Wednesday, June20, 2018 L-36.com


Marine Weather and Tides
Wilmington Island, GA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 6:16AMSunset 8:34PM Wednesday June 20, 2018 3:01 PM EDT (19:01 UTC) Moonrise 12:39PMMoonset 12:35AM Illumination 49% Phase: First Quarter Moon; Moon at 7 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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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 147 Pm Edt Wed Jun 20 2018
This afternoon..S winds 10 to 15 kt. Seas 2 to 3 ft.
Tonight..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms after midnight.
Thu..SW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 ft. A slight chance of showers and tstms in the morning.
Thu night..SW winds 10 to 15 kt. Seas 2 ft. A slight chance of showers and tstms after midnight.
Fri..W winds 5 to 10 kt, becoming sw 10 to 15 kt in the afternoon. Seas 2 ft. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Fri night..SW winds 10 to 15 kt. Seas 2 ft. A chance of showers and tstms.
Sat..SW winds 10 kt. Seas 2 ft. A chance of showers and tstms.
Sat night..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sun..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sun night..S winds 10 to 15 kt. Seas 2 ft. A slight chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 147 Pm Edt Wed Jun 20 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. The region will remain situated between atlantic high pressure and an inland trough of low pressure until later this week. The trough of low pressure will then settle over the region and will persist into early next week. A cold front could push into the region by the middle of next week.

7 Day Forecast for Marine Location Near Wilmington Island, GA
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location: 32, -81     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 201758
afdchs
area forecast discussion
national weather service charleston sc
158 pm edt Wed jun 20 2018

Synopsis
The region will remain situated between atlantic high pressure
and an inland trough of low pressure until later this week. The
trough of low pressure will then settle over the region and
will persist into early next week. A cold front could push into
the region by the middle of next week.

Near term through tonight
2 pm: radar and satellite imagery shows convection developing
across the area, along differential heating boundaries now and
later along the sea breeze. Cams have a decent amount of
convection over the next few hours, with the highest coverage
generally across the charleston tri-county area. Spc
mesoanalysis indicates mlcapes approaching 3,000 j kg in this
area, along with steep low level lapse rates. With dcapes
approaching 900 j kg, the main threat would be damaging wind
gusts from the strongest storms.

Temperatures and dew points remain on track, so no changes were
made with the heat advisories. Though, if the convection really
cools things down they may need to be expired early.

Tonight: any lingering evening convection should diminish in
the 01z-03z time frame and another warm and muggy ahead with
low temps Thursday similar to Wednesday morning.

Short term Thursday through Saturday
The strong upper ridge will hold strong on Thursday, with hot
weather continuing. Mid-level subsidence will limit overall
coverage of diurnal convection so we capped pops in most areas
at slight chance. Dewpoints away from the coastal corridor are
expected to mix out during the afternoon, though values in the
low to mid 70s in coastal zones could necessitate another heat
advisory for 105-107f heat index values.

Friday the upper ridge weakens and a shortwave pushes into the
area during the mid to late afternoon. Better low-level
instability and weaker upper subsidence supports greater
coverage of showers and tstms, especially in the afternoon.

Temperatures will not be quite as hot, though low to mid 90s are
still expected. A heat advisory cannot be ruled out, especially
in coastal sc where the sea breeze could increase dewpoints.

Saturday could be a degree cooler than Friday but lower 90s are
still expected across the area. Upper levels will remain
somewhat more conducive to convective development though no
significant shortwaves are anticipated. The main forcing will be
an inland trough and the afternoon sea breeze. Current heat
indices are forecast just below 105f.

Long term Saturday night through Wednesday
The upper ridge will temporarily rebuild over the southeast on
Sunday, causing temperatures to rise back into the middle 90s,
reducing convective coverage, and potentially requiring heat
advisories. A substantial upper vort MAX is forecast to drop
southeast into the area Monday, pushing a weak back door cold
front through the area Monday night or Tuesday. There is
increasing model agreement that temps will be a couple degrees
cooler next Tuesday and Wednesday.

Aviation 18z Wednesday through Monday
18z tafs: mainlyVFR. Showers and thunderstorms are developing
across the area. For now, we have vcts mentioned in at least one
of the tafs until 00z. Amendments will be made if direct impacts
seem likely, which would probably entail visibility reductions
and gusty winds. Conditions will improve late this evening as
the convection decreases.

