Saturday, February29, 2020
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Marine Weather and Tides
Port Wentworth, GA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 6:50AMSunset 6:22PM Saturday February 29, 2020 7:02 AM EST (12:02 UTC) Moonrise 10:14AMMoonset 11:50PM Illumination 34% Phase: Waxing Crescent; Moon at 6 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- 552 Am Est Sat Feb 29 2020
.small craft advisory in effect through this evening...
Today..W winds 15 to 20 kt with gusts to 25 kt. Seas 2 to 3 ft, except 1 to 2 ft near the immediate coast.
Tonight..NW winds 15 to 20 kt with gusts to 25 kt, diminishing to 10 to 15 kt after midnight. Seas 2 to 3 ft, subsiding to 1 to 2 ft.
Sun..N winds 5 to 10 kt, becoming se in the afternoon. Seas 1 foot.
Sun night..S winds 5 to 10 kt. Seas 2 ft.
Mon..SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 ft.
Mon night..S winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft, building to 3 to 4 ft after midnight.
Tue..SW winds 15 to 20 kt. Seas 4 to 5 ft.
Tue night..S winds 20 kt. Seas 4 to 6 ft.
Wed..S winds 20 to 25 kt. Seas 6 to 8 ft. A chance of showers with a slight chance of tstms.
Wed night..SW winds 20 to 25 kt. Seas 5 to 7 ft. A chance of showers with a slight chance of tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 552 Am Est Sat Feb 29 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will extend across the region through Tuesday. A cold front could bring impacts to the region during the middle of next week.


7 Day Forecast for Marine Location Near Port Wentworth, GA
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location: 32.17, -81.13     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 291044 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 544 AM EST Sat Feb 29 2020

. THE LOCAL GROWING SEASON BEGINS SUNDAY .

SYNOPSIS. High pressure will extend across the region through Tuesday. A cold front could bring impacts to the region during the middle of next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Minor adjustments were made to hourly sky cover for the afternoon hours and to nudge highs up a degree or two in the Savannah to North Charleston corridor.

The cold front that pushed offshore earlier is now located well out into the Atlantic. High pressure centered over the western Gulf of Mexico will gradually merge with a secondary high that will move into the Tennessee Valley later today, creating a large, subtropical anticyclone that will propagate rapidly to the east. A mid-level cold pocket associated with one last shortwave rounding the base of the exiting longwave trough could produce steep enough lapse rates to promote the generation of a shallow stratocumulus field across portions of the eastern Midlands, Pee Dee and the I-26 corridor during the afternoon as high temperatures warm into the upper 50s to lower 60s. Most areas will see sunny skies, but a period of mostly sunny to partly cloudy skies will be possible across the north, including the Charleston Metro Area. Deep, vertical mixing profiles will support a breezy day with winds 15-20 mph and gusts 25-30 mph.

Lake Winds: Winds are expected to increase on Lake Moultrie through the day, reaching 15-20 kt. The mixing profiles suggest marginal gusts as high as 25 kt could occur, mainly along the lakeshore. Given the marginal nature of both the sustained and gust potential, the need for a Lake Wind Advisory will be determined later this morning once the 12z CHS RAOB is analyzed and additional high resolution model data are received.

SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY/. Tonight: High pressure will settle directly over the region as mid-level heights slowly rise through the night. The boundary layer is expected to decouple later in the evening with winds going calm to light for most areas. Clear skies, calm winds and dewpoints in the lower-mid 20s will support strong radiational cooling away from bodies of water with lows poised to drop into the upper 20s/lower 30s inland, lower-mid 30s at the coast with upper 30s/near 40 at the beaches, Downtown Charleston, and areas immediate adjacent to the Santee-Cooper lakes. The freezing line looks to setup roughly along US-17 in south coastal South Carolina and I-95 in coastal Georgia, including parts of the Savannah and Charleston Metro Areas. The local growing season begins on 1 March, so a Freeze Watch has been posted for all but the Georgia coastal zones. Freeze durations will range from 3-6 hours far inland to 1-2 hours near the above mentioned freezing line. Although dewpoints depressions will remain somewhat elevated, soil moisture levels remain quite high and will support the formation of scattered to widespread frost for many areas away from the coast.

