Savannah, GA to Altamaha Sound, GA including Grays Reef National Marine Sanctuary Marine Forecast
| Today...S Winds 10 To 15 Kt With Gusts To 20 Kt. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 9 Seconds And S 2 Ft At 4 Seconds. |
| Tonight...S Winds 10 To 15 Kt. Seas 3 Ft. Wave Detail: S 3 Ft At 4 Seconds And E 3 Ft At 9 Seconds. |
| Fri...Sw Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 9 Seconds And S 2 Ft At 5 Seconds. |
| Fri Night...S Winds 10 To 15 Kt. Seas 3 Ft. Wave Detail: Se 3 Ft At 9 Seconds. |
| Sat...Sw Winds 5 To 10 Kt, Becoming S 10 To 15 Kt In The Afternoon. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 8 Seconds. |
| Sat Night...S Winds 10 To 15 Kt. Seas 3 Ft. Wave Detail: S 3 Ft At 4 Seconds And Se 3 Ft At 8 Seconds. |
| Sun...Sw Winds 10 To 15 Kt. Seas 2 To 3 Ft. |
| Sun Night...N Winds 20 To 25 Kt With Gusts To 30 Kt. Seas 4 To 5 Ft. |
| Mon...Ne Winds 20 To 25 Kt With Gusts To 30 Kt. Seas 5 To 7 Ft. |
| Mon Night...E Winds 15 To 20 Kt. Seas 4 To 5 Ft. |
| Area Forecast Discussion National Weather Service Charleston SC 720am EDT Tuesday May 5 2026 .WHAT HAS CHANGED... The Aviation Section has been updated for the 12Z TAF issuance. .KEY MESSAGES... - 1) A cold front will bring an increased risk for showers and thunderstorms to the region Thursday into Saturday. KEY MESSAGE 1: A cold front will bring an increased risk for showers and thunderstorms to the region Thursday into Saturday. High pressure across the Atlantic will favor a light southerly flow across the Southeast United States in advance of an approaching cold front driven by a mid-level trough advancing across the Great Lakes/Ohio River Valley mid-week. Deep moisture (PWATs (Precipitable Waters) ~2.0 inches) is expected to advect across the local area on Thursday while warm conditions persist prior to the front arriving, but increasing cloud cover should limit instability when modest levels of shear associated with enhanced low-level wind fields arrive/develop across the Southeast Unites States while a strong h25 jet core passes inland and to the north. Timing of the front remains the most substantial uncertainty in regards to shower and thunderstorm arrival/coverage as well as the progression of the mid-upper level trough north of the region Thursday. Guidance remains rather split with cold frontal passage occurring between the Thursday evening through Friday morning time range, with the GFS (Global Forecast System) remaining the faster and more progressive solution along with dry high pressure occurring later Friday into Saturday, while the ECMWF (European Centre for Medium-Range Weather Forecasts) suggests a more stalling out of the front just south of the region as the mid-upper trough and surface front become much more displaced from each other. The later solution would result in precipitation activity holding across the local area through Friday and possibly through much of the day on Saturday, but rainfall totals and the risk for flooding (low) remain relatively similar under either scenario. Regardless of the the outcome, the environment supports at least scattered shower and thunderstorm activity Thursday and Friday as the front approaches and shifts across the region. Stronger thunderstorm chances remain low given frontal passage is likely to occur during overnight hours, but can't be ruled out if activity is able to maintain some organization while entering inland areas Thursday afternoon into early evening hours. Marine Southerly flow will strengthen ahead of an approaching cold front Thursday. There could be period of 25 kt winds and 6 ft seas over portions of the Charleston nearshore waters Thursday afternoon/evening. Small Craft Advisories may be needed. NOAA Charleston SC Office: Watches - Warnings - Advisories GA...None. SC...None. Marine None. |
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