Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Thunderbolt, GA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:45AMSunset 7:58PM Saturday April 21, 2018 5:42 AM EDT (09:42 UTC) Moonrise 10:36AMMoonset 12:00AM Illumination 35% Phase: Waxing Crescent; Moon at 6 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- 319 Am Edt Sat Apr 21 2018
Today..E winds 15 to 20 kt. Seas 4 to 5 ft.
Tonight..E winds 15 to 20 kt. Seas 4 to 5 ft.
Sun..E winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Seas 4 to 5 ft. A slight chance of showers in the morning, then a chance of showers in the afternoon.
Sun night..E winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 6 ft, building to 5 to 7 ft after midnight. A chance of showers in the evening, then showers after midnight.
Mon..SE winds 20 to 25 kt with gusts to 30 kt. Seas 6 to 8 ft. Showers with a slight chance of tstms.
Mon night..SE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 6 to 8 ft, subsiding to 5 to 7 ft after midnight. Showers with a slight chance of tstms in the evening, then a chance of showers after midnight.
Tue..S winds 10 to 15 kt. Seas 4 to 6 ft. A slight chance of showers.
Tue night..SW winds 10 kt. Seas 4 to 5 ft. A slight chance of showers.
Wed..W winds 10 kt. Seas 3 to 4 ft.
Wed night..W winds 10 kt. Seas 3 to 4 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 319 Am Edt Sat Apr 21 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Cool and dry high pressure will prevail into Sunday. A low pressure system will approach the area late Sunday and will then slowly move up the coast through the middle of next week. Weak high pressure will return 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 210803
afdchs
area forecast discussion
national weather service charleston sc
403 am edt Sat apr 21 2018

Synopsis
Cool and dry high pressure will prevail into Sunday. A low
pressure system will approach the area late Sunday and will
then slowly move up the coast through the middle of next week.

Weak high pressure will return late next week.

Near term through tonight
Early this morning: a humongous range of temps from north to
south, ranging from as cold as the upper 30s-lower 40s in
places such as witherbee, walterboro and summerville to as warm
the lower 60s in mcintosh county and at fort pulaski and hilton
head. Broken stratocumulus and altocumulus clouds will cover
locations near and south of savannah prior to daybreak, while
the rest of the forecast region will be clear with no more than
a few thin cirrus clouds.

For today: flat ridging will develop in between one deep cyclone
just offshore of eastern canada and a deep cu-off low heading
eastward through the panhandles of texas and oklahoma. Surface
high pressure near the mason-dixon line early will shift toward
the DELMARVA this afternoon, supplying the region with a
constant fetch off the atlantic. This along with isentropic
ascent will allow for increasing stratocumulus and altocumulus
clouds to impact much of SE georgia, with no more than few to
scattered flat cumulus and stratocumulus elsewhere. Some of the
hi-res models hint at a few very light showers or sprinkles near
the altamaha river basin, but we have maintained a rainfree
forecast with a solid subsidence cap in place across the vast
majority of locations. The flow off the ocean and h8 temps that
are only 8-9c or about 1 standard deviation below normal, will
limit MAX temps to the upper 60s and lower 70s most communities.

Exceptions will be the immediate coast where middle 60s are more
common and maybe a few mid 70s near and west of us-301, where
they are furthest from the atlantic and where there is
sufficient insolation. A decent pressure gradient around the
surface high will generate breezy e-ne winds, averaging 20-25
mph along the coast, and 10-20 mph further inland.

Tonight: flat mid level ridging will prevail aloft in advance
of the cut- off low that shifts toward the ARKLATEX and eastern
oklahoma. Surface high pressure holds firmly in place to the
n-ne as low pressure develops in close proximity to the cyclone
aloft over the central part of the country. Strengthening
isentropic ascent and a continued influx of low level moisture
off the ocean will lead to increasing cloudiness from s-sw to
n-ne. However, there is enough time for temps to cool to the
upper 40s and lower 50s across much of the charleston quad-
county district away from the coast and maybe allendale and
hampton counties before clouds move in after midnight. Most
other areas will only get down to the mid and upper 50s. There
could be a few showers heading toward the coast of south
carolina late with the low level convergence, plus some showers
making their way toward the altamaha river toward morning where
the strongest isentropic ascent and deepest moisture will
reside.

