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.
Ready for a break in the humidity? If so — as I suspect most of you are — it begins on Tuesday as drier air filters into the area throughout the day. We’ll see dewpoints fall from the low 70s to start the day to the mid-60s by sundown. High temperatures will still top out in the upper 80s, and it’ll still feel a little more like 90-91°, but overall, it’ll start to feel a lot better. There’s a small chance for a few showers to fire near the coast in the late afternoon, but the vast majority of us look to stay rain-free under partly cloudy skies.
It gets better from here, too: Wednesday morning will feel positively refreshing with dewpoints in the low 60s and air temperatures in the mid-60s away from the coast. It’ll also be the first day with zeroed-out rain chances all month. Should be an excellent day for an outdoor lunch or an evening walk. (Why not both?)
Rain chances within onshore flow creep up a bit starting Thursday as a coastal trough forms, but temperatures will remain a little more seasonable — not quite fall, but not quite blazing summer, either, as highs top out in the low 80s after morning lows in the upper 60s.
We’ll get a chance to dry out a little bit this week as a front swings through, ushering in some cooler and drier air around midweek. Rain chances don’t totally evaporate, though, and we’ll keep the risk for isolated to scattered storms especially as we approach the weekend. (At least it will feel quite a bit better than it has over the past few days!)
Monday will mark one more day with the unseasonably moist airmass that’s been torturing us for much of recent memory blanketing the area. There will be a slight chance for some morning rain, but much of that should be out of here by sunrise. We’ll wake up to lows in the mid-70s (higher near the coast and downtown) before highs reach the upper 80s under partly cloudy skies. A scattering of showers and thunderstorms will fire off in the afternoon and evening hours. Not everyone gets wet, but some heavy rain will be possible in the strongest storms.
Changes begin to arrive Tuesday as the front moves into the area. We should still see a fairly warm afternoon — highs mid-to-upper 80s are expected — but storm coverage should be a bit more sparse as some drier air begins to work into the area. The front gets through overnight Tuesday and we’ll start Wednesday perhaps in the upper 60s in some spots away from the coast. (Baby steps.) There will be a slight chance of showers coming ashore in the afternoon, but overall expect a partly cloudy day with less humidity than we’ve seen over the past few weeks.
High pressure wedging into the area will keep highs suppressed to the mid-80s Thursday and the low 80s for Friday and the weekend. There will be a chance for showers and maybe a thunderstorm depending on the track of a low that develops along the front, but certainly nothing like the sog-fest that we’ve seen lately.
Expect another round of scattered showers and thunderstorms for Sunday as moisture continues to pump into the area from the Gulf and beyond. We may see some pre-sunrise showers and storms in the area to start the day, but the greater probability of precipitation will arrive in the afternoon as the seabreeze begins trekking inland and thunderstorms get rolling. Heavy rain and lightning will be the main concerns for any thunderstorm that develops. Once again, don’t expect it to rain all day at any one location — just be ready to move outdoor activities inside if thunderstorms approach.
Given the scattered cloud cover, expect temperatures to head into the upper 80s in the afternoon. Mix in the humidity, though, and it’ll feel closer to 100-102°. Given just how much rain has fallen in the last few days, too, grassy areas without much tree cover may be especially heinous.
Elevated rain chances continue for Monday, but we will start to see a bit calmer weather Tuesday and especially Wednesday before a front stalls out nearby Thursday, which will bring some scattered rain chances back into the picture — though right now, it looks nothing like we’ve been experiencing recently.
The weather pattern remains fairly active heading into the weekend, and there will be a continued risk for tidal flooding around times of high tide. It won’t rain all the time, though.
We enter Saturday with a front draped near the coast. This front will begin to lift northward during the day; this will focus the potential for heavier rain a little more inland than we’ve seen the past couple days. We may have a few showers around in the morning, but expect more robust showers and thunderstorms to initiate in the vicinity of the front by mid-afternoon. As mentioned, these will be on and off storms, and it won’t rain all day. Be flexible with outdoor plans and be ready to head inside at a moment’s notice in case storms threaten. Temperatures will head into the mid-80s ahead of showers and storms as we get on the warmer side of the front.
We’ll start to see some changes in the upper-air configuration on Sunday as the cutoff low starts to open up and lift out as a trough comes out of the central US. The moisture tap will remain wide open, and with the additional energy from the trough, we should see on and off showers and thunderstorms particularly in the afternoon and evening hours. Heavy rain remains a chief concern as precipitable water values range from 2-2.2″. Temperatures will run in the mid-80s once again ahead of any showers and storms.
We will still be contending with the risk for tidal flooding around times of high tide. Minor flooding will be possible Saturday morning around 7-11am, while moderate flooding will become a possibility Saturday evening around 7-11pm. Another couple rounds of minor flooding will be possible again with Sunday’s high tides, though we’ll see less severity with those overall as winds start to lose some of that more easterly onshore component.
We transition back to a more active pattern beginning Thursday as a front gets through and stalls out nearby while the upper-air configuration aims a steady stream of moisture and disturbances at us for a few days. While it looks like we start the day mostly dry, expect showers and storms to develop in the afternoon and evening hours. Rain will be locally heavy at times, with the potential for isolated bouts of freshwater flooding. The increase in cloud cover and shower activity will help limit highs to the mid-80s, some 10° cooler than we’ve experienced the past couple days.