Sunday: A weak, mid-level ridge will move over the East coast later in the day, then move offshore overnight. Surface high pressure centered overhead in the morning will shift offshore during the afternoon and gradually move away overnight. Plenty of subsidence is in place, leading to a dry and mostly sunny forecast. The combination of mostly sunny skies, warmer 850 mb temperatures, and S to SW surface winds will moderate the airmass. High temperatures will generally be in the 60s.

Monday: The mid-levels will consist of zonal flow. At the surface, high pressure offshore is forecasted to move away. During the afternoon, a weak surface trough is expected to form just to our east, causing some showers, Though, most of the models keep these showers over the coastal waters during the afternoon and into the night. Meanwhile, a cold front will be to our distant west, slowly approaching. The models indicate some showers ahead of this front could make it into our western areas during the afternoon and into the night. But they should be light with very little, if any QPF. Hence, we're only going slight chance POPs. Essentially, most locations should be dry a majority of the time. Warmer temperatures are expected within the S to SW surface winds. Highs should be around 70 degrees. Lows should be in the 50s.

Tuesday: Mid-level zonal flow should prevail with heights gradually rising. A weak surface trough will remain to our east while a cold front approaches from the west. While the models keep any showers associated with the trough far offshore, they disagree on the precipitation potential from the approaching front. Some indicate it'll be mostly dry while others have decent QPF for us. Since a majority generally have us within the dry slot, and this has been the trend for the past few days, we opted to go this route. Slight chance POPs are limited to far inland. The noticeable change will be the high temperatures. Despite increasing clouds, 850 mb temperatures and thickness values support temperatures into the upper 70s to near 80 degrees. Though, it'll be much cooler at the beaches due to the slightly onshore winds. It'll also be breezy for most locations, especially in the afternoon.

LONG TERM /TUESDAY NIGHT THROUGH FRIDAY/. The 00Z models still differ quite a bit during the long term. They range from having the front quickly moving through Wednesday night, to hanging around into Thursday or even Thursday night. We trended in the slower direction, but expect more changes will be needed with future forecasts. There remains the concern for severe weather with the front. But this will depend largely on if multiple variables are able to come together.

AVIATION /12Z SATURDAY THROUGH WEDNESDAY/. VFR. Gusty winds will impact the terminals after daybreak. Gusts 22-26 kt are likely at both KCHS and KSAV.

Extended Aviation Outlook: Flight restrictions are possible ahead of a cold front Tuesday night into Wednesday. Also, it'll be breezy Tuesday and Wednesday.

MARINE. Today: Elevated winds will persist across the waters today as cold air advection lingers as shortwave energy passes by. West to northwest winds of 15-20 kt with gusts to 25 kt are expected nearshore waters with 20-25 kt with gusts to 30 kt over the Georgia offshore leg. Small Craft Advisories remain in force for these areas. Offshore winds will limited sea growth with max seas ranging from 2-4 ft nearshore (1-2 ft near the immediate coast) with 3-5 ft over the Georgia offshore waters. For Charleston Harbor, winds will pick up later this morning with winds reaching 15-20 kt. The gust potential will be heavily augmented by the more unstable land areas adjacent to the harbor. Frequent gusts to 25-27 kt seem reasonable as winds peak this afternoon, so a Small Craft Advisory has been issued from roughly noon until 6 PM. Waves will average 1-2 ft.

Tonight: Winds and seas will rapidly diminish as high pressure builds in from the west. Conditions look to drop below Small Craft Advisory thresholds by late evening. Overnight, north to northwest winds will average 10-15 kt with seas 1-2 ft nearshore and 2-3 ft offshore.

