Wednesday, April21, 2021
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Marine Weather and Tides
Meggett, SC

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:41AMSunset 7:55PM Wednesday April 21, 2021 10:11 PM EDT (02:11 UTC) Moonrise 1:02PMMoonset 2:29AM Illumination 76% Phase: Waxing Gibbous; Moon at 10 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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AMZ330 Charleston Harbor- 812 Pm Edt Wed Apr 21 2021
.small craft advisory in effect until 8 am edt Thursday...
Tonight..NW winds 20 to 25 kt with gusts to 30 kt, becoming N after midnight. Waves 1 to 2 ft.
Thu..N winds 10 to 15 kt with gusts to 20 kt, becoming W 5 to 10 kt in the afternoon.
Thu night..SW winds 5 to 10 kt.
Fri..NE winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon.
Fri night..S winds 10 to 15 kt. A chance of showers after midnight.
Sat..SE winds 15 to 20 kt, becoming S 20 to 25 kt in the afternoon. Waves 2 to 3 ft. Showers likely with a slight chance of tstms in the morning, then showers with a chance of tstms in the afternoon.
Sat night..SW winds 20 to 25 kt, becoming W 15 to 20 kt after midnight. Waves 2 to 3 ft. A chance of tstms. Showers.
Sun..NW winds 10 to 15 kt.
Sun night..N winds 5 to 10 kt.
Mon..NE winds 10 kt.
Mon night..SE winds 5 to 10 kt. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 69 degrees.
AMZ300 812 Pm Edt Wed Apr 21 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. After a cold front passes through today, high pressure will prevail before a storm system impacts the region late week. High pressure will then return early next week.


7 Day Forecast for Marine Location Near Meggett, SC
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location: 32.7, -80.28     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 220018 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 818 PM EDT Wed Apr 21 2021

SYNOPSIS. After a cold front passes through today, high pressure will prevail before a storm system impacts the region late week. High pressure will then return early next week.

NEAR TERM /UNTIL 6 AM THURSDAY MORNING/. Early this evening: Surface analysis shows that the cold front is situated right across the forecast area. The front will shift offshore in the next hour or two and winds will start to turn a bit more northwesterly with time. Models then show a sort of backdoor surface trough that drops through late this evening which will help turn winds northwest and then north-northwest. As this surface trough passes through we should also see a nice surge of low level flow and a persistence of breezy winds into the early morning hours. Then late tonight, the gradient will diminish and winds will lose the gusts, but remain elevated. Much cooler air will filter in through the night, resulting in quite unseasonably cool temperatures Thursday morning. Forecast lows range from the upper 30s inland to the mid/upper 40s as you get closer to the coast.

Lake Winds: Winds are currently gusting to around 20 knots at Pinopolis this evening, and we should see a surge of northwest winds through the evening, with frequent gusts into the 25-30 knot range. A Lake Wind Advisory remains in effect.

SHORT TERM /6 AM THURSDAY MORNING THROUGH SATURDAY/. Moderate to high confidence through the period. The lowest confidence is regarding the severe storm threat Saturday.

Thursday/Friday: High pressure will prevail with dry conditions and moderating temperatures, although still below normal.

Friday night: Moisture and upper forcing will begin to increase ahead of a developing storm system to the west and could see some showers late along a developing warm front, especially inland.

Saturday: This will be the most impactful period as a storm system impacts the area. Confidence is high on some much needed rainfall given the deep moisture and strong upper forcing, with possibly over an inch in spots. The biggest question, as usual, will be the amount of instability available to produce severe storms, with the deep layer shear plenty high enough to support organized convection. Through the morning it appears as though the most rainfall will set up inland toward the CSRA/Midlands along/near a warm front. Instability should be pretty weak during this period and thus the threat of thunderstorms will be low. However, enough instability could build later in the afternoon, especially in GA where temperatures should be warmest, and this is when the greater risk of thunderstorms and severe storm potential are expected. Damaging winds, large hail and even tornadoes all look possible. Even outside any stronger storms winds will likely be pretty gusty and a Lake Wind Advisory for Lake Moultrie could be needed at the very least.

LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/. Models are in good agreement in the long term period. High pressure will build into the region on Sunday behind a departing low pressure system and will remain the primary feature through at least Wednesday. No significant forecast concerns are expected with dry conditions and plenty of sunshine. Temperatures will be near to above normal, likely peaking late in the period.

AVIATION /00Z THURSDAY THROUGH MONDAY/. VFR conditions will prevail through 00z Friday. Winds will continue to gust to around 20 knots through the evening.

