Category: Weather

Weather Alert: Potential Weekend Rainfall and Localized Flooding

Moisture associated with Hurricane Isaias is expected to spread across South Carolina, increasing rain chances late tonight and throughout much of the weekend.

Saturday could bring locally heavy rainfall, breezy winds, and flash flooding in some areas. Isolated tornadoes are also possible. 

Saturday’s New Moon will create King Tides at our coastline. Moderate-to-major tidal flooding may occur on Saturday.

If you are not signed up for Everbridge, you can do so by clicking here. If you are signed up to get phone call notifications, Everbridge will now call from this number: (843) 994-3547. Everbridge will send any National Weather Alerts for Seabrook Island throughout the weekend.

– Submitted by the Town of Seabrook Island

King Tides in the Charleston Area October 10-11 & 26-29

King Tide is a common term for high tides that are higher than normal. They usually occur during a full or new moon or during specific seasons throughout the year. Charleston’s average high tide range is about 5.5 ft., but during a king tide event, it can reach 7 ft. or higher.

King Tides can cause flooding in low-lying areas, resulting in road closures on Seabrook Island, as well as the Johns Island and Charleston areas. This is particularly true when a king tide coincides with significant rain and/or wind.

There are two King Tides in October because the lunar cycle, which takes about 29.5 days to complete a full and new moon phase, aligns twice this month.

The next dates of the predicted King Tides are October 10-11 and 26-29.

Continue reading “King Tides in the Charleston Area October 10-11 & 26-29”

King Tides in the Charleston Area September 29-30

King Tide is a commonly used term describing high tides that are higher than normal. They usually occur during a full or new moon or during specific seasons throughout the year. Charleston’s average high tide range is about 5.5 ft., but during a king tide event, it can reach 7 ft. or higher. 

King Tides can cause flooding in low-lying areas, resulting in road closures on Seabrook Island, as well as the Johns Island and Charleston areas. This is particularly true when a king tide coincides with significant rain and/or wind.

The next dates of the predicted King Tides are September 29-30.

Continue reading “King Tides in the Charleston Area September 29-30”

Coastal Flood Advisory

The Town of Seabrook Island reports that the National Weather Service has issued Coastal Flood Advisory for our area. There is also a high risk for dangerous rip currents.

Click here for more information on this alert.

A coastal flood advisory means minor nuisance flooding is happening or coming soon, while a watch means moderate to major flooding is possible, and a warning means moderate to major flooding is happening or imminent

–Tidelines Editors

Sand Scraping Project Presentation

On Monday, September 14, Steve Hirsch of SIPOA and Patrick Barrineau of Coastal Science & Engineering presented details about the planned sand scraping project at a Get the Scoop meeting.

If you missed the presentation, you can view it by clicking here. You can also view the presentation at sipoa.org by clicking Activities and Events, then Get the Scoop presentations.

Below is a copy of one of the slides outlining some of the project details that are helpful to know.

–Tidelines Editors

Hurricane Season Peaks September 10

This summer has been eerily quiet on the tropical weather front for us in the Lowcountry. Remember, things can change quickly.

Roughly 90% of all Atlantic tropical weather typically occurs in August, September, and early October. Hurricane season peaks on September 10. The majority of the biggest storms have appeared within a week or two of September 10.

Now is the time to complete your hurricane preparations. Tidelines began publishing our Hurricane Hints series back in 2017. You can find our Hurricane Hints anytime on the Tidelines website. Use the Hurricane Hints dropdown menu.

Remember, be prepared; stay safe.

–Tidelines Editors

Extreme Heat Throughout the Weekend

Charleston County is forecast to experience potentially record-breaking heat indices, with some of the highest values across the Southeast.

While Coastal South Carolina is currently under an Extreme Heat Warning, an Extreme Heat Watch is expected for Saturday from 11:00 am to 8:00 pm, with heat index values potentially reaching 117°F.

This is more than just a hot summer day. These conditions can become life-threatening, particularly with prolonged exposure or strenuous outdoor activity.

During this period of extreme heat, please encourage personnel and the public to:

  • Drink plenty of water and electrolyte-containing fluids.
  • Limit time outdoors, particularly in direct sunlight.
  • Reduce or reschedule strenuous outdoor activities when possible.
  • Wear lightweight, loose-fitting, moisture-wicking clothing.
  • Check on individuals who may be especially vulnerable to extreme heat.

