Saturday, December14, 2019
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Marine Weather and Tides
Port Royal, 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 7:14AMSunset 5:20PM Saturday December 14, 2019 6:34 PM EST (23:34 UTC) Moonrise 7:52PMMoonset 9:28AM Illumination 89% Phase: Waning Gibbous; Moon at 18 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- 348 Pm Est Sat Dec 14 2019
.small craft advisory in effect until 9 pm est this evening...
Tonight..W winds 15 to 20 kt gusting to 25 kt, diminishing to 10 to 15 kt with gusts to 20 kt late evening. Seas 3 to 4 ft.
Sun..W winds 5 to 10 kt, becoming sw in the afternoon. Seas 2 to 3 ft.
Sun night..S winds 5 kt. Seas 2 ft.
Mon..S winds 5 to 10 kt. Seas 2 to 3 ft.
Mon night..S winds 10 to 15 kt. Seas 3 to 4 ft, building to 4 to 5 ft after midnight. A slight chance of showers after midnight.
Tue..SW winds 10 to 15 kt with gusts to 20 kt. Seas 4 to 5 ft. A chance of showers in the morning, then showers likely with a slight chance of tstms in the afternoon.
Tue night..NW winds 10 to 15 kt, becoming N 15 to 20 kt after midnight. Seas 3 to 4 ft. Showers likely.
Wed..N winds 15 to 20 kt. Seas 3 to 4 ft.
Wed night..N winds 15 kt. Seas 2 to 3 ft.
Thu..NE winds 10 to 15 kt. Seas 3 to 4 ft.
Thu night..NE winds 10 kt. Seas 3 to 4 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 348 Pm Est Sat Dec 14 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build from the west through the weekend and then slide offshore on Monday. A cold front will then cross the area late Tuesday, followed by high pressure into late next week. Low pressure should then develop along the coast next weekend.


7 Day Forecast for Marine Location Near Port Royal town, SC
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location: 32.33, -80.47     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 142052 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 352 PM EST Sat Dec 14 2019

SYNOPSIS. High pressure will build from the west through the weekend and then slide offshore on Monday. A cold front will then cross the area late Tuesday, followed by high pressure into late next week. Low pressure should then develop along the coast next weekend.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. Dry high pressure will settle over the area tonight with weakening winds this evening. Fairly good radiational cooling will produce a cool night with lows in the upper 30s to lower 40s. Some fog could move into our far southern GA zones late tonight after developing over central GA.

SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/. Sunday: Sfc high pressure will begin the day on Sunday centered over the FL/GA line. The high center is expected to drift east during the day, positioned off Southeast U.S. coast by Sunday afternoon. As a result, weak return flow will develop across the forecast area by Sunday afternoon. The combination of warming thicknesses and mostly sunny conditions should result in steady heating through the day. High temperatures are forecast to range from the upper 60s across SE GA to the mid 60s across the I-26 corridor.

Sunday night through Monday night: The forecast area will remain between high pressure over the Atlantic and developing low pressure over the ArkLaTex. Strengthening return flow, especially on Monday, is forecast to result in steadily warming thicknesses Sunday night through Monday. Mostly clear conditions and light to calm winds should support radiational cooling Sunday night, lows forecast to range in the 40s. Mild thicknesses and llvl temperatures should result in around 25 degrees of warming during the daylight hours on Monday. High temperatures are forecast to range from the low 70s across Berkeley County to the upper 70s across SE GA. Monday night, winds should remain steady from southwest, maintaining mixing. Short term guidance times the arrival of weak showers during the late night hours Monday night. Using a blend of MOS, low temperatures are forecast to range in the upper 50s to around 60.

Tuesday: A cold front will approach the forecast area from the west, remaining west during the morning hours. The cold front is expected to reach SE GA and SC by the afternoon, pushing offshore during the evening hours. The GFS indicates that between 500-1000 J/kg of CAPE will develop along and ahead of the cold front. I will indicate a band of showers with embedded thunderstorms crossing the forecast area Tuesday afternoon into the early evening. High temperatures are expected to range slightly cooler than Monday.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/. Dry and cooler high pressure will spread across the region Tuesday night through Thursday with high/low temps some 15-20 degrees cooler than earlier in the week. In general, high temps will peak in the mid 50s Wednesday and Thursday while overnight lows dip into the low/mid 30s away from the coast Wednesday night and Thursday night. Guidance then suggests the potential for precip to return across the area next weekend, mainly due to a coastal trough/low developing just off the Southeast Coast. Precip chances should be highest near the land/sea interface Saturday. Temps will be slightly more mild during the weekend as well, peaking in the upper 50s/lower 60s each day. Overnight lows should range in the upper 30s/lower 40s away from the coast.

