Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Whitemarsh Island, GA

Version 3.4
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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:50AMSunset 8:04PM Tuesday August 20, 2019 11:32 PM EDT (03:32 UTC) Moonrise 10:08PMMoonset 10:13AM Illumination 70% Phase: Waning Gibbous; Moon at 20 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- 901 Pm Edt Tue Aug 20 2019
Rest of tonight..SE winds 10 to 15 kt, becoming S 10 kt. Seas 1 to 2 ft.
Wed..SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 ft. A slight chance of showers and tstms.
Wed night..S winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Thu..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Thu night..S winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Fri..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Fri night..S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sat..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sat night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sun..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sun night..SE 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 901 Pm Edt Tue Aug 20 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure and an inland trough will prevail through late week. A cold front push into the region this weekend then will stall over or just south of the area through early next week.


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 210102
afdchs
area forecast discussion
national weather service charleston sc
902 pm edt Tue aug 20 2019

Synopsis
Atlantic high pressure and an inland trough will prevail
through late week. A cold front push into the region this
weekend then will stall over or just south of the area through
early next week.

Near term until 6 am Wednesday morning
The forecast philosophy has not changes much since early
evening. Only minor adjustments were made the various hourly
parameters.

A pronounced vorticity lobe associated with the mid-upper low
spinning over the south carolina upstate is progged to cross the
region early Wednesday. Given the warm, moist environment that
is in place, there will likely be at least some form of
convection associated with this feature. The best lift upper
divergence ahead of the vorticity lobe looks to remain over the
eastern midlands into the pee dee regions, but its tail end will
likely brush the charleston tri-county area. Will maintain
slight chance pops in this region during the very early morning
hours with rain-free conditions elsewhere.

Convection associated with various convective outflows over the
gulf stream should diminish over the next few hours. Some of
this activity could approach the colleton and charleston county
coasts through mid-evening. Overnight, the low-level steering
flow will veer with time which should keep any noctural,
marine-based convection confined to the coastal waters.

Lows will range from the mid 70s inland to around 80 at the
beaches.

Short term 6 am Wednesday morning through Friday
Wednesday through Friday: expect typical conditions for the latter
half of august, featuring scattered showers thunderstorms,
especially midday into early evening, and slightly above normal
temperatures with highs mainly in the lower 90s and lows in the
lower middle 70s inland and in the upper 70s near 80f on the
beaches. As usual, maximum heat index values in the 100-105f range
will be locally punctuated by the cooling influence of
thunderstorms.

Of note, the southern periphery of low pressure an associated pool
of mid-level vorticity centered near the nc va coast will brush our
region Wednesday, and this could enhance diurnal thunderstorm
coverage to some degree, particularly across sc counties. Otherwise,
thunderstorms will focus along the sea breeze and other mesoscale
boundaries through late week, so precise placement of thunderstorms
will remain elusive beyond the near-term forecast period. Also, a
cold front will approach the region Friday, but latest guidance
suggests that this boundary could remain too far to the north to
influence thunderstorms coverage across our region, unless organized
convection upstream manages to hold together to push into our area
late afternoon or during the evening. Meanwhile, pwat values
exceeding 2 inches will support locally heavy rainfall, while
diurnal instability will provide a daily potential for a
brief isolated severe thunderstorm. However, the potential for
significant coverage of excessive rainfall or for significant severe
weather will remain low through late week.

Long term Friday night through Tuesday
Low to moderate confidence this period. The pattern doesn't change
much until a cold front likely pushes into the area this weekend,
possibly moving through southeast ga as well early next week. We
prefer the slower wpc ECMWF guidance with regard to the frontal
passage timing. Eventually a more fall-like high pressure wedge
pattern should set up and feature cooler temperatures and above
normal rain chances. Think the severe storm risk will be low with
possibly a better risk for some flooding given the deep moisture and
weak storm motions leading to some training.

Aviation 01z Wednesday through Sunday
Vfr. Afternoon showers tstms will once again develop near the
terminals Wednesday afternoon. Impact probabilities are too low
to justify a mention of tsra at either terminal this far out.

