Saturday, June24, 2017 L-36.com


Marine Weather and Tides
Meggett, SC

Version 3.4
What's New / NOTES
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 6:11AMSunset 8:32PM Saturday June 24, 2017 1:29 AM EDT (05:29 UTC) Moonrise 5:52AMMoonset 8:10PM Illumination 0% Phase: New Moon; Moon at 0 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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AMZ330 Charleston Harbor- 1213 Am Edt Sat Jun 24 2017
Rest of tonight..SW winds 15 kt, except 15 to 20 kt near the harbor entrance. Waves 1 to 2 ft near the harbor entrance.
Sat..SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Waves 1 to 2 ft. A slight chance of showers and tstms in the afternoon.
Sat night..SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Waves 1 to 2 ft. A chance of showers and tstms in the evening, then showers and tstms likely after midnight.
Sun..SW winds 5 to 10 kt. Showers and tstms likely.
Sun night..W winds 5 kt. Showers and tstms likely.
Mon..N winds 5 kt, becoming E in the afternoon. Showers and tstms likely, mainly in the morning.
Mon night..SE winds around 5 kt, becoming W after midnight. A chance of showers and tstms.
Tue..N winds 5 kt. A chance of showers and tstms.
Tue night..NE winds 5 kt.
Wed..NE winds 5 to 10 kt.
Wed night..E winds 5 to 10 kt. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 83 degrees.
AMZ300 1213 Am Edt Sat Jun 24 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will gradually move through the area this weekend, moving off the coast Monday. Drier high pressure will build in from the northwest for much of next week before moving offshore late week.

7 Day Forecast for Marine Location Near Meggett, SC
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location: 32.7, -80.28     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 240441
afdchs
area forecast discussion
national weather service charleston sc
1241 am edt Sat jun 24 2017

Synopsis
A cold front will gradually move through the area this weekend,
moving off the coast Monday. Drier high pressure will build in
from the northwest for much of next week before moving offshore
late week.

Near term until 6 am this morning
A warm, humid night is in progress. Strengthening nocturnal
jetting is keeping the boundary layer well mixed and temperature
have been stubborn to fall over the past few hours. Nudged
overnight lows up a degree for many locations. Coastal locations
will be hard pressed to drop out of the lower 80s, especially at
the beaches where breezy conditions are ongoing.

Short term 6 am this morning through Monday
A broad upper trough will persist across the central united
states while a cold front gradually sinks southeast into the
area. Most of the upper shortwave energy will remain to the
northwest of the area Saturday into Sunday. However, deep
tropical moisture will spread across the area with precipitable
water values 2.0-2.2" during the period.

Given the deep wsw flow in the lowest 500 mb of the atmosphere
on Saturday, the morning will be mostly dry. The best chance for
precipitation will come later in the afternoon as the cold
front begins to approach. We held the pops until the latter half
of the afternoon with the highest values farther inland. The
ensuing morning subsidence should allow for considerable
sunshine and the development of moderate surface-based
instability. 0-6 km bulk shear vectors increase to around 25 kt
late in the afternoon farther inland with capes 2500-3000 j kg.

Some organized thunderstorms may move into our area late in the
afternoon or during the evening with at least some damaging wind
potential.

The cold front will stall out along our coast on Sunday while
deep moisture persists. Greater cloud cover in the morning
should somewhat limit instability, and with the greatest upper
forcing remaining to the northwest, convergence will primarily
be driven by the nearby cold front. Fairly good coverage of
showers and tstms expected, especially closer to the coast.

Low to mid 60s dewpoints are progged to move into inland areas
on Monday as drier high pressure gradually builds southeast. The
front will slowly drift southeast, though sticking around long
enough to maintain at least isolated showers and tstms over
coastal areas and the adjacent atlantic waters.

Long term Monday night through Friday
Monday night the cold front will be offshore of our area,
dissipating as it moves further away. Meanwhile, high pressure
from the central u.S. Will gradually be building towards our
area. The high is expected to pass north of our area Wednesday,
then move offshore Thursday. Dry conditions are expected for
most of the land area. The only shower threat appears to be over
the coastal waters each night and maybe along portions of the
immediate coast. Temperatures will be slightly below normal
through Wednesday, then creeping up on Thursday.

Aviation 06z Saturday through Wednesday
Vfr for much of the period, although shower TSTM probabilities
will increase after 00z. Latest cams are a bit slower to bring
showers tstms into the ksav-kchs corridor, but think by 00z
activity will be in the area. Latest guidance suggests kchs may
have a better chance for impacts so will go ahead and introduce
a tempo group from roughly 00-03z for MVFR in tsra. Timing is a
bit more uncertain at ksav with the better forcing progged to
pass by to the north, so will leave any mention of tstms out of
that TAF for now. This will be reevaluated with the 12z taf
cycle.

Extended aviation outlook: periods of flight restrictions are
expected late Saturday into Monday due to a cold front slowly
moving through the area.