AVIATION /21Z SATURDAY THROUGH THURSDAY/. VFR conditions will prevail at both terminals. During the afternoon hours expect to see only scattered clouds at best. Gusty west winds will persist until shortly before dusk, with possible gusts up to 25 kt. After dusk, winds will be light and westerly through 18Z Sunday.

Extended Aviation Outlook: Brief patchy fog is possible around dawn Sunday and Monday mornings at both CHS and SAV terminals. Otherwise, conditions will remain VFR. Flight restrictions are possible at both terminals Tuesday due to showers/thunderstorms along a passing cold front. VFR conditions are forecast at both terminals Wednesday.

MARINE. The gradient will gradually relax this evening and overnight. Small Craft Advisories drop off sequentially through the evening and overnight.

Sunday through Thursday: Sfc high pressure will begin the day on Sunday centered over the FL/GA line. The high center is expected to drift east during the day, positioned off Southeast U.S. coast by Sunday afternoon and will linger through Monday night. Light south winds are forecast Sunday through Monday, with winds increasing from the southwest Monday night. Seas will range from 1-3 ft on Sunday, building to 3-5 ft by Monday night. A cold front will approach the forecast area from the west, remaining west during the morning hours. The cold front is expected to reach SE GA and SC by the afternoon, pushing offshore during the evening hours. Small Craft Advisory seas and wind gusts could develop during the day across AMZ350 and 374. Small Craft conditions may spread into the other near shore waters Tuesday night into Wednesday morning. Building high pressure will continue in the wake of the cold front, maintain steady to gusty NW winds Wednesday, turning from the NE on Thursday. Seas around 6 ft may continue across the outer GA waters from Tuesday through Thursday.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 6 PM EST this evening for AMZ330. Small Craft Advisory until 9 PM EST this evening for AMZ352. Small Craft Advisory until midnight EST tonight for AMZ350. Small Craft Advisory until 5 AM EST Sunday for AMZ374.

NEAR TERM . JRL SHORT TERM . JRL LONG TERM . DPB AVIATION . NED/RAD MARINE . JRL/NED


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41033 5 mi87 min W 16 G 21 56°F 56°F1009.7 hPa
ACXS1 - ACE Basin Reserve, SC 16 mi110 min W 4.1 56°F 1009 hPa47°F
FPKG1 - 8670870 - Fort Pulaski, GA 31 mi65 min W 8 G 9.9 56°F 56°F1010.3 hPa
FBIS1 - Folly Island, SC 39 mi35 min W 6 G 8.9 53°F 1009.6 hPa (+3.4)46°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Beaufort County Airport, SC10 mi40 minW 67.00 miFair54°F44°F72%1009.8 hPa
Hilton Head Island, Hilton Head Airport, SC14 mi45 minW 510.00 miFair54°F46°F77%1010.2 hPa
Beaufort, Marine Corps Air Station, SC17 mi39 minW 73.00 miFair53°F45°F74%1009.8 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)
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Last 24hrCalmNW4Calm4CalmCalmCalmSW4CalmNW9
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Tide / Current Tables for Fripps Inlet, Hunting Island Bridge, St. Helena Sound, South Carolina
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Station Creek, County Landing, South Carolina
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Station Creek
Click for Map
Sat -- 02:57 AM EST     -0.42 feet Low Tide
Sat -- 07:15 AM EST     Sunrise
Sat -- 09:28 AM EST     Moonset
Sat -- 09:37 AM EST     8.19 feet High Tide
Sat -- 03:34 PM EST     -0.07 feet Low Tide
Sat -- 05:18 PM EST     Sunset
Sat -- 07:52 PM EST     Moonrise
Sat -- 10:03 PM EST     6.71 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.81.90.2-0.40.21.73.75.77.288.17.25.63.61.60.200.92.44.15.56.46.76.3

Weather Map
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wmap_A
GEOS Local Image of Southeast    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (18,4,5,8)
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Ground Weather Radar Station Charleston, SC
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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.