Saturday, June23, 2018 L-36.com


Marine Weather and Tides
Tybee Island, GA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 6:17AMSunset 8:34PM Saturday June 23, 2018 11:08 PM EDT (03:08 UTC) Moonrise 3:35PMMoonset 2:18AM Illumination 82% Phase: Waxing Gibbous; Moon at 11 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 1023 Pm Edt Sat Jun 23 2018
Rest of tonight..SW winds 10 to 15 kt. Seas 3 ft.
Sun..SW winds 10 to 15 kt. Seas 2 to 3 ft.
Sun night..SW winds 15 kt with gusts to 20 kt. Seas 3 ft.
Mon..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms in the morning.
Mon night..SW winds 10 to 15 kt. Seas 3 ft. A chance of showers and tstms.
Tue..N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 to 3 ft. Showers and tstms likely.
Tue night..E winds 5 to 10 kt. Seas 2 to 3 ft. Showers and tstms likely, mainly in the evening.
Wed..E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..SE winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Thu..E winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Thu night..S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1023 Pm Edt Sat Jun 23 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will extend across the region through Monday. A cold front will drop south into the area Monday and linger near or just south of the area through mid-week.

7 Day Forecast for Marine Location Near Tybee Island city, GA
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location: 32.03, -80.85     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 240227
afdchs
area forecast discussion
national weather service charleston sc
1027 pm edt Sat jun 23 2018

Synopsis
High pressure will extend across the region through Monday. A
cold front will drop south into the area Monday and linger near
or just south of the area through mid-week.

Near term until 6 am Sunday morning
Late this evening: radar imagery shows that the last of the
convection has slipped well south of our georgia coastal waters.

For the rest of the night, all model data supports a dry
forecast and that is what is in place. Lingering convective
debris clouds will thin with time and skies should be mostly
clear by sunrise. Lows will be very similar to the last several
nights. No changes with this update.

Short term 6 am Sunday morning through Tuesday
Sunday: Sunday has the potential to be the hottest and most
humid day of the summer so far as mid-level heights rise in
response to the retrogression of the subtropical ridge offshore
and the main belt of the westerlies remain displaced well to the
north. The morning will start off quite warm and muggy with a
shallow layer of diurnal cumulus likely to develop through the
day. The cumulus is not expected to become too dense or
widespread given dewpoints are poised to mix out into the upper
60s lower 70s away from the coast courtesy of a modest westerly
flow aloft. If convection can initiate will would mostly likely
be confined to the sea breeze itself where low-level convergence
and localized enhanced instability due to the attendant
dewpoint surge would be the strongest. Maintained 20% pops with
the sea breeze, but suspect the day will be hot, humid and rain-
free. Guidance has shown a persistent signal in dropping an
outflow boundary south out of north carolina and across the pee
dee into the charleston tri-county area early Monday morning.

This feature could bring isolated to scattered shower tstms
prior to daybreak Monday. Will carry 20-30% pops in this area
with dry conditions elsewhere. It will be a downright hot and
muggy night with lows only dropping into the mid 70s inland to
the lower 80s at the coast, including downtown charleston.

Guidance shows a pocket of 20-22c h8 air becoming situated
across inland areas which should allow afternoon highs to
approach the century mark in a few locations, especially over
interior southeast south carolina. As noted earlier, dewpoints
are expected to mix out into the upper 60s lower 70s given the
westerly flow aloft, but should surge well into the 70s across
the coastal counties as the sea breeze progresses inland. A
westerly flow tends to pin the sea breeze to the immediate
coast, but the flow is not overly strong (10-20 kt) per 23 12z
guidance, so expect a fairly modest inland push to occur by mid
afternoon along mainly the lower south carolina coast as inland-
water thermal differentials reach as high as 20f. Should see
dewpoints surge into the upper 70s near 80 across much of
coastal south carolina into coastal chatham county, ga similar
to the past few afternoons. This will put heat indices in the
112-116 range across parts of the charleston metro area to 105-
110 along the i-95 corridor with around 105 farther to the west.

It should be noted that guidance has been too conservative with
the afternoon dewpoint surge each of the past three afternoons
with dewpoints reaching 78-80 at the kchs airport for several
hours. The necessary adjustment have been made in the gridded
forecasts to reflect this. Plan to hoist an excessive heat watch
for charleston and tidal berkeley for the potential for heat
indices around 115 degs with a heat advisory elsewhere. Both the
watch and advisory will run from 11 am until 8 pm.

Monday: the region will be fully embedded within a subsident,
downslope environment ahead of a backdoor cold front. Guidance
does suggest some weak h7 pooling of theta-e aligned with the
pinned sea breeze, which may be just enough to yield an isolated
tstm or two during the afternoon despite downslope
trajectories. It will continue hot and humid with highs in the
mid-upper 90s away from the beaches. Heat indices will once
again surge into the 105-110 range, but with slightly cooler
conditions expected over the coastal counties, values should
remain below excessive heat warning thresholds. A heat advisory
will likely be needed for many areas. Rain chances ramp up
Monday night as a backdoor cold front begins to enter the
forecast area from the north. The better rain chances will be
confined across the charleston tri-county area--ranging from 60%
there to 30% along the altamaha river. Lows will generally drop
into the mid 70s with upper 70s possible along the georgia and
far southern south carolina coasts.