Extended aviation outlook: occasional flight restrictions at
kchs ksav each day through Friday, mainly from afternoon evening
showers and thunderstorms. However,VFR most of the time during this
period. More frequent significant flight restrictions are likely this
weekend due to increased moisture and a cold front moving south
through the area.

Marine
Tonight: southerly winds will prevail with speeds around 10 kt.

Seas of 1-2 ft will build to 2-3 ft overnight.

Wednesday through Sunday: winds seas are expected to remain below
small craft advisory levels. However, thunderstorms will produce
locally hazardous conditions at any time. Through Saturday,
south southwest winds should average 10-20 knots, with strongest
winds likely during the daily sea breeze and at night give typical
nocturnal trends. A weakening cold front could push through the
waters by Sunday, and winds could turn toward the east. Seas outside
thunderstorms will average 1-3 feet through Saturday, highest beyond
20 nm, then seas could build slightly to 2-4 feet Sunday.

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 mi50 min S 4.1 G 5.1 82°F 84°F1020.4 hPa
41033 36 mi24 min S 12 G 16 83°F 85°F1019.9 hPa
ACXS1 - ACE Basin Reserve, SC 45 mi107 min SSE 1 83°F 1020 hPa78°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 48 mi42 min SSE 9.7 G 12 82°F 83°F2 ft1019.7 hPa (+0.7)78°F
SAXG1 - Sapelo Island Reserve, GA 48 mi92 min SSE 4.1 81°F 1019 hPa (+0.0)77°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 mi36 minSSE 610.00 miFair81°F75°F85%1019.2 hPa
Savannah-Hilton Head International Airport, GA10 mi39 minS 610.00 miMostly Cloudy80°F77°F90%1019.8 hPa
Hilton Head Island, Hilton Head Airport, SC20 mi37 minS 610.00 miFair82°F73°F74%1020.3 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrS3S4CalmCalm----Calm--CalmW3SW4CalmCalmSE4--S7--SE9--SE10S8SE6SE6S4
1 day ago--------SW4Calm--CalmCalmCalmW4W4----SE9S4SE6S5SE7SE9S9S5CalmSE3
2 days agoS7SW5SW8SW8W6--SW5SW4CalmSW4--SW9SW7W5W3CalmCalmSE7SE8S6S7S5SW8SW5

Tide / Current Tables for Fort Jackson, Savannah River, Georgia
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Fort Jackson
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Tue -- 06:26 AM EDT     0.56 feet Low Tide
Tue -- 06:51 AM EDT     Sunrise
Tue -- 11:13 AM EDT     Moonset
Tue -- 11:58 AM EDT     7.44 feet High Tide
Tue -- 06:34 PM EDT     1.11 feet Low Tide
Tue -- 08:02 PM EDT     Sunset
Tue -- 11:07 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.576.14.72.91.50.70.723.95.877.47.16.35.13.52.11.21.22.13.75.56.7

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Tue -- 12:50 AM EDT     -0.00 knots Slack
Tue -- 03:38 AM EDT     -1.66 knots Max Ebb
Tue -- 06:51 AM EDT     Sunrise
Tue -- 06:57 AM EDT     0.00 knots Slack
Tue -- 09:32 AM EDT     1.93 knots Max Flood
Tue -- 11:12 AM EDT     Moonset
Tue -- 01:05 PM EDT     -0.00 knots Slack
Tue -- 03:47 PM EDT     -1.68 knots Max Ebb
Tue -- 07:20 PM EDT     0.00 knots Slack
Tue -- 08:02 PM EDT     Sunset
Tue -- 09:52 PM EDT     1.61 knots Max Flood
Tue -- 11:06 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.5-0.1-1-1.6-1.6-1.4-0.901.11.81.91.40.70.1-0.8-1.5-1.7-1.4-1-0.30.61.41.61.3

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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Wind Forecast for Charleston, SC (23,6,7,8)
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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.