Monday, May29, 2017 L-36.com


Marine Weather and Tides
Thunderbolt, GA

Version 3.4
What's New / NOTES
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 6:17AMSunset 8:25PM Monday May 29, 2017 1:48 AM EDT (05:48 UTC) Moonrise 9:22AMMoonset 11:21PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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- 1041 Pm Edt Sun May 28 2017
Overnight..S winds 10 kt...becoming sw. Seas 2 ft.
Mon..W winds 10 kt...becoming S 10 to 15 kt in the afternoon. Seas 2 ft.
Mon night..S winds 10 to 15 kt...becoming sw 5 to 10 kt after midnight. Seas 2 ft.
Tue..W winds 5 to 10 kt...becoming sw in the afternoon. Seas 2 ft. A slight chance of showers and Thunderstorms in the afternoon.
Tue night..S winds 5 to 10 kt...becoming sw after midnight. Seas 2 ft. A chance of showers and Thunderstorms... Mainly in the evening.
Wed..W winds around 5 kt...becoming se in the afternoon. Seas 2 ft. A slight chance of showers and Thunderstorms.
Wed night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and Thunderstorms.
Thu through Fri..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and Thunderstorms.
Fri night..S winds 10 kt. Seas 2 ft. A slight chance of showers and Thunderstorms. Mariners are reminded that winds and seas can be higher in and near tstms.
AMZ300 1041 Pm Edt Sun May 28 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will linger over the region into Monday. A weak cold front will gradually sag south across the area prior to midweek. Atlantic high pressure will extend west over the region late week into the upcoming weekend.

7 Day Forecast for Marine Location Near Thunderbolt, GA
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location: 32.04, -81.04     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 290241
afdchs
area forecast discussion
national weather service charleston sc
1041 pm edt Sun may 28 2017

Synopsis
High pressure will linger over the region into Monday. A weak cold
front will gradually sag south across the area prior to midweek.

Atlantic high pressure will extend west over the region late week
into the upcoming weekend.

Near term until 6 am Monday morning
Severe thunderstorm watch 295 has been cancelled for berkeley
and charleston counties, including the adjacent coastal waters.

The primary qlcs has weakened considerably over the past hour
with its remnants poised to push off the upper south carolina
coast shortly. A well defined west-east oriented outflow
boundary has settled in from roughly kogb and kmks per
kcae kclx reflectivity data, but it appears that enough
nocturnal cooling of the boundary layer has occurred to prevent
parcels from reaching the LFC this far south, especially now
that the weak shortwave has passed by to the north. Additional
convection is unlikely overnight.

For the late evening update, have lowered pops to slight chance
north of the i-16 corridor and adjusted hourly temperatures

Short term 6 am Monday morning through Wednesday
Monday: while the overall synoptic pattern remains similar, the mid
level flow backs a good bit during the day and we note a decent
increase in moisture between 800 mb and 700 mb during the day. This
will result in an uptick in pwats, likely weakening the strong mid
level cap during the late afternoon hours. Partly cloudy skies and
warming west boundary layer flow in the morning occur below rather
unstable mid layers, but models still show a good bit of NVA prior
to 21z Monday. A late day short wave is forecast to move from north
ga into the carolinas and this should be the main impetus to kick
off deep convection as upper flow trends more divergent toward 00z
Tuesday. Confidence on how convection plays out is very low, given
some wide variations on the 12z model runs today. SPC severe
weather outlook for day 2 looks well placed, but may need to
nudged a bit further SE to encompass our northwest and north
zones at some point. Until then, isolated severe weather is
possible across our northern ga and sc zones with damaging winds
and large hail the main risks. Another hot day in store with
highs in the low mid 90s.

Tuesday: a belt of elevated 1000 mb to 850 mb moisture will sag
southeast and further weaken the subsidence aloft while a series of
weak mid level short waves traverse north ga and the carolinas. The
convective temps should be a bit lower and diurnal convection will
likely be scattered by mid to late afternoon across much of the
forecast area. There may be a few strong to locally severe tstms
given potential boundary collisions and still quite a bit of dcape
progged. Highs expected to reach the lower 90s prior to any tstm
development.

Wednesday: the weak cold front may pass offshore by early Wednesday
before washing out and giving way to atlantic high pressure. Isolated
to locally scattered diurnal convection is possible, especially along
the sea breeze. Deeper moisture may also tend to build from far
south ga during the afternoon and a few showers and tstms could
linger into the evening hours south the savannah river.

