Saturday, July11, 2020
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Marine Weather and Tides
Wilmington Island, 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 6:25AMSunset 8:33PM Saturday July 11, 2020 12:52 PM EDT (16:52 UTC) Moonrise 11:54PMMoonset 11:26AM Illumination 63% Phase: Waning Gibbous; Moon at 21 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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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 1024 Am Edt Sat Jul 11 2020
Rest of today..SW winds 5 to 10 kt, becoming S late. Seas 2 ft. A slight chance of showers and tstms this afternoon.
Tonight..S winds 10 to 15 kt, becoming sw 5 to 10 kt after midnight. Seas 2 to 3 ft. A slight chance of showers and tstms in the evening.
Sun..SW winds 5 to 10 kt, becoming S in the afternoon. Seas 2 to 3 ft. A slight chance of showers and tstms in the afternoon.
Sun night..S winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms in the evening.
Mon..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Mon night..SW winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Tue..SW winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Tue night..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Wed..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Wed night..SE winds 5 to 10 kt. Seas 2 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1024 Am Edt Sat Jul 11 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak stationary front will linger over or near our area through early next week. High pressure is expected to return during the middle of next week and persist through late next week.


7 Day Forecast for Marine Location Near Wilmington Island, GA
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location: 32, -81     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 111441 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1041 AM EDT Sat Jul 11 2020

SYNOPSIS. A weak stationary front will linger over or near our area through early next week. High pressure is expected to return during the middle of next week and persist through late next week.

NEAR TERM /THROUGH TONIGHT/. Late morning update: initialized temps/dew points with current obs and forecast is on track. Decreased sky cover to match with satellite imagery. Maintained slight chance/chance POPs along the coast late this afternoon.

Models continue to show an upper short wave trough axis moving east of the area. Latest water vapor imagery confirms that deeper layer drying has moved into the region behind the upper trough axis. Still feel that the lower values of deep layer moisture will result in relatively low coverage of convection this afternoon. Have continued slight chance to low end chance PoPs mainly for coastal regions, within the sea breeze trough this afternoon and early evening. Most locations will likely not see any showers/thunderstorms today. High temperatures will be hot, in the lower to mid 90s. These hot temperatures combined with surface dewpoint temperatures in the lower to mid 70s will result in afternoon heat indices of 105-109, especially along and east of I-95.

Tonight: any convection is expected to end after sunset. Otherwise, partly cloud skies and warm, with lows in the mid to upper 70s, except lower 70s well inland.

SHORT TERM /SUNDAY THROUGH TUESDAY/. Sunday: Weak low pressure will be in place across the Southeast in advance of a more substantial mid/upper trough extending across the East Conus. Weak h5 shortwave energy rounding the base of the trough will reach the area late in the afternoon, favoring somewhat dry conditions for much of the day. However, a few showers and/or thunderstorms can not be ruled out during the afternoon/evening hours. West flow aloft in combination with strong sfc heating will favor very warm temps during the afternoon, peaking in the mid/upper 90s away from the coast. Heat index values could approach 100-105 degrees, highest closer to the coast where sfc dewpts are slow to mix out compared to locations well inland.

Monday: The base of a mid/upper lvl trough of low pressure will gradually swing across the Mid-Atlantic and Southeast states early next week, helping a weak cold front approach inland areas. Ahead of the front, moisture characterized by PWATs between 1.5-2.0 inches should advect across the region, helping support few to scattered showers/thunderstorms during peak heating hours. H5 shortwave energy aloft could maintain shower/thunderstorm activity through late evening hours, before the bulk of precip shifts offshore overnight. Temps should remain warm, but greater precip coverage should limit daily maximums a few degrees. In general, afternoon highs should range in the low/mid 90s. Overnight lows should range in the low/mid 70s away from the coast.

Tuesday: The axis of a mid/upper lvl trough of low pressure will likely be offshore while a ridge of high pressure begins to build across the Southeast United States from the west. Although precip coverage is anticipated to be less than the previous day, any lingering moisture near a stationary front/boundary could lead to few/scattered showers and thunderstorms during peak heating hours. Temps will be warm once again, peaking in the low/mid 90s (warmest away from the coast).

LONG TERM /TUESDAY NIGHT THROUGH FRIDAY/. A mid/upper lvl trough centered across the Northeast United States will begin to shift offshore and become replaced by a large mid/upper lvl ridge of high pressure expanding across much of the southern half of the United States. The pattern suggests a more typical summertime pattern through late week with few to scattered showers and thunderstorms possible during afternoon/evening hours each day. High temps will also be a few degrees above normal through the week, generally ranging low/mid 90s each day (warmest inland), but could be a degree or two cooler late week as the sfc flow becomes more directly onshore. Overnight lows should range in the low/mid 70s away from the coast.