If someone shows signs of a heat-related emergency, call 911 immediately, move them to a cooler location, and begin cooling measures while awaiting emergency responders. 

– Submitted by the Town of Seabrook Island

SIPOA Infrastructure Master Plan

Community Education – SIPOA Infrastructure

SIPOA maintains a wide range of infrastructure on the island, including stormwater, roads, beaches, and lakes. In an effort to help educate residents on how SIPOA manages this infrastructure, we have created an Infrastructure Master Plan. This page serves as a dashboard that outlines SIPOA’s infrastructure management practices. Each month, we will highlight a different piece of the Infrastructure Master Plan.

STORMWATER OUTFALLS

A stormwater outfall is the point where stormwater leaves a stormwater pipe and enters the downstream marsh.

The marsh is always changing, and the path the stormwater takes from the pipe to the tidal channel must be maintained as part of the stormwater infrastructure.

This summer, the engineering interns completed an in-depth survey and condition assessment of all 64 stormwater outfalls on Seabrook Island. The results of this study are presented in one of our newest pieces, the Stormwater Outfall Management Program. This program outlines past, present, and future outfall maintenance practices.

We hope that this tool helps residents understand more about this piece of SIPOA’s infrastructure.

-Submitted by SIPOA

(Image credit: SIPOA)

King Tides in the Charleston Area August 11-12

King Tide is a commonly used term describing high tides that are higher than normal. They usually occur during a full or new moon or during specific seasons throughout the year. Charleston’s average high tide range is about 5.5 ft., but during a king tide event, it can reach 7 ft. or higher. 

King Tides can cause flooding in low-lying areas, resulting in road closures on Seabrook Island, as well as the Johns Island and Charleston areas. This is particularly true when a king tide coincides with significant rain and/or wind.

The next dates of the predicted King Tides are August 11-12.

Continue reading “King Tides in the Charleston Area August 11-12”

TOSI Launches New Emergency Alert System

The Town of Seabrook Island is switching from Code Red to Everbridge, a mass notification system that delivers only critical, local emergency alerts.

With hurricane season underway, Everbridge will provide timely, area-specific warnings and instructions during weather events and other emergencies. ​

This system will be used exclusively for emergency notifications, including all alerts from the National Weather Service. To sign up or update your contact info, click here.

-Submitted by the Town of Seabrook Island

Midsummer Hurricane Preparedness Checklist 2026

Early September is peak hurricane season, so now is the time to complete any unfinished projects from the Early Summer Hurricane Preparedness Checklist and to move on to these important actions.

Prepare for any medical needs:

  • Click here for suggestions about planning for medication, medical equipment, and medical care needs.

Prepare for your pets’ needs:

  • Click here for more information.

Prepare for your neighbors:

  • Talk to your neighbors about your needs and theirs regarding preparing ahead for the storm and in the event of a major disaster. Consider exchanging keys. Click here for more information. 

Identify evacuation needs and options:

  • Will you need a handicapped room?
  • Will you need electric vehicle charging facilities?
  • Do you need a pet-friendly hotel?

Prepare your home and yard:

  • Use the August and September Brown and White Days to dispose of unwanted yard and garage items.
  • Recheck property readiness for a storm. Click here for information on securing your property. Click here to learn how to prepare your propane tank.
  • Clean out gutters and downspouts to prevent flooding and pressure on awnings.
  • Obtain Emergency Preparedness Brochures. Click here for links to several options.

Remember, be prepared; stay safe.

Our Hurricane Hints can be accessed at any time on the Tidelines website. Use the Hurricane Hints dropdown menu.

–Tidelines Editors

King Tides in the Charleston Area July 13-14

King Tide is a commonly used term describing high tides that are higher than normal. They usually occur during a full or new moon or during specific seasons throughout the year. Charleston’s average high tide range is about 5.5 ft., but during a king tide event, it can reach 7 ft. or higher. 

King Tides can cause flooding in low-lying areas, resulting in road closures on Seabrook Island, as well as the Johns Island and Charleston areas. This is particularly true when a king tide coincides with significant rain and/or wind.

The next dates of the predicted King Tides are July 13-14.

Continue reading “King Tides in the Charleston Area July 13-14”