Tuesday: it will quite unsettled with scattered to numerous
showers tstms expected as the backdoor cold front drops south
through the day and become stationary somewhere near the
altamaha river. High chance to likely pops will be depicted with
highs from the upper 80s north of the i-26 corridor to the mid
90s south of the i-16 corridor.

Long term Tuesday night through Saturday
The latest medium range model guidance suggests the stalled
cold front will linger through mid week before dissipating as an
offshore high pressure inland trough pattern sets up.

Temperatures will likely remain at or above normal through the
period, especially later in the week. Rain chances should
generally be near normal through the period.

Aviation 03z Sunday through Thursday
Vfr conditions are expected to prevail at kchs and ksav through
00z Monday. There is the potential for isolated thunderstorms
Sunday afternoon but chances of direct impacts to the terminals
are too low to include at this point.

Extended aviation outlook: risk for TSTM impacts possible
Monday night into Tuesday.

Marine
Tonight: high pressure offshore is allowing south to southwest
winds to prevail. Winds will peak along the immediate coastline
through early this evening. Though, locally higher gusts are
possible along the sc coastline. By late evening the winds will
ease a few kt, then a second surge is possible further offshore,
lasting until almost daybreak. Additionally, winds should veer
more towards the west around daybreak as the land breeze
develops. Seas will be range from 2-4 ft.

Sunday and Monday: a typical southern flow regime will persist
across the waters through Monday with afternoon surges expected
near the land sea interface with the sea breeze and nocturnal
surges over the georgia offshore and charleston nearshore legs.

Seas should remain 15 kt or less, but may gust to near 20 kt at
times during the typical summer time surge periods. Seas will
average 2-3 ft.

Monday night into Thursday: a backdoor cold front will begin to
move south across the waters late Monday night and become
stationary near the altamaha river late Tuesday afternoon. This
will result in a modest east to northeast wind through at least
Wednesday before backing more a more typical southerly direction
by Thursday. Winds will remain 15 kt or less with seas 2-4 ft.

Small craft advisory conditions are not expected.

Chs watches warnings advisories
Ga... Heat advisory from 11 am to 8 pm edt Sunday for gaz087-088-
099>101-114>119-137>141.

Sc... Heat advisory from 11 am to 8 pm edt Sunday for scz040-042>045-
047>049-051.

Excessive heat watch from Sunday morning through Sunday
evening for scz050-052.

Marine... None.

Near term... Bsh
short term... St
long term... Rjb
aviation... Bsh st
marine... Ms st


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 3 mi51 min SSW 4.1 G 6
41033 29 mi61 min SSW 3.9 G 5.8 83°F 82°F1014.2 hPa
ACXS1 - ACE Basin Reserve, SC 42 mi84 min Calm 81°F 1015 hPa74°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi79 min SSW 12 G 14 81°F 84°F1 ft1014.8 hPa (+1.5)
SAXG1 - Sapelo Island Reserve, GA 48 mi69 min SSE 5.1 76°F 1015 hPa (+2.0)73°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilton Head Island, Hilton Head Airport, SC15 mi74 minN 010.00 miFair82°F73°F74%1014.9 hPa
Hunter U. S. Army Airfield, GA16 mi73 minSSE 810.00 miFair80°F72°F78%1014.1 hPa
Savannah-Hilton Head International Airport, GA20 mi76 minS 710.00 miA Few Clouds78°F73°F87%1014.8 hPa

Wind History from HXD (wind in knots)
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Last 24hrSW7
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SW7SW76S6SW6SW6SW6SW6SW6SW8W9SW7SW7SW7W5W4N8
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1 day agoSW5
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SW5SW4SW4SW5CalmCalmSW8W4SW7W7S7SW7SW7S7S7S13S8S6S6S9SW108
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2 days agoCalmSW5SW44CalmCalmCalmS5SW5SW5SW5W5W4W5N5W4NW5SW8S12--S8S8SW10SW7
G12

Tide / Current Tables for Tybee Light, Savannah River, Georgia
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Tybee Light
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Sat -- 03:18 AM EDT     Moonset
Sat -- 04:48 AM EDT     6.58 feet High Tide
Sat -- 06:18 AM EDT     Sunrise
Sat -- 11:15 AM EDT     -0.08 feet Low Tide
Sat -- 04:34 PM EDT     Moonrise
Sat -- 05:34 PM EDT     7.33 feet High Tide
Sat -- 08:32 PM EDT     Sunset
Sat -- 11:57 PM EDT     0.25 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.723.65.26.36.6653.520.6-0.10.21.334.86.37.27.36.65.43.82.10.7

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 12:10 AM EDT     0.01 knots Slack
Sat -- 02:46 AM EDT     1.91 knots Max Flood
Sat -- 03:18 AM EDT     Moonset
Sat -- 06:12 AM EDT     -0.00 knots Slack
Sat -- 06:18 AM EDT     Sunrise
Sat -- 09:48 AM EDT     -2.02 knots Max Ebb
Sat -- 12:18 PM EDT     0.00 knots Slack
Sat -- 03:09 PM EDT     2.14 knots Max Flood
Sat -- 04:34 PM EDT     Moonrise
Sat -- 06:54 PM EDT     -0.00 knots Slack
Sat -- 08:32 PM EDT     Sunset
Sat -- 10:31 PM EDT     -2.39 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.211.81.91.71.20.2-0.8-1.5-1.9-2-1.5-0.40.91.82.121.71-0.1-1.1-1.8-2.3-2.3

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
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.