Sunday, September24, 2017 L-36.com


Marine Weather and Tides
Yemassee, 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 7:11AMSunset 7:17PM Sunday September 24, 2017 4:44 AM EDT (08:44 UTC) Moonrise 10:15AMMoonset 9:19PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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- 321 Am Edt Sun Sep 24 2017
.small craft advisory in effect through Tuesday evening...
Today..NE winds 15 kt. Seas 5 to 7 ft, building to 6 to 8 ft this afternoon.
Tonight..NE winds 15 kt. Seas 6 to 8 ft.
Mon..N winds 10 to 15 kt. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the afternoon.
Mon night..N winds 10 kt. Seas 5 to 7 ft.
Tue..N winds 10 to 15 kt. Seas 4 to 6 ft.
Tue night..NW winds 10 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight.
Wed..NW winds 10 to 15 kt. Seas 3 to 4 ft.
Wed night..W winds 10 kt. Seas 2 ft.
Thu..W winds 5 to 10 kt. Seas 1 foot.
Thu night..W winds 5 to 10 kt. Seas 1 foot.
AMZ300 321 Am Edt Sun Sep 24 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through this weekend. The high will weaken and shift inland as hurricane maria tracks northward off the southeast u.s. Coast through the first half of next week. A cold front will approach the forecast area late next week.

7 Day Forecast for Marine Location Near Yemassee, SC
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location: 32.68, -80.74     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 240759
afdchs
area forecast discussion
national weather service charleston sc
359 am edt Sun sep 24 2017

Synopsis
High pressure will prevail through this weekend. The high will
weaken and shift inland as hurricane maria tracks northward off
the southeast u.S. Coast through the first half of next week. A
cold front will approach the forecast area late next week.

Near term through tonight
Pre-dawn: patches of high clouds were across the region early
this morning. The special 06z sounding from kchs indicated
a low level profile which does not appear as moist as the
previous couple of mornings with close to 20 knots of wind atop
the boundary layer. This suggests a diminished chance of low
stratus this morning and only some ground fog inland areas.

Today: quite a bit of mid level NVA on the west subsidence flank
of hurricane maria is forecast to develop across the forecast
area. We anticipate dry weather across the area today, with only
a very small risk for a couple spotty light showers with the
sea breeze along the altamaha river this afternoon. While only
scattered diurnal cumulus are expected, we should see an
increase in high cloud cover across the region associated with
a southerly 50 knot 250 mb jet atop the area. We did not alter
high temps today since high clouds are unlikely to thicken until
later in the day.

Tonight: dry weather will continue with high clouds more
prevalent across sc than over southern ga given the forecast
alignment of the upper jet segment and position of maria. No
fog concerns are foreseen at this time, given the boundary
layer gradient and wind fields. Lows in the mid to upper 60s,
lower 70s at the beaches and barrier islands.

Short term Monday through Wednesday
Dry high pressure will remain situated over the forecast area Monday
as hurricane maria travels north offshore. Models continue to show
pwats 0.25 to 0.5 inches below normal under subsidence sufficient
enough to preclude precipitation formation. Heights aloft could fall
slightly by late Tuesday as the core of hurricane maria potentially
becomes less symmetric in advance of an approaching trough. Ambient
moisture will also gradually rebound through this period. Under the
right conditions, some slightly increased probabilities of periodic
showers late Tuesday into Wednesday would appear warranted,
primarily across coastal sc and over the coastal waters nearest the
tropical system. That said, mostly dry conditions still appear
reasonable for the forecast area at this time. Above normal
temperatures will persist, with highs in the mid to upper 80s and
lows in the mid to upper 60s, around 70 at the beaches.

Long term Wednesday night through Saturday
Despite the presence of maria offshore, weak NVA under high pressure
should continue to help mitigate precipitation chances initially.

Chances for showers thunderstorms will increase later in the week
into early next weekend due to an approaching cold front. Guidance
continues to suggest that the front will cross the appalachians
Thursday into Friday, with passage through the forecast area likely
by early Saturday. Above average temperatures will persist in
advance of the front, with cooler temperatures and lower dewpoints
likely behind the front as cool high pressure builds back into the
area.

Aviation 08z Sunday through Thursday
Vfr conditions expected across kchs and ksav through the 06z
taf period. Winds are forecast to shift from the NE around
midnight and continue through Sunday. Deepening mixing and
momentum transfer should support low end gusts during the
daylight hours across sc, ksav should see less gust potential.

Extended aviation outlook: mainlyVFR conditions expected with low
probabilities for restrictions in the mornings due to fog.