AVIATION /14Z SATURDAY THROUGH WEDNESDAY/. Today: Expect VFR conditions to prevail at both KCHS and KSAV. Isolated to scattered afternoon showers and thunderstorms could briefly impact either terminal this afternoon between 18z and 23z. However, due to expected isolated coverage, chances of any site having a direct impact from convection too low to include in the TAFs.

Extended Aviation Outlook: VFR conditions are expected at both CHS and SAV terminals Sunday. Brief flight restrictions are possible at both terminals Monday due to showers/thunderstorms. VFR conditions will generally prevail at both terminals Tuesday and Wednesday.

MARINE. No highlights expected today and tonight. A weak surface front/trough will approach the waters today, which is expected to stall near or slightly inland of the coast. Southwest winds of 15 knots or less and seas 2 to 4 feet will prevail.

Sunday through Thursday: A weak sfc trough of low pressure could linger near the coastal waters late weekend into early next week while a ridge of high pressure develops aloft. High pressure will then generally prevail across the coastal waters during the middle of next week. Given the pattern, winds/seas are expected to remain below Small Craft Advisory levels through the week. However, south- southwest winds could gust upwards to 15-20 kts at times, mainly Sunday night and Monday night. Thereafter, the pressure gradient remains rather week, supporting gusts only upwards to 10-15 kt. Seas will range between 3-5 ft early week, then subside to 2-3 ft during the middle of the week.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . None.

NEAR TERM . SHORT TERM . DPB LONG TERM . DPB AVIATION . RFM MARINE . DPB/RFM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 6 mi58 min NW 2.9 G 2.9 88°F 83°F1011.7 hPa
41033 37 mi44 min SW 5.8 G 9.7 84°F 85°F1010.6 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 42 mi62 min W 7.8 G 7.8 83°F 84°F2 ft1011.3 hPa (+0.0)78°F
SAXG1 - Sapelo Island Reserve, GA 43 mi52 min WNW 1.9 92°F 1011 hPa (-1.0)77°F
ACXS1 - ACE Basin Reserve, SC 48 mi67 min SE 1 90°F 1011 hPa79°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA8 mi56 minW 510.00 miFair92°F76°F60%1010.8 hPa
Savannah-Hilton Head International Airport, GA14 mi59 minNNW 610.00 miA Few Clouds93°F75°F56%1011.2 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi62 minN 010.00 miFair91°F78°F67%1011.5 hPa

Link to 5 minute data for KSVN

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Last 24hrN4W5W4S6E6SE9S7S6S4S6S5SW7SW6CalmSW3SW3SW4W5W5W6W7NW4W4W5
1 day agoNW8NW8N5NE3SE9S6SW5CalmCalm--CalmCalmCalmW3W3NW4CalmW4W3NW5N5NW4NW6NW7
2 days agoW11NW11W8W8W9W8W4W8W5W5NW6W5W6W3W3W3CalmNW3CalmW5NW4NW4NW5NW7

Tide / Current Tables for Savannah Sheraton Resort Hotel, Wilmington River, Georgia
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Savannah Sheraton Resort Hotel
Click for Map
Sat -- 12:25 AM EDT     Moonrise
Sat -- 01:26 AM EDT     7.39 feet High Tide
Sat -- 06:26 AM EDT     Sunrise
Sat -- 07:28 AM EDT     0.71 feet Low Tide
Sat -- 12:26 PM EDT     Moonset
Sat -- 01:52 PM EDT     7.05 feet High Tide
Sat -- 07:41 PM EDT     1.51 feet Low Tide
Sat -- 08:32 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.77.37.36.453.31.70.80.81.734.55.86.876.55.43.92.61.71.52.13.24.4

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 12:25 AM EDT     Moonrise
Sat -- 02:22 AM EDT     -0.00 knots Slack
Sat -- 05:36 AM EDT     -1.69 knots Max Ebb
Sat -- 06:25 AM EDT     Sunrise
Sat -- 08:27 AM EDT     0.00 knots Slack
Sat -- 11:01 AM EDT     1.84 knots Max Flood
Sat -- 12:25 PM EDT     Moonset
Sat -- 02:44 PM EDT     -0.00 knots Slack
Sat -- 05:33 PM EDT     -1.52 knots Max Ebb
Sat -- 08:31 PM EDT     Sunset
Sat -- 08:57 PM EDT     0.00 knots Slack
Sat -- 11:26 PM EDT     1.46 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.30.90.3-0.6-1.3-1.7-1.7-1.4-0.50.61.51.81.61.20.6-0.2-1.1-1.5-1.5-1.3-0.80.10.91.4

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 (12,3,4,5)
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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 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.