Marine
Tonight: atlantic high pressure will hang on to the east while
the remnants of tropical cyclone cindy move northeast toward the
mid-atlantic region. This will set up a pressure pattern
favorable for increasing south southwest winds, generally
highest across the charleston county waters where the best
gradient jetting is likely. Think winds will gust near 25 kt
across this area along with seas building to 6 ft toward 20 nm
offshore and thus an advisory will remain in effect for this
area. Conditions will be close to advisory thresholds elsewhere
as well but confidence in coverage duration of criteria is low.

Saturday, a tightening gradient ahead of a cold front will
maintain 25 kt gusts and 6 ft seas over portions of the
charleston nearshore. Thus a small craft advisory persists
through Saturday evening. Our forecast wind gusts in charleston
harbor for Saturday afternoon are currently just shy of small
craft advisory given gusts of 22-23 kt when the sea breeze
enhances the existing flow.

Winds and seas will diminish considerably later Saturday night
through the middle of next week as the cold front drops south
and high pressure gradually expands southeast.

Rip currents: the combination of breezy conditions in the surf
zone and influences from the new moon, lunar perigee and ongoing
elevated tides will support a moderate risk for rip currents
through Saturday. An elevated risk for rip currents will be
possible again Sunday.

Tides coastal flooding
Tides will continue to run a little high through Monday due to
various astronomical influences. Fortunately the wind directions
are not very conducive to much surge so we still might only
barely touch 7 ft mllw at charleston harbor during some of the
evening tides.

Climate
Record high minimums for 24 june:
kchs 79 2016.

Kcxm 85 1998.

Ksav 79 1932.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until 2 am edt Sunday for amz350.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 13 mi104 min S 1 81°F 1017 hPa76°F
CHTS1 20 mi41 min SSW 9.9 G 15 81°F 83°F1016.6 hPa
FBIS1 - Folly Island, SC 21 mi29 min SSW 24 G 26 82°F 1017 hPa (+0.6)76°F
41033 30 mi81 min SSW 18 G 23 82°F 83°F1016.4 hPa
41029 - Capers Nearshore (CAP 2) 35 mi81 min SSW 21 G 27 86°F 83°F1015.6 hPa
FPKG1 - 8670870 - Fort Pulaski, GA 57 mi41 min SSW 11 G 15 81°F 84°F1016.9 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC15 mi34 minSSW 10 G 1710.00 miOvercast81°F75°F84%1016.6 hPa
Charleston, Charleston Air Force Base, SC20 mi33 minSSW 1310.00 miPartly Cloudy80°F73°F79%1016 hPa
Walterboro Lowcountry Regional Airport, SC24 mi34 minS 710.00 miFair77°F73°F89%1016.3 hPa

Wind History from JZI (wind in knots)
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Last 24hrS10S9S9S7
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1 day agoCalmS3CalmCalmCalmCalmS5S6S5S8S8S7SW7S7S10S9S9S6S7S5S7S6S7S9
2 days agoCalmCalmNW5
G17
CalmCalmCalmCalmCalmN6N4N6N6N6NE4E6CalmE8E6NE5CalmNE4CalmCalmS4

Tide / Current Tables for Lower Toogoodoo Creek, 2 mi. above entrance, South Carolina
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Lower Toogoodoo Creek
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Sat -- 03:39 AM EDT     -0.74 feet Low Tide
Sat -- 06:14 AM EDT     Sunrise
Sat -- 06:52 AM EDT     Moonrise
Sat -- 10:22 AM EDT     7.08 feet High Tide
Sat -- 03:45 PM EDT     -1.27 feet Low Tide
Sat -- 08:32 PM EDT     Sunset
Sat -- 09:10 PM EDT     Moonset
Sat -- 10:49 PM EDT     8.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.23.71.3-0.4-0.70.21.83.55.16.476.85.53.31-0.8-1.2-0.41.43.75.87.58.78.9

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sat -- 12:15 AM EDT     -3.41 knots Max Ebb
Sat -- 03:23 AM EDT     0.00 knots Slack
Sat -- 05:36 AM EDT     1.87 knots Max Flood
Sat -- 06:12 AM EDT     Sunrise
Sat -- 06:50 AM EDT     Moonrise
Sat -- 09:20 AM EDT     -0.00 knots Slack
Sat -- 12:31 PM EDT     -3.00 knots Max Ebb
Sat -- 03:25 PM EDT     0.01 knots Slack
Sat -- 05:59 PM EDT     2.34 knots Max Flood
Sat -- 08:31 PM EDT     Sunset
Sat -- 09:09 PM EDT     Moonset
Sat -- 09:56 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-3.4-3.1-2-0.60.81.71.81.51.20.4-0.8-2-2.9-2.9-2-0.60.822.32.11.81.2-0.1-1.6

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 (1,6,7,8)
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Ground Weather Radar Station Charleston, SC
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weather_mapweather_map weather_map

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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.