Marine
The pressure gradient between high pressure over the great lakes
and hurricane maria will be sufficiently strong enough to
support 15-20 knots of northeast flow over much of our waters
through tonight. Winds will be strongest beyond 20 nm offshore
will typical diurnal variations closer to the land sea
interface. The bigger issue will be the building long period
swell from the offshore hurricane. We made little deviation from
6-8 ft seas near shore and 9-11 ft over outer ga waters.

Monday through Thursday: a prolonged period of small craft
advisories will continue due to high seas pushing into the waters
from offshore hurricane maria. Generally northerly winds may
occasionally tip NE and will remain 15 to 20 knots with some gusts
to 25 knots Monday into early Tuesday before backing NW late Tuesday
into early Wednesday. Latest guidance suggests seas will remain
above small craft advisory criteria through Wednesday afternoon or
evening.

Rip currents: swell from offshore hurricane maria will continue
to build at the beaches. This resulting in a high risk of rip
currents today. Due to the presence of hurricane maria offshore,
increased chances for life-threatening rip currents will
persist into mid-week.

Tides coastal flooding
Powerful surf created by offshore hurricane maria will drive
significant wave run-up, which could cause further beach erosion
this weekend into early next week. High surf advisories are in
effect today and Monday. Also, the potential for shallow salt
water flooding will persist through early next week around the
times of high tide, particularly along the south carolina coast.

Chs watches warnings advisories
Ga... High rip current risk through this evening for gaz117-119-139-
141.

High surf advisory until 8 pm edt Monday for gaz117-119-139-
141.

Sc... High rip current risk through this evening for scz048>051.

High surf advisory until 8 pm edt Monday for scz048>051.

Marine... Small craft advisory until 8 pm edt Tuesday for amz352.

Small craft advisory until 4 pm edt Wednesday for amz350-374.

Small craft advisory until 5 am edt Tuesday for amz354.

Near term...

short term... Jmc
long term... Jmc
aviation... Jmc
marine... Jmc
tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 17 mi60 min Calm 72°F 1015 hPa71°F
41033 33 mi37 min NE 12 G 16 79°F 1019.8 hPa
CHTS1 44 mi45 min N 8.9 G 12 76°F 81°F1014.8 hPa (-0.6)
FPKG1 - 8670870 - Fort Pulaski, GA 45 mi45 min NNE 6 G 8 77°F 81°F1014.7 hPa (-0.4)
FBIS1 - Folly Island, SC 45 mi45 min NNE 8.9 G 12 76°F 1015 hPa (-0.7)71°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Beaufort, Marine Corps Air Station, SC14 mi49 minNNE 510.00 miFair72°F71°F97%1014.8 hPa
Walterboro Lowcountry Regional Airport, SC17 mi70 minN 310.00 miFair66°F64°F94%1015.9 hPa
Beaufort County Airport, SC19 mi50 minN 67.00 miFair73°F71°F94%1014.6 hPa

Wind History from NBC (wind in knots)
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Last 24hrN5N4N4NE5NE6N5NE8NE96E6E8E5E10E8E7E4E4E4NE3NE3NE5NE5NE5NE5
1 day agoCalmCalmN3N4NE5N7N4E65E6NE5E4SE4E8NE4CalmCalmCalmCalmN5N4N6N4N4
2 days agoN3CalmCalmCalmCalmW43CalmCalmCalm4S5SE53N6SE3CalmN5CalmCalmCalmNW3NW3N4

Tide / Current Tables for Bluff Plantation, Combahee River, South Carolina
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Bluff Plantation
Click for Map
Sun -- 03:29 AM EDT     3.65 feet High Tide
Sun -- 07:12 AM EDT     Sunrise
Sun -- 09:20 AM EDT     1.15 feet Low Tide
Sun -- 11:14 AM EDT     Moonrise
Sun -- 04:01 PM EDT     3.75 feet High Tide
Sun -- 07:16 PM EDT     Sunset
Sun -- 09:55 PM EDT     1.65 feet Low Tide
Sun -- 10:19 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.22.93.33.63.63.32.72.11.51.21.21.62.22.83.33.63.83.63.32.82.21.81.71.8

Tide / Current Tables for Lobeco, Whale Branch, South Carolina
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Lobeco
Click for Map
Sun -- 12:50 AM EDT     8.32 feet High Tide
Sun -- 06:55 AM EDT     0.53 feet Low Tide
Sun -- 07:12 AM EDT     Sunrise
Sun -- 11:14 AM EDT     Moonrise
Sun -- 01:22 PM EDT     8.48 feet High Tide
Sun -- 07:16 PM EDT     Sunset
Sun -- 07:29 PM EDT     0.83 feet Low Tide
Sun -- 10:19 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
88.37.76.34.52.61.10.51.22.74.76.47.88.48.37.45.842.11123.75.5

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 (4,6,7,8)
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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.