Sunrise 6:14 AM   Sunset 8:32 PM Moonrise 2:46 AM   Moonset 5:52 PM

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AMZ330 Charleston Harbor- 129 Am Edt Wed Jul 3 2024
Rest of tonight - E winds 10 to 15 kt, becoming ne 5 to 10 kt late. A slight chance of showers late. Wed - NE winds 5 to 10 kt, becoming E 10 to 15 kt with gusts to 20 kt in the afternoon. A chance of showers in the morning, then a slight chance of showers and tstms in the afternoon. Wed night - E winds 10 to 15 kt with gusts to 20 kt, diminishing to 5 to 10 kt after midnight. Thu - NE winds 5 kt, becoming se in the afternoon. Thu night - S winds 10 kt, diminishing to 5 kt after midnight. Fri - S winds 5 to 10 kt. Fri night - S winds 5 to 10 kt. Sat - S winds 5 to 10 kt. A slight chance of showers and tstms. Sat night - S winds 5 to 10 kt. A chance of showers and tstms. Sun - S winds 5 to 10 kt. A chance of showers and tstms. Sun night - S winds 5 to 10 kt. A chance of showers and tstms.
winds and waves higher in and near tstms.
unless otherwise noted, waves 1 foot or less.
charleston harbor water temperature 85 degrees.

AMZ300 129 Am Edt Wed Jul 3 2024
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia - A weak area of low pressure will linger across southeast georgia through Wednesday. Through the rest of the week, a hot and humid air mass will build over the region. A weak cold front could approach the region by early next week.

FXUS62 KCHS 030535 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 135 AM EDT Wed Jul 3 2024

SYNOPSIS
A weak area of low pressure will linger across Southeast Georgia through Wednesday. Through the rest of the week, a hot and humid air mass will build over the region. A weak cold front could approach the region by early next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/
Early this morning: Radar imagery shows that shower activity is trying to get going across the coastal waters within a zone of subtle convergence and precipitable water values of 2-2.25 inches. Model guidance favors this activity across the waters and along the coast from Chatham County up through Charleston County, and that what the forecast generally follows. The best chance for showers will be along the coast, decreasing chances as you move inland.

SHORT TERM /6 AM THIS MORNING THROUGH FRIDAY/
Wednesday: A weakening stationary front or surface trough will remain across southeast GA through the afternoon. The HRRR indicates a pool of 1500 to 2000 J/kg of CAPE will remain along and south of the trough. At the surface, the center of a 1020 mb high will remain off the mid-Atlantic coast, resulting in broad east flow across the forecast area. As temperatures warm into the upper 80s to lower 90s, a seabreeze should develop and advance inland during the afternoon hours. Scattered to numerous showers and thunderstorms are expected to form over the coastal waters of GA early Wednesday morning, the convention is expected to spread onshore generally south of the Savannah River from midday through the afternoon.

Independence Day: A large H5 ridge will expand across the Deep South and Southeast US region. Forecast soundings indicate a subsidence inversion centered at H75. This inversion should maintain at 30 to 50 J/kg of CIN through the heat of the afternoon. In addition, PW values should remain limited to 1.5 inches across the region. As a result, the forecast will feature dry conditions through much of the day. However, a SCHC PoPs are possible across portions of southeast GA, and the far inland counties of SC. Little to no QPF is expected. Given the position of the mid-level ridge, and expected partly sunny conditions, temperatures are forecast to peak in the mid to upper 90s with heat index values between 100 and 105.

