Tuesday, December10, 2019
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Marine Weather and Tides
James, SC

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:10AMSunset 5:15PM Tuesday December 10, 2019 7:53 AM EST (12:53 UTC) Moonrise 4:18PMMoonset 5:27AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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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AMZ256 Coastal Waters From Murrells Inlet To South Santee River Sc Out 20 Nm- 344 Am Est Tue Dec 10 2019
Today..SW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog.
Tonight..SW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog in the evening. A chance of showers in the evening, then showers likely after midnight.
Wed..N winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Showers likely, mainly in the morning.
Wed night..NE winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft.
Thu..NE winds 20 to 25 kt. Seas 5 to 7 ft. A slight chance of showers through the day, then a chance of showers through the night.
Fri..E winds 15 to 20 kt, becoming S 10 to 15 kt. Seas 4 to 6 ft. Showers.
Sat..W winds 10 to 15 kt. Seas 4 to 5 ft. A chance of showers through the day.
AMZ200 344 Am Est Tue Dec 10 2019
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. SW winds are expected ahead of a cold front today. The cold front will cross the waters tonight, followed by strong high pressure, gusty ne winds, and large seas. Gradual improvement into the weekend is expected, as the high moves offshore and sw winds return.


7 Day Forecast for Marine Location Near James, SC
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location: 33.31, -79.68     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 101234 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 734 AM EST Tue Dec 10 2019

SYNOPSIS. Unseasonably warm conditions will prevail ahead of a cold front today. The cold front will push through the region tonight, with strong high pressure to build over the area Wednesday through Thursday. A low pressure system will impact the area late week, followed by a return to high pressure over the weekend into early next week.

NEAR TERM /THROUGH TONIGHT/. Today: We begin the day with temps significantly warmer than this time yesterday, with values that are already near or greater than the normal high. This is some 15-20F above climo, and is an indication that we're in store for an unseasonably warm December day.

In the big picture we find a broad mid and upper trough that covers southern Canada into the central and southern Plains of the United States, while a strong H5 5900 meter anticyclone is centered the northwest Bahamas. Our area lies within a deep southwest flow between these two large scale features. Meanwhile at the surface, a cold front that is aligned near the Appalachians as we begin the day, will be just upstream of our northwest tier by 00Z. Since the front is still outside the area through the day, we won't experience anything more than a few showers from Allendale County to Candler County after 4 or 5 pm.

The main weather story for today will be the unusually warm conditions in place ahead of the cold front. H85 temps climb to 13 or 14C, while H5 heights are as great as 5840-5850 meters. Both of these values are more than the 90th percentile for this time of year. Combined with the warm start, max temps will reach the upper 70s and lower 80s away from the immediate shoreline. These values will be near records for both the date and even for the warmest in the entire month of December (See CLIMATE section below). At the immediate coast, expect the marine influence to produce much cooler temperatures, and sea fog will lurking over or just offshore of the barrier islands.

Tonight: The cold front will be rather slow in passing through as it becomes oriented to the southwest flow aloft and continues to be impeded by deep ridging from Bermuda to Cuba. Plus the better dynamics will remain off to the north and northwest and the band of deep moisture that is along and behind the cold front shrinks with time. The front itself reaches near the coast by 04-06Z and then pushes into the ocean thereafter. Since the front is an ana-type cold front, the associated showers will occur mainly behind the front, with 40-50% PoP maintained in the forecast. While surface-based CAPE and instability is over the ocean, there is a little bit of elevated instability. Thus we can't rule out a little thunder and lightning in a few spots.

Sea fog will try to expand onshore prior to midnight, but as winds turn offshore late it would push any fog back offshore.

Warm conditions out ahead of the front will hold temps in the 60s through much of the night, but cold advection strengthens significantly late and continues into Wednesday morning. This results in actual lows that occur during the mid morning hours on Wednesday.

SHORT TERM /WEDNESDAY THROUGH FRIDAY/. Strong high pressure will build in from the west on Wednesday behind a departing cold front. Models have backed off on precipitation coverage with drier air moving in, so besides a few showers in the morning, the remainder of the day should be mostly dry. Temperatures really won't move too much throughout the day with ongoing cold advection and an abundance of cloud cover. It will be several degrees cooler than previous days. Lows Wednesday night will be near normal.

