Monday, August20, 2018 L-36.com


Marine Weather and Tides
Wilmington Island, GA

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Sunrise 6:51AMSunset 8:03PM Monday August 20, 2018 3:00 AM EDT (07:00 UTC) Moonrise 3:04PMMoonset 12:52AM Illumination 64% Phase: Waxing Gibbous; Moon at 9 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- 1220 Am Edt Mon Aug 20 2018
Rest of tonight..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Mon..W winds 5 to 10 kt, becoming S in the afternoon. Seas 2 ft. A slight chance of showers and tstms in the morning.
Mon night..S winds 10 to 15 kt. Seas 2 to 3 ft.
Tue..SW winds 10 to 15 kt. Seas 2 ft. A slight chance of showers and tstms.
Tue night..SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft, building to 3 to 4 ft after midnight. A slight chance of showers and tstms.
Wed..W winds 10 to 15 kt, becoming sw in the afternoon. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 ft. A chance of showers and tstms.
Thu..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Thu night..SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Fri..E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Fri night..SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1220 Am Edt Mon Aug 20 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. The area will be situated between an inland trough and atlantic high pressure through Tuesday. A cold front will approach the area from the northwest on Wednesday, then stall over or near the region through the end of the week.


7 Day Forecast for Marine Location Near Wilmington Island, GA
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Area Discussion for - Charleston, SC
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Fxus62 kchs 200423
afdchs
area forecast discussion
national weather service charleston sc
1223 am edt Mon aug 20 2018

Synopsis
The area will be situated between an inland trough and atlantic
high pressure through Tuesday. A cold front will approach the
area from the northwest on Wednesday, then stall over or near
the region through the end of the week.

Near term until 6 am this morning
Risk for coastal showers will linger for another 2-3 hours.

Otherwise, dry conditions will prevail through daybreak. Rain
cooled air has forced a lowering of low temperatures by a few
degrees, mainly across the far south. Debris cloudiness will
gradually thin with time.

Short term 6 am this morning through Wednesday
Monday: short wave ridging will develop aloft in response to
building heights from the parent anticyclone between bermuda and
the bahamas, while a digging trough will cross the great plains
and ms valley during the day, eventually reaching the oh and tn
valleys by 12z Tuesday. At the surface, the pattern is
basically the same as it has been of late, featuring a weak
inland trough and the bermuda-azores high aligned just off to
the SE and s. The environment remains fairly capped with more
large scale subsidence and the warm mid levels, and it'll take
until around 2-3 pm to reach our convective temps that are near
90f. With less overall moisture than recent days, as pwat ranges
from near 1.6" S to 2.0" n, the risk for showers t-storms is
nothing higher than 20-30% chances during the mid afternoon into
the evening. Any pulse severe risk is non-zero, since dcape is
still forecast as great as 1000 j kg.

Some late night marine convection from offshore could brush
charleston county, but with the steering flow wsw, we have kept
any mentionable pop over the atlantic. Status quo on MAX and min
temps; with both slightly warmer than normal.

Tuesday: the upstream short wave trough will pass through the
oh and tn valleys during the daytime hours, dampening somewhat
as it heads toward the mid-atlantic and NE at night. As this
transpires a cold front will push SE and approach the forecast
district late at night, as the oceanic ridge is nudged further
to the se. The prospects for diurnal convection is near or
actually a little below normal, as moisture profiles are even
less than on Monday, as pwat is down ~1.5- 1.8". Thus we have
nothing higher than 20-30% pop in the afternoon when convective
temps are achieved. Dcape is again near 1000 j kg, so the severe
risk is non-zero.

The tail of the short wave and its accompanying rrq of the
upper jet will move into the area during the late evening and
overnight, and this should keep at least isolated to scattered
pop in the forecast even during the typical nocturnal minimum
period.

Little change in both MAX and min temps from recent days,
although if coverage of convection is more than now forecast
Tuesday night, overnight lows would be a few degrees lower than
now forecast.

Wednesday: the short wave from at night will cross into the
atlantic during the morning, followed by dnva into the
afternoon. However, a secondary short wave will drop through the
western great lakes and help to maintain a broad mid and upper
trough across a good part of the eastern states. This forces a
cold front to push into or near the forecast zones, and that
will be the main mechanism for the development of showers and
t-storms. The latest guidance shows the main axis of moisture
just off the coast, and due to this we are hesitant to go
anything more than scattered pop, which "meshes" well with
surrounding wfo's. The forecast could require adjustments
though, pending where the cold front positions itself, and where
the best moisture plume sets up. Temps mainly 90-93f inland
from the coast.

