Wednesday, December12, 2018 L-36.com


Marine Weather and Tides
Tybee Island, GA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:14AMSunset 5:21PM Wednesday December 12, 2018 6:31 AM EST (11:31 UTC) Moonrise 11:14AMMoonset 10:10PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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- 542 Am Est Wed Dec 12 2018
Today..W winds 5 to 10 kt. Seas 2 to 3 ft.
Tonight..SW winds 5 to 10 kt, becoming W after midnight. Seas 2 ft.
Thu..NE winds 5 kt, becoming E in the afternoon. Seas 1 to 2 ft. A slight chance of showers in the afternoon.
Thu night..SE winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft, building to 4 to 5 ft after midnight. A chance of showers in the evening, then showers likely after midnight.
Fri..S winds 15 to 20 kt. Seas 4 to 6 ft, building to 5 to 7 ft in the afternoon. Showers with a slight chance of tstms.
Fri night..SW winds 15 kt with gusts to 20 kt. Seas 5 to 7 ft. Showers with a slight chance of tstms in the evening, then showers likely after midnight.
Sat..W winds 15 kt. Seas 4 to 6 ft. A chance of showers.
Sat night..W winds 15 kt. Seas 3 to 4 ft. A slight chance of showers.
Sun..NW winds 10 to 15 kt. Seas 3 to 4 ft.
Sun night..NW winds 10 to 15 kt. Seas 2 to 3 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 542 Am Est Wed Dec 12 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through Thursday. A storm system will affect the area Thursday night into Saturday. High pressure will then return early next week.


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


Area Discussion for - Charleston, SC
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Fxus62 kchs 121107
afdchs
area forecast discussion
national weather service charleston sc
607 am est Wed dec 12 2018

Synopsis
High pressure will prevail through Thursday. A storm system
will affect the area Thursday night into Saturday. High
pressure will then return early next week.

Near term through tonight
As of 6 am: the current forecast appears on track. Latest ir
satellite shows thin high clouds just upstream of the forecast
area. High clouds should increase across the region through the
rest of the day. The forecast will feature a gradual increase in
sky cover, remaining mostly to partly sunny. I will increase
high temperatures by 1 degree, following the trend in the latest
mos.

As of 320 am: the center of sfc high pressure will move from
the fl panhandle early this morning to off the ga sc coast this
evening. Sfc winds are forecast to shift from wnw this morning
to SW by late this afternoon. Given mostly sunny conditions and
light return flow, high temperatures should range from near 60
across the lower altamaha river area to the mid 50s across the
chs tri-county. Tonight, sfc high pressure is expected to ridge
west across the forecast area, resulting in light to calm winds
late tonight. The combination of mostly clear conditions, light
to calm winds, and dewpoint depressions around 5 degrees should
provide several hours of radiational cooling conditions. Using a
blend of mos, I will forecast low temperatures generally in the
mid to upper 30s.

Short term Thursday through Saturday
Surface high pressure will shift into the northeast on Thursday
as a closed upper low digs into central texas. Weak shortwave
energy approaching the area late in the day is expected to
induce a weak coastal trough off the ga coast. Weak convergence
could produce a few showers across coastal southeast ga late in
the day. Otherwise, dry and relatively warm temperatures are
anticipated with highs reaching the lower 60s.

The upper low will slowly but steadily move east-northeast Thursday
night through Saturday (the guidance has trended slower with the
upper low progression). A southerly 30-40 kt 0-6 km flow will
advect another unseasonably moist airmass into the region with
pwats in excess of 1.5" on Friday. Meanwhile, a large area of
upper jet divergence will overspread the area Thursday night and
Friday as a plethora of shortwaves lift through the area. A cold
front is forecast to cross the area late Friday night. We
anticipate widespread showers Thursday night through at least
Friday evening. A few thunderstorms are also possible, mainly
Friday into Friday evening as some weak instability develops.

Given the rich moisture profile and strong forcing with this
event, we are showing a widespread 2-3" of rain.

Although the strongest forcing will be east of the area by
Saturday, wrap around moisture associated with the departing
surface low could produce a few showers.