High pressure will become wedged down the east side of the Appalachians on Thursday, as a coastal trough develops offshore. A tight pressure gradient between these two features will result in gusty northeast winds, primarily along the coast where gusts around 30 mph will be common. Otherwise, increasing isentropic ascent could support a couple showers, but a good bit of dry air in the mid and upper levels should keep coverage fairly limited through the daytime hours. Forecast continues to feature 20-30% rain chances in the afternoon. Another cool day in the wedge regime with highs topping out in the mid 50s.

High pressure will weaken Thursday night into Friday as low pressure lifts northeast out of the Gulf of Mexico and passes over or near the area. There are still inconsistencies between models regarding timing and the exact track of the low, but regardless, it appears to be a wet day as precipitable water values surge to near 1.5 inches and coincides with favorable large scale forcing from upper divergence and vort energy. Rain chances have been increased to around 70% and will likely need to be increased again in future forecast packages assuming trends hold. Pockets of moderate to heavy rainfall will be possible. Given uncertainty in track of the low, temperature forecast is a bit tricky. Current forecast shows highs ranging from the mid 50s inland to low 60s at the coast.

LONG TERM /FRIDAY NIGHT THROUGH MONDAY/. Models are in decent agreement through the long term period. Low pressure and associated rainfall is expected to be exiting the area Friday night into Saturday. High pressure will return in its wake, with dry conditions expected for the latter half of the weekend and early next week. Temperatures will generally be above normal.

AVIATION /13Z TUESDAY THROUGH SATURDAY/. Satellite and observational trends, plus the latest guidance suggests that any flight restrictions will stay inland from KCHS this morning, but MVFR ceilings could brush KSAV through 15Z. Otherwise, VFR will prevail today into the first part of tonight before a cold front moves through and generates scattered -SHRA/SHRA, and MVFR or possible IFR conditions the last several hours of the 12Z TAF cycle. Gusty S-SW winds will peak around 20 kt, maybe even a little higher during the late morning and afternoon, with speeds getting a boost from the sea breeze.

Extended Aviation Outlook: Flight restrictions in ceilings could linger into Wednesday. Flight restrictions are then likely Thursday night through Friday as a low pressure system impacts the area. VFR is expected to return on Saturday.

MARINE. Today: The west-northwest periphery of extensive Atlantic high pressure will continue to hold back the next cold front from getting here . at least for the time being. S and SW winds will average 10 to 15 kt, with some higher gusts, while seas will be as large as 3 to 5 ft.

Tonight: It takes until after midnight before the front starts reaching the local waters, but it is past the entire marine area before daybreak Wednesday. S and SW winds of 10 to 15 kt ahead of the front will clock around to the W and drop several knots for a few hours as the isobar pattern becomes "baggy overnight. Winds then shift to the NW and increase a good 5 to 10 kt begins the front late. Seas will hold in the range of 3 to 5 ft. Showers and maybe even a couple of t-storms will occur in association with the front.

Sea Fog: Given the abnormally warm and humid air mass, conditions would appear favorable for sea fog. However, there is too much wind in the mixed layer today, so our latest forecast is showing just patchy fog. Winds will drop off enough for several hours prior to the frontal passage between about 11 pm and 3 am. This would be the prime time for any significant sea fog to occur. We have areas of dense fog in the forecast to account for this. As winds shift offshore in direction late the fog potential diminishes quickly before sunrise Wednesday.

Wednesday through Sunday: Marine conditions will deteriorate Wednesday into Thursday as strong high pressure builds into the area. We have issued Small Craft Advisories for all of the coastal waters due to increasing northeast winds and building seas. An Advisory is likely for the Charleston Harbor at some point as well, however it appears winds will not reach criteria until Wednesday night, so have held off on issuing for now. The worst conditions across the waters will occur late Wednesday night through Thursday, when gale-force gusts will be possible. Gale Watches and/or Warnings could be needed for at least portions of the waters. Conditions will improve on Friday, although advisories will persist as seas take a bit longer to subside. Low pressure will pass over or near the waters late week into early weekend, followed by a return to high pressure. No additional concerns are expected at this time.

