Friday, August23, 2019 L-36.com


Marine Weather and Tides
Thunderbolt, GA

Version 3.4
NOTICE
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 6:52AMSunset 8:00PM Friday August 23, 2019 4:36 PM EDT (20:36 UTC) Moonrise 11:54PMMoonset 1:03PM Illumination 42% Phase: Third Quarter Moon; Moon at 23 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- 353 Pm Edt Fri Aug 23 2019
Tonight..S winds 5 to 10 kt. Seas 2 ft.
Sat..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Sat night..E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sun..NE winds 5 to 10 kt. Seas 3 ft. A chance of showers and tstms.
Sun night..NE winds 10 to 15 kt. Seas 3 ft. A chance of showers. A chance of tstms, mainly in the evening.
Mon..NE winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Mon night..SE winds 10 kt, becoming S after midnight. Seas 2 to 3 ft. A chance of showers. A chance of tstms, mainly in the evening.
Tue..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Tue night..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Wed..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Wed night..SW 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 353 Pm Edt Fri Aug 23 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will prevail today, before a cold front approaches from the north tonight. The front will cross through the area on Saturday then will stall offshore Sunday. Low pressure could develop along the front and track northeast and offshore through the first half of next week. Another cold front could impact the region late next week.


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 232018
afdchs
area forecast discussion
national weather service charleston sc
418 pm edt Fri aug 23 2019

Synopsis
Atlantic high pressure will prevail this evening, before a cold
front approaches from the north tonight. The front will cross
through the area on Saturday, then stall offshore Sunday. Low
pressure could pass well offshore during the first half of next
week. Another cold front could impact the region late next week.

Near term until 6 am Saturday morning
Through sunset: radar shows lines of convection across our
inland zones. This is in areas near where mlcapes are ~2,000
j kg with dcapes ~800 j kg. Hence, another marginally severe
pulse storm with damaging wind gusts cannot be ruled out in
these locations. Closer to the coast, the sea breeze moving
inland is making convection much more isolated. Cams have the
convection peaking in the next hour or so, then quickly
decreasing in intensity coverage around sunset.

Tonight: a cold front will approach from the north.

Additionally, moisture will increase ahead of the front. We
maintained slight chance pops far inland most of the night, then
have them expanding into the charleston tri-county before
daybreak. The remaining areas, especially in most of ga, should
be dry. Lows will be in the 70s.

Short term 6 am Saturday morning through Monday
Saturday: a cold front associated with a large mid upper lvl trough
of low pressure will approach from the northwest during the day.

Ahead of the front, an onshore wind will advect deep moisture
characterized by pwats between 2.00-2.25 inches across the region,
helping set up a round of at least scattered to numerous showers and
thunderstorms during the afternoon evening. Modest instability
(sbcape 1500-1750 j kg) should limit the overall severe weather
threat. However, an isolated strong or severe thunderstorm can not
be ruled out during the afternoon into early evening. The greater
concern will be localized heavy rainfall given deep moisture and
weak wind fields in place as the front slowly shifts into the
region. Activity should slowly weaken, but persist into overnight
hours. High temps should range in the upper 80s to lower 90s,
warmest away from the coast in southeast georgia. Overnight lows
should range in the low 70s inland to mid upper 70s near the coast.

Sunday and Monday: a cold front will slowly progress to the coast
and likely stall along or just offshore Sunday, then slowly drift
further south and east into Monday. As the occurs, a potential
tropical cyclone will track north northeast well offshore. The
position of the front and tropical entity offshore will play a
fairly significant role in how much precip can be expected across
southeast south carolina and southeast georgia early next week.

Precip chances should be highest east of the i-95 corridor on Sunday
where pwats remain between 2.00-2.25 inches near the slowly moving
front shifting offshore. Enhanced precip chances could persist near
the coast through Monday as tropical low pressure shifts past the
area well offshore, but the overall threat of heavy rainfall should
be more limited compared to Sunday given the expected position of
the sfc front offshore and the area remaining well west of any
tropical cyclone track. Severe weather potential is quite low Sunday
and especially Monday given abundant clouds and little instability.

Afternoon highs should be a few degrees below normal, ranging in the
mid upper 80s. Overnight lows should range around 70 well inland to
low mid 70s near the coast.

Long term Monday night through Friday
Models are in good agreement that low pressure will be lifting
northeast away from the area Monday night into Tuesday. Another cold
front could impact the region later in the period. There are some
discrepancies in regards to convective coverage but with elevated
moisture and shortwave energy, it looks to stay a bit unsettled.

Temperatures are expected to be near normal.

Aviation 20z Friday through Wednesday
18z tafs:VFR will prevail. Convection should remain inland of
the TAF sites through this evening, so there is no mention in
the tafs.