Long term Saturday night through Tuesday
There's a chance that some showers could linger into Saturday
night or Sunday if the ecmwf's slower and more southerly upper
low track verifies. Otherwise, dry weather with near-normal
temperatures will prevail under deep layered ridging.

Aviation 11z Wednesday through Sunday
Vfr at kchs ksav through 12z Thursday.

Extended aviation outlook: MVFR or ifr conditions are likely at
chs sav terminals Thursday night into Saturday morning as low
pressure moves through, accompanied by widespread showers and a
few thunderstorms.

Marine
Today and tonight: sfc high pressure will remain across the marine
zone through the period. This morning the pressure gradient is
forecast to range around 1-2 mbs, decreasing to around 1 mb this
evening and tonight. Winds should begin the day wnw around 10 kts,
shifting from the SW this afternoon and decreasing to 5-10 kts.

Winds should favor values less than 5 kts tonight. Seas will begin
today between 1-4 ft then decreasing through the rest of today. By
late tonight, seas should settle between 1-2 ft.

Small craft advisories will become likely by late Thursday night
as southeast winds strengthen and seas build ahead of a low
pressure system. SCA conditions will then occur through at least
Saturday, perhaps into Saturday night due to lingering 6+ ft
seas.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Ned
short term... Jrl
long term... Jrl
aviation... Jrl ned
marine... Jrl ned


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 3 mi37 min W 6 G 8.9 39°F 51°F1025.2 hPa
41033 29 mi83 min WNW 14 G 19 46°F 55°F1024 hPa
ACXS1 - ACE Basin Reserve, SC 42 mi46 min Calm 37°F 1024 hPa33°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi41 min NW 14 G 16 49°F 59°F3 ft1024.9 hPa (+0.0)37°F
SAXG1 - Sapelo Island Reserve, GA 48 mi31 min NW 5.1 40°F 1025 hPa (+0.0)36°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilton Head Island, Hilton Head Airport, SC15 mi56 minS 510.00 miFair39°F32°F75%1024.7 hPa
Hunter U. S. Army Airfield, GA16 mi35 minWSW 410.00 miFair32°F28°F87%1024.7 hPa
Savannah-Hilton Head International Airport, GA20 mi38 minW 310.00 miFair33°F32°F96%1025 hPa

Wind History from HXD (wind in knots)
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Last 24hrW8SW5SW5SW5W6NW6
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W7W7S3CalmS4S3S4S4SE5S6SE4S4S545
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W6NW11NW8NW8NW8NW8W7W5NW4CalmS4S4S3CalmCalm353NW964
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Tide / Current Tables for Tybee Light, Savannah River, Georgia
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Tybee Light
Click for Map
Wed -- 04:37 AM EST     0.70 feet Low Tide
Wed -- 07:14 AM EST     Sunrise
Wed -- 11:04 AM EST     6.74 feet High Tide
Wed -- 11:14 AM EST     Moonrise
Wed -- 05:19 PM EST     Sunset
Wed -- 05:20 PM EST     0.76 feet Low Tide
Wed -- 10:10 PM EST     Moonset
Wed -- 11:25 PM EST     5.95 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.54.431.70.90.81.52.94.35.66.46.76.55.64.32.81.50.811.93.24.45.45.9

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Wed -- 12:09 AM EST     -0.00 knots Slack
Wed -- 02:44 AM EST     -1.43 knots Max Ebb
Wed -- 06:08 AM EST     0.00 knots Slack
Wed -- 07:14 AM EST     Sunrise
Wed -- 08:42 AM EST     1.69 knots Max Flood
Wed -- 11:14 AM EST     Moonrise
Wed -- 12:35 PM EST     -0.00 knots Slack
Wed -- 03:40 PM EST     -1.67 knots Max Ebb
Wed -- 05:19 PM EST     Sunset
Wed -- 06:50 PM EST     0.00 knots Slack
Wed -- 09:14 PM EST     1.67 knots Max Flood
Wed -- 10:10 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-0.7-1.3-1.4-1.3-0.9-0.10.81.51.71.30.90.4-0.4-1.2-1.6-1.7-1.5-0.90.21.21.71.51.1

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Southeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (6,6,7,8)
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Ground Weather Radar Station Charleston, SC
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.