Sunday, July23, 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 6:31AMSunset 8:27PM Sunday July 23, 2017 2:56 AM EDT (06:56 UTC) Moonrise 5:43AMMoonset 7:46PM 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- 1222 Am Edt Sun Jul 23 2017
Tonight..SW winds 15 to 20 kt, diminishing to 15 kt late. Seas 3 to 4 ft.
Sun..SW winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers and tstms.
Sun night..SW winds 15 kt. Seas 3 to 4 ft. A slight chance of showers and tstms.
Mon..SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Mon night..SW winds 15 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Tue..SW winds 10 to 15 kt. Seas 3 ft. A chance of showers and tstms.
Tue night..S winds 10 to 15 kt, becoming sw 5 to 10 kt after midnight. Seas 2 to 3 ft. A chance of showers and tstms.
Wed..S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..S winds 5 to 10 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..SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1222 Am Edt Sun Jul 23 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will continue to extend west into the southeast coast this weekend. A weak cold front will approach the area during the middle of next week. Low pressure should then develop over the area and linger through late 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 230527
afdchs
area forecast discussion
national weather service charleston sc
127 am edt Sun jul 23 2017

Synopsis
Atlantic high pressure will continue to extend west into the
southeast coast this weekend. A weak cold front will approach
the area during the middle of next week. Low pressure should
then develop over the area and linger through late week.

Near term until 6 am this morning
Skies will be mostly clear overnight with dry weather expected.

Other than a little ground fog in locations where it rained on
Saturday, there is likely too much mixing and unfavorable
condensation pressure deficits for anything more to occur by
daybreak Sunday.

It'll be warm and humid, with lows lower or middle 70s far
inland, closer to 80 on the barrier islands and in downtown
charleston.

Short term 6 am this morning through Tuesday
Sunday, the mid level pattern over the region will feature a broad
weakness, with a large ridge centered over the atlantic and another
ridge centered over the red river valley. However, low pressure is
expected to develop across the mid atlantic states, with the trough
remaining across the carolina foothills and piedmont. The pressure
gradient across the forecast area will slowly steepen through the
day, with gusty conditions expected across the marine zones and near
the coast. Forecast soundings indicate that the LFC will range
between 4-5 kft, with shallow CIN lingering into the late afternoon.

A slight increase in llvl moisture convergence should support
scattered thunderstorms inland, with slight chcs generally east of i-
95. Maximum temperatures should reach around 90 over the beaches to
the mid 90s across inland ga.

Monday, nam12 shows a mid level low and sfc low passing north of the
coastal zones during the morning hours. This feature appears much
weaker on the other short range models, I will favor the gfs. Using
a blend of temperature guidance, high temperatures are forecast to
range a degree or two below values reached sun. Dewpoints are
expected to remain in the low to mid 70s as a sfc trough remains
west of the region. Given the temperatures and dewpoints, any cin
should erode during the late afternoon hours. Short range guidance
indicates that a weak short wave is expected to ripple across the
forecast area during the late afternoon. Pops should range from 40
percent over ga and around 30 near the coast and coastal waters.

Tuesday, the 12z GFS indicates that the axis of deep moisture will
shift across the CWA during the daylight hours. Pw values are
forecast to increase to around 2.3 inches. Features across the
forecast area will remain limited to broad mid level trough with low
pressure across the southern appalachian mountains. Provided
generally weak forcing and tall and thin instability, I will keep
pops limited to high chc.

Long term Tuesday night through Saturday
An unsettled weather pattern will persist through mid week while
southwest flow advects deep moisture to the region ahead of a cold
front approaching from the north northwest. The cold front should
struggle to push south into the region, likely stalling just north
of the area as its parent mid upper lvl trough of low pressure
shifts off the northeast coast. However, weak low pressure should
develop near the stalled boundary on Wednesday and persist through
late week until a second mid upper lvl trough shifts over the
northeast and gradually amplifies, forcing some mid-lvl energy over
the mid atlantic and southeast states late week. The pattern
suggests at least chances of showers and thunderstorms each day with
greatest coverage occurring during peak diurnal heating hours. Temps
will generally peak around normal mid week, but could approach the
mid 90s by the upcoming weekend. Overnight lows will range in the
mid 70s.

