Monday, August21, 2017 L-36.com


Marine Weather and Tides
Whitemarsh 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 6:52AMSunset 8:02PM Monday August 21, 2017 12:33 AM EDT (04:33 UTC) Moonrise 5:37AMMoonset 7:08PM Illumination 1% Phase: Waning Crescent; Moon at 29 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- 1025 Pm Edt Sun Aug 20 2017
Rest of tonight..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Mon..SE winds 5 kt, becoming E in the afternoon. Seas 2 ft. A chance of showers and tstms.
Mon night..SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms, mainly in the evening.
Tue..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Tue night..S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Wed..S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Wed night..S winds 10 kt. Seas 2 to 3 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..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Fri..NE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Fri night..NE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1025 Pm Edt Sun Aug 20 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak stationary front will gradually dissipate across the region early this week. A stronger cold front is expected to pass over the region on Thursday. Slightly cooler and drier conditions are expected through the rest of the week into next weekend.

7 Day Forecast for Marine Location Near Whitemarsh Island, GA
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location: 32.08, -81.03     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 210237
afdchs
area forecast discussion
national weather service charleston sc
1037 pm edt Sun aug 20 2017

Synopsis
A weak stationary front will gradually dissipate across the
region early this week. A stronger cold front is expected to
pass over the region on Thursday. Slightly cooler and drier
conditions are expected through the rest of the week into next
weekend.

Near term until 6 am Monday morning
Latest satellite loop continues to show abundant mid and upper
level clouds across the entire region. Expect mostly
cloudy cloudy conditions to prevail through the night. The area
of convection off the fl ga coast has died down in the past few
hours, but there is still a lot of mid and high clouds streaming
northward toward the area. Most models indicate a redevelopment
of convection later tonight over the atlantic waters, which
would at least push more mid high clouds back toward the coast,
even showers thunderstorms don't reach the coast. Have continued
gradual ramp up of pops from the atlantic toward the coast later
tonight. Latest NAM now has shifted emphasis toward more
showers clouds south of beaufort, sc and into our southeast ga
coast. This could be a positive trend toward possibly better
eclipse viewing potential, but still too much uncertainty to
reflect in sky cover forecast.

Short term 6 am Monday morning through Wednesday
Monday and Monday night: the mid and upper level pattern continues
to look complex for eclipse day as the expansive ridge and
anticyclone stretches from the subtropical atlantic to the lower
mississippi valley. Around the periphery of this ridge is a well
defined disturbance that is progged to push into the southeast
coast, somewhere along the georgia coast. At the surface, this
disturbance currently shows up clearly as a large mass of clouds off
the central florida coast. Model consensus brings this feature to
the georgia south carolina coast with an uptick in shower and
thunderstorm activity Monday morning. The models may be finally
consolidating around most of the morning convection impacting the
georgia coast. The highest pop's have been placed in this area (40-
50 percent chances) with 30-40 percent chances up the south carolina
coast. Still, much uncertainty remains regarding the coverage of
morning convection, its placement, and the resulting cloud cover
that will impact eclipse viewing into the early afternoon. Under the
scenario where southeast georgia has most of the convection,
southeast south carolina could see some partial clearing by the
early afternoon. Then later in the afternoon, additional convection
could develop but coverage is expected to be limited to scattered.

The severe threat is low, but as usual any thunderstorms that
develop will be capable of producing heavy rain and cloud to ground
lightning. Highs are expected to be around 90 in the region closer
to the coast with low 90s further inland. Overnight, any convection
that develops will be limited to the coastal waters. Lows will be a
persistence forecast in the mid to upper 70s.

Tuesday through Wednesday: the large mid upper level ridge will
remain across the region through Tuesday, with a subtle shift to a
more cyclonic flow by Wednesday. At the surface, a subtropical high
will be the controlling feature through Tuesday and a cold front
will begin to approach the region late in the day Wednesday.

Convection coverage will be limited, mainly along the sea breeze and
isolated to scattered in the afternoon evening hours. The best
chance for rain may be Wednesday when low level convergence
increases gradually ahead of the front to the west. Highs will be
mainly in the low 90s, possibly mid 90s well inland.

Long term Wednesday night through Sunday
A cold front should push across the forecast area on Thursday,
likely supporting a band of thunderstorms. Pops on Thursday have
been increase into the likely range across most of the forecast
area. High pressure sourced from canada will remain centered
well north of the region through the rest of the week.

Confidence in the day 5 through 7 forecast is low. Medium range
guidance indicates that the sfc high center will shift over new
england, ridging SW across the carolinas and ga. In addition,
both the GFS and ECMWF show a coastal low developing off the
ga sc coast by late this week. Guidance supports prolonged ne
winds, yielding afternoon dewpoints in the upper 60s inland by
the weekend. I will favor the marine and near shore zones for
chc pops through much of the day 5 through 7 period.

Aviation 03z Monday through Friday
Through tonight: expectVFR to prevail. Have brought chances for
showers thunderstorms into the both sites a little earlier given
latest meso-models. Still not very confident on the timing of
the convection redeveloping later tonight, but wanted to at
least show a trend that was a little earlier than previous
forecast. Brief flight restrictions possible later tonight and
toward sunrise with any showers thunderstorms.