Sunday: High pressure will be located just off the Southeast coast, causing winds to become S to SW 10 kt or less and seas 2 ft or less.

Monday: The high will move further offshore while a weak surface trough forms just east of our coastal waters. Additionally, a cold front will slowly approach from the distant west. The interaction between all of these features will lead to increasing winds and building seas, especially late in the afternoon and overnight.

Tuesday: The weak surface trough should persist to the east of our coastal waters while the cold front to our west gets closer and strengthens. An intensifying gradient will cause winds and seas to rapidly increase, especially late. Small Craft Advisories are likely for all of the waters.

Wednesday: A strong cold front will approach from the west, possibly moving through late. Ahead of the front, winds will be strong, accompanied by hazardous seas. Small Craft Advisories should be ongoing everywhere, including the Charleston Harbor. It's not out of the question some locations could briefly have gale force gusts.

CHS WATCHES/WARNINGS/ADVISORIES. GA . Freeze Watch from late tonight through Sunday morning for GAZ087-088-099>101-114>116-118-137-138-140. SC . Freeze Watch from late tonight through Sunday morning for SCZ040-042>045-047>052. MARINE . Small Craft Advisory until 10 PM EST this evening for AMZ350- 352-354-374. Small Craft Advisory from noon today to 6 PM EST this evening for AMZ330.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 15 mi44 min WSW 4.1 G 6 44°F 53°F1021.9 hPa
41033 39 mi54 min W 14 G 18 48°F 55°F1021.7 hPa
ACXS1 - ACE Basin Reserve, SC 45 mi77 min Calm 39°F 1021 hPa34°F
SAXG1 - Sapelo Island Reserve, GA 53 mi62 min W 5.1 45°F 1022 hPa (+1.0)40°F

Wind History for Fort Pulaski, GA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Savannah-Hilton Head International Airport, GA4 mi69 minWSW 510.00 miFair41°F37°F86%1021.4 hPa
Hunter U. S. Army Airfield, GA10 mi66 minWSW 510.00 miFair38°F33°F85%1021 hPa
Hilton Head Island, Hilton Head Airport, SC23 mi87 minVar 410.00 miFair41°F37°F87%1021.3 hPa

Link to 5 minute data for KSAV

Wind History from SAV (wind in knots)
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Tide / Current Tables for Little Back River, Hwy. 17, Back River., Savannah River, South Carolina
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Little Back River
Click for Map
Sat -- 12:22 AM EST     7.32 feet High Tide
Sat -- 06:52 AM EST     Sunrise
Sat -- 06:56 AM EST     0.69 feet Low Tide
Sat -- 10:14 AM EST     Moonrise
Sat -- 12:48 PM EST     6.82 feet High Tide
Sat -- 06:21 PM EST     Sunset
Sat -- 07:15 PM EST     0.39 feet Low Tide
Sat -- 11:49 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.37.26.55.33.72.110.71.22.64.35.76.66.86.45.54.22.51.10.40.71.93.75.6

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 12:31 AM EST     -0.00 knots Slack
Sat -- 03:14 AM EST     -1.65 knots Max Ebb
Sat -- 06:51 AM EST     0.00 knots Slack
Sat -- 06:51 AM EST     Sunrise
Sat -- 09:21 AM EST     1.48 knots Max Flood
Sat -- 10:13 AM EST     Moonrise
Sat -- 12:56 PM EST     -0.00 knots Slack
Sat -- 03:39 PM EST     -1.49 knots Max Ebb
Sat -- 06:20 PM EST     Sunset
Sat -- 07:00 PM EST     0.00 knots Slack
Sat -- 09:44 PM EST     1.80 knots Max Flood
Sat -- 11:48 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.4-0.4-1.2-1.6-1.5-1.2-0.70.111.41.40.90.5-0-0.8-1.4-1.5-1.2-0.7-00.91.61.81.4

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (7,2,3,4)
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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 numerous 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.