Aviation 06z Sunday through Thursday
MainlyVFR through 06z Monday. However, there is at least some
chance that shra tsra could impact kchs and or ksav on Sunday,
with a risk of temporary flight restrictions. At this point,
still enough uncertainty to include vcts cb, models showing
ksav may stand a better chance than kchs given it's vcnty to
deeper moisture.

Extended aviation outlook: afternoon showers thunderstorms could
provide brief flight restrictions each day. However, greatest
chances of flight restrictions should occur on Wednesday as a cold
front stalls just north of the area. Otherwise,VFR conditions will
prevail.

Marine
Overnight: SW winds will be as high as 15 or 20 kt, before
dropping off some late as weak land breeze circulations develop.

Seas will average 3 or 4 ft.

Sunday through Thursday, broad high pressure will remain across the
western atlantic as low pressure remain inland. Low pressure may
deepen across the mid atlantic states late Sunday into Monday. A
steeper pressure gradient should support gusty SW winds Sunday and
Monday afternoon and evening, gusts may near 25 kts. Conditions are
expected to remain below small craft advisory criteria. Low pressure
will gradually settle over the southern appalachians Monday and
Tuesday, shifting over the ga sc coastal waters by late Wednesday.

Winds should weaken and shift from the se. Thunderstorm coverage is
forecast to increase each day through Wednesday.

Tides coastal flooding
Tides will remain elevated into early next week due to the lunar
perigee and new moon. Additional coastal flooding advisories
are likely.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term... Ned
long term... Dpb
aviation...

marine...

tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 17 mi71 min Calm 80°F 1014 hPa77°F
41033 33 mi48 min WSW 16 G 21 82°F 85°F1014.3 hPa
CHTS1 44 mi44 min SSW 8 G 11 82°F 86°F1014.2 hPa
FPKG1 - 8670870 - Fort Pulaski, GA 45 mi44 min W 4.1 G 6 78°F 86°F1015 hPa
FBIS1 - Folly Island, SC 45 mi56 min SSW 18 G 21 82°F 1014.7 hPa (-0.9)78°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 mi60 minSSW 510.00 miFair80°F75°F87%1014.6 hPa
Walterboro Lowcountry Regional Airport, SC17 mi61 minSW 610.00 miFair77°F73°F89%1014.6 hPa
Beaufort County Airport, SC19 mi61 minSW 67.00 miFair79°F73°F84%1014.6 hPa

Wind History from NBC (wind in knots)
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Last 24hrW3SW5CalmSW3SW3W3SW4W4SW6Calm6SW63SW7SE8SE8S11
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1 day agoCalmCalmCalmCalmCalmCalmCalmSW5CalmSE3SE6S55SE6SE5S7S5S4S4S4S33S3S4
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalm43Calm4S6S5SW10CalmS4S5S3SW3W3W3Calm

Tide / Current Tables for Bluff Plantation, Combahee River, South Carolina
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Bluff Plantation
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Sun -- 12:24 AM EDT     4.37 feet High Tide
Sun -- 05:47 AM EDT     New Moon
Sun -- 06:31 AM EDT     Sunrise
Sun -- 06:36 AM EDT     -1.06 feet Low Tide
Sun -- 06:42 AM EDT     Moonrise
Sun -- 12:52 PM EDT     3.68 feet High Tide
Sun -- 06:48 PM EDT     -1.78 feet Low Tide
Sun -- 08:27 PM EDT     Sunset
Sun -- 08:46 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.34.33.62.61.3-0-0.9-1-0.40.61.82.83.53.73.32.41.1-0.3-1.5-1.8-1.2-01.52.9

Tide / Current Tables for Lobeco, Whale Branch, South Carolina
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Lobeco
Click for Map
Sun -- 04:13 AM EDT     -0.64 feet Low Tide
Sun -- 05:47 AM EDT     New Moon
Sun -- 06:31 AM EDT     Sunrise
Sun -- 06:43 AM EDT     Moonrise
Sun -- 10:17 AM EDT     8.47 feet High Tide
Sun -- 04:24 PM EDT     -1.03 feet Low Tide
Sun -- 08:27 PM EDT     Sunset
Sun -- 08:45 PM EDT     Moonset
Sun -- 10:40 PM EDT     10.01 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.55.22.70.5-0.6-0.21.43.65.97.68.48.275.12.70.5-0.9-0.80.83.36.18.49.79.9

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 (2,6,7,8)
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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.