Extended aviation outlook: mainlyVFR outside any thunderstorms.

Marine
South to southwest flow will increase later today and into the
early part of the overnight in response to diurnal enhancements
of the mixed layer environment along the land sea interface and
adjacent waters. Speeds should top out in the 15-20 kt range
with seas 2 to 4 ft through tonight.

A persistent summertime pattern will dominate the marine
environment Thursday through Monday as atlantic high pressure
remains to the east and a lee trough exists inland. SW flow will
generally prevail, with winds turning a bit more southerly and
increasing along the coast each afternoon as a result of the sea
breeze.

Chs watches warnings advisories
Ga... Heat advisory until 7 pm edt this evening for gaz087-088-
099>101-114>119-137>141.

Sc... Heat advisory until 7 pm edt this evening for scz040-042>045-
047>052.

Marine... None.

Near term...

short term...

long term... Jrl
aviation...

marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 6 mi44 min S 8 G 12 87°F 83°F1012.4 hPa
41033 37 mi54 min S 12 G 16 82°F 83°F1011.9 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 42 mi72 min SSW 9.7 G 12 82°F 83°F2 ft1012.4 hPa (-0.8)
SAXG1 - Sapelo Island Reserve, GA 43 mi62 min SE 9.9 91°F 1012 hPa (-1.0)80°F
ACXS1 - ACE Basin Reserve, SC 48 mi77 min SSE 1.9 92°F 1012 hPa81°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA8 mi66 minSSE 610.00 miPartly Cloudy93°F78°F63%1011.4 hPa
Savannah-Hilton Head International Airport, GA14 mi69 minno data10.00 miPartly Cloudy95°F75°F53%1011.6 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi72 minS 910.00 miClear88°F78°F75%1012.5 hPa

Wind History from SVN (wind in knots)
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Last 24hrS9SE11SE9S8S9S9
G15
S6S7S5SW5S5CalmCalmCalmCalmCalmW4CalmCalmCalmSW3CalmS6SE6
1 day agoSE7SE8SE9SE10SE7S7S5S4CalmS3S3S3CalmS3SW3CalmCalmSW5SW6CalmCalmS4SW4S4
2 days agoSE4CalmSE5SW9W4CalmCalmCalmCalmW3CalmW5CalmCalmCalm--------SW3W3CalmS4SE8

Tide / Current Tables for Savannah Sheraton Resort Hotel, Wilmington River, Georgia
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Savannah Sheraton Resort Hotel
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Wed -- 01:34 AM EDT     Moonset
Wed -- 02:31 AM EDT     8.40 feet High Tide
Wed -- 06:18 AM EDT     Sunrise
Wed -- 06:52 AM EDT     First Quarter
Wed -- 08:46 AM EDT     -0.19 feet Low Tide
Wed -- 01:39 PM EDT     Moonrise
Wed -- 03:17 PM EDT     8.10 feet High Tide
Wed -- 08:32 PM EDT     Sunset
Wed -- 09:19 PM EDT     0.36 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.67.38.38.37.35.63.51.50.2-0.20.62.13.95.87.38.17.86.75.13.11.40.40.61.7

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Wed -- 01:34 AM EDT     Moonset
Wed -- 03:25 AM EDT     -0.00 knots Slack
Wed -- 06:17 AM EDT     Sunrise
Wed -- 06:44 AM EDT     -2.28 knots Max Ebb
Wed -- 06:52 AM EDT     First Quarter
Wed -- 09:35 AM EDT     0.01 knots Slack
Wed -- 12:21 PM EDT     2.14 knots Max Flood
Wed -- 01:38 PM EDT     Moonrise
Wed -- 04:04 PM EDT     -0.00 knots Slack
Wed -- 07:31 PM EDT     -2.28 knots Max Ebb
Wed -- 08:32 PM EDT     Sunset
Wed -- 10:10 PM EDT     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.221.50.5-0.7-1.7-2.2-2.3-1.9-0.80.61.62.12.11.81.20.1-1.1-1.8-2.2-2.2-1.5-0.31.1

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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (15,3,4,5)
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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.