Sunrise 6:42 AM   Sunset 7:54 PM Moonrise 3:13 PM   Moonset 3:44 AM

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AMZ330 Charleston Harbor- 336 Am Edt Fri Apr 19 2024
Today - SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. A slight chance of showers and tstms late. Tonight - SW winds 5 to 10 kt. Sat - SW winds 5 to 10 kt. A chance of showers and tstms in the afternoon. Sat night - SW winds 5 to 10 kt, becoming ne after midnight. A chance of tstms. A chance of showers. Sun - NE winds 10 to 15 kt. A slight chance of tstms. A chance of showers in the morning, then showers likely in the afternoon. Sun night - N winds 15 kt with gusts to 20 kt. A slight chance of tstms. Showers likely. Mon - NE winds 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 336 Am Edt Fri Apr 19 2024
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia - A slow moving front will bring unsettled weather to the region today through early next week. High pressure will then return and prevail into the middle of next week.

FXUS62 KCHS 190555 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 155 AM EDT Fri Apr 19 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 THIS MORNING/
Tonight: Zonal flow will prevail aloft while high pressure maintains a hold across the Southeast. Winds have decoupled well inland while some mid and high level clouds move in from the west in advance of subtle shortwave energy approaching the local area within a few hours of daybreak. A modest amount of radiational cooling will take place until cloud cover increases late, while a light southwest wind maintains temps a few degrees warmer closer to the coast. Overnight lows should dip into the low-mid 60s inland and into the mid-upper 60s closer to the coast.

Some guidance does hint at a few light showers approaching far western zones prior to daybreak as h5 shortwave energy traverses aloft, but low-mid lvl dry air will likely limit the potential. A dry forecast will therefore remain in place of all locations through the night.

SHORT TERM /6 AM THIS 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 /06Z FRIDAY THROUGH TUESDAY/
VFR conditions will prevail at CHS/JZI/SAV terminals through 06Z Saturday. The risk for a shower/thunderstorm at CHS/JZI Friday afternoon remains too low to include at this time.

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

MARINE
Tonight: Quiet conditions remain across local marine waters as high pressure remains the dominant feature across the region.
Southwest winds will peak no higher than 10-15 kt, with seas averaging between 2-3 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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Ben Sawyer Bridge
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Fri -- 04:43 AM EDT     Moonset
Fri -- 05:53 AM EDT     4.83 feet High Tide
Fri -- 06:44 AM EDT     Sunrise
Fri -- 11:48 AM EDT     0.75 feet Low Tide
Fri -- 04:12 PM EDT     Moonrise
Fri -- 06:26 PM EDT     4.83 feet High Tide
Fri -- 07:52 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Ben Sawyer Bridge, ICWW, South Carolina, Tide feet

Charleston Harbor Entrance
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Fri -- 12:10 AM EDT     0.00 knots Slack
Fri -- 02:15 AM EDT     1.05 knots Max Flood
Fri -- 04:43 AM EDT     Moonset
Fri -- 06:04 AM EDT     -0.00 knots Slack
Fri -- 06:44 AM EDT     Sunrise
Fri -- 09:28 AM EDT     -1.76 knots Max Ebb
Fri -- 12:32 PM EDT     0.00 knots Slack
Fri -- 02:46 PM EDT     1.17 knots Max Flood
Fri -- 04:12 PM EDT     Moonrise
Fri -- 06:38 PM EDT     -0.00 knots Slack
Fri -- 07:52 PM EDT     Sunset
Fri -- 09:56 PM EDT     -1.89 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION

Charleston Harbor Entrance, South Carolina Current, knots

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