Thursday, October21, 2021
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Marine Weather and Tides
Tybee Island, GA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 7:30AMSunset 6:45PM Thursday October 21, 2021 6:03 PM EDT (22:03 UTC) Moonrise 6:32PMMoonset 7:20AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 304 Pm Edt Thu Oct 21 2021
Tonight..S winds 10 to 15 kt this evening, becoming sw. Seas 2 ft. A slight chance of showers after midnight.
Fri..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers in the morning, then a slight chance of showers and tstms in the afternoon.
Fri night..SW winds 10 to 15 kt, becoming W after midnight. Seas 2 ft. A slight chance of showers and tstms.
Sat..NW winds 5 to 10 kt. Seas 2 ft.
Sat night..NE winds 5 to 10 kt. Seas 2 ft.
Sun..E winds 10 kt. Seas 2 ft.
Sun night..SE winds 5 to 10 kt. Seas 2 ft.
Mon..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers.
Mon night..S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers.
Tue..W winds 10 kt. Seas 2 to 3 ft. A chance of showers.
Tue night..NW winds 10 kt. Seas 2 to 3 ft. A slight chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 304 Pm Edt Thu Oct 21 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will prevail through tonight. A weak cold front is forecast to move through late Friday. High pressure will then return for the weekend, potentially followed by two back-to-back disturbances next week.


7 Day Forecast for Marine Location Near Tybee Island, GA
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location: 32.03, -80.85     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 211935 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 335 PM EDT Thu Oct 21 2021

SYNOPSIS. Atlantic high pressure will prevail through tonight. A weak cold front is forecast to move through late Friday. High pressure will then return for the weekend, potentially followed by two back-to-back disturbances next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. A cold front well to the west near the MS Valley will steadily draw closer as a mild south/southwest flow continues ahead of it. A few showers will be possible late, mainly near the SC coast and possibly well inland near the CSRA. No significant rainfall is anticipated given the lack of strong forcing/deep moisture. Given some clouds and decent southerly flow temperatures should not drop much below the lower to mid 60s most areas and near 70 at the coast.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/. Friday: A broad mid-level trough over the eastern half of the US will push a weak cold front across the forecast area overnight. Model solutions keep a majority of the forecast area on the drier side; however, isolated showers are possible in the afternoon/early evening ahead of the front. As southwesterly flow advects Gulf moisture into the region, PWATs look to increase to near 1.5" for a brief period ahead of the front. Isolated, shallow showers look to advance eastward throughout the day, initially affecting the inland counties in the early afternoon and moving toward the coastal counties by late afternoon. Models suggest a slight increase in coverage, i.e., a poorly defined/broken line of isolated showers developing over the coastal areas, where the airmass collides with a pinned sea breeze. MLCAPE indicate modest instability, with values between 1000-1500 J/kg, thus an isolated thunderstorm is possible especially across the coastal communities where the greater instability lies. The forecast only features slight chance POPs due to the lack of coverage as well as the main limiting factor, which is the presence of dry mid/upper level air. Temperatures ahead of the front will be above normal due to southerly flow, primed to reach the low to mid 80s. Lows will dip into the 50s overnight across the majority of the CWA, whereas the beaches will remain slightly warmer in the low 60s.

Saturday and Sunday: Broad mid-level troughing over the East Coast will begin to lift, becoming replaced by quasi-zonal upper level flow. Surface high pressure is expected to build over the Southeast for the weekend. Mostly dry conditions are expected to return along with mostly sunny skies. Temperatures over the weekend will start off cooler Saturday, with highs in the upper 70s and lower 80s in locations south of I-16. Min temps will drop into low to mid 50s, with portions of the far inland counties dipping into the upper 40s. The beaches will remain warm overnight as temperatures remain in the low 60s. Sunday will feature a forecast that is a couple of degrees warmer as noted by increasing llvl thickness values.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. A potent shortwave over the Midwest will approach from the west which is expected to amplify/strengthen as it passes over the East Coast Monday night into Tuesday. A narrow ridge building to its west will push the shortwave off the coast Wednesday. The surface forecast from the WPC is for a storm system to pass to our north Monday into Tuesday; however the strength of the trough will dictate the impacts to our forecast area. The Euro favors a stronger system, however the GFS is weaker which would limit the deeper moisture and greatest rainfall to the north. Slight chance POPs are in place Monday afternoon into Tuesday night before clearing out by Wednesday morning. A stronger disturbance could then bring wetter conditions near the end of next week. Temperatures will start off the week well above normal and gradually decreasing throughout the week, yet still remaining slightly above normal.

