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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 235 Pm Est Mon Dec 11 2023
Tonight..N winds 10 to 15 kt. Seas 2 to 3 ft.
Tue..NE winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft.
Tue night..NE winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 4 to 5 ft.
Wed..NE winds 20 kt with gusts to 25 kt. Seas 4 to 5 ft, building to 4 to 6 ft.
Wed night..NE winds 20 to 25 kt, increasing to 25 to 30 kt after midnight. Seas 4 to 6 ft, building to 5 to 7 ft.
Thu..NE winds 25 to 30 kt. Seas 6 to 8 ft, building to 7 to 9 ft.
Thu night..NE winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Seas 7 to 9 ft, subsiding to 6 to 8 ft.
Fri..NE winds 20 to 25 kt. Seas 6 to 8 ft. A slight chance of showers.
Fri night..NE winds 15 to 20 kt. Seas 5 to 7 ft. A slight chance of showers.
Sat..NE winds 15 to 20 kt. Seas 6 to 8 ft. A chance of showers.
Sat night..NE winds 15 to 20 kt. Seas 7 to 9 ft. A chance of showers.

AMZ300 235 Pm Est Mon Dec 11 2023
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will extend over the area this week. A coastal low pressure system may impact the region next weekend.

FXUS62 KCHS 112051 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 351 PM EST Mon Dec 11 2023

SYNOPSIS
High pressure will extend over the area this week. A coastal low pressure system may impact the region next weekend.

NEAR TERM /THROUGH TONIGHT/
Tonight: The broad, cyclonic flow aloft will become more zonal tonight as lingering east coast troughing finally propagates offshore. Broad high pressure centered over eastern Tennessee this afternoon will bridge into the North Carolina coastal plain by daybreak Tuesday. The boundary layer is expected to decouple across the interior later this evening, while a lingering pressure gradient along the coast will likely keep winds but there. Clear skies and calm/light winds should promote strong radiational cooling across the interior while the radiative process along the coast should be tempered. The coldest guidance of the 11/12z guidance was favored across the interior and Francis Marion National Forest where radiational cooling will be maximized, but trended closer to the guidance mean for the coastal counties. Lows will range from the lower 30s well inland (with some upper 20s possible in sheltered areas) with lower-mid 40s at the beaches and Downtown Charleston.

SHORT TERM /TUESDAY THROUGH THURSDAY/
High pressure is expected to dominate the pattern through the period with fair weather and temperatures slightly below normal.
Generally highs in the mid 50s to near 60. Lows around freezing west of I-95 and mid 30s to around 40 east/closer to the coast.
Lows moderating some by Thursday morning, with mid 30s well inland, and lower to mid 40s closer to the coast. A secondary cold front is shown by models to push through the area Wednesday night and Thursday. This will help to keep below normal temperatures as well as strengthen the northeasterly pressure gradient, especially along the coast and over the Atlantic waters.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/
Thursday night through Friday night: The latest models continue to indicate a relatively dry/precip. free pattern during this time. Temperatures near to slightly below normal. A weak coastal trough may form, which may produce isolated to scattered showers over the Atlantic waters. Some showers could skirt the immediate coastal areas. However, consistent with the previous forecast and latest guidance, have kept out any PoP mention through this period.

Saturday through Monday: The weather pattern becomes both more uncertain as well as potentially more unsettled. The global models show a strong upper low and/or trough moving from roughly eastern TX on Saturday, eastward across the Gulf coast states through the weekend and into Monday. There is considerable uncertainty with the evolution of this upper low and subsequent surface low center and associated deep layer moisture. For now, stuck with a blended model solution, which keeps a slow increase in PoPs through the weekend.
Generally have slight chance PoPs, mainly coastal areas Saturday, then chance PoPs all areas Sunday and Monday. Temperatures slightly above normal through this period, mainly kept in check due to cloud cover and increasing precip. chances.

AVIATION /18Z MONDAY THROUGH SATURDAY/
11/18z TAF discussion: KCHS/KJZI/KSAV: VFR through 12/18z.

Extended Aviation Outlook: VFR conditions expected to persist at least through Friday. The pattern will likely become more unsettled by Saturday, with brief flight restrictions in showers possible.

MARINE
Tonight: North winds will veer to the northeast overnight as high pressure builds into North Carolina. Winds will hold in the 10-15 kt range with seas 2-4 ft.

Tuesday through Saturday: A very unsettled pattern is expected through much of this period. Generally persistent, moderate to strong northeast flow is expected to continue through the period. Tuesday and Tuesday night should see conditions remaining below highlights, with winds of 10-15 knots and seas 3 to 5 feet. Expect SCA conditions to develop again by later Wednesday as the pressure gradient increases due to a secondary cold front pushing through the waters. Could see marginal/low end Gale conditions later Wednesday night and into Thursday behind this secondary front. Then conditions settling into solid SCA levels later Thursday through Saturday. Model guidance continues to show seas building through the period due to persistent, moderate to strong northeast winds. Seas could reach 5-10 feet Wednesday night/early Thursday, highest beyond 20 nm offshore. Then 5 to 8 feet nearshore later Thursday and Friday and 8 to 12 feet beyond 20 nm. May see even higher seas toward the weekend, depending on the evolution of a potential surface low center over the Gulf and nearshore Atlantic waters.

TIDES/COASTAL FLOODING
The threat for coastal flooding is expected to increase by mid week, and likely to continue into the weekend, due to increasing Astronomical tides northeast winds. For the Charleston and Colleton coasts: coastal flooding will become likely during the Wednesday morning high tide cycle, then possibly persisting during the morning high tide cycles into the weekend. For the remainder of the coast from Beaufort County, southward to McIntosh county: Coastal flooding becomes more likely by late week Thursday/Friday, then possibly persisting into the weekend.

EQUIPMENT
KCLX remains operational, but level 2 data is not being distributed to external users due to an internal hardware failure. We are still awaiting the arrival of new parts to resolve this problem. Until then, level 2 data will not be available. Radar data is available for all connected AWIPS users. Level 3 data is also available for some external users.

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

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Dog Hammock
Click for Map
Mon -- 12:31 AM EST     0.20 feet Low Tide
Mon -- 05:54 AM EST     Moonrise
Mon -- 07:03 AM EST     7.93 feet High Tide
Mon -- 07:14 AM EST     Sunrise
Mon -- 01:22 PM EST     0.34 feet Low Tide
Mon -- 04:09 PM EST     Moonset
Mon -- 05:22 PM EST     Sunset
Mon -- 07:16 PM EST     6.91 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Dog Hammock, Sapelo River, Georgia, Tide feet

Harris Neck
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Mon -- 12:41 AM EST     0.22 feet Low Tide
Mon -- 05:54 AM EST     Moonrise
Mon -- 07:14 AM EST     Sunrise
Mon -- 07:24 AM EST     8.24 feet High Tide
Mon -- 01:32 PM EST     0.37 feet Low Tide
Mon -- 04:09 PM EST     Moonset
Mon -- 05:22 PM EST     Sunset
Mon -- 07:37 PM EST     7.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Harris Neck, Barbour Island River, Georgia, Tide feet

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