A chance of showers in the evening, then showers likely after midnight. A slight chance of showers in the afternoon.

Showers likely with a chance of tstms.įri night.SW winds 10 to 15 kt with gusts to 20 kt. Showers.įri.SW winds 15 kt with gusts to 20 kt. Thu night.E winds 10 to 15 kt, becoming se after midnight.

A slight chance of showers and tstms in the afternoon. Thu.NE winds 5 kt, becoming E 10 to 15 kt with gusts to 20 kt in the afternoon. Tonight.NE winds 10 to 15 kt, diminishing to 5 to 10 kt late this evening. These predictions do not incorporate effects such as wind which can increase values by as much as 2 ft during non-tropical events.AMZ330 Charleston Harbor- 737 Pm Edt Wed Apr 26 2023 Click here to view other datums as well as the astronomical tide predictions for Charleston Harbor. Gage data plotted here is referenced to Mean Lower Low Water (MLLW). Mean Higher High Water (MHHW), which is used as a proxy for inundation. Older USGS topographic maps, MSL benchmarks Older USGS topographic maps, NGVD29 benchmarks Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps Also, areas that are normally under water could be exposed. This could cause navigation issues along the coast including tidal creeks, inlets, and in marsh areas. Other impacts outside of Downtown Charleston include minor flooding of low-lying locations near area beaches including Isle of Palms, Sullivan's Island, Folly Beach, Kiawah Island, and Edisto Island.Īt -1.5 ft MLLW, very low water levels will occur along the southeast South Carolina coast. As the tide height approaches 7.5 ft MLLW, roads can become impassable and closed. Minor flooding on roadways around Downtown Charleston occurs, possibly including Lockwood Drive, Wentworth and Barre, Fishburne and Hagood, and Morrison Drive. In Beaufort County, flooding will impact Hunting Island and the Sea Island Parkway near Chowan Creek Bridge.Īt 7.0 ft MLLW, minor coastal flooding typically begins. Other impacted areas include Long Point Road near Palmetto Islands County Park, locations around the Naval Complex, 12th and 15th Streets on Isle of Palms, and the road leading to Bohicket Marina on Seabrook Island. In Downtown Charleston, additional impacted roads include HW-17 at HW-61, Market Street, East Bay, Rutledge, and areas around MUSC.

Impacts become more extensive all along the southeast South Carolina coast including erosion at area beaches, with limited or no access to docks, piers, and some islands.Īt 7.5 ft MLLW, moderate coastal flooding occurs. Widespread flooding occurs in Downtown Charleston with numerous roads flooded and impassable and some impact to structures. Peak tide level reached in association with Hurricane Gracie which made landfall near Edisto Island, SC as a Category 4 hurricane on September 29th, 1959.Īt 8.0 ft MLLW, major coastal flooding occurs. Peak tide level reached in association with an unnamed hurricane that made landfall near Ossabaw Island, GA as a Category 2 hurricane on October 15th, 1947. Peak tide level reached in association with Hurricane David which made landfall near Sapelo Island, GA as a Category 1 hurricane on September 4th, 1979. Peak tide level reached in association with Hurricane Matthew which made landfall near McClellanville, SC as a Category 1 hurricane on October 8th, 2016. Peak tide level reached in association with Tropical Storm Irma on September 11th, 2017. Peak tide level reached in association with an unnamed hurricane that made landfall near Hilton Head Island, SC as a Category 2 hurricane on August 11th, 1940. Record tide level reached in association with Hurricane Hugo which made landfall at Sullivans Island, SC as a Category 4 hurricane at midnight September 22nd, 1989. If you notice any errors in the below information, please contact our Webmaster Is the approximate location based on the latitude/longitude coordinates Latitude/Longitude Disclaimer: The gauge location shown in the above map

Current tide graph charleston sc