TIDES/COASTAL FLOODING. Elevated tide cycles are expected late week due to increasing astronomical influences with the full moon on Thursday and strong northeasterly winds. Minor to moderate coastal flooding will be possible with the morning high tides Thursday through Saturday. Coastal Flood Advisories could be required. Also of note, if significant rainfall occurs around the morning high tides Friday and Saturday, the potential for flooding of poor drainage areas could increase along the coast.

CLIMATE. Record Maximum Temps for the month of December . KCHS . 83F set on December 11, 1972. KSAV . 83F, set multiple times, the last on December 24, 2015.

Record Maximum Temps December 10th . KCHS . 82F set in 1972. KCXM . 79F set in 1943. KSAV . 82F set in 1972.

Record High Minimum Temp December 10th . KCXM . 62F last set in 2012.

EQUIPMENT. KCLX will remain down until further notice.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from noon Wednesday to 4 PM EST Friday for AMZ352-354. Small Craft Advisory from noon Wednesday to 4 PM EST Saturday for AMZ374. Small Craft Advisory from 7 AM Wednesday to 4 AM EST Saturday for AMZ350.

NEAR TERM . SHORT TERM . SPR LONG TERM . AVIATION . MARINE . TIDES/COASTAL FLOODING . CLIMATE . EQUIPMENT .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NIWS1 - North Inlet-Winyah Bay Reserve, SC 26 mi68 min SSW 6 63°F 1017 hPa61°F
41029 - Capers Nearshore (CAP 2) 35 mi45 min WSW 5.8 G 9.7 58°F 56°F1019.5 hPa
CHTS1 39 mi53 min SSW 6 G 8 64°F 57°F1018.6 hPa (+0.4)
FBIS1 - Folly Island, SC 45 mi53 min SW 6 G 7 60°F 1019.3 hPa (+0.7)60°F
MROS1 - 8661070 - Springmaid Pier, SC 47 mi53 min 57°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Georgetown County Airport , SC19 mi58 minSSW 610.00 miFair63°F60°F94%1018.6 hPa
Moncks Corner Berkeley County, SC21 mi78 minSW 77.00 miOvercast64°F62°F94%1017.6 hPa

Link to 5 minute data for KGGE

Wind History from GGE (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmS4S5S3S4SW4S8S6S4SW5S8SW5SW6SW5S5SW3S6S5
1 day agoN6NE5NE6N4N7N6N7N6N6N4N5N4N3CalmN4CalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoN4N6NE9E9
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Tide / Current Tables for Jamestown Bridge, Santee River, South Carolina
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Jamestown Bridge
Click for Map
Tue -- 05:26 AM EST     Moonset
Tue -- 06:33 AM EST     0.04 feet Low Tide
Tue -- 07:11 AM EST     Sunrise
Tue -- 10:36 AM EST     1.28 feet High Tide
Tue -- 04:17 PM EST     Moonrise
Tue -- 05:11 PM EST     Sunset
Tue -- 07:10 PM EST     0.13 feet Low Tide
Tue -- 10:55 PM EST     1.08 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.80.70.50.30.10.10.10.40.91.21.31.21.10.90.70.50.30.20.10.30.711.1

Tide / Current Tables for Pleasant Hill Landing, Santee River, South Carolina
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Pleasant Hill Landing
Click for Map
Tue -- 03:55 AM EST     0.09 feet Low Tide
Tue -- 05:25 AM EST     Moonset
Tue -- 07:10 AM EST     Sunrise
Tue -- 08:45 AM EST     2.56 feet High Tide
Tue -- 04:17 PM EST     Moonrise
Tue -- 04:32 PM EST     0.30 feet Low Tide
Tue -- 05:10 PM EST     Sunset
Tue -- 09:04 PM EST     2.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.80.50.20.10.41.21.92.42.62.42.11.81.30.90.50.30.40.81.522.22.11.9

Weather Map
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wmap_A
GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for Charleston, SC (7,2,3,4)
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Ground Weather Radar Station Wilmington, NC
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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.