Long term Wednesday night through Sunday
Models show a long wave trough over the eastern half of the
country Wednesday night. This trough will gradually shift
eastward and then lift to the north into Friday, followed by
zonal flow on Saturday. At the surface, a front is forecasted to
stall over or just offshore of our area during this time
period. This will lead to above normal pops and near or maybe
even below normal temperatures. But if the front positions
itself further offshore, then large changes in the forecast
would be needed.

Aviation 06z Monday through Friday
Vfr. Coverage of convection should be lower than the past few
afternoon evenings. Impact probabilities are too low to justify
a mention of tsra at either kchs or ksav.

Extended aviation outlook: small probabilities of brief flight
restrictions Monday and Tuesday due to afternoon evening
convection. Higher probabilities of brief flight restrictions
due to convection associated with a front Wednesday through
Friday.

Marine
Tonight: typical late-summer pattern with S SW winds this
evening shifting to SW overnight. Speeds will average 15 kt with
some higher gusts with seas 2-4 ft. Some stronger storms are
possible across the waters, mainly through this evening.

Monday and Monday night: a modest sw'erly gradient will exist
between an inland trough and the atlantic high to the SE and s.

With a boost from the sea breeze influences and subtle nocturnal
low level jetting, winds will be as high as 15 kt and gusty.

With little swell energy, seas will be generally be no larger
than 2 or 3 ft.

Tuesday through Wednesday: the offshore ridge is forced a
little further SE as a cold front eventually slips closer to the
se coast during mid week. The gradient tightens between these
two large scale features, especially late Tuesday and into
Tuesday night, where s-sw winds will reach as high as 15-20 kt
with higher gusts. Seas will respond and build to as high as 3-4
ft, maybe even 5 ft across the northern amz350 waters.

Thursday through Friday: the cold front will become stationary
over or near the waters the second part of the week, as
continental high pressure builds to the NW and n. Depending upon
where the front stalls out and the exact strength to the land
based high, there could be adjustments to the latest wind and
sea forecasts.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 6 mi48 min SW 1 G 1.9 77°F 84°F1017 hPa
41033 37 mi52 min SW 9.7 G 14 82°F 84°F1015.8 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 42 mi70 min S 12 G 14 82°F 82°F3 ft1016.8 hPa (-1.6)74°F
SAXG1 - Sapelo Island Reserve, GA 43 mi60 min Calm 78°F 1016 hPa (-2.0)75°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 mi64 minN 010.00 miA Few Clouds74°F71°F91%1016.2 hPa
Savannah-Hilton Head International Airport, GA14 mi67 minWNW 410.00 miFair74°F73°F97%1016.6 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi65 minN 09.00 miFair75°F73°F94%1016.6 hPa

Wind History from SVN (wind in knots)
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Last 24hrCalmCalmCalmCalmS4SW4W5W5W11W8S7S6S11S13S7SW6SW4S7CalmNE4CalmS5CalmCalm
1 day agoSW3S3W3CalmCalmCalmSW5SW7SW7W7SW10
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2 days agoCalmCalmCalmW3W3CalmW3W5W5CalmW3S9SE9S9SE10----S8SW6
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Tide / Current Tables for Savannah Sheraton Resort Hotel, Wilmington River, Georgia
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Savannah Sheraton Resort Hotel
Click for Map
Mon -- 01:52 AM EDT     Moonset
Mon -- 04:09 AM EDT     7.15 feet High Tide
Mon -- 06:51 AM EDT     Sunrise
Mon -- 10:24 AM EDT     0.98 feet Low Tide
Mon -- 04:03 PM EDT     Moonrise
Mon -- 04:53 PM EDT     7.97 feet High Tide
Mon -- 08:02 PM EDT     Sunset
Mon -- 11:17 PM EDT     1.31 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.43.85.36.67.16.85.84.531.81.11.123.356.67.687.56.55.13.52.11.3

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Mon -- 01:38 AM EDT     1.65 knots Max Flood
Mon -- 01:52 AM EDT     Moonset
Mon -- 05:04 AM EDT     -0.00 knots Slack
Mon -- 06:51 AM EDT     Sunrise
Mon -- 08:45 AM EDT     -1.65 knots Max Ebb
Mon -- 11:17 AM EDT     0.00 knots Slack
Mon -- 02:05 PM EDT     1.88 knots Max Flood
Mon -- 04:03 PM EDT     Moonrise
Mon -- 05:54 PM EDT     -0.00 knots Slack
Mon -- 08:01 PM EDT     Sunset
Mon -- 09:35 PM EDT     -1.98 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.61.61.40.90.1-0.9-1.4-1.6-1.6-1.3-0.30.81.61.91.81.50.9-0.1-1-1.5-1.9-1.9-1.3

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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 (3,6,7,8)
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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.