September 10, 2025

Charleston Faces Coastal Flood Advisory as King Tide Approaches

Charleston, September 10, 2025

News Summary

Charleston, South Carolina, is under a coastal flood advisory due to an impending King Tide, with flooding expected to reach up to half a foot above ground level. The advisory, effective until noon, warns residents to prepare for saltwater inundation and take necessary safety precautions. Travelers are advised to avoid flooded areas while homeowners should protect their property. With high tides imminent, residents in low-lying regions are urged to seek higher ground and heed any evacuation orders as heavy rainfall may exacerbate conditions.

Charleston Faces Coastal Flood Advisory as King Tide Approaches

An updated coastal flood advisory has been issued for Charleston, South Carolina, by the National Weather Service (NWS) at 8:13 a.m. on Wednesday. This advisory is in effect from 9 a.m. until noon today, impacting Coastal Jasper and Beaufort Counties. The projection anticipates as much as half a foot of flooding above ground level along shorelines and tidal waterways, with water levels at Fort Pulaski expected to reach between 9.4 and 9.6 feet Mean Lower Low Water.

The high tide is anticipated to occur around 10:30 a.m. this morning. Residents are warned to prepare for possible saltwater inundation that may occur 1 to 2 hours before and after this high tide.

Travel Advisory and Safety Precautions

The NWS indicates that several roads may be affected by the saltwater inundation, urging travelers to allocate extra time for their journeys. It is essential for individuals not to drive around barricades or attempt to navigate through unfamiliar water depths. Homeowners in flood-prone areas are advised to take protective actions for their property.

Residents, particularly those in low-lying regions or camping areas, should seek higher ground without delay and adhere to any evacuation orders. If evacuation is deemed necessary, it is recommended to lock homes and disconnect utilities and appliances when time permits. Caution against entering basements or any rooms where electrical outlets may be at risk of submersion is strongly advised. Immediate evacuation is critical if sparks or unusual electrical noises are observed.

Dangers of Flood Waters

The advisory also highlights the hazards of entering flood waters, which may be electrified. Even a mere 6 inches of flowing water has the power to knock an adult off their feet. If trapped by moving water, individuals should aim to ascend to the highest possible point and contact emergency services by calling 911.

Weather Conditions Contributing to the Advisory

The coastal flood advisory remains valid until noon today. Heavy rainfall is anticipated, which may worsen flooding, particularly in vulnerable low-lying areas. Drivers should be cautious about traversing through water that may appear shallow; as little as 12 inches of moving water can wash away most vehicles. Hydroplaning, which occurs when a car slides uncontrollably on flooded roads, can be triggered by factors such as vehicle speed, tire tread, and the volume of water on the roadway.

The NWS forecast for tidal conditions incorporates astronomical predictions along with meteorological influences. The advisory encompasses multiple regions, including downtown Charleston and key coastal communities such as Hilton Head, Beaufort, and Myrtle Beach. Wind conditions combined with a stalled weather system are contributing to the King Tide conditions, which are expected to persist until early September 10.

Safety Measures for Coastal Areas

In addition to flooding, the risk of dangerous rip currents has been elevated to high from Long Island through the mid-Atlantic down to northern Florida. Residents are advised to remain vigilant and avoid coastal areas susceptible to flooding while exercising caution regarding surf conditions, particularly against King Tide effects.

Key Emergency Actions

Seek higher ground if in a flood-prone area.
Do not drive through barricaded areas or unknown water depths.
Disconnect utilities before evacuating if possible.
Avoid entering flooded rooms, especially where electrical outlets are present.
Dial 911 if trapped by moving floodwaters.

FAQ

What areas are affected by the coastal flood advisory in Charleston?

The advisory impacts Coastal Jasper and Beaufort Counties, including low-lying areas in downtown Charleston and other coastal communities like Hilton Head and Myrtle Beach.

How high can flooding reach during this advisory?

Flooding could reach up to half a foot above ground level, with water levels at Fort Pulaski projected between 9.4 and 9.6 feet.

What safety measures should residents take during the advisory?

Residents should seek higher ground, avoid driving through barricaded or flooded areas, and evacuate if necessary. Disconnecting utilities before leaving is also advised.

Chart of Key Advisory Features

Feature	Details
Advisory Status	Active until noon
Expected High Tide	10:30 a.m.
Affected Areas	Coastal Jasper and Beaufort Counties
Flooding Level	Up to 6 inches
Risk of Rip Currents	High