Long term Wednesday night through Sunday
A fairly active period is in store as a quasi-zonal flow exists
aloft and weak shortwave perturbations continually traverse the
area. With increasing moisture through late in the week and
daytime temps in the upper 80s or low 90s, scattered to numerous
showers and tstms expected to develop mainly during the
afternoon and evenings.

Aviation 03z Monday through Friday
Vfr will prevail at both kchs and ksav. Thunderstorms are
expected to pass north of the kchs terminal this evening, but
could get close enough to pose a lightning risk. Will carry vcts
roughly 02-05z, but the risk for direct impacts are low.

Extended aviation outlook: mainlyVFR conditions. Brief flight
restrictions possible in mainly afternoon evening showers tstms
starting Monday.

Marine
Tonight: high pressure to the south will maintain a mainly
southwest flow across the local waters, mostly 15 kt or less.

Significant wave heights will be 2-3 feet.

The slightly stronger gradient will persist into Monday with a
decent 15 kt sea breeze in the afternoon, especially north of the
savannah and along coastal charleston county. Seas will continue in
the 2-3 ft range. Tuesday and Wednesday, fairly weak winds and small
seas are expected as a front drops into the area and lingers through
mid week. The flow will veer slightly more offshore in the late
night and morning hours as the land breeze oscillation comes and
goes. Atlantic high pressure will dominate into late week with south
to southwest flow continuing.

Equipment
The temperature sensor at ksav is running high during the
daytime hours. Use this data with caution, especially during
peak heating. The high temperature has been set to missing for
today. Technicians have been notified.

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 7 mi49 min SW 5.1 G 7 79°F 1013.8 hPa (+0.6)
41033 37 mi41 min SSW 12 G 16 79°F 79°F1012.7 hPa
SAXG1 - Sapelo Island Reserve, GA 45 mi49 min WSW 8 80°F 1014 hPa (+1.0)73°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi59 min SSW 12 G 14 80°F 78°F2 ft1013.5 hPa (+1.2)75°F
ACXS1 - ACE Basin Reserve, SC 47 mi64 min Calm 78°F 1013 hPa76°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, GA6 mi51 minN 010.00 miFair75°F72°F93%1013.1 hPa
Savannah, Savannah International Airport, GA11 mi56 minWSW 310.00 miFair76°F66°F74%1013.6 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi54 minS 610.00 miFair81°F77°F89%1013.5 hPa

Wind History from SVN (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmW5W8W8W12
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1 day agoCalmCalmCalmCalmCalmCalmCalmCalmW6W4W6SW6W7W8W9
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW6W6W8W10W5W5W6Calm----CalmCalmCalm

Tide / Current Tables for Thunderbolt, Wilmington River, Georgia
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Thunderbolt
Click for Map
Mon -- 06:09 AM EDT     -0.78 feet Low Tide
Mon -- 06:19 AM EDT     Sunrise
Mon -- 10:21 AM EDT     Moonrise
Mon -- 12:34 PM EDT     8.11 feet High Tide
Mon -- 06:23 PM EDT     -0.63 feet Low Tide
Mon -- 08:23 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
9.79.17.55.22.60.3-0.8-0.31.33.45.57.1887.15.43.10.9-0.5-0.41.13.35.77.7

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Mon -- 12:38 AM EDT     -0.01 knots Slack
Mon -- 03:58 AM EDT     -2.69 knots Max Ebb
Mon -- 06:18 AM EDT     Sunrise
Mon -- 06:52 AM EDT     0.01 knots Slack
Mon -- 09:20 AM EDT     2.24 knots Max Flood
Mon -- 10:20 AM EDT     Moonrise
Mon -- 01:05 PM EDT     -0.01 knots Slack
Mon -- 04:21 PM EDT     -2.40 knots Max Ebb
Mon -- 07:03 PM EDT     0.00 knots Slack
Mon -- 08:22 PM EDT     Sunset
Mon -- 09:44 PM EDT     2.68 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.8-0.5-1.8-2.5-2.7-2.4-1.30.21.62.22.11.71.10.1-1.1-2-2.4-2.3-1.5-0.11.52.52.72.3

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 (1,6,7,8)
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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.