Sunrise 6:44 AM   Sunset 7:53 PM Moonrise 2:16 PM   Moonset 3:17 AM

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AMZ330 Charleston Harbor- 645 Pm Edt Thu Apr 18 2024
Tonight - SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Fri - SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts to 20 kt in the afternoon. A slight chance of showers and tstms in the afternoon. Fri night - S winds 10 to 15 kt, becoming sw 5 to 10 kt after midnight. A slight chance of showers and tstms in the evening. Sat - SW winds 5 to 10 kt. A chance of showers and tstms in the afternoon. Sat night - W winds 5 to 10 kt, becoming ne after midnight. A chance of showers and tstms. Sun - NE winds 10 to 15 kt. A chance of showers with a slight chance of tstms in the morning, then showers likely with a chance of tstms in the afternoon. Sun night - NE winds 10 to 15 kt. Showers. A chance of tstms, mainly in the evening. Mon - NE winds 10 to 15 kt. A slight chance of showers. Mon night - N winds 10 to 15 kt. Tue - NE winds 10 kt. Tue night - S winds 5 to 10 kt.
winds and waves higher in and near tstms.
unless otherwise noted, waves 1 foot or less.
charleston harbor water temperature 69 degrees.

AMZ300 645 Pm Edt Thu Apr 18 2024
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia - High pressure will persist through tonight. A slow moving front will bring unsettled weather to our area Friday through early next week. High pressure returns by the middle of next week.

FXUS62 KCHS 181951 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 351 PM EDT Thu Apr 18 2024

SYNOPSIS
High pressure will persist through tonight. A slow moving front will bring unsettled weather to our area Friday through early next week. High pressure returns by the middle of next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/
This Afternoon and Tonight: Zonal flow will prevail aloft while at the surface high pressure will hold strong. Dry conditions are expected through this afternoon and overnight, with temperatures reaching into the mid to upper 80s. A sea-breeze circulation has developed along the direct coastline, tipping winds to the S and limiting the high temperatures to the upper 70s along the beaches. Overnight will see little change in the large scale flow, resulting in continued quiet, rain-free conditions. Low temperatures are expected to only dip into the low to mid 60s.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/
Weak high pressure over the western Atlantic will shift east on Friday. Aloft, a weak shortwave will move off the coast in the morning, then relatively zonal flow will persist for the rest of the day into Friday night. The lowest 300 mb will feature 10-20 kt WNW flow through the afternoon. The resulting downslope compression will push highs into the upper 80s to around 90.
This will also produce large scale subsidence, limiting the potential for convection to develop. There will be a weak cold front sagging toward our NW zones late in the afternoon. Despite the subsidence, models show SBCAPE around 1500 J/kg and 30-40 kt bulk shear, so we cannot rule out isolated to scattered showers and tstms, mainly inland. And an isolated severe storm is not out of the realm of possibility.

Saturday will remain quite toasty due to the broad upper ridge and low-level compression along the southern edge of the backdoor front. Highs will be in the upper 80s to lower 90s. A bit more convective coverage is expected due to some late day upper shortwave energy, the weak surface boundary in the vicinity, and higher PWATs.

The upper level pattern changes drastically on Sunday as an upper trough progresses across the eastern United States and the surface front drops farther south. Temps will be considerably cooler on Sunday due to overcast skies and cool advection. Highs across inland SC could only be in the lower 70s, though farther south along the Altamaha River in GA we expect low to mid 80s.
Numerous to widespread showers and thunderstorms are expected, especially late in the day, due to strong synoptic scale forcing and ample low-level moisture.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/
Wet weather continues Sunday night as the primary shortwave swings through and a weak low moves up the coast. Some areas could see upwards of half an inch of precipitation (locally heavier). Rain should taper off by Monday morning as cool high pressure builds in.

AVIATION /19Z THURSDAY THROUGH TUESDAY/
VFR conditions will prevail at CHS/JZI/SAV terminals through 18Z Friday.

Extended Aviation Outlook: A slow moving front could bring occasional flight restrictions late Saturday through Monday.

MARINE
Tonight: Quiet conditions are forecast across the marine waters as high pressure remains the dominant feature across the region.
SW winds around 10 knots are forecast and seas averaging 2 to 3 ft.

A moderate S/SW flow Friday into Saturday will turn to the NE late Saturday night as a cold front drops through the area.
Sunday through Monday will feature the strongest winds of the period with readings occasionally ranging from 15-20 kt due to a tightening gradient. Slightly weaker NE flow expected Tuesday, then winds turn back to southerly by Wednesday as weak high pressure builds over the western Atlantic.

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

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Capers Creek
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Thu -- 04:16 AM EDT     Moonset
Thu -- 04:59 AM EDT     4.65 feet High Tide
Thu -- 06:44 AM EDT     Sunrise
Thu -- 10:57 AM EDT     0.95 feet Low Tide
Thu -- 03:15 PM EDT     Moonrise
Thu -- 05:34 PM EDT     4.42 feet High Tide
Thu -- 07:51 PM EDT     Sunset
Thu -- 11:14 PM EDT     0.85 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Capers Creek, South Capers Island, South Carolina, Tide feet

Charleston Harbor Entrance
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Thu -- 01:20 AM EDT     0.97 knots Max Flood
Thu -- 04:17 AM EDT     Moonset
Thu -- 05:14 AM EDT     -0.00 knots Slack
Thu -- 06:45 AM EDT     Sunrise
Thu -- 08:40 AM EDT     -1.65 knots Max Ebb
Thu -- 11:46 AM EDT     0.00 knots Slack
Thu -- 01:51 PM EDT     1.01 knots Max Flood
Thu -- 03:16 PM EDT     Moonrise
Thu -- 05:47 PM EDT     -0.00 knots Slack
Thu -- 07:52 PM EDT     Sunset
Thu -- 09:08 PM EDT     -1.66 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION

Charleston Harbor Entrance, South Carolina Current, knots

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