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Charleston Weather Blog

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

Rest of the work week: Hot, humid, scattered storms

/ August 5, 2020 at 8:11 AM

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.

Isaias departs, and a normal August pattern resumes

/ August 4, 2020 at 7:37 AM

Much quieter weather today as Isaias has long since departed the Charleston area. Temperatures top out in the low 90s, but the humidity will feel closer to the low 100s. There is a slight chance of an isolated PM shower or thunderstorm on the seabreeze as it advances inland this afternoon. A trough of low pressure aloft will keep things a little stormy each afternoon as we go into the rest of the week.

Isaias @ 11am: Tropical storm force wind probabilities increase

/ August 3, 2020 at 1:32 PM

The 11am advisory from the National Hurricane Center tweaked the forecast track for Isaias a little westward and faster. Maximum sustained winds remained around 70 MPH despite some signs of dry air intrusion. It is forecast to make landfall as a Category 1 hurricane somewhere around Georgetown or the Grand Strand.

The westward shift has some small implications for wind and tide forecasts for this evening. Overall expectations for impacts remain on track, though.

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What to expect from Isaias today

/ at 8:53 AM

Well, Isaias is here and is already raining on us a little bit; I’ve already picked up .72″ from the first round of rain this morning. There’s more where this comes from as Isaias makes its closest pass to Charleston tonight on its way to an expected landfall somewhere between Myrtle Beach and Wilmington.

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Isaias: Tropical storm warning, storm surge watch, flash flood watch in effect

/ August 2, 2020 at 8:52 AM

Impacts from Tropical Storm Isaias are becoming more likely in the Charleston metro area starting tomorrow morning, and additional watches and warnings are now in effect.

Early this morning, the National Hurricane Center upgraded the Tropical Storm Watch to a Tropical Storm Warning across the Tri-County area. A Storm Surge Watch is now in effect for coastal Charleston County, as well. The National Weather Service in Charleston hoisted a Flash Flood Watch for the Tri-County, which goes into effect tomorrow at 8am.

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Isaias: Tropical storm watch in effect for Charleston

/ August 1, 2020 at 5:58 PM

As of 5 PM, a Tropical Storm Watch is now in effect for the Charleston Tri-County area. This means that tropical storm conditions — winds 39-73 MPH, heavy, flooding rainfall, storm surge, and isolated tornadoes — will be possible within the watch area within the next 48 hours. This is your signal that preparation should be underway for the potential for wind damage, power outages, and flooding from Isaias as we head into Monday and Monday night.

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Isaias: Wobble wobble wobble

/ at 9:19 AM

At 8am, Isaias — not the most picturesque hurricane one has ever seen, but a hurricane nonetheless — was making its move on Andros Island in the Bahamas. The storm has been struggling with westerly shear and dry air intrusion, which will keep its intensity capped for now. Today is a pivotal day in the evolution of the storm’s track for the next few days, and we’ll all want to keep an eye on it as we begin to prepare for its arrival Monday.

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Isaias is a hurricane; track forecast largely unchanged

/ July 31, 2020 at 9:17 AM

It’s not the most picturesque hurricane on record, but it will do: Hurricane Isaias, which was upgraded after Hurricane Hunters found winds near 80 MPH last night, is now churning through the Bahamas this morning. Isaias remains a Category 1 storm as of this morning with 80 MPH winds, and is moving NW at 17 MPH. It is expected to strengthen to a Category 2 storm with max winds of 100 MPH before weakening as it curves up the US coast this weekend.

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[UPDATED] Tropical update: Isaias could play a role in our weather early next week

/ July 30, 2020 at 10:18 PM

Tropical Storm Isaias was named with the 11PM advisory last night, and it has brought flooding rain to Puerto Rico over the last couple days as it moved nearby and through Hispaniola. This evening, the center of the storm is reforming on the north side of Hispaniola. There was some speculation that the mountainous terrain of the island would potentially seriously disrupt the storm, but this appears to be a case where that didn’t happen. At 8PM this evening, the storm maintained 60 MPH max sustained winds with the minimum central pressure down to 999 millibars.

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Tropical update: Watching Potential Tropical Cyclone Nine

/ July 29, 2020 at 8:29 AM

Potential Tropical Cyclone Nine — which may become Tropical Storm Isaias later today — continues to churn into the Caribbean this morning. Its satellite presentation has improved over the last couple days, and is beginning to show signs that it might be finally getting its act together enough to become a tropical cyclone. It’s bringing heavy rain to the Leeward Islands and will spread its effects into Puerto Rico later today.

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