Short term Sunday through Tuesday
An active and wet period on tap for the southeast early in the week.

A closed upper low and associated surface reflection will drift east
across the gulf coast states on Sunday. Cloud cover will thicken and
there could be a few showers, but largely the bulk of the rainfall
is expected to be later Sunday into Monday when the deepest moisture
arrives. Pops are generally in the 20-30% range. Cool onshore flow
will keep high temperatures below normal.

The low pressure system will continue to approach Sunday night with
a warm front progged to lift north into the area on Monday. Ample
forcing for ascent will overspread the area - shortwave energy,
upper diffluence, and isentropic ascent. These features will combine
with precipitable water values near climatological maximums (1.6-1.7
inches) to produce widespread showers, spreading from south to
north. Marginal instability along and south of the warm front will
support a mention of thunder, which will mainly be across the
georgia zones during the day. Severe threat appears low at this
time. Of bigger concern would be flooding potential, but
luckily given antecedent conditions it appears less likely.

Current storm total rainfall has most areas seeing at least 2-3
inches, with some higher amounts possible. Otherwise, easterly
winds will increase through the day as the forecast area becomes
positioned between the approaching low and stubborn high
pressure to the north. Wind gusts will be around 25-30 mph, and
possibly 30-35 mph along the immediate coast.

Monday night into Tuesday, the surface low will linger in the area
but will slowly start to lift northeast. Rain chances should begin
to decrease from south to north as drier air works into the area.

Pops will range from 20% near the altamaha to 50-60% across the
northern zones.

Long term Tuesday night through Friday
Mid level troughing will persist over the eastern u.S. Through late
week. At the surface, an area of low pressure will slowly lift
northeast up the coast Wednesday into Thursday. There are some
discrepancies in the models thereafter, but it appears that a cold
front could be approaching the forecast area closer to the weekend.

Rain chances will remain fairly low through the period with no more
than 20% in the forecast at this time. Temperatures will be near
normal.

Aviation 08z Saturday through Wednesday
Although ksav has a small potential for a brief period of
high-end MVFR ceilings today, both that terminal and kchs will
beVFR through 06z Sunday. East winds will peak at least as high
as 15-20 kt during the late morning and afternoon at both
sites.

Extended aviation outlook: flight restrictions in reduced
ceilings and visibilities are expected Sunday night into at least
Monday night. Gusty winds expected on Monday.

Marine
Today: strong high pressure centered in the NE quadrant of the
nation will dominate and maintains about a 3 mb spread from
north to south across the waters. This is enough to produce
ne-e winds of 15-20 kt with frequent higher gusts on the south
carolina waters, and closer to 20 or 25 kt on the georgia
waters. The prolonged onshore fetch will allow for seas as high
as 4 or 5 ft within 20 nm and up to 6 to 7 ft on the outer
georgia waters through the day. For now we have just one small
craft advisory on the waters 20-60 nm off the georgia coast.

However, we still might need to hoist an advisory closer to
shore and maybe even in charleston harbor. But since we feel
that any combination of 6 foot seas and or 25 kt wind gusts
will be limited in frequency and coverage, we have opted not
to go with any advisory at this time elsewhere.

Tonight: a modest gradient holds in place between high pressure
to the north and low pressure forming near the arklatex. This
pattern will maintain e-ne winds at similar speeds and seas to
what they were today. So for now the only advisory is again on
the outer georgia waters, although the others will be close.

