Saturday, February17, 2018 L-36.com


Marine Weather and Tides
Thunderbolt, GA

Version 3.4
What's New / NOTES
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.
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 7:01AMSunset 6:13PM Saturday February 17, 2018 9:42 PM EST (02:42 UTC) Moonrise 8:13AMMoonset 8:02PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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- 930 Pm Est Sat Feb 17 2018
Tonight..S winds 10 to 15 kt, becoming sw. Seas 2 to 3 ft.
Sun..W winds 5 to 10 kt, becoming ne 10 to 15 kt in the afternoon. Seas 2 ft, building to 3 to 4 ft in the afternoon. Patchy fog in the morning. A slight chance of showers in the afternoon.
Sun night..E winds 5 to 10 kt. Seas 2 to 3 ft.
Mon..SE winds 5 kt. Seas 2 ft.
Mon night..SE winds 5 to 10 kt. Seas 2 ft.
Tue..SE winds 5 to 10 kt. Seas 2 ft.
Tue night..SE winds 10 kt. Seas 2 to 3 ft.
Wed..S winds 5 to 10 kt. Seas 3 to 4 ft.
Wed night..S winds 5 to 10 kt. Seas 3 to 4 ft.
Thu..S winds 5 to 10 kt. Seas 3 ft.
Thu night..SE winds 5 to 10 kt. Seas 3 ft.
AMZ300 930 Pm Est Sat Feb 17 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A stationary front will meander across the region into Sunday. The front will lift north Monday, followed by high pressure prevailing for most of next week. A cold front may approach 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 180006
afdchs
area forecast discussion
national weather service charleston sc
706 pm est Sat feb 17 2018

Synopsis
A stationary front will meander across the region into Sunday.

The front will lift north Monday, followed by high pressure
prevailing for most of next week. A cold front may approach
late next week.

Near term until 6 am Sunday morning
Goes-16 satellite imagery, webcams, coastal metars and a report
from an off-duty NWS employee at folly beach indicates that sea
fog is progressing onshore within a s-se flow associated with a
northward lifting warm front across the charleston tri-county
area. The fog will impact a good portion of charleston, coastal
colleton and beaufort counties, dependent upon how fast winds
veer to the sw. That should occur around 04-06z, which will act
to push the fog back into the atlantic. For now we have a
special weather statement in effect for the fog, with the
potential for a dense fog advisory from beaufort to charleston
county early tonight if the coverage of the fog becomes more
significant. We have lowered temps a couple of degrees in
locations where the fog will occur, but still anticipating lows
55-60f across the entire forecast area. There is still not
enough confidence to add fog to locations near the altamaha
river late tonight. We also adjusted sky cover to shrink the the
amount of clouds across our inland counties early tonight, and
to increase them along the coast early as per recent satellite
trends and due to the sea fog.

Previous discussion:
the surface front has nudged back to the north this afternoon
though currently still poking into the charleston tri-county
area. The boundary will continue to lift north through early
this evening, with weak southeast winds eventually transitioning
to southwest overnight. Another cold front will drop in from the
northwest late tonight. Limited moisture and forcing associated
with the front should yield little to no precipitation along the
leading edge so we maintained a dry forecast overnight. Fog
potential appears relatively low in most areas, though we could
see another area of fog develop south of the area late tonight
and drift north into our far southern ga zones around daybreak.

Guidance still keeps the greatest chance for fog just south of
our area so we have not included any fog in the afternoon
package.

Short term 6 am Sunday morning through Tuesday
The mid upper levels will consist of west southwest flow on Sunday.

The flow will turn more to the southwest on Monday as ridging
develops to our east, with a broad high centered east of fl. The
high ridge will strengthen amplify on Tuesday, turning our flow to
the south southwest. At the surface, a stationary front will hover
over or just south of the region Sunday as high pressure passes to
our north. The front will start to migrate north Sunday night as the
high shifts offshore. The front will advance northward as a warm
front on Monday, quickly moving north of our area and accelerating.

At the same time, atlantic high pressure will be building into our
area. The western periphery of the high will become more dominant
across the southeast on Tuesday. Pwat's across our area will be
~1.5" on Sunday, before falling to ~1" Monday and Tuesday. Despite
the front nearby or overhead on Sunday and Monday, there is not much
lift across our area. The result is a low probability of light
showers each of these two days, generally located around the
vicinity of the front. Tuesday a few showers are possible over
inland areas as weak impulses round the western periphery of the
high during the day. QPF will be minimal each day, if anything does
fall. Instability is very weak to nonexistent, so no thunderstorms
are forecasted. Temperatures will be above normal each day.

Temperatures will trend upwards Monday and Tuesday within generally
southerly flow. In fact, we won't be too far away from record highs
these two days.

Long term Tuesday night through Saturday
A large ridge of high pressure centered over the western atlantic
will be the primary contributor to the pattern over the southeast
united states, helping produce warm conditions into late week. In
general, temps will be well above normal, peaking into the upper
70s lower 80s Wednesday and Thursday afternoon. A few showers will
be possible inland during peak heating each day, with slightly
greater coverage and the potential for a few thunderstorms on
Thursday when mid-lvl energy approaches the western periphery of the
high. A few showers could linger into Thursday night as a weak cold
front approaches the area. Weak mid-lvl energy should then traverse
the southeast within a zonal flow this weekend, potentially
producing a few showers and slightly cooler conditions.