Extended aviation outlook: thunderstorms may result in short periods
of flight restrictions, greatest potential during the afternoon and
early evening. Patchy fog is possible over wet soil Wednesday
morning.

Marine
Tonight: no highlights or significant changes made to the
previous forecast. Expect scattered to numerous showers and
thunderstorms to develop from southeast to north-northwest later
tonight. Winds generally 10 knots or less and seas 2 to 3 feet.

Monday through Friday: subtropical high pressure will be the primary
feature through Wednesday. Winds will be southeasterly for Monday,
then turning more south and southwesterly through Wednesday. Wind
speeds will be 15 knots or less through mid week. Seas will average
2-3 feet during this time with some 4 footers possible in the outer
waters. Then for the latter part of the week, large high pressure
centered over the great lakes will build over the region by Friday.

Also, a coastal low could develop off the georgia and south carolina
coast late Friday. Winds should shift to northeasterly with
increasing speeds by Friday afternoon. Seas are expected to be 2-4
feet.

Rip currents... The combination of swell, onshore flow, and
astronomical influences have led to a favorable environment for
rip currents. Considering the fact that we had numerous rip
currents reported today and that it is basically a persistence
forecast, will maintain the moderate risk through Monday.

Tides coastal flooding
Astronomical influences will continue to produce elevated tides
through Tuesday. Only small tidal departures are necessary and
we could approach shallow coastal flooding levels with the
evening high tides along parts of the sc coast. Coastal flood
advisories might be needed.

Climate
Record high minimums for august 20...

kchs... 78 set in 2010 and previous.

Kcxm... 80 set in 2009 and previous.

Ksav... 82 set in 1878.

Equipment
Kclx continues to be down, but technicians are now on site to
assess the situation.

The temperature and dew point sensors at the downtown charleston
observation site (kcxm) could periodically fail. Technicians
plan on fixing the problem.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Rfm
short term...

long term...

aviation...

marine...

tides coastal flooding...

climate...

equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi46 min S 2.9 G 4.1 83°F 87°F1020.5 hPa
41033 36 mi86 min S 7.8 G 12 85°F 1019.8 hPa
ACXS1 - ACE Basin Reserve, SC 45 mi109 min SE 1 84°F 1020 hPa79°F
SAXG1 - Sapelo Island Reserve, GA 48 mi94 min Calm 84°F 1020 hPa (+2.0)78°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 48 mi44 min SSE 12 G 16 84°F 85°F2 ft1019.5 hPa (+1.2)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, GA7 mi96 minSE 310.00 miMostly Cloudy82°F77°F84%1019.5 hPa
Savannah-Hilton Head International Airport, GA10 mi41 minSE 410.00 miMostly Cloudy83°F77°F82%1020.1 hPa
Hilton Head Island, Hilton Head Airport, SC20 mi39 minS 410.00 miPartly Cloudy84°F78°F84%1020.3 hPa

Wind History from SVN (wind in knots)
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Last 24hrCalmW3SW3CalmCalmCalmW3CalmS3CalmCalmE5SE5SE5NE4SE7S8SE8SE8SE7SE6SE5SE3SE5
1 day agoSW6SW7SW6W5W5CalmSW3SW3SW3W6S3SW4W5W5CalmW3S7S8S7S5S4S3S3Calm
2 days ago--S3S4SW4SW6W6--SW4W5NW8NW5N5SW3W5W6S7S11S9
G17
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Tide / Current Tables for Fort Jackson, Savannah River, Georgia
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Fort Jackson
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Mon -- 03:09 AM EDT     -0.44 feet Low Tide
Mon -- 06:36 AM EDT     Moonrise
Mon -- 06:52 AM EDT     Sunrise
Mon -- 08:57 AM EDT     8.04 feet High Tide
Mon -- 02:31 PM EDT     New Moon
Mon -- 03:24 PM EDT     -0.82 feet Low Tide
Mon -- 08:01 PM EDT     Sunset
Mon -- 08:07 PM EDT     Moonset
Mon -- 09:16 PM EDT     8.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.42.40.5-0.40.11.94.26.47.787.66.34.52.50.6-0.7-0.51.23.86.48.28.98.77.7

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Mon -- 12:45 AM EDT     -2.54 knots Max Ebb
Mon -- 03:25 AM EDT     0.01 knots Slack
Mon -- 06:01 AM EDT     2.04 knots Max Flood
Mon -- 06:36 AM EDT     Moonrise
Mon -- 06:51 AM EDT     Sunrise
Mon -- 09:37 AM EDT     -0.00 knots Slack
Mon -- 01:07 PM EDT     -2.46 knots Max Ebb
Mon -- 02:31 PM EDT     New Moon
Mon -- 03:37 PM EDT     0.01 knots Slack
Mon -- 06:21 PM EDT     2.55 knots Max Flood
Mon -- 08:00 PM EDT     Sunset
Mon -- 08:07 PM EDT     Moonset
Mon -- 10:03 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.4-2.5-1.9-0.60.81.821.91.50.7-0.5-1.5-2.1-2.5-2.2-10.61.92.52.52.11.30.1-1.2

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 (0,6,7,8)
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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.