Extended aviation outlook: periodic flight restrictions are possible
Saturday Sunday due to showers thunderstorms associated with a
slowly passing cold front. Brief flight restrictions are possible
Monday and Tuesday behind a front stalled offshore.

Marine
Tonight: tranquil weather is expected with S to SE winds in the
evening, becoming mainly S or SW by daybreak. Seas will be 1-3
ft.

Saturday through Wednesday: a cold front will approach from the
north northwest Saturday and stall across the coastal waters through
early next week. Well south of the region, a tropical low should
slowly strengthen while gaining latitude off eastern florida,
remaining beyond all coastal waters while tracking north northeast
well off the southeast coast. The setup will initially favor
southeast winds across coastal waters Saturday at or below 10-15 kt,
before turning predominately northeast and increasing to 15-20 kt
Sunday and Monday as the pressure gradient tightens between the
stalled front and passing tropical low offshore. Seas should also
build up to 4-5 ft. Conditions could approach small craft advisory
levels for a period on Monday before the tropical low departs
north northeast of the region Tuesday. Conditions will then remain
well below small craft advisory levels through midweek.

Rip currents: increasing east northeast winds could contribute to an
enhanced risk of rip currents on area beaches late this weekend into
early next week, especially if tropical low pressure intensifies
while tracking well offshore.

Tides coastal flooding
Astronomical tides will be running close to minor coastal flood
advisory levels next week and onshore winds could lead to even
higher tides, mainly during the evening high tide cycles starting
Monday. In addition, there is the potential for some heavy rain
around the times of high tide which could exacerbate any flooding
issues.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term...

long term... Etm
aviation...

marine...

tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi54 min S 7 G 11 89°F 85°F1016 hPa
41033 37 mi28 min S 7.8 G 12 85°F 87°F1015.4 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi46 min SE 5.8 G 7.8 84°F 85°F2 ft1015.6 hPa (-1.9)76°F
SAXG1 - Sapelo Island Reserve, GA 45 mi96 min ESE 8 90°F 1016 hPa (-2.0)74°F
ACXS1 - ACE Basin Reserve, SC 47 mi111 min SSE 1.9 89°F 1016 hPa78°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 mi1.7 hrsS 910.00 miFair90°F75°F62%1015.5 hPa
Savannah-Hilton Head International Airport, GA11 mi1.7 hrsSE 810.00 miPartly Cloudy92°F73°F56%1015.5 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi1.8 hrsSSE 610.00 miFair88°F75°F66%1016.6 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrNE11
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E3SE8SE6S5--------S3S3----W3CalmCalm--S4SW5E3W4SE7S9S11
1 day agoS10S5S4S6S5S6--------W3--Calm--W3--SW4SW7SW7SW6SE4SE8SE10SE11
2 days ago--SE10S8SE6SE6S4--------Calm----CalmCalm--SW5W5SW6SW6CalmS8SE8SE11

Tide / Current Tables for Thunderbolt, Wilmington River, Georgia
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Thunderbolt
Click for Map
Fri -- 12:14 AM EDT     Moonrise
Fri -- 02:18 AM EDT     7.23 feet High Tide
Fri -- 06:53 AM EDT     Sunrise
Fri -- 08:11 AM EDT     0.94 feet Low Tide
Fri -- 10:58 AM EDT     Last Quarter
Fri -- 02:02 PM EDT     Moonset
Fri -- 02:49 PM EDT     8.11 feet High Tide
Fri -- 07:59 PM EDT     Sunset
Fri -- 08:48 PM EDT     1.72 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.96.87.276.14.631.611.22.33.95.677.98.17.56.14.5321.72.23.3

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Fri -- 12:13 AM EDT     Moonrise
Fri -- 03:08 AM EDT     -0.00 knots Slack
Fri -- 05:47 AM EDT     -1.46 knots Max Ebb
Fri -- 06:52 AM EDT     Sunrise
Fri -- 09:14 AM EDT     0.00 knots Slack
Fri -- 10:58 AM EDT     Last Quarter
Fri -- 12:02 PM EDT     1.83 knots Max Flood
Fri -- 02:01 PM EDT     Moonset
Fri -- 03:38 PM EDT     -0.00 knots Slack
Fri -- 06:16 PM EDT     -1.60 knots Max Ebb
Fri -- 07:58 PM EDT     Sunset
Fri -- 10:05 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.410.50.1-0.6-1.3-1.5-1.2-0.8-0.20.71.51.81.610.4-0.3-1.1-1.6-1.5-1.2-0.8-0.10.7

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Southeast    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (16,3,4,5)
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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.