Tuesday, August21, 2018 L-36.com


Marine Weather and Tides
Tybee Island, GA

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Sunrise 6:51AMSunset 8:01PM Tuesday August 21, 2018 10:03 PM EDT (02:03 UTC) Moonrise 3:54PMMoonset 1:36AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 742 Pm Edt Tue Aug 21 2018
Tonight..SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Wed..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms in the afternoon.
Wed night..SW winds 10 to 15 kt with gusts to 20 kt, becoming W after midnight. Seas 3 to 4 ft, subsiding to 2 to 3 ft after midnight. A slight chance of showers and tstms in the evening.
Thu..NE winds 10 to 15 kt. Seas 2 ft. A slight chance of showers and tstms in the afternoon.
Thu night..NE winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight.
Fri..NE winds 10 to 15 kt. Seas 3 ft. A chance of showers and tstms.
Fri night..E winds 10 to 15 kt with gusts to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. A chance of showers and tstms.
Sat..E winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sat night..SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sun..E winds 5 to 10 kt. Seas 1 foot. A chance of showers and tstms.
Sun night..SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 742 Pm Edt Tue Aug 21 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will approach from the northwest tonight, then cross through on Wednesday before high pressure builds in from the northwest. Atlantic high pressure will rebuild 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 212359
afdchs
area forecast discussion
national weather service charleston sc
759 pm edt Tue aug 21 2018

Synopsis
A cold front will approach from the northwest tonight, then
cross through on Wednesday before high pressure builds in from
the northwest. Atlantic high pressure will rebuild early next
week.

Near term until 6 am Wednesday morning
Early this evening: convection has once again been hard to come
by this evening. One cluster of thunderstorms finally did
develop near the altamaha river and move northeastward across
fort stewart and now across northern chatham county. Despite
limited vertical depth, the storm has produced a persistent wind
signature, indicative of winds in the 30-40 mph range. Despite
a clear 500 mb trough axis upstream that is moving into the
area, forecast models show any ongoing convection dissipating
after sunset with little to no additional development later this
evening. Most of the moist convergence appears to be well
upstream of the area, so perhaps this minimal coverage forecast
is on the right track. Updated rain chances through the next few
hours based on radar trends, but no noteworthy changes for the
latter part of the tonight period.

Short term 6 am Wednesday morning through Friday
As shortwave upper ridging occurs to the west, a weak cold
front will push through the area on Wednesday. We expect to see
a considerable drop in pwats throughout the day, with values
dropping from 1.75" in the morning to 1.4" late afternoon. Given
the upper ridging, the resulting mid-level subsidence, along
with decreasing atmospheric moisture, will not create ideal
conditions for convective development. We only show slight
chance pops along the coast, and mainly during the afternoon,
where deeper moisture will linger and a mid-late afternoon sea
breeze will affect.

Thursday into Friday, an expanding upper ridge to the west will
allow drier, cooler high pressure at the surface to expand
southeast into the area. Southern sc will mainly see dry
conditions though a few coastal showers or tstms will be
possible each afternoon where the sea breeze develops. Somewhat
higher convective coverage will develop over southeast ga where
a bit more moisture will exist. High temps will only reach the
mid to upper 80s by Friday due to the cool advection.

Long term Friday night through Tuesday
Broad high pressure initially over the southern plains Friday
night will strengthen and expand across the southeast into
Monday. Meanwhile, a stationary front will remain offshore
during this time period, possibly dissipating on Monday. The
exact location of the front will determine the precipitation
potential. There is uncertainty, so we went with a model blend
for the forecast.

Aviation 00z Wednesday through Sunday
Vfr conditions are expected to prevail at kchs and ksav through
00z Thursday. A thunderstorm just recently passed by ksav and
no additional thunderstorms are expected. This activity could
make a run for kchs in a few hours, but the expectation is that
it will dissipate with time. Overnight, there is a chance for
MVFR ceilings to be just to the west of ksav. Will carry
scattered MVFR level clouds for a few hours around sunrise. Very
low chances for thunderstorms at both sites Wednesday
afternoon.

Extended aviation outlook: fairly low chances for convection at
either terminal through the period. The greatest chance will be
mid to late each afternoon.

Marine
Tonight: low-level surging between an inland trough and
offshore high pressure will result in winds generally SW 15 to
20 kts with seas ranging 2 to 4 feet. A small chance of showers
or thunderstorms as shortwave energy crosses over the coastal
waters, mainly late.

Sw flow on Wednesday will become NE by Thursday morning as a
wedge of high pressure builds in from the northwest. Late
Thursday through Friday we could see some gusts to 20 kt at
times, mainly over the sc waters. Winds in charleston harbor on
Friday could approach small craft advisory levels, particularly
in the afternoon when a sea breeze enhances the existing
northeast gradient flow. Gusts could approach 25 kt.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Bsh
short term... Jrl
long term... Ms
aviation... Bsh jrl
marine... Jmc jrl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 3 mi33 min WSW 5.1 G 8 79°F 85°F1017.6 hPa
41033 29 mi55 min SW 16 G 21 83°F 83°F1016.3 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi73 min SSW 14 G 18 82°F 83°F2 ft1017.2 hPa (+0.7)76°F
SAXG1 - Sapelo Island Reserve, GA 48 mi63 min SW 7 81°F 1017 hPa (+1.0)76°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 mi68 minSSW 910.00 miThunderstorm in Vicinity84°F77°F79%1016.9 hPa
Hunter U. S. Army Airfield, GA16 mi67 minSW 510.00 miFair78°F72°F83%1016.5 hPa
Savannah-Hilton Head International Airport, GA20 mi70 minSW 610.00 miOvercast78°F73°F87%1017 hPa

Wind History from HXD (wind in knots)
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Tide / Current Tables for Tybee Light, Savannah River, Georgia
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Tybee Light
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Tue -- 02:36 AM EDT     Moonset
Tue -- 04:37 AM EDT     6.19 feet High Tide
Tue -- 06:51 AM EDT     Sunrise
Tue -- 10:59 AM EDT     0.85 feet Low Tide
Tue -- 04:53 PM EDT     Moonrise
Tue -- 05:21 PM EDT     7.03 feet High Tide
Tue -- 08:00 PM EDT     Sunset
Tue -- 11:49 PM EDT     1.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.52.63.95.266.15.64.63.42.21.20.91.22.33.75.26.476.96.25.13.82.41.3

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Tue -- 12:05 AM EDT     0.00 knots Slack
Tue -- 02:30 AM EDT     1.61 knots Max Flood
Tue -- 02:36 AM EDT     Moonset
Tue -- 05:57 AM EDT     -0.00 knots Slack
Tue -- 06:51 AM EDT     Sunrise
Tue -- 09:44 AM EDT     -1.63 knots Max Ebb
Tue -- 12:10 PM EDT     0.00 knots Slack
Tue -- 02:57 PM EDT     1.86 knots Max Flood
Tue -- 04:53 PM EDT     Moonrise
Tue -- 06:46 PM EDT     -0.00 knots Slack
Tue -- 08:00 PM EDT     Sunset
Tue -- 10:27 PM EDT     -2.00 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.111.61.61.30.8-0-0.9-1.3-1.6-1.6-1.2-0.20.91.71.91.71.40.8-0.2-1-1.6-1.9-1.9

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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (22,6,7,8)
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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.