Tuesday, September18, 2018 L-36.com


Marine Weather and Tides
Dutch Island, GA

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Sunrise 7:08AMSunset 7:26PM Tuesday September 18, 2018 5:05 PM EDT (21:05 UTC) Moonrise 2:38PMMoonset 12:18AM 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- 322 Pm Edt Tue Sep 18 2018
Tonight..SW winds 10 to 15 kt, becoming W 5 to 10 kt late. Seas 2 to 3 ft. A slight chance of showers and tstms.
Wed..NW winds 5 to 10 kt, becoming ne in the afternoon. Seas 2 ft.
Wed night..E winds 5 to 10 kt. Seas 2 ft.
Thu..E winds 5 to 10 kt. Seas 2 ft.
Thu night..E winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms in the evening.
Fri..E winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Fri night..E winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Sat..NE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Sat night..E winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 322 Pm Edt Tue Sep 18 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak surface trough will slowly progress through the area tonight, then push offshore early Wednesday. High pressure will then prevail over the region through the weekend and into early next week.


7 Day Forecast for Marine Location Near Dutch Island, GA
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location: 31.98, -81.01     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 181932
afdchs
area forecast discussion
national weather service charleston sc
332 pm edt Tue sep 18 2018

Synopsis
A weak surface trough will slowly progress through the area
tonight, then push offshore early Wednesday. High pressure will
then prevail over the region through the weekend and into early
next week.

Near term until 6 am Wednesday morning
Tonight: the trough extending into the forecast area from remnants
of florence will continue to push east, with the axis reaching the
coast after midnight and pushing offshore tomorrow morning. A region
of strong low-level lapse rates exceeding 8 c km extends into our
inland georgia counties, and this aligns well with ongoing
convection observed on radar. Additionally, the seabreeze will serve
as a focal point for convective initiation. Less impressive mid-
level lapse rates are expected to assist with keeping convection
relatively shallow, though any storms that manage to deepen will tap
into some impressive downdraft capes, which could lead to strong
surface winds under collapsing cells. Convection over land will fade
with the loss of diurnal heating this evening, but a slight chance
will persist much of the night over coastal waters as the trough
axis nears, where greatest forcing aligns with warm ssts. Low
temperatures should remain several degrees above normal values.

Short term 6 am Wednesday morning through Friday
The latter half of the work week is expected to be fairly quiet with
plenty of sunshine and limited rain chances. A weak trough will be
pushing south and east of the area by daybreak Wednesday, allowing
high pressure to build in from the northwest. The high will expand
into the area Thursday and Friday, as heights build aloft.

Subsidence under the upper ridge will keep most, if not all, of the
forecast area dry through the period. The exception would be in far
southeast georgia near the altamaha river where slightly higher
moisture and convergence could spur a few showers. Pops are no
higher than 20% in those locations.

Temperatures will be slightly above normal. Highs will range from
the upper 80s to low 90s, with lows in the upper 60s inland to low
70s at the coast.

Long term Friday night through Tuesday
A quieter weather pattern will persist through the weekend while a
large ridge of high pressure remains over the southeast united
states. By early next week, the large ridge of high pressure will
become slightly more compressed and centered over the western
atlantic as a front approaches from the north, but likely stalls
well north northwest of the region. Most shower and thunderstorm
activity should remain offshore during the weekend or perhaps over
parts of coastal georgia where mid-lvl energy and an onshore wind
advects moisture over land. Thereafter, some guidance suggests
increasing chances of showers and thunderstorms Monday and Tuesday
as a coastal trough shifts onshore. High temps will generally range
in the mid upper 80s across southeast south carolina this weekend
and early next week. Some areas could touch 90 degrees across
southeast georgia. Overnight lows should range in the upper 60s to
around 70 degrees well inland to mid upper 70s along the coast.

Aviation 20z Tuesday through Sunday
Vfr conditions are expected to prevail at both kchs and ksav
through the 18z TAF cycle. While isolated showers thunderstorms
are expected to form along the seabreeze boundary into this
evening, probabilities from direct impacts remain too low at
either terminal, preventing inclusion of a prevailing tempo
group in the 18z tafs. Initially west west- southwest surface
winds will slowly veer north-northeast overnight.

Extended aviation outlook:VFR conditions are expected at the
terminals through Sunday. However, a brief shower or thunderstorm
could cause tempo flight restrictions on Sunday.

Marine
Tonight: a surface trough associated with remnants of florence will
cross the coastal waters during the overnight hours. Winds will
gradually veer north-northwest as surface windspeeds relax. Seas
will average 2 to 3 feet, with 4 ft possible beyond 30 nm.

Wednesday through Sunday: conditions are expected to remain below
small craft advisory criteria through the period. Surface high
pressure will build in from the north on Wednesday and will then
shift into the atlantic late week. This will keep winds mostly
onshore, with directions wavering between northeast and east. Speeds
on average will be 15 knots or less, possibly peaking in the 15-20
knot range Thursday into Thursday evening. Seas will generally range
between 2-3 ft Wednesday, then build to 3-4 ft Thursday afternoon or
night, before gradually subsiding through the weekend.

Rip currents: a moderate risk of rip currents continues through
today, with low risk currently expected for Wednesday.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Jmc
short term... Etm
long term... Dpb
aviation... Etm jmc
marine... Etm jmc


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi41 min S 5.1 G 8.9 88°F 83°F1011.6 hPa
41033 38 mi57 min SSW 12 G 18 84°F 84°F1011.1 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 41 mi135 min S 12 G 14 84°F 85°F3 ft1012.8 hPa (-2.2)76°F
SAXG1 - Sapelo Island Reserve, GA 42 mi65 min S 13 90°F 1011 hPa (-3.0)78°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 mi69 minSSE 810.00 miMostly Cloudy94°F76°F57%1010.7 hPa
Savannah-Hilton Head International Airport, GA15 mi12 minVar 310.00 miPartly Cloudy93°F72°F50%1010.7 hPa
Hilton Head Island, Hilton Head Airport, SC23 mi15 minS 1210.00 miClear90°F77°F67%1011.5 hPa

Wind History from SVN (wind in knots)
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Last 24hr------SE4--------------------SW4S3CalmSW4CalmW6CalmW5SW4SE8
1 day ago------------W14--------SW10SW9--SW6--SW7--SW11
G17
----SW8----
2 days ago------------------------------------------------

Tide / Current Tables for Savannah Sheraton Resort Hotel, Wilmington River, Georgia
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Savannah River Entrance, Georgia Current
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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 (17,4,5,8)
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Ground Weather Radar Station Charleston, SC
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weather_mapweather_map weather_map

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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.