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AMZ330 Charleston Harbor- 1000 Pm Est Tue Dec 5 2023
Tonight..W winds 10 to 15 kt, becoming nw 15 to 20 kt after midnight. Waves building to 1 to 2 ft.
Wed..NW winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft.
Wed night..N winds 10 to 15 kt.
Thu..N winds 5 to 10 kt, becoming W in the afternoon.
Thu night..W winds 5 kt.
Fri..W winds 5 to 10 kt.
Fri night..S winds 5 kt, becoming W after midnight.
Sat..SE winds 5 to 10 kt. A slight chance of showers.
Sat night..SE winds 10 to 15 kt. A chance of showers.
Sun..SW winds 15 to 20 kt. Waves 1 to 2 ft. Showers likely.
Sun night..NW winds 15 to 20 kt. Waves 1 to 2 ft. A chance of showers.
unless otherwise noted, waves 1 foot or less.
charleston harbor water temperature 60 degrees.

AMZ300 1000 Pm Est Tue Dec 5 2023
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A dry cold front will drop through the area tonight, followed by high pressure through Saturday. The next weather system will arrive Saturday night into Sunday. High pressure will return early next week.

FXUS62 KCHS 060329 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1029 PM EST Tue Dec 5 2023

SYNOPSIS
A dry cold front will drop through the area tonight, followed by high pressure through Saturday. The next weather system will arrive Saturday night into Sunday. High pressure will return early next week.

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/
Lingering jet stream induced cirrus will continue to diminish, leading to mostly clear to clear skies through the bulk of the night. Some of the upstream stratocumulus associated with a short wave digging the southeast coast late will move in a few hours before daybreak. This short wave will force a dry cold front into the ocean before daybreak, although the front comes through completely rainfree with sparse moisture and little to no convergence.

Cold advection in wake of the front will keep things mixed through the night, and the hourly temps will jump around some, dependent upon how much wind at any given time. Expect min temps mainly 40-45F degrees inland from US-17, with maybe a few pockets in the upper 30s far northwest tier. Mid and upper 40s will be more common in the Charleston and Savannah metros, on the barrier islands, and right along the downwind sides of Lake Moultrie.

Winds on Lake Moultrie will become NW 15-20 kt and a little gusty after midnight with increasing cold advection. But not enough for a Lake Wind Advisory.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/
An upper trough and its associated surface cold front will push offshore early Wednesday. Although there could be a few showers associated with the FROPA over the offshore waters in the morning, land areas are expected to stay dry. An enhanced pressure gradient behind the departing front will lead to breezy conditions Wednesday with gusts around 20 mph. Gusts around 20 kt across Lake Moultrie could approach 25 kt, but at this point a Lake Wind Advisory is not expected, as conditions should remain shy of criteria. Cool high pressure will build in the wake of the front, which will shift overhead on Thursday. Model soundings show increasing subsidence Wednesday into Thursday, and coupled with a dry air mass, will result in clear skies both days.

By Friday, the surface high will propagate eastward into the Atlantic. Cloud cover will increase as return flow draws Gulf moisture into the region. Still, no precipitation is expected Friday as the area remains largely under the influence of high pressure and lingering subsidence.

Temperatures will be cooler Wednesday and Thursday, with highs in the mid/upper 50s. Friday will be slightly warmer with highs in the low to mid 60s. Wednesday night will be the coldest night of the week with locations away from the coast plummeting below freezing.
Some spots could even dip into the upper 20s far inland. Closer to the coast, lows will range from the mid to upper 30s. Thursday night is not expected to be as cold with min temperatures a few degrees warmer.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/
Shortwave energy aloft and return flow feeding deeper moisture into the Southeast U.S. could generate shower activity Saturday, mainly along the coastal areas where we show POPs around 20-30%. A deep upper trough and strong cold front will then approach from the west Saturday night before crossing the area Sunday. This system could bring scattered to numerous showers to the area. Rain chances will ramp up Saturday night before clearing out Sunday night. Thereafter, high pressure will build across the eastern U.S. early next week.
Mild, above normal temperatures over the weekend will decrease to slightly below normal behind the front early next week.

AVIATION /03Z WEDNESDAY THROUGH SUNDAY/
VFR conditions will to prevail at KCHS, KJZI, and KSAV terminals through 00Z Thursday. N-NW winds will be gusty as deep mixing develops and the gradient tightens from strong high pressure centered in the lower and middle Mississippi Valley. Speeds will average around 15 kt with gusts near or in excess of 20 kt, before dropping considerably around sunset.

Extended Aviation Outlook: VFR through Saturday morning. Gusty winds around 15-20 kt are possible at the terminals on Wednesday.

MARINE
Tonight: A fast moving, but dry cold front will cross into and through the coastal waters during the late overnight hours.
Increasing cold advection allowing for sufficient mixing of 30 kt of geostrophic winds, and modest isallobaric pressure climbs will lead to Small Craft Advisories on all Atlantic waters.
Mariners can expect winds to veer to the NW, increasing to near 20 kt with gusts of 25+ kt. Charleston Harbor won't get winds quite high enough for an advisory, but will be close. The offshore wind trajectories will limit seas to 2-4 feet within 20 nm, but with a longer fetch, the outer Georgia waters will have seas as high as 5 feet.

Wednesday through Sunday: Small Craft Advisories for gusty northwest winds will continue into Wednesday night for all local waters outside the Charleston Harbor. Gusty winds and elevated seas around 3-5 feet will subside Thursday as conditions improve due to high pressure settling across the area. Thereafter, tranquil conditions are expected into Saturday with light winds and calm seas before conditions deteriorate quickly late Saturday night ahead of a strong cold front.

CHS WATCHES/WARNINGS/ADVISORIES
GA...None.
SC...None.
MARINE...Small Craft Advisory until 10 PM EST Wednesday for AMZ350.
Small Craft Advisory from 4 AM to 10 PM EST Wednesday for AMZ352-354.
Small Craft Advisory until 1 AM EST Thursday for AMZ374.

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Lower Toogoodoo Creek
Click for Map
Tue -- 12:00 AM EST     Moonrise
Tue -- 12:51 AM EST     Last Quarter
Tue -- 02:52 AM EST     5.68 feet High Tide
Tue -- 07:08 AM EST     Sunrise
Tue -- 08:13 AM EST     1.62 feet Low Tide
Tue -- 01:05 PM EST     Moonset
Tue -- 03:02 PM EST     6.30 feet High Tide
Tue -- 05:14 PM EST     Sunset
Tue -- 08:50 PM EST     1.45 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Lower Toogoodoo Creek, 2 mi. above entrance, South Carolina, Tide feet

Charleston Harbor Entrance
Click for Map
Tue -- 12:51 AM EST     Last Quarter
Tue -- 01:43 AM EST     -0.00 knots Slack
Tue -- 05:07 AM EST     -1.35 knots Max Ebb
Tue -- 07:06 AM EST     Sunrise
Tue -- 08:14 AM EST     0.00 knots Slack
Tue -- 10:33 AM EST     1.17 knots Max Flood
Tue -- 01:04 PM EST     Moonset
Tue -- 01:55 PM EST     -0.00 knots Slack
Tue -- 05:12 PM EST     Sunset
Tue -- 05:29 PM EST     -1.51 knots Max Ebb
Tue -- 08:54 PM EST     0.00 knots Slack
Tue -- 11:06 PM EST     1.07 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION

Charleston Harbor Entrance, South Carolina Current, knots

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Charleston, SC,