Sunrise 6:42 AM   Sunset 7:55 PM Moonrise 4:08 PM   Moonset 4:09 AM

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AMZ330 Charleston Harbor- 314 Am Edt Sat Apr 20 2024
Today - W winds 5 to 10 kt, becoming sw 10 to 15 kt late. A slight chance of showers and tstms late. Tonight - SW winds 5 to 10 kt, becoming nw after midnight. A chance of showers and tstms in the evening, then showers and tstms likely after midnight. Sun - NE winds 5 to 10 kt, becoming N 10 to 15 kt with gusts to 20 kt in the afternoon. A chance of showers and tstms in the morning, then showers with a slight chance of tstms in the afternoon. Sun night - N winds 15 kt with gusts to 20 kt. Showers with a slight chance of tstms in the evening, then showers likely after midnight. Mon - NE winds 10 to 15 kt with gusts to 20 kt. A chance of showers, mainly in the morning. Mon night - NE winds 10 kt. A slight chance of showers. Tue - NE winds 10 kt. Tue night - SE winds 10 kt. Wed - SW winds 10 kt. Wed night - SW winds 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 314 Am Edt Sat Apr 20 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 this weekend. High pressure will then return and prevail into the middle of next week.

FXUS62 KCHS 200419 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1219 AM EDT Sat Apr 20 2024

SYNOPSIS
A slow moving front will bring unsettled weather to the region Saturday through early next week. High pressure will then return and prevail into the middle of next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/
Quiet conditions will prevail for the rest of tonight. The risk for measurable rainfall has largely ended and mentionable pops have been removed from the gridded and text forecasts. Lows from the mid 60s well inland to the upper 60s/near 70 at the beaches and Downtown Charleston look on track.

SHORT TERM /6 AM THIS MORNING THROUGH MONDAY/
Mid-level ridging will be centered across the southern Gulf of Mexico Saturday with a shortwave over southeast Texas slowly heading east. Across eastern Canada, a longwave trough will slowly translate off the coast with a weak cold front oozing to the south. The first batch of precipitation is forecast to arrive with the shearing out wave (originating from Texas)
Saturday afternoon into evening. PWATs ahead of the wave Saturday are forecast to be around 1.4" along with warm cloud depths around 7kft. Initially, precipitation will likely struggle to hold together across the Low Country due to the dry air. Expect high temperatures in the upper 80s.

By 5 PM and 8 PM showers and thunderstorms will fill in towards the coast Saturday. MLCAPE values are forecast to be around 1000 J/kg which will support thunder across all zones. The wave will then start to exit the coast Sunday morning with precipitation temporarily coming to an end and a weak cold front oozing to the SC coastline.

Another wave will then approach the area Sunday afternoon and is slightly more amplified that in previous runs. As this occurs, surface cyclogenesis will occur off the coast of South Carolina in association with the stalled frontal zone. Some global guidance is indicating weak FGEN forcing occurring around 875 mb with the QPF field responding by arching back into a slight banded feature. Given that the forcing is weak, most of the area will likely see precipitation Sunday afternoon, but the focus of the QPF being towards the Midlands of SC. Expect high temperatures in the 60s interior SC Sunday, and upper 70s forecast over GA (or south of the cold front).

Sunday night into Monday, temperatures will fall into the 50s across the region. Latest global guidance continues to struggle with Monday as another mid-level low, potentially rather amplified, will cross the area. The latest run of the GEFS is by far the most amplified, while the GEPS is the least amplified.
For now, have introduced PoPs into the forecast for Monday to account for this.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/
Strong DAVA will set in across Georgia and South Carolina for Tuesday as a mid-level low pressure exits the region. Temperatures will fall below normal with no precipitation expected. Wednesday into Thursday a strong closed low pressure is forecast to move across the Great Lakes with the core of the DCVA remaining well north of the area. Another cold front is then forecast to cross the area Thursday into Friday. No precipitation is currently expected with this frontal passage either.

AVIATION /04Z SATURDAY THROUGH WEDNESDAY/
20/06z TAF Discussion: KCHS/KJZI/KSAV: VFR for much of the period. An isolated shower/tstm could develop along the mid-late afternoon sea breeze circulation, but impact chances are too low to mention at this time at any of the three terminals. Rain chances will increase this evening as a southern stream shortwave moves across the region. Shower/tstms could impact KSAV first, then spread into both Charleston terminals later in the evening. VCTS was highlighted at KSAV by 01z and KCHS and KJZI by 03z to account for this. Confidence in timing/intensity is not high enough to show a TEMPO or prevailing group at either terminal.
These will be reconsidered for the 12z TAF cycle after the ingest and interrogation of additional model data later this morning.

Extended Aviation Outlook: A slow moving front will bring multiple rounds of flight restrictions Saturday night through Sunday.
Further restrictions are possible Monday as low level moisture remains trapped behind a frontal inversion. VFR conditions are then forecast Tuesday and Wednesday as surface high pressure approaches from the west.

MARINE
Overnight: A modest S to SW flow will continue through tonight as high pressure remains offshore and a cold front drops into the Southeast. Winds will be no higher than 10-15 kt, with 2-3 ft seas.

Saturday through Wednesday: South to southwest winds will persist Saturday as a cold front slowly oozes towards the coast. Weak surface cyclogenesis will then occur Sunday afternoon with winds turning around from the northeast. Winds will then continue to increase in speed and be sustained 20 to 25 kts with gusts 25 to to 30 kt. The highest probability for Small Craft Advisories appear to be in the Atlantic waters adjacent to Charleston. Expect seas 4 to 6 ft. Winds will start to relax from the northeast Tuesday morning and slowly veer around from the southwest Tuesday afternoon into Wednesday.

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

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Drayton
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Sat -- 12:56 AM EDT     0.66 feet Low Tide
Sat -- 05:09 AM EDT     Moonset
Sat -- 06:44 AM EDT     Sunrise
Sat -- 07:08 AM EDT     5.47 feet High Tide
Sat -- 01:17 PM EDT     0.56 feet Low Tide
Sat -- 05:07 PM EDT     Moonrise
Sat -- 07:38 PM EDT     5.73 feet High Tide
Sat -- 07:54 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Drayton, Bee's Ferry, Ashley River, South Carolina, Tide feet

Charleston Harbor Entrance
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Sat -- 12:59 AM EDT     0.00 knots Slack
Sat -- 03:06 AM EDT     1.19 knots Max Flood
Sat -- 05:08 AM EDT     Moonset
Sat -- 06:43 AM EDT     Sunrise
Sat -- 06:49 AM EDT     -0.00 knots Slack
Sat -- 10:11 AM EDT     -1.88 knots Max Ebb
Sat -- 01:15 PM EDT     0.00 knots Slack
Sat -- 03:36 PM EDT     1.35 knots Max Flood
Sat -- 05:06 PM EDT     Moonrise
Sat -- 07:23 PM EDT     -0.00 knots Slack
Sat -- 07:53 PM EDT     Sunset
Sat -- 10:39 PM EDT     -2.13 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION

Charleston Harbor Entrance, South Carolina Current, knots

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