We’ll get back into a warming trend for the rest of the work week as the mid-level trough that’s been keeping us quite unsettled yields to a little more ridging over the next few days. This will, in turn, help suppress the more widespread shower and thunderstorm development we’ve seen to start the week. Expect scattered showers and thunderstorms primarily each afternoon as daytime heating and the seabreeze kick in. Heavy rain will be possible within the strongest storms, particularly on Wednesday as deep tropical moisture remains in place. We’ll see this deeper moisture shunted a little further south getting into Thursday and Friday, cutting the heavy rain threat a little bit more, but it’s summer — an isolated downpour or two just cannot be ruled out.
As mentioned earlier, temperatures are going to warm up, and we’ll be back into the low 90s by Thursday. Mix in some humidity and it’s going to feel like the low 100s, so make sure you’re getting enough water and shade if you’re outdoors in the peak of the afternoon.
The rest of the work week will feature generally isolated to scattered shower and thunderstorm coverage ahead of a cold front that will stall in the area for Friday into Saturday, bringing greater coverage of unsettled weather (and possibly a low risk of severe weather on Friday). Thereafter, said front introduces a good bit of uncertainty into the forecast.
A Bermuda high will stay in force for Wednesday into Thursday. This will generally keep onshore flow in place, allowing occasional showers and storms to stream into the area from the Atlantic particularly in the morning hours before the seabreeze focuses additional showers and storms inland during the afternoon. Reasonably good atmospheric moisture is in place, allowing a few showers or storms to perhaps generate some locally heavy rainfall, especially where outflow boundaries collide. Temperatures will generally run in the upper 80s away from the coast.
As we get into Friday, a cold front will approach from the northwest in association with a trough of low pressure aloft. This will focus more numerous showers and thunderstorms particularly as we get into the evening. Model soundings suggest some wind shear sufficient for organizing a strong to severe storm or two, so we’ll want to keep an eye on these details as they evolve. Additionally, the Gulf will be open for business with the trough helping to draw more moisture into the area (precipitable water values exceeding 2″ for the geeks out there), so areas of heavy rainfall will certainly be possible. Ahead of the front, temperatures will still flirt with 90° before showers and storms increase in coverage.
Forecast becomes more uncertain heading into the Fourth
The aforementioned cold front will stall out somewhere nearby on Saturday, and this is where a fair bit of forecast uncertainty begins to come into play. Depending on where the front sets up, we could have a warm and fairly dry Fourth, or we might keep some more humidity, showers, and thunderstorms in the forecast. Today’s global model runs were trending a little drier, but one should never put much faith in a stalling cold front in our neck of the woods in July. My advice right now: Stay tuned to forecast updates as the details flesh out a little more.
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A cold front will pass through the area and stall out to the southeast as high pressure wedges down a little bit from the north. This will generate a bit of onshore flow, keeping temperatures in the mid-80s through the end of the work week. This will also combine with enhanced astronomical tides thanks to Thursday’s full moon to cause some minor to moderate coastal flooding each evening through at least Friday.
Scattered showers and thunderstorms will be possible each day through Friday, with the best chances coming along with the inland-moving seabreeze especially Wednesday and Thursday afternoon. By Friday, we’ll see an increased chance of thunderstorms as high pressure to the northeast gives way, allowing a trough of low pressure offshore to migrate inland and provide a sharper focus for precipitation to form.
With such saturated ground from a pretty rainy June thus far, we’ll want to watch any areas of heavy rain that develop for an isolated flooding threat. This doubly goes for times of the evening high tides due to the aforementioned king tides. With that in mind, the good news is that it won’t rain all day, every day, and not everyone will see rain every day, either.
After another night of heavy rain and flooding (with some hail and wind damage mixed in), we thankfully get a few days to dry out as drier high pressure builds south across the area overnight Tuesday into Wednesday. Temperatures will run a degree or two either side of normal for the rest of the work week. Humidity will be rather low for this time of year, and so heat indices will not run too much warmer than the air temperature. Still, “normal” for mid-June means upper 80s to low 90s, so it won’t exactly be cool. But any time we can get a drier heat for a few days during a Charleston summer, we will take it.
More importantly, we will stay rain-free for several days. It’s hard to believe that we were talking about a developing drought just two weeks ago, but here we are after a couple extraordinarily soggy days being extremely pleased to see the rain take a quick break. We look to stay dry through Saturday before tropical moisture once again infiltrates the area beginning Sunday.