Tides will begin running well into flood stage in Charleston Harbor around the evening high tides beginning Thursday. Minor to moderate flooding is forecast Thursday evening around the 7:22 PM high tide, and this should be enough to close a few roads downtown regardless of any rain. If it rains heavily, of course, this will certainly lead to a more widespread flooding event, so we’ll be watching downtown closely on Thursday and over the next few evenings in general.
Rain chances continue to head up Friday into the weekend as precipitable water values surge well past 2″. The risk for flooding will increase accordingly across the area, and mixing in the higher tides, we could be in for a busy few days downtown. Stay tuned to forecast updates as we close out the work week and head into the weekend.
We will get one more day of relatively sparse thunderstorm coverage on Wednesday before the pattern becomes more active again starting Thursday. Highs will once again head into the low 90s across much of the area, and a few mid-90s readings can’t be ruled out either. 90s should reach all the way into downtown once again, too, as westerly winds pin the seabreeze to the immediate coast. As mentioned, a shower or storm can’t be ruled out in the afternoon and evening hours, with the best rain chances inland near an advancing cold front.
On Thursday, a strong influx of Gulf moisture opens up across the area. This, combined with the aforementioned front coming through and subsequently stalling out, will keep us quite unsettled as we head into the weekend. Temperatures will be modulated back to the mid-80s as numerous showers and thunderstorms should develop by afternoon. Friday remains unsettled as well, and some guidance suggests that could be a particularly rainy day, perhaps suppressing highs to the low 80s at best.
We will need to keep an eye on Thursday and Friday evening’s high tides for the potential for salt water flooding, too. Onshore flow combined with the upcoming full moon should drive water levels over 7′ each evening. These tides combined with the potential for heavy rain could spell another round or two of trouble for downtown Charleston — certainly something that will be watched quite carefully over the next few days. Stay tuned for forecast updates as rain timings and amounts become a little clearer as we get those soggier days into range of the higher-resolution model suite.
We’ll get a break in the more widespread rain as we head back to work and school on Tuesday as the surface configuration briefly turns a little more summer-like. We won’t stay completely rain-free — isolated to widely scattered showers and thunderstorms will be possible in the afternoon — but it certainly will be a bit of a shift from where we’ve been. The lower shower and storm coverage means temperatures will head to the low 90s in the afternoon; mix in the humidity and it’ll feel closer to 101-102°. We’ll repeat this on Wednesday before another front moves into the area by Thursday. Said front will once again stall out nearby — just not enough oomph yet to get these through at this point in the season — and keep us very unsettled from Thursday through Friday and into the weekend. This will send temperatures down to the upper 80s on Thursday to the low 80s on Friday with numerous showers and thunderstorms expected each afternoon. Heavy rain will be possible, and we may not get out of this week without another bout with flooding somewhere in the metro. Stay tuned to forecast updates.
Labor Day looks to feature an uptick in shower and storm coverage when compared to Sunday’s relatively quiet weather, but it still doesn’t look like a situation where outdoor plans will be totally washed out. After a little drier air worked its way into the area for Sunday, more moisture will move back in from the southwest for Monday. We could start the day with some showers and storms advancing northeastward across the area with some brief downpours embedded. Then, the seabreeze should kick in during the afternoon and help develop more showers and thunderstorms, which will progress inland with time. Heavy rain is the main concern from any thunderstorms; with precipitable water values over 2″, there will be a risk for flooding in a few spots where heavy rain repeats on itself. Of course, lightning will be a concern as well — as always, remember that if you’re hearing thunder, you’re in the strike zone. When thunder roars, go indoors!
Like the last few mornings, we’ll start in the low-to-mid 70s (warmer near the coast) and head toward the mid-80s in the afternoon outside of any showers and thunderstorms that develop. Mix in the humidity and it’ll feel closer to some very muggy mid-90s.
Bottom line: It won’t rain all day, but you’ll want to keep an eye to the sky in case conditions begin to head downhill. Be flexible with your outdoor plans and have a solid plan B in your back pocket.
Sunday’s forecast is essentially a matter of highlighting today’s weather, hitting Cmd+C, then Cmd+V (or Ctrl if you’re on Windows or Linux). Onshore flow will continue with the risk for scattered showers and storms throughout the day. Better rain chances will be found at the coast in the morning before transitioning inland with the seabreeze in the afternoon. Precipitable water values will remain at or above 2″, which will promote the risk for isolated downpours and perhaps flooding concerns if heavy rain ends up repeating over the same area. The diffuse stationary front which has been plaguing our surface pattern for the better part of a week now will wobble a little further southwest for Sunday, which should keep the more widespread rainfall in Georgia. Even still, though, stay flexible with your outdoor plans and be ready to move them inside quickly if storms approach.
Temperatures will once again follow today’s trend: lows in the low-to-mid-70s to start the day, with highs topping out in the mid-to-upper 80s before showers and thunderstorms set in. Heat indices will run in the mid-90s with the continued summer-esque humidity in place.
This pattern looks to continue into Labor Day and beyond. Aloft, ridging remains firmly in place over the next several days as an upper low cuts off over the Midwest. In the tropics, Tropical Storm Earl, which was named last night, will recurve well away from the US before it becomes a threat to land, while Danielle remains very far out in the Atlantic, an issue for shipping traffic and fish.