Wednesday, October17, 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 7:28AMSunset 6:49PM Wednesday October 17, 2018 5:09 AM EDT (09:09 UTC) Moonrise 2:01PMMoonset 12:00AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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- 338 Am Edt Wed Oct 17 2018
.small craft advisory in effect from late tonight through Thursday evening...
Today..SW winds 15 kt early, diminishing to 5 to 10 kt this afternoon. Seas 2 to 3 ft. A slight chance of tstms. A slight chance of showers.
Tonight..N winds 5 to 10 kt, becoming ne 15 to 20 kt with gusts to 25 kt after midnight. Seas 2 ft, building to 3 to 5 ft after midnight. A slight chance of tstms in the evening. A slight chance of showers.
Thu..NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 4 to 6 ft.
Thu night..NE winds 15 to 20 kt. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight.
Fri..NE winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon.
Fri night..E winds 5 to 10 kt, becoming S after midnight. Seas 3 to 4 ft.
Sat..SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers with a slight chance of tstms.
Sat night..NW winds 15 to 20 kt. Seas 3 to 4 ft. A chance of showers.
Sun..N winds 15 to 20 kt. Seas 3 to 4 ft.
Sun night..NE winds 15 kt. Seas 3 to 4 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 338 Am Edt Wed Oct 17 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will cross the region today then move south of the area tonight. Cooler high pressure will then move in through late week before a stronger cold front pushes through Saturday night.


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 170830
afdchs
area forecast discussion
national weather service charleston sc
430 am edt Wed oct 17 2018

Synopsis
A cold front will cross the region today then move south of the
area tonight. Cooler high pressure will then move in through
late week before a stronger cold front pushes through Saturday
night.

Near term through tonight
Pre-dawn: isolated to locally scattered convective rains
extended across southeast ga and the coastal carolinas in a
region of enhanced deeper moisture. Layered clouds have
increased in coverage since midnight with pockets of stratus
around the region. Patchy fog is possible inland, however the
layered clouds and 15-20 kt southwest low level jet will likely
keep fog from becoming a significant issue around daybreak. A
few spots where it rained overnight inland ga and adjacent to
the csra stand the best chance for some locally reduced vsbys. A
very mild morning once again, most areas in the mid 70s at
sunrise.

Today: the cold front across the mountains at daybreak is
forecast to make a gradual push into the forecast area today
while low level winds veer more west and northwest across the
forecast region. Deep layered moisture remains in excess of 1.75
inches throughout the day, however the wnw boundary layer flow
and lack of moisture convergence in the frontal trough remain
weak, suggestive of lower-end 20-30 pops in most areas. Models
hinting at mid levels that barely support deep convection and
while a few tstms may develop ahead of the cold front, the
atmosphere does not look supportive of any significant updrafts
or strong tstms. High temps look very warm again today with
some lower 90s likely in southeast ga and perhaps a few 90
degree readings may occur into southern sc if more afternoon
insolation develops.

Tonight: the cold front will push south of the region overnight
with cooler high pressure building from the northwest. Low level
winds will shift northeast and increase from north to south as
the gradient tightens by daybreak on Thursday. It will be mainly
dry with a few evening showers coastal and southern zones
moving south of the altamaha area late. Low temps are a bit
tricky as temps will be mild in the evening hours with readings
falling late and lows will be close to 12z Thursday many areas.

Short term Thursday through Saturday
Cooler and dry high pressure is expected Thursday and Friday behind
the cold front. Below normal temperatures Thursday are likely to
moderate to near-normal values Friday as flow turns more onshore
with the center of the surface high sliding off the coast, then
warming to a couple of degrees above normal Saturday given pre-
frontal compression in advance of the next arriving cold front.

Chance pops remain reasonable for Saturday given the supportive
environment in advance of the front, with pops declining after
frontal passage, which should occur later Saturday night.

Long term Saturday night through Tuesday
Below-normal temperatures look reasonable late weekend into early
next week behind the cold front. Model divergence increases late in
the weekend concerning the proximity of weak mid and upper level
ridging, and 17 00z runs of both the GFS and ECMWF suggest weak
coastal troughing attempts to develop near the southeast sc and ga
coasts next Tuesday. These factors decrease forecast confidence
heading into next week.

Aviation 08z Wednesday through Sunday
Ifr CIGS had developed at ksav and they may tend to hang on
until mid morning. We may need to amend kchs for showers and
scattered ifr CIGS if the batch of showers to the west continues
to expand prior to daybreak.VFR conditions will prevail from
late morning through 12z Thursday.

Extended aviation outlook:VFR conditions are expected to prevail at
both terminals. Low stratus cover and or ground fog during morning
hours will be possible. Additionally, brief flight restrictions will
be possible due to reduced ceilings and or vsbys under showers as a
cold front approaches and crosses the region Saturday.