Sunday through Thursday: marine conditions will deteriorate Sunday
as a low pressure system approaches the area. Small craft advisories
will be needed for all waters beginning as early as Sunday evening.

Elevated east southeast winds will persist through Monday, and there
continues to be some indications that gusts could approach gale
force Monday afternoon, mainly in the charleston county waters.

Winds will vastly improve on Tuesday, however seas will take a
bit longer to subside. Marine zones should be headline-free by
Wednesday afternoon. No issues expected thereafter as the
surface low lifts northeast away from the area.

Rip currents: moderate to locally strong onshore winds and small
swells will impact the beaches today, leading to a moderate
risk of rip currents. The georgia beaches do have a chance of
requiring a high risk, but only if winds are a little more than
now in the forecast.

Rip currents: a prolonged stretch of moderate to perhaps strong
onshore winds and larger surf will lead to an enhanced risk of rip
currents at the beaches early next week.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until 2 pm edt Wednesday for amz374.

Near term...

short term... Ect
long term... Ect
aviation...

marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi43 min E 15 G 20 62°F 65°F1025.6 hPa (-0.0)
41033 37 mi35 min E 16 G 23 62°F 63°F1025.1 hPa
SAXG1 - Sapelo Island Reserve, GA 45 mi43 min ENE 8.9 63°F 1024 hPa (-1.0)51°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi53 min ENE 18 G 19 65°F 64°F5 ft1023.3 hPa (-0.7)54°F
ACXS1 - ACE Basin Reserve, SC 47 mi58 min N 1 53°F 48°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 mi47 minENE 710.00 miFair59°F42°F53%1024.7 hPa
Savannah-Hilton Head International Airport, GA11 mi50 minNNE 510.00 miPartly Cloudy50°F46°F89%1025.6 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi48 minENE 11 G 1810.00 miFair61°F42°F52%1026.1 hPa

Wind History from SVN (wind in knots)
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NE4E8E9E9E6NE4NE5NE4NE5NE4CalmCalmNE7
1 day agoSW8SW9SW9SW11W13
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W13--W18W18
G24
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W14W11W6NW12
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N8N11N10N9N9NE9
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2 days agoSW4SW5SW5W10W10W11W8SW13W12SW13
G17
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SW10S6S5S6SW8SW6SW6SW6SW10SW11W12

Tide / Current Tables for Thunderbolt, Wilmington River, Georgia
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Thunderbolt
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Sat -- 12:57 AM EDT     Moonset
Sat -- 01:15 AM EDT     9.01 feet High Tide
Sat -- 06:48 AM EDT     Sunrise
Sat -- 07:29 AM EDT     0.13 feet Low Tide
Sat -- 11:36 AM EDT     Moonrise
Sat -- 01:54 PM EDT     7.58 feet High Tide
Sat -- 07:46 PM EDT     0.09 feet Low Tide
Sat -- 07:57 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.398.77.55.73.51.50.30.31.334.86.37.37.675.73.920.50.10.92.64.7

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 12:56 AM EDT     Moonset
Sat -- 02:12 AM EDT     -0.00 knots Slack
Sat -- 05:09 AM EDT     -2.19 knots Max Ebb
Sat -- 06:47 AM EDT     Sunrise
Sat -- 08:28 AM EDT     0.00 knots Slack
Sat -- 10:54 AM EDT     1.76 knots Max Flood
Sat -- 11:35 AM EDT     Moonrise
Sat -- 02:41 PM EDT     -0.00 knots Slack
Sat -- 05:34 PM EDT     -1.89 knots Max Ebb
Sat -- 07:56 PM EDT     Sunset
Sat -- 08:38 PM EDT     0.00 knots Slack
Sat -- 11:23 PM EDT     2.27 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.10.2-0.9-1.9-2.2-2.1-1.6-0.60.61.51.81.51.10.6-0.3-1.3-1.8-1.9-1.6-0.80.51.62.2

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 (5,6,7,8)
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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.