Tuesday, February20, 2018 L-36.com


Marine Weather and Tides
Wilmington Island, GA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:58AMSunset 6:16PM Tuesday February 20, 2018 10:40 AM EST (15:40 UTC) Moonrise 9:58AMMoonset 10:57PM Illumination 28% Phase: Waxing Crescent; Moon at 5 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- 1030 Am Est Tue Feb 20 2018
Rest of today..E winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog this afternoon.
Tonight..SE winds 5 to 10 kt. Seas 3 ft. Patchy fog in the evening. Areas of fog after midnight.
Wed..SE winds 5 to 10 kt. Seas 3 ft. Patchy fog in the morning.
Wed night..SE winds 5 to 10 kt. Seas 3 ft.
Thu..SE winds 5 kt. Seas 3 ft. Patchy fog in the morning.
Thu night..SE winds 5 to 10 kt. Seas 3 ft.
Fri..SE winds 5 to 10 kt. Seas 3 ft.
Fri night..SE winds 5 to 10 kt. Seas 3 ft.
Sat..S winds 5 to 10 kt. Seas 3 ft.
Sat night..S winds 10 to 15 kt. Seas 3 to 4 ft.
AMZ300 1030 Am Est Tue Feb 20 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A large area of high pressure will remain across the region for much of the week. A cold front should approach the area early 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 201154
afdchs
area forecast discussion
national weather service charleston sc
654 am est Tue feb 20 2018

Synopsis
A large area of high pressure will remain across the region for
much of the week. A cold front should approach the area early
next week.

Near term through tonight
Today: deep layered ridging will persist across the region with
a very strong upper level ridge anchored off the southeast u.S.

Coast. Foggy conditions prior to mid morning will support the
dense fog advisory until 10 am. Forecast soundings at key
forecast points indicate that the low level inversion will begin
to weaken in the 15z-16z time frame. This will leave us with a
fairly moist and mixed low level air mass for the afternoon
hours below a huge subsidence inversion between 3500 to 7000 ft.

Scattered to broken stratocumulus will stream northward across
the region with shallow isentropic ascent today. There could be
spotty brief showers with this regime but given the shallow
vertical moisture profiles, a silent 10 pop was retained across
the board. Very warm temps are expected with readings reaching
80 degrees at many areas this afternoon with lower 80s possible
in some areas along and west of i-95.

Tonight: persistence forecast with the stagnant synoptic pattern
in place. Another prime setup for stratus and foggy conditions
with the best chances for dense fog across southeast sc and
mainly the coastal corridor of southeast ga. Lows will be
similar to recent warm mornings in the upper 50s to near 60.

Short term Wednesday through Friday
A large ridge of high pressure centered over the western atlantic
will extend across the southeast united states, setting up
unseasonably warm temps through late week. 1000-850mb thickness
values support high temps about 15 degrees above normal, peaking in
the upper 70s to lower 80s each afternoon. Temps could potentially
tie or break record highs away from the immediate coast each
afternoon, especially Wednesday and Thursday when ridging appears to
be strongest over the southeast. See the climate section below. The
expansive ridge will also be responsible for producing a strong
inversion between 3-4 c around the h85 level each day, helping
maintain precip-free conditions for much of the week. A backdoor
cold front will attempt to approach from the north on Friday, but
will struggle to reach northern areas while encountering the ridge.

Fog remains the main issue during late night early morning hours as
a light southeast wind drives moisture onshore and helps produce
stratus that potentially builds down near the sfc. Given the setup,
bouts of fog will be possible as temps dip into the lower 60s
Wednesday night and into the upper 50s to around 60 Thursday night.

Patchy areas of fog remain in the forecast for most locations
Tuesday morning and again Wednesday night into early Thursday.

Long term Friday night through Monday
A large ridge of high pressure centered over the western atlantic
will be the primary contributor to the weather over the southeast
united states, maintaining warm conditions through the weekend. In
general, temps will be well above normal, peaking into the upper
70s lower 80s Saturday and Sunday. Overnight lows will be mild,
ranging in the upper 50s to lower 60s. The next substantial precip
chances should arrive late Sunday into Monday as a mid upper trough
passes to the north with a southward extending cold front moving
through the southeast. Pwats near 1.5 to 1.75 inches will be
possible along near the front, suggesting chances of showers over
most areas as FROPA occurs. Temps should be slightly cooler on
Monday with showers and fropa, peaking in the mid upper 70s. On
Tuesday, temps will remain cooler under a zonal flow aloft, peaking
in the low mid 70s.

Aviation 12z Tuesday through Saturday
Both terminals have seen an erosion of low stratus toward dawn
as some more in the way of 3-4 kft stratocumulus had developed
in the coastal corridor thanks to weak low level convergence.

Vsbys were still in the 1 2 to 3 4 nm range and there still
could be a return to the dense fog and vv002 conditions for a
brief period prior to 1330z before conditions gradually improve.

Around 15z, forecast soundings indicate lower CIGS should begin
to lift and then scatter out before midday.VFR is likely this
afternoon and then we will probably see a repeat performance of
advection stratus late this evening with ifr or lower conditions
overnight with a chance of dense fog once again.