Marine
Today: a nocturnal southwest surge will ebb after sunrise with
wind speeds becoming light in the frontal trough during the late
morning and early afternoon hours. Winds should shift north
across charleston waters late in the day with ga waters perhaps
becoming variable in the late afternoon and early evening hours
as a weak sea breeze develop.

Tonight: significant changes will occur as northeast winds
increase and strengthen in the wake of the cold front passage.

Building thermal and moisture gradients support surging
potential with 1000 mb geostrophic flow increasing to 30 kt
late. We hoisted small craft advisories in the sc waters from
06z and ga waters from 09z as speeds and gust potential increase
and seas build quickly from north to south nearing daybreak.

Winds will then veer northeast early Thursday behind a cold front
and rapid pressure rises will lead to building winds and seas. Small
craft advisories have been raised for all coastal waters beginning
prior to sunrise Thursday, and gusts within the charleston harbor
could approach advisory criteria for a brief period Thursday morning
as well. Conditions are expected to gradually improve through the
day Friday. Winds and seas could increase again Sunday as another
cold front crosses the region.

Climate
Record maximum temperatures will be challenged today. Both savannah
and charleston's record high is 91 degrees. The best potential
appears to be at savannah this afternoon.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory from 2 am to 11 pm edt Thursday for
amz350-352.

Small craft advisory from 5 am Thursday to 4 pm edt Friday for
amz374.

Small craft advisory from 5 am Thursday to 5 am edt Friday for
amz354.

Near term...

short term... Jmc
long term... Jmc
aviation... Jmc
marine... Jmc
climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 3 mi39 min SW 5.1 G 7 79°F 80°F1019.2 hPa
41033 29 mi61 min Calm G 0
ACXS1 - ACE Basin Reserve, SC 42 mi84 min Calm 78°F 1018 hPa77°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi79 min S 14 G 18 81°F 82°F3 ft1018.8 hPa (-0.3)76°F
SAXG1 - Sapelo Island Reserve, GA 48 mi69 min SW 7 78°F 1019 hPa (+0.0)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 mi14 minSSW 6 G 1210.00 miMostly Cloudy79°F77°F94%1019.3 hPa
Hunter U. S. Army Airfield, GA16 mi13 minSW 910.00 miOvercast77°F74°F93%1018.5 hPa
Savannah-Hilton Head International Airport, GA20 mi16 minSW 1010.00 miOvercast77°F75°F96%1019.1 hPa

Wind History from HXD (wind in knots)
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Last 24hrS3S4S4SW5SW5SW6W7W4S4S6S8S10S7S7S5S5S6S8S8S8S7S7S7
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1 day ago4SE3SE3SE5SE5SE6S4SE5SE5SE4SE4SW5S4CalmS4S4CalmCalmS4SE5CalmCalmCalmS3
2 days agoCalmN5N5N5N5N5NE5NE8E6NE8E5SE5E5E5E4CalmCalmCalmCalmSE3SE5
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Tide / Current Tables for Tybee Light, Savannah River, Georgia
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Tybee Light
Click for Map
Wed -- 12:50 AM EDT     Moonset
Wed -- 02:36 AM EDT     6.25 feet High Tide
Wed -- 07:28 AM EDT     Sunrise
Wed -- 08:35 AM EDT     1.74 feet Low Tide
Wed -- 03:01 PM EDT     Moonrise
Wed -- 03:10 PM EDT     6.81 feet High Tide
Wed -- 06:48 PM EDT     Sunset
Wed -- 09:34 PM EDT     1.72 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.45.46.16.25.64.63.42.51.81.82.33.24.35.46.46.86.65.84.73.52.51.81.82.3

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Wed -- 12:22 AM EDT     1.51 knots Max Flood
Wed -- 12:50 AM EDT     Moonset
Wed -- 03:55 AM EDT     -0.00 knots Slack
Wed -- 06:33 AM EDT     -1.32 knots Max Ebb
Wed -- 07:28 AM EDT     Sunrise
Wed -- 10:07 AM EDT     0.00 knots Slack
Wed -- 12:47 PM EDT     1.56 knots Max Flood
Wed -- 03:01 PM EDT     Moonrise
Wed -- 04:35 PM EDT     -0.00 knots Slack
Wed -- 06:48 PM EDT     Sunset
Wed -- 08:19 PM EDT     -1.59 knots Max Ebb
Wed -- 10:50 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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1.51.41.10.7-0.1-0.9-1.3-1.3-1.2-0.9-0.10.81.41.61.41.10.5-0.4-1.1-1.4-1.6-1.5-0.90.2

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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Wind Forecast for Charleston, SC (5,6,7,8)
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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.