Friday: GFS indicates that the center of the +590 DM ridge will remain over the Deep South. Forecast soundings indicate that the subsidence inversion will remain centered at H75, resulting in at least weak capping. However, given the passage of a weak late afternoon sea breeze, isolated showers and thunderstorms may develop during the afternoon. High temperatures should range in the mid to upper 90s for most areas. In addition, dewpoints along and behind the sea breeze may increase into the mid to upper 70s, with a few spots reaching the low 80s. Heat index values may exceed 108 in spots, especially across portions of the SC Lowcountry.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/
The mid-level pattern through the long term will be very interesting. The ridge will generally remain across the Southeast U.S. as a closed low associated with TC Beryl enters the western Gulf of Mexico. To the east, GFS and ECMWF indicate that a closed low south of Bermuda will drift toward the Southeast coast. As a result, moisture will gradually build across the region under the ridge, especially as the closed low over the Atlantic approaches from the east. At the sfc, a weak cold front will approach from the west, expected to become nearly stationary east of the Appalachians early next week. This pattern should support generally diurnal showers and thunderstorms, greatest coverage expected on Monday and Tuesday.
Conditions will remain hot across the CWA, high in the mid to upper 90s with heat index values around Heat Advisory values.

AVIATION /06Z WEDNESDAY THROUGH SUNDAY/
The 06z TAF period begins with VFR conditions at KCHS, KJZI, and KSAV. The biggest concerns through the overnight will be showers and MVFR ceilings at KSAV and possibly KJZI. Radar imagery shows shower activity along the Chatham County coast that could approach KSAV over the next couple of hours. Showers and possible ceilings are less certain at KJZI, and we have kept the forecast VFR at both KCHS and KJZI. Other than some coastal showers in the morning, very little convective coverage is expected this afternoon and evening.

Extended Aviation Outlook: Brief flight restrictions are possible in showers and thunderstorms, mainly in the afternoon and evening through the period.

MARINE
Tonight: Winds continue to frequently gust 25-30 kt across South Carolina nearshore waters and the Savannah River Entrance this afternoon as pinched gradient conditions persist. Models have not handled the evolution of the pinched gradient well at all today. Given the current trends, the advisory has been extended until 6 PM. Winds should diminish after this the front begins to buckle north and resulting pinched gradient relaxes a bit. Seas will diminishing to 2-4 ft through the night.

Wednesday through Sunday: Winds are forecast to remain from the northeast on Wednesday, generally between 10 to 15 kts. Seas will range between 2 to 3 ft. Thursday through this weekend, south winds are forecast to remain less than 15 kts. Seas will favor values between 2-3 ft.

TIDES/COASTAL FLOODING
Another round of minor coastal flooding will be possible at Charleston with the Wednesday evening high tide cycle.

CHS WATCHES/WARNINGS/ADVISORIES
GA...None.
SC...None.
MARINE...None.

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Cainhoy
Click for Map
Tue -- 12:07 AM EDT     0.51 feet Low Tide
Tue -- 03:01 AM EDT     Moonrise
Tue -- 06:15 AM EDT     Sunrise
Tue -- 06:19 AM EDT     5.50 feet High Tide
Tue -- 12:08 PM EDT     -0.25 feet Low Tide
Tue -- 05:44 PM EDT     Moonset
Tue -- 06:57 PM EDT     7.21 feet High Tide
Tue -- 08:31 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Cainhoy, Wando River, South Carolina, Tide feet

Charleston Harbor Entrance
Click for Map
Tue -- 12:10 AM EDT     0.00 knots Slack
Tue -- 02:11 AM EDT     1.26 knots Max Flood
Tue -- 03:02 AM EDT     Moonrise
Tue -- 05:50 AM EDT     -0.00 knots Slack
Tue -- 06:15 AM EDT     Sunrise
Tue -- 09:14 AM EDT     -2.25 knots Max Ebb
Tue -- 12:11 PM EDT     0.00 knots Slack
Tue -- 02:39 PM EDT     1.78 knots Max Flood
Tue -- 05:44 PM EDT     Moonset
Tue -- 06:42 PM EDT     -0.00 knots Slack
Tue -- 08:31 PM EDT     Sunset
Tue -- 09:56 PM EDT     -2.62 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION

Charleston Harbor Entrance, South Carolina Current, knots

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