We’ve got one more day of thunderstorm chances this week before a cold front sweeps them out of here by Thursday, setting us up for a fine end to the work week and a nice weekend.
First, though, we need to handle Wednesday. Wednesday is going to be a tricky day in the forecast; scattered showers and thunderstorms certainly seem possible, but the overall coverage of storms is less certain. It appears that thunderstorm activity along the Gulf Coast will rob our area of moisture, which should keep coverage and intensity a tick lower than we’ve seen over the past couple days. Still, a strong to severe storm or two cannot be totally ruled out, either.
What is certain about Wednesday is that it’ll be another warm and muggy day. Temperatures will head into the mid-80s once again, with heat indices running around 90°.
The cold front swings through overnight Wednesday/early Thursday morning, and the airmass begins to change in response. We’ll see partly cloudy skies on Thursday with highs topping out in the low 80s with a little lower humidity. This airmass really begins to take hold later Thursday into Friday, when temperatures will start in the upper 50s and warm to comfortable temperatures in the upper 70s with lower humidity. This nice weather hangs around into the weekend, particularly on Saturday. Enjoy it — we don’t have too many more of these “cool” snaps left until later this year!
Wednesday promises one more day of above-normal temperatures before a cold front adjusts temperatures downward for the remainder of the week. We should see plenty of sunshine during the day, though clouds will be on the increase in the afternoon with even a stray shower possible in the evening. WIth gusty winds and low humidity, fire danger could be elevated tomorrow, so please don’t burn if you can help it.
Better rain chances arrive overnight into Thursday as the aforementioned cold front moves through the area. The most striking change will be to high temperatures; after several days in the 80s, we’ll top out in the mid-70s on Thursday and will run even a tad cooler on Friday under mostly cloudy skies.
Clouds will hang around on Friday into the weekend as the front stalls out to the south, with some differing solutions on whether and how much rain could re-enter the picture over the weekend as that front hangs out. Stay tuned to forecast updates as far as how the weekend ultimately plays out.
Chilly temperatures will define the next couple days as Arctic air continues to spill into the area. We’ll start Wednesday below freezing in most locations away from the immediate coast; despite full sunshine, temperatures will struggle to reach the low 50s. Another freezing cold night is ahead for Thursday, but the afternoon will be a little warmer as winds swing around to the south ahead of the next cold front. Cloud cover will increase and help keep us warmer for Friday morning, with lows in the mid-40s. By Friday afternoon, we’ll see highs return to the low 60s — and a pre-frontal band of showers will roll through the area as well.
The rest of the work week will be characterized by a bit of a warming trend. Expect high temperatures in the low 60s from Tuesday through the end of the week before a cold front backdoors into the area sometime Friday.
Mostly sunny skies will dominate Tuesday and Wednesday before the next storm system begins to affect the area Thursday with increasing clouds and a slight chance of a shower late. Scattered showers will remain in the forecast on Friday as the front sags southward across the area.
After Isaias, we find ourselves back in a wetter-than-normal summertime regime, with scattered thunderstorms possible each day as we remain under a trough of low pressure aloft. Plenty of atmospheric moisture will remain in place, allowing for heavy rain in any thunderstorms that develop. Be on the lookout for plentiful lightning, too, with the occasional storm turning severe with strong downburst winds.
Temperatures will remain generally around where they should be in early August: Upper 80s to low 90s. Mix in the humidity and heat indices in the 100s will be routine, with dangerous heat indices around 105° possible for Thursday and Friday.
After a seasonable, somewhat cloudy Presidents’ Day, we look toward an unsettled work week ahead, with shower chances each day and gradually cooling conditions. Tuesday will be the warmest of the two days as temperatures rise to the low 70s in the wake of a warm front. A cold front will then back-door into the area from the north on Wednesday, causing temperatures to plummet and winds to shift around to the northeast for Thursday. Finally, one more front swings through Thursday night into early Friday, scouring out the rain and leaving us quite chilly with highs perhaps not making it to 50°. (No, winter is not over yet.)
@chswx is community-supported, hype-averse weather information, preparedness tips, and alerts for the Charleston, SC Tri-County area (Berkeley, Charleston, Dorchester counties) by Jared Smith.