AVIATION /19Z THURSDAY THROUGH TUESDAY/. VFR conditions will prevail at KCHS, KJZI, and KSAV through 18Z Friday. Very small risk of brief restrictions from showers/low clouds late in the period as a cold front approaches. Also, gusty winds 15-20 kt possible toward the end of the period, especially at KCHS and KJZI.

Extended Aviation Outlook: Flight restrictions are possible Friday late afternoon ahead of a cold front. Then, VFR conditions expected through early next week.

MARINE. Tonight: South to southwest flow will prevail ahead of an approaching cold front. Expect a bit of a wind surge given the increasing low level jet but no gusts higher than about 20 kt are expected. Seas will also rise a bit, highest (3 ft) beyond 10 nm off the Charleston County coast.

Friday through Tuesday: A weak cold front will approach from the west/northwest Friday, slightly increasing SW winds. The front is forecasted to move offshore overnight Friday, causing winds to veer to the NE by Saturday night. Gusts could reach 20 kt across portions of the waters just ahead of and behind the front, but no Small Craft Advisories are anticipated. High pressure will return this weekend, improving marine conditions. Despite the FROPA, seas will remain rather consistent through the period; averaging 3 ft or less. A storm system could then bring unsettled weather to the coastal waters Monday into Tuesday.

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



NEAR TERM . RJB SHORT TERM . BRM LONG TERM . BRM AVIATION . BRM/RJB MARINE . BRM/RJB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 3 mi45 min SSW 8G12 77°F 73°F1020 hPa
41033 29 mi55 min SSW 9.7G14 76°F 75°F1019.3 hPa
ACXS1 - ACE Basin Reserve, SC 42 mi78 min SSE 1.9 78°F 1021 hPa61°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi73 min S 9.7G12 77°F 78°F1 ft1019.6 hPa (-2.1)
SAXG1 - Sapelo Island Reserve, GA 48 mi63 min SSE 9.9 80°F 1020 hPa (-1.0)72°F

Wind History for Fort Pulaski, GA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilton Head Island, Hilton Head Airport, SC15 mi73 minS 810.00 miFair79°F64°F61%1020.3 hPa
Hunter U. S. Army Airfield, GA16 mi2.1 hrsS 810.00 miMostly Cloudy80°F64°F57%1019.2 hPa
Savannah-Hilton Head International Airport, GA20 mi70 minS 910.00 miMostly Cloudy78°F61°F56%1019.4 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)
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Last 24hrS50000000000000000SE5SW9S9
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1 day ago0000000000000000N5N5N5N5N5SE5S6S5
2 days ago0000000000000000------------E5E4

Tide / Current Tables for Tybee Light, Savannah River, Georgia
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Tybee Light
Click for Map
Thu -- 02:57 AM EDT     0.28 feet Low Tide
Thu -- 07:31 AM EDT     Sunrise
Thu -- 08:20 AM EDT     Moonset
Thu -- 08:58 AM EDT     7.99 feet High Tide
Thu -- 03:26 PM EDT     0.64 feet Low Tide
Thu -- 06:43 PM EDT     Sunset
Thu -- 07:31 PM EDT     Moonrise
Thu -- 09:21 PM EDT     7.26 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Savannah River Entrance, Georgia Current (2) (expired 1999-12-31)
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Savannah River Entrance
Click for Map
Thu -- 01:21 AM EDT     -2.52 knots Max Ebb
Thu -- 04:42 AM EDT     0.00 knots Slack
Thu -- 07:05 AM EDT     1.63 knots Max Flood
Thu -- 07:31 AM EDT     Sunrise
Thu -- 08:20 AM EDT     Moonset
Thu -- 10:19 AM EDT     -0.00 knots Slack
Thu -- 01:47 PM EDT     -2.61 knots Max Ebb
Thu -- 05:15 PM EDT     0.00 knots Slack
Thu -- 06:43 PM EDT     Sunset
Thu -- 07:26 PM EDT     1.37 knots Max Flood
Thu -- 07:31 PM EDT     Moonrise
Thu -- 10:27 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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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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