Extended aviation outlook: flight restrictions are possible
Wednesday night into Thursday morning, then again Thursday night
into early Friday, mainly due to low stratus and or fog. Otherwise,
vfr conditions are expected.

Marine
This morning: a dense fog advisory is in effect for all near
shore waters including the chs harbor. Observations near the
land sea interface suggest the fog is more substantial up-river
and in the intra-coastal than offshore. With much uncertainty
prior to the day's first batch of visible satellite imagery, we
do not expect any changes to marine fog advisories at the
current time. Patchy fog may likely into the afternoon but
conditions not too favorable for sea fog development with a weak
coastal trough lingering and lack of southerly flow. Tonight,
the greatest chances for fog should once again be up-river and
close to the land sea interface but cannot rule out more fog
advisories.

Light onshore winds will trend southeast by tonight with speeds
below 15 kt and seas 2 to 4 ft, highest well offshore.

Wednesday through Sunday: high pressure will dominate over the
coastal waters through late week. The pattern favors quiet
conditions in regards to winds seas. However, sea fog will
potentially be an issue Wednesday into Friday as lower 60 dewpts
spread across slightly cooler nearshore waters. Marine dense fog
advisories are possible. In general, southeast winds should remain
at or below 10 kt under the influence of strong high pressure, then
gradually turn more south and increase to 10-15 kt ahead of a cold
front approaching the waters early next week. Seas will range
between 2-4 ft in nearshore waters and peak near 4-5 ft in offshore
georgia waters.

Climate
Tuesday 2 20 chs 82 1991
sav 84 1991
Wednesday 2 21 chs 82 1991
sav 83 1991
Thursday 2 22 chs 82 1991
sav 83 1991
cxm 77 2011

Equipment
The downtown charleston observation site (kcxm) has stopped
reporting. We are unsure when the data will be restored.

Chs watches warnings advisories
Ga... Dense fog advisory until 10 am est this morning for gaz087-088-
099>101-114>119-137>141.

Sc... Dense fog advisory until 10 am est this morning for scz040-
042>045-047>052.

Marine... Dense fog advisory until 1 pm est this afternoon for amz350-
352-354.

Dense fog advisory until 10 am est this morning for amz330.

Near term...

short term... Dpb
long term... Dpb
aviation...

marine... Dpb
climate...

equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 6 mi41 min E 6 G 8 62°F 59°F1031 hPa (+1.4)
41033 37 mi33 min ENE 3.9 G 5.8 61°F 58°F1030.1 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 42 mi51 min ESE 7.8 G 9.7 64°F 57°F4 ft1029.6 hPa (+1.2)64°F
SAXG1 - Sapelo Island Reserve, GA 43 mi41 min ESE 6 75°F 1030 hPa (+1.0)70°F
ACXS1 - ACE Basin Reserve, SC 48 mi56 min ESE 1 73°F 1031 hPa68°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 mi45 minESE 610.00 miFair72°F71°F96%1030.1 hPa
Savannah-Hilton Head International Airport, GA14 mi48 minSSE 510.00 miA Few Clouds75°F66°F76%1030.5 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi51 minNNE 510.00 miClear72°F66°F83%1031.2 hPa

Wind History from SVN (wind in knots)
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Last 24hrNE3SE4SE3S7S5S9SE6E6E5E5E4E5E5CalmCalmCalmCalmCalmCalmCalmE4CalmE5SE6
1 day agoW6CalmCalmE4E15E15E13E10E5NE5NE7NE5NE3NE3CalmNE3CalmNE3NE4NE3N4NE3NE3NE3
2 days agoE7SE4S6S8SE8S9S9S4CalmS3SW6CalmS5SW4SW5SW6SW5SW6SW4SW3W3W5W4W5

Tide / Current Tables for Savannah Sheraton Resort Hotel, Wilmington River, Georgia
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Savannah Sheraton Resort Hotel
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Tue -- 04:58 AM EST     -0.18 feet Low Tide
Tue -- 07:01 AM EST     Sunrise
Tue -- 09:57 AM EST     Moonrise
Tue -- 11:07 AM EST     7.56 feet High Tide
Tue -- 05:23 PM EST     -0.34 feet Low Tide
Tue -- 06:14 PM EST     Sunset
Tue -- 10:57 PM EST     Moonset
Tue -- 11:30 PM EST     7.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.15.63.81.90.4-0.20.42.14.15.97.17.57.26.24.52.60.8-0.2-0.11.23.35.46.97.8

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Tue -- 02:41 AM EST     -2.06 knots Max Ebb
Tue -- 06:06 AM EST     0.00 knots Slack
Tue -- 07:00 AM EST     Sunrise
Tue -- 08:41 AM EST     1.98 knots Max Flood
Tue -- 09:56 AM EST     Moonrise
Tue -- 12:21 PM EST     -0.00 knots Slack
Tue -- 03:12 PM EST     -1.96 knots Max Ebb
Tue -- 06:13 PM EST     Sunset
Tue -- 06:27 PM EST     0.00 knots Slack
Tue -- 09:07 PM EST     2.21 knots Max Flood
Tue -- 10:56 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.1-1.1-1.9-2-1.7-1.1-0.111.81.91.50.90.3-0.6-1.5-1.9-1.8-1.4-0.50.71.72.221.3

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for Charleston, SC (10,2,3,4)
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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.