Savannah, GA to Altamaha Sound, GA including Grays Reef National Marine Sanctuary Marine Forecast
|Tonight...Sw Winds 15 To 20 Kt, Diminishing To 10 To 15 Kt Late. Seas 2 To 3 Ft.|
|Mon...S Winds 5 To 10 Kt. Seas 2 Ft. A Slight Chance Of Showers And Tstms In The Afternoon.|
|Mon Night...S Winds 10 To 15 Kt. Seas 2 To 3 Ft. A Slight Chance Of Showers And Tstms.|
|Tue...S Winds 10 Kt. Seas 2 To 3 Ft. A Slight Chance Of Showers And Tstms.|
|Tue Night...S Winds 10 To 15 Kt. Seas 2 To 3 Ft. A Slight Chance Of Showers And Tstms In The Evening.|
|Wed...S Winds 10 To 15 Kt. Seas 2 To 3 Ft. A Slight Chance Of Showers And Tstms.|
|Wed Night...S Winds 10 To 15 Kt. Seas 3 To 4 Ft. A Slight Chance Of Showers And Tstms.|
|Thu...Sw Winds 10 To 15 Kt. Seas 2 To 3 Ft. A Chance Of Showers And Tstms.|
|Thu Night...Sw Winds 10 To 15 Kt. Seas 2 To 3 Ft. A Chance Of Showers And Tstms.|
|Fri...Sw Winds 10 To 15 Kt. Seas 2 To 3 Ft. A Chance Of Showers And Tstms.|
|Fri Night...Sw Winds 10 To 15 Kt. Seas 3 To 4 Ft. A Chance Of Showers And Tstms. Winds And Seas Higher In And Near Tstms.|
| Area Forecast Discussion|
National Weather Service Charleston SC
727pm EDT Sunday July 3 2022
High pressure will extend across the region this week before a front approaches next weekend.
Near Term - Until 6am Monday Morning
Early this evening: Radar imagery shows that convection coverage is isolated at this time, with all of it being along and west of I-95. A combination of the sea breeze and outflow boundaries continues to work inland and will likely continue to kick off additional isolated convection through the rest of the evening. Rain chances have been adjusted to highlight the interior of the forecast area for isolated coverage for the next several hours. The overall severe threat was already quite low, and it would be surprising for for any thunderstorms to become too strong through the late evening hours. There are no significant fog concerns overnight, and low temperatures should range in the low to mid 70s inland, and upper 70s along the coast.
Short Term - 6am Monday Morning Through Wednesday
High pressure will prevail through the period. On Monday, a weak cold front to the northeast will shift closer to the region. This will lead to an uptick in moisture (PWATs (Precipitable Waters) >2.0 inches) as well as forcing. This weather feature will support a decent chance for showers and thunderstorms, especially across interior areas. On the other hand, better instability is forecast just along the coast and with the sea breeze (or other mesoscale boundaries), could see a showers and thunderstorms just about anywhere in the CWA. In regards to severe weather, Storm Prediction Center has the area outlooked in general thunder. Then for Tuesday and Wednesday, a more typical summertime pattern will follow. By the afternoon hours, Probability of Precipitation up showers along the sea breeze and/or other boundaries will be possible. Then by sunset, any remaining showers/thunderstorms should quickly dissipate. High temperatures will be in the upper 80s to mid 90s each day with lows in the 70s.
Long Term - Wednesday Night Through Sunday
Aloft, ridging will prevail while surface high pressure remains centered over the Atlantic. On Thursday and Friday, weak troughing as well as any mesoscale boundaries that form could enhance showers and thunderstorms. Although, plentiful subsidence could prevent widespread rainfall. Then, over the weekend, a cold front is expected to move through the region. Ahead and along the front, showers and thunderstorms will be possible as a moist airmass enters the region. There are still some timing differences and placement inconsistencies though so details will have to be refined throughout the week. Otherwise, highs will be in the 80s to mid 90s with lows in the 70s.
Tonight: Sea breeze enhancements in the Charleston Harbor should diminish by late evening as the circulation moves farther inland and eventually breaks down. South to southwest winds 10-15 kt will prevail overnight with seas 2-3 ft.
Monday through Friday: High pressure will expand in the region through mid-week, leading to ideal marine conditions. Southerly winds at less than 15 knots will prevail with seas less than 4 feet. Towards the end of the week, weak troughing and an approaching cold front could lead to an enhanced pressure gradient and an uptick in winds/seas. Small Craft Advisories could eventually be needed.
NOAA Charleston SC Office: Watches - Warnings - Advisories