Marine Weather Net

Charleston Harbor Marine Forecast


TODAY

SW
WINDS
5 KNOTS

TONIGHT

W
WINDS
5 KNOTS

SUN

NE
WINDS
5 - 10
KNOTS

SUN NIGHT

NE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
AMZ330 Forecast Issued: 957 AM EST Sat Mar 02 2024

Today...Sw Winds 5 Kt. Patchy Fog This Morning. A Slight Chance Of Showers.
Tonight...W Winds 5 Kt In The Evening, Becoming Variable. A Slight Chance Of Showers In The Evening. Patchy Fog After Midnight.
Sun...Ne Winds 5 To 10 Kt. Patchy Fog In The Morning. A Chance Of Showers.
Sun Night...Ne Winds 5 To 10 Kt.
Mon...Ne Winds 5 To 10 Kt.
Mon Night...Ne Winds 5 To 10 Kt.
Tue...E Winds 5 To 10 Kt. A Slight Chance Of Showers.
Tue Night...Se Winds 10 Kt. Showers Likely With A Slight Chance Of Tstms.
Wed...S Winds 15 Kt. Showers With A Slight Chance Of Tstms.
Wed Night...W Winds 10 To 15 Kt. A Chance Of Showers. Winds And Waves Higher In And Near Tstms. Unless Otherwise Noted, Waves 1 Foot Or Less. Charleston Harbor Water Temperature 57 Degrees.
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Area Forecast Discussion
National Weather Service Charleston SC
1029am EST Sat Mar 2 2024

Synopsis
A stationary front will linger over the area through Sunday. High pressure will briefly build in Monday, then a low pressure system will affect the area Tuesday through Thursday.

Near Term - Through Tonight
Today: Observations and webcams indicate that there is still some patchy fog around the forecast area. But visibilities for the most part are no worse than 3/4 to 1 mile. Visibilities will continue to improve through the day, although some coastal areas might have the fog persisting through the afternoon.

Channeled vorticity and a jet streak aloft will combine with weak isentropic ascent to produce isolated to scattered showers through the day. Initially this activity will be along our northwest tier. But the better chances will occur over southern and eastern sections this afternoon due to higher temperatures and dew points, and proximity to the wedge front. Quantitative Precipitation Forecast will be nothing like yesterday, and mainly 1/4 inch or less. However, there are indications that isolated t-storms could occur, especially south of I-16 in Georgia. This is where some guidance depicts MLCAPE as great as 500 J/kg. Should any t-storms actually happen, then locally higher amounts would transpire.

Temperatures are a considerable challenge, dependent upon where the wedge front actually positions itself. We show mid and upper 60s most communities, as they are higher to begin with. But many far interior sections might not even get out of the 50s. Expect there to be further adjustments to the hourly temperatures and maximum values with the next update.

Tonight: Mostly dry conditions are expected. The only exception could be across interior Southeast Georgia where guidance shows a slight uptick in isentropic lift atop the lingering wedge for a few hours this evening. Several of the higher resolution CAMs support isolated shower activity in this area, so slight chance probability of precipitation were highlighted through midnight to account for this. Otherwise, widespread low stratus is likely with some degree of stratus build-down likely occurring. Similar to this morning, some reductions in visibilities are expected as cigs lower, but it remains unclear exactly how low visibilities will get. Dense fog could occur, especially across the interior where the wedge is the strongest. Patchy fog was introduced to trend the forecast, but greater coverage qualifiers may be needed. Lows will range from the mid 50s well inland to the upper 50s/near 60 at the coast.

Short Term - Sunday Through Tuesday
Troughing aloft will prevail over the southeastern states Sunday and into Monday. The trough will slowly ripple towards the Mid- Atlantic coast late Monday and into Tuesday. At the surface a front will remain stalled within the vicinity of the forecast area Sunday and into Monday.

Isolated to possibly scattered showers and maybe a thunderstorm are possible on Sunday as southwesterly flow aloft and the stalled front yield PWATs (Precipitable Waters) upwards of 1.3 inches. Precipitation will wane into the evening hours as the front slowly drifts slightly further away from the local forecast area. Temperatures will likely reach into the low to mid 70s, with overnight lows only dipping into the upper 50s.

Monday and Tuesday morning will likely be rain-free, although mostly cloudy. Rain will begin to move into the region later Tuesday as another shortwave ripples across the southeastern states. Temperatures will continue to be above normal with daytime highs reaching into the mid 70s and overnight lows only falling to the mid to upper 50s.

Long Term - Tuesday Night Through Friday
A series of shortwave troughs will ripple across the southeastern states through the long term period, bringing unsettled weather conditions. There is some model disagreement on the timing of the rounds of precipitation, however scattered to widespread showers and possibly a thunderstorm or two will be possible Tuesday night into Friday. Continued southwesterly flow aloft will advect warm, moist air into the region, allowing temperatures to remain above normal into the weekend.

Marine
Today: There are still some pockets of dense fog over the nearshore waters from Edisto Beach south to the Altamaha Sound. And a recent Savannah Pilot report indicates that the Port of Savannah is still closed due to the fog. As a result, we have extended the Dense Fog Advisory until 1 PM.

Today: Winds will begin to shift to the west and southwest this morning, then shift more southerly along the Georgia coast this afternoon. Speeds will generally remain 10 kt or less. Seas will subside to 3-5 ft nearshore waters this afternoon with 4-6 ft over the Georgia offshore leg. Seas will remain near 6 ft over the South Carolina waters and the Georgia offshore waters this morning, where Small Craft Advisories remain. Patchy to areas fog are likely to persist this morning, especially near the coast.isory through 1 PM.

Otherwise, light wind fields will prevail through the day as a stationary front lingers nearby. Seas though do remain elevated, enough so that we have Small Craft Advisories for 6+ foot waves over the nearshore Charleston County waters and the Georgia waters beyond 20 nm offshore.

Tonight: A somewhat chaotic wind field is expected this evening before directions become more northerly through the night. Winds will hold less than 10 kt with seas subsiding to 2-4 ft nearshore waters and 3-5 ft over the Georgia offshore waters. Patchy fog will occur overnight, especially near the coast.

Sunday through Thursday: Conditions across the marine waters will likely stay below Small Craft Advisory criteria through about mid-week when seas could build to 6 ft across some zones. Scattered to numerous showers and some thunderstorms will be possible Tuesday into the end of the week. NE winds Monday and Tuesday will shift to the SW by Wednesday, averaging 10 to 15 knots.

Equipment
There is an issue with the ASOS at the Savannah International Airport (KSAV) which is making many of the unit's sensors inoperable. Technicians will be on site later today to attempt repairs. Users should use data from this site with caution.

NOAA Charleston SC Office: Watches - Warnings - Advisories
GA...None. SC...None.

Marine
Small Craft Advisory until 4pm EST this afternoon for AMZ350. Dense Fog Advisory until 1pm EST this afternoon for AMZ352- 354. Small Craft Advisory until 6pm EST this evening for AMZ374.