalling cold front and a cutoff low aloft will combine to bring shower and storm chances back to the area starting Friday afternoon, peaking on Saturday, and then gradually tapering on Sunday. Highs on Friday top out in the low 90s, with the best chance for showers and thunderstorms generally being found along and ahead of the seabreeze. With the upper low drifting across the area Saturday, showers and thunderstorms could fire at any point, with some guidance hinting at Saturday getting off to a bit of a soggy start as showers and thunderstorms drift inland. Highs on Saturday top out in the mid-to-upper 80s given the rain and cloud cover. We’ll see the upper low lift out of the area on Sunday, decreasing the risk of showers and storms somewhat, but coverage should still be decent given the nearby front.

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Record-tying heat possible Thursday before storms return for the weekend

/ September 6, 2023 at 7:31 PM

We have one more rain-free and rather warm day coming up on Thursday. Expect highs to once again top out in the mid-90s under partly cloudy skies, with some humidity mixing in to drive heat indices to the upper 90s to around 100°. It’s worth noting that the NWS forecast high of 95°, if it did indeed come to pass, would tie the daily high temperature record set in 1941 and then tied in 1947 and 2019. (For reference, last year’s high on September 7 topped out a degree shy of the record.) Ridging will weaken throughout the day, but much of us should expect to get the day in rain-free. I don’t know that I’d totally rule out a shower or storm closer to I-95, though.

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Rest of the work week: Heat’s back; a storm or two Friday

/ September 5, 2023 at 9:02 PM

The forecast for the rest of the work week is generally on track: Temperatures in the mid-90s will continue through Thursday with peak heat indices around 100° thanks to some, but not too much, humidity. Skies will generally run partly cloudy to mostly sunny. Storm chances don’t return to the picture until Friday, and even then, it looks like coverage will be more on the isolated side. The weaker ridge will keep temperatures running a little lower (low 90s) on Friday, but above-normal temperatures look to continue heading into the weekend despite steadily increasing storm chances as a front arrives and stalls out nearby. (Remember, normal is looking a little lower these days: normal highs for this week generally run around 87°.)

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