Aviation 00z Sunday through Thursday
Kchs: a widespread region of low stratus and sea fog will
continue to advance n-nw and will impact the terminal early
tonight, resulting in ifr or potential lifr conditions. As the
flow veers more SW overnight there will be some improvement in
conditions as the fog stratus begins to push back toward the
ocean. Low endVFR should return behind a cold front late
tonight and Sunday, although MVFR is still a possibility.

Ksav:VFR is expected to prevail tonight, before MVFR and
possible ifr ceilings develop early Sunday and persist through
the entire day as a cold front pushes through and stalls to the
south.

Extended aviation outlook: a stationary front could bring flight
restrictions Monday.

Marine
Tonight: sea fog will continue to cover all of the sc atlantic
waters early tonight, before coverage starts to shrink overnight
as the flow veers more SW and eventually W and speeds increase.

Until then we have a dense fog advisory for amz350-352 and also
for charleston harbor. A 646 pm report from the charleston
pilots in downtown charleston indicated that fog was rolling
into the harbor, and that that the channel into and out of the
harbor was closed due to the fog until further notice. Fog over
the ga waters is less in areal coverage and will diminish before
midnight as the flow veers to the SW and shunts the fog ne.

Regarding winds and seas, we have backed winds to more SE and s
early on as a warm front lifts northward through the charleston
waters, and gradually all waters will clock around to the sw,
with even some more w'erly toward daybreak in advance of a cold
front. Speeds on average will be 10 or 15 kt, with seas
generally no higher than 2 or 3 ft.

Sunday through Thursday: a stationary front will meander across the
region Sunday. The front will lift north Monday, followed by
atlantic high pressure prevailing for most of next week. Expect a
brief increase in winds across the sc waters Sunday due to a
modifying pressure gradient, but nothing that would warrant marine
headlines. Winds will then ease Sunday night. Wind directions will
also change into Monday with the shifting front, then becoming more
stable in direction afterwards with high pressure. Overall, no
significant winds or waves are forecasted through next Thursday.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Dense fog advisory until 1 am est Sunday for amz330-350-352.

Near term...

short term... Ms
long term... Dpb
aviation...

marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi42 min SW 7 G 8 61°F 58°F1020.3 hPa (+0.4)
41033 37 mi34 min SSW 9.7 G 14 54°F 56°F1022.9 hPa
SAXG1 - Sapelo Island Reserve, GA 45 mi42 min S 6 63°F 1021 hPa (+1.0)62°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi52 min S 12 G 14 61°F 58°F2 ft1020.2 hPa (+0.3)61°F
ACXS1 - ACE Basin Reserve, SC 47 mi57 min S 1 58°F 1020 hPa58°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 mi46 minSW 610.00 miFair64°F62°F92%1019.6 hPa
Savannah-Hilton Head International Airport, GA11 mi49 minSSW 510.00 miFair67°F60°F79%1019.8 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi47 minSSW 610.00 miFair59°F59°F100%1020 hPa

Wind History from SVN (wind in knots)
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Last 24hrSW5SW3S3SW4CalmSW3CalmCalmW3CalmCalmE4E8E7SE4S6S8SE8S9S9S4CalmS3SW6
1 day agoW3SW5SW3SW3SW3SW5SW5SW6SW6SW5W10W7SW9W10
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2 days agoCalmCalmCalmCalmCalmCalmSW3CalmSW4S4CalmW6SW6SW5W8W6NW7W6W7W9SW5S6SW4SW6

Tide / Current Tables for Thunderbolt, Wilmington River, Georgia
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Thunderbolt
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Sat -- 03:07 AM EST     -0.37 feet Low Tide
Sat -- 07:04 AM EST     Sunrise
Sat -- 08:13 AM EST     Moonrise
Sat -- 09:33 AM EST     8.19 feet High Tide
Sat -- 03:37 PM EST     -0.46 feet Low Tide
Sat -- 06:12 PM EST     Sunset
Sat -- 08:02 PM EST     Moonset
Sat -- 09:42 PM EST     7.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.22.20.5-0.40.11.63.65.77.28.18.17.25.63.51.3-0.2-0.40.72.74.86.67.67.87

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Sat -- 12:31 AM EST     -1.93 knots Max Ebb
Sat -- 03:53 AM EST     0.00 knots Slack
Sat -- 06:32 AM EST     2.19 knots Max Flood
Sat -- 07:03 AM EST     Sunrise
Sat -- 08:12 AM EST     Moonrise
Sat -- 10:12 AM EST     -0.00 knots Slack
Sat -- 01:13 PM EST     -2.14 knots Max Ebb
Sat -- 04:24 PM EST     0.00 knots Slack
Sat -- 06:11 PM EST     Sunset
Sat -- 06:55 PM EST     2.27 knots Max Flood
Sat -- 08:01 PM EST     Moonset
Sat -- 10:26 PM EST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.9-1.9-1.6-10.11.32.12.11.610.2-0.9-1.8-2.1-2-1.6-0.60.81.92.31.91.20.4-0.6

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 (21,6,7,8)
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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.