Monday, August21, 2017 L-36.com


Marine Weather and Tides
Bluffton, SC

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 6:50AMSunset 8:01PM Monday August 21, 2017 11:24 PM EDT (03:24 UTC) Moonrise 5:36AMMoonset 7:08PM Illumination 0% Phase: New Moon; Moon at 29 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- 925 Pm Edt Mon Aug 21 2017
Rest of tonight..S winds 5 kt. Seas 2 ft. A slight chance of showers and tstms.
Tue..S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 2 ft. A slight chance of showers and tstms.
Tue night..S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Wed..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Thu..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Thu night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Fri..NE winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Fri night..NE winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Sat..NE winds 15 kt. Seas 4 to 6 ft. A slight chance of showers and tstms.
Sat night..NE winds 10 to 15 kt. Seas 4 to 6 ft. A slight chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 925 Pm Edt Mon Aug 21 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will extend across the area Tuesday and Wednesday with a piedmont trough developing inland. A stronger cold front is expected to pass over the region on Thursday. A wave of low pressure could form on the front well offshore Friday. Slightly cooler and drier conditions are then expected into early next week.

7 Day Forecast for Marine Location Near Bluffton, SC
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location: 32.24, -80.85     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 220134
afdchs
area forecast discussion
national weather service charleston sc
934 pm edt Mon aug 21 2017

Synopsis
High pressure will extend across the area Tuesday and Wednesday
with a piedmont trough developing inland. A stronger cold front
is expected to pass over the region on Thursday. A wave of low
pressure could form on the front well offshore Friday. Slightly
cooler and drier conditions are then expected into early next
week.

Near term until 6 am Tuesday morning
Convection has ended across the entire area. Have kept trend of
gradually bringing back pops, first over the atlantic, then
toward the coast late tonight and early Tuesday morning. Given
the relatively widespread convection rainfall earlier today,
think the chance for at least patchy fog has increased. Many
areas are already at their dewpoint temperatures. Have slightly
increased the area of patchy fog to include much of the land
area by 08z tonight. As mentioned before, temperatures are
expected to remain steady of fall slightly into the mid 70s across
most locations, except around 80 close to the coast.

Short term 6 am Tuesday morning through Thursday
Tuesday: broad ridging and associated surface high pressure
will remain over the forecast area Tuesday but will begin to
weaken and shift south and east as a longwave trough moves east
towards the appalachians. Locally, models are in reasonable
agreement that showers and thunderstorms should initiate
primarily due to the seabreeze before expanding inland. High
temperatures are expected to range from the upper 80s across the
beaches to the low to mid 90s across the inland counties.

Wednesday: the upper level trough will attempt to phase lock
with surface low pressure over eastern canada, with resultant
strengthening causing the trough to extend south and bring a
surface cold front towards the forecast area. Lowering heights
suggest another day with fair coverage of showers and
thunderstorms, probably better coverage than Tuesday.

Temperatures are expected to be nearly the same if not a degree
or so warmer.

Thursday: the surface cold front is expected to cross through
the forecast area during the day Thursday. Forcing provided by
the front, combined with ample moisture and widespread weak to
moderate instability suggests the precipitation coverage will be
greatest during this period. High temperatures should range
around 90 degrees for most areas Thursday afternoon before a
slightly cooler overnight period relative to previous days under
weak cold air advection.

Long term Thursday night through Monday
Friday through Monday: high pressure sourced from canada will
remain centered well north of the region through the rest of the
week. Confidence in the day 5 through 7 forecast remains low.

Medium range guidance indicates that the sfc high center will
shift over new england, ridging SW across the carolinas into ga.

In addition, both the GFS and ECMWF show a coastal low
developing off the ga sc coast by late this week, with run to
run trends shifting east. Guidance supports prolonged NE winds
across the cwa, yielding afternoon dewpoints in the upper 60s
inland by the weekend. I will favor the marine and near shore
zones for chc pops through much of the day 4 through 6 period. I
will keep the forecast dry for day 7, indicating the best
chance for drier air to arrive on the west side of the departing
coastal low.

Aviation 01z Tuesday through Saturday
Tonight: expectVFR to prevail both sites. Once again, meso-
scale models indicating the threat for isolated to scattered
showers or even a thunderstorm to possibly approach both sites
later after 08z. Confidence not high enough to put in taf, but
will continue to monitor. Guidance also indicating the potential
for some light patchy fog. Have kept mention in for ksav, and
may need to add for kchs.

Extended aviation outlook: brief restrictions are possible due
to direct impacts from showers thunderstorms, most probable
during the afternoon and early evening.

Marine
Tonight: no highlights or significant updates this evening.

High pressure to the east will keep light winds of 10 knots or
less and seas 2 to 3 feet or less. Expect scattered showers and
thunderstorms to redevelop later tonight and early Tuesday
morning.

Tuesday through Thursday: atlantic high pressure with a weak
surface pressure gradient will persist over the coastal waters
into mid- week. A cold front is expected to sweep across the
forecast area on Thursday. During this period, winds will
generally range from SE to SW with speeds 5 to 15 knots, with
some gusts to near 20 knots. Seas will range 2 to 4 feet.