Extended Aviation Outlook: Flight restrictions will be possible Saturday as a storm system impacts the area. Thunderstorms are also possible. Gusty winds are also expected Saturday even outside of any thunderstorms.

MARINE. Tonight: Near term models indicated that the cold front will push offshore early this evening, followed by a backdoor sfc trough. It is possible that 3 hr pressure falls will range between 3 to 5 mbs this evening. NNW winds should strengthen this evening in the wake of the front across all the marine zones, however, portions of the Charleston County waters (AMZ350) could approach gales. NNW winds this evening should generally range between 15 to 20 kts with gusts around 30 kts. Winds are expected to shift from the north late tonight with gradually decreasing speeds. Seas are forecast to range between 3 to 5 ft, some 6 ft conditions possible across the outer portions of AMZ374. Small Craft Advisories will remain in effect until 8 AM Thursday.

Thursday through Monday: Moderate to high confidence this period. Expect improving conditions Thursday as high pressure builds in and allows for a diminishing pressure gradient. Conditions should reach Small Craft Advisory thresholds late week due to a passing cold front. There is even a small risk for some gale force gusts, even outside of any stronger storms later Saturday into Saturday night.

FIRE WEATHER. For Thursday, relative humidity values are expected to fall into the 20-25 percent range everywhere except the immediate Georgia coastline. Also, winds will be considerably weaker and less gusty. We have coordinated a Fire Danger Statement with our fire weather partners for most of the area away from the GA coast for Thursday. Relative humidity values will again be low on Friday, falling into the 25-30 percent range for much of the area.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . Lake Wind Advisory until 5 AM EDT Thursday for SCZ045. MARINE . Small Craft Advisory until 8 AM EDT Thursday for AMZ330-350- 352-354-374.



NEAR TERM . BSH SHORT TERM . RJB LONG TERM . RJB AVIATION . BSH/RJB MARINE . NED/RJB FIRE WEATHER .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 13 mi86 min WNW 2.9 71°F 1013 hPa46°F
CHTS1 20 mi53 min WNW 8 G 15 72°F 69°F1013.2 hPa
FBIS1 - Folly Island, SC 21 mi71 min W 6 G 9.9 71°F 1012.9 hPa (+2.7)
41033 30 mi63 min WNW 16 G 19 72°F 68°F1012.4 hPa
41029 - Capers Nearshore (CAP 2) 35 mi33 min WNW 19 G 27 71°F 68°F1012.2 hPa
FPKG1 - 8670870 - Fort Pulaski, GA 57 mi53 min 68°F1014.6 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC15 mi76 minW 129.00 miFair72°F45°F38%1012.5 hPa
Charleston, Charleston Air Force Base, SC20 mi75 minWNW 14 G 2010.00 miFair70°F40°F34%1012.5 hPa
Walterboro Lowcountry Regional Airport, SC24 mi76 minWNW 10 G 1610.00 miFair66°F25°F21%1014.2 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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1 day agoCalmN3NE4NE6CalmE8E6E3E8E4E5E6E9E11E11E8
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Tide / Current Tables for Lower Toogoodoo Creek, 2 mi. above entrance, South Carolina
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Lower Toogoodoo Creek
Click for Map
Wed -- 03:29 AM EDT     Moonset
Wed -- 04:42 AM EDT     6.70 feet High Tide
Wed -- 06:44 AM EDT     Sunrise
Wed -- 10:40 AM EDT     1.20 feet Low Tide
Wed -- 02:02 PM EDT     Moonrise
Wed -- 05:20 PM EDT     5.87 feet High Tide
Wed -- 07:55 PM EDT     Sunset
Wed -- 10:58 PM EDT     0.96 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.53.85.166.66.76.14.93.42.21.41.21.72.73.84.85.55.85.74.93.72.41.41

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 12:19 AM EDT     1.31 knots Max Flood
Wed -- 03:27 AM EDT     Moonset
Wed -- 03:46 AM EDT     -0.00 knots Slack
Wed -- 06:42 AM EDT     Sunrise
Wed -- 07:19 AM EDT     -1.75 knots Max Ebb
Wed -- 10:37 AM EDT     0.00 knots Slack
Wed -- 12:52 PM EDT     1.14 knots Max Flood
Wed -- 02:00 PM EDT     Moonrise
Wed -- 04:15 PM EDT     -0.00 knots Slack
Wed -- 07:43 PM EDT     -1.62 knots Max Ebb
Wed -- 07:54 PM EDT     Sunset
Wed -- 10:43 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.20.80.4-0.1-0.9-1.4-1.7-1.6-1.1-0.40.30.91.10.90.50.1-0.5-1.1-1.5-1.6-1.2-0.50.2

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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