Friday through Saturday: large high pressure centered over the
great lakes will build over the region Friday into Saturday. In
addition, a coastal low may develop off the ga and sc coast by
Friday and may slowly depart on Saturday. Winds should shift
from the ne, increasing to 10 to 15 kts by Friday afternoon.

Four foot wave are forecast across portions of amz350 and
possibly beyond 20 nm offshore. On Saturday, NE winds are
forecast to strengthen to 15 to 20 kts, gusts between 20 to 25
kts. Wave heights are expected to range from 4 to 6 feet with 20
nm, reaching 7 feet across amz374.

Rip currents... The combination of swell, onshore flow, and
astronomical influences will lead to an enhanced environment for
rip currents through at least Tuesday, so the moderate risk has
been extended through tomorrow.

Tides coastal flooding
Rest of tonight: tide levels made it to 6.95 feet mllw, just
shy of the threshold for minor coastal flooding of 7 feet mllw.

Therefore, have discontinued the coastal flood advisory for the
sc coast this evening.

Astronomical influences and onshore winds (albeit light) will
continue to produce elevated tides through Tuesday. Only small
tidal departures are necessary to reach shallow coastal flooding
levels with the evening high tides along parts of the sc coast.

A coastal flood advisory has been issued for the sc coast
Tuesday evening. For now it looks like conditions will stay just
below any advisory thresholds on the ga coast and in jasper
county.

Equipment
The kclx radar continues to be down due to lighting strikes.

Parts are on order but the radar is not expected to return to
service until Tuesday afternoon at the earliest.

The temperature and dew point sensors at the downtown
charleston observation site (kcxm) could periodically fail.

Technicians plan on fixing the problem.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Bsh rfm
short term... Jmc
long term... Ned
aviation... Bsh jmc
marine... Bsh jmc
tides coastal flooding...

equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 14 mi54 min ENE 4.1 G 6 82°F 87°F1021.3 hPa
41033 23 mi76 min SSE 5.8 G 9.7 83°F 1020.5 hPa
ACXS1 - ACE Basin Reserve, SC 30 mi99 min Calm 76°F 1021 hPa75°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 58 mi94 min SE 5.8 G 7.8 81°F 85°F2 ft1020 hPa (+0.4)75°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, SC8 mi29 minSE 410.00 miFair81°F78°F94%1021 hPa
Beaufort County Airport, SC17 mi29 minNE 67.00 miFair77°F75°F94%1021 hPa
Beaufort, Marine Corps Air Station, SC18 mi28 minN 510.00 miOvercast78°F77°F97%1021 hPa
Savannah-Hilton Head International Airport, GA20 mi31 minN 010.00 miMostly Cloudy76°F73°F94%1021 hPa
Hunter U. S. Army Airfield, GA22 mi26 minSE 310.00 miOvercast78°F74°F91%1020 hPa

Wind History from HXD (wind in knots)
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Last 24hr5Calm3CalmCalmCalm--N5N5NE5NE5NE7NE10NE10E4E4E4E4CalmCalmNE6N6Calm4
1 day agoCalmS4S3SW5CalmCalmCalmSE8S5--S5SE5SE5SE5S10S10SE6SE6SE6SE6SE5SE44S5
2 days agoSW7SW7SW5SW6SW5CalmCalmCalmW6SW5SW4SE6S10S12--S12S12S10S6S6S7S766

Tide / Current Tables for Bluffton, May River, South Carolina
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Bluffton
Click for Map
Mon -- 03:02 AM EDT     -0.36 feet Low Tide
Mon -- 06:35 AM EDT     Moonrise
Mon -- 06:51 AM EDT     Sunrise
Mon -- 09:19 AM EDT     8.87 feet High Tide
Mon -- 02:31 PM EDT     New Moon
Mon -- 03:17 PM EDT     -0.76 feet Low Tide
Mon -- 08:00 PM EDT     Sunset
Mon -- 08:07 PM EDT     Moonset
Mon -- 09:42 PM EDT     9.97 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.22.70.5-0.40.21.94.26.488.88.67.45.42.90.6-0.7-0.41.23.76.38.49.79.99

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Mon -- 12:45 AM EDT     -2.54 knots Max Ebb
Mon -- 03:25 AM EDT     0.01 knots Slack
Mon -- 06:01 AM EDT     2.04 knots Max Flood
Mon -- 06:36 AM EDT     Moonrise
Mon -- 06:51 AM EDT     Sunrise
Mon -- 09:37 AM EDT     -0.00 knots Slack
Mon -- 01:07 PM EDT     -2.46 knots Max Ebb
Mon -- 02:31 PM EDT     New Moon
Mon -- 03:37 PM EDT     0.01 knots Slack
Mon -- 06:21 PM EDT     2.55 knots Max Flood
Mon -- 08:00 PM EDT     Sunset
Mon -- 08:07 PM EDT     Moonset
Mon -- 10:03 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.4-2.5-1.9-0.60.81.821.91.50.7-0.5-1.5-2.1-2.5-2.2-10.61.92.52.52.11.30.1-1.2

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 (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.