Saturday, July11, 2020
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Marine Weather and Tides
Tybee 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 12:45 AM EDT (04:45 UTC) Moonrise 11:54PMMoonset 11:25AM Illumination 68% Phase: Waning Gibbous; Moon at 20 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- 956 Pm Edt Fri Jul 10 2020
Tonight..SW winds 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Sat..SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 to 3 ft. A slight chance of showers and tstms.
Sat night..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.
Sun..SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 to 3 ft, building to 3 to 4 ft in the afternoon. A slight chance of showers and tstms.
Sun night..S winds 10 to 15 kt with gusts to 20 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 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Tue..SW winds 10 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Tue night..S winds 5 to 10 kt. 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..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 956 Pm Edt Fri Jul 10 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 towards the middle of next week.


7 Day Forecast for Marine Location Near Tybee Island city, GA
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location: 32.03, -80.85     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 110204 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1004 PM EDT Fri Jul 10 2020

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

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/. The sea breeze will approach the US-301 corridor through 1 am, while a short wave and a weak cold front that will draw closer from the west.

The interaction of these features, PWat near 2 inches and adequate instability will generate isolated showers and t-storms through until around 3 am. Given DCAPE near 1000 J/kg there certainly could be some gusty winds in a few t-storms. Given rainfall rates that are generally no more than 1 to 1.5 inches/hour, no significant flooding will occur.

It'll be another warm and muggy night, with lows generally no lower than the middle 70s, with even some upper 70s along the coast.

SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/. Saturday and Sunday: The mid-levels will consist of trough over the East Coast. Meanwhile, a series of shortwaves are forecasted to move across the Southeast. At the surface a weak stationary front should linger over or near our area. Moisture is expected to decrease with time, with PWATs dropping from >1.5" Saturday morning to ~1.3" by Sunday afternoon, which is very dry for our area this time of year. This will limit our afternoon convection each afternoon. We're maintaining the chance POPs closer to the coast Saturday afternoon, due to the highest moisture being there and limited lift from a somewhat pinned seabreeze. Sunday the convection will be much more limited due to the drier air. We only have slight chance POPs at that time and it's arguable that they could be even lower. The limited convection will lead to above average temperatures, with highs easily in the mid 90s away from the coast. Sunday should be the hotter of the two days. It's not out of the question a few locations could make a run for the century mark Sunday afternoon. Also, heat indices are a bit of a concern on Saturday. Most locations east of I-95 should peak above 105 degrees. A few spots in the Charleston Tri- County could briefly hit 110 degrees. But at this time the areal coverage and time don't seem large enough to prompt any heat advisories. Heat indices will be a few degrees lower on Sunday with due to lower dew points. Overnight lows will remain mild.

Monday: Mid-level troughing will remain along the East Coast, becoming slightly more amplified. Surface troughing or a weak stationary front should remain in place across or near our area. Southwest flow will usher a return of deeper moisture into our area. The moisture will combine with the afternoon sea breeze to generate much more convection than over the weekend. We have high end POPs, but it's reasonable these may need to be raised further with future forecasts. Temperatures will continue to be above normal, but slightly cooler than over the weekend due to the increased convection.

LONG TERM /MONDAY 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 /02Z SATURDAY THROUGH WEDNESDAY/. VFR with prevail with the 00Z TAF set at both KCHS and KSAV.

Scattered SHRA/TSRA could potentially impact KSAV through until about 07Z and a period of flight restrictions could occur. Until we are more certain we have VCTS and will amend as needed.

Not certain yet whether or not upstream convection will move in or dissipate before impacting KCHS from about 03Z-07Z. So we only have VCSH and will amend if necessary.

The potential for SHRA/TSRA Saturday afternoon is too low to include any mention this far out. But given the interaction of the sea breeze and a wavering stationary front, isolated to scattered coverage will likely occur between 17Z and 23Z Saturday.

Extended Aviation Outlook: There is a greater probability of flight restrictions Monday through Wednesday due to showers/thunderstorms.

MARINE. A weak stationary front will remain over or near our area through early week. The strongest sustained winds are forecast to be 15-18 kt Sunday night with gusts under 25 kt. Likewise, seas should peak in the 3-5 ft range, with a few 6 footers possible for the easternmost portion of the GA offshore waters. But it appears we will remain below Small Craft Advisory criteria. High pressure returns towards the middle of next week.

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

NEAR TERM . SHORT TERM . MS LONG TERM . DPB AVIATION . MARINE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 3 mi51 min SSW 8 G 9.9 84°F 83°F1012.5 hPa
41033 29 mi37 min SW 12 G 18 84°F 84°F1011.2 hPa
ACXS1 - ACE Basin Reserve, SC 42 mi60 min Calm 80°F 1012 hPa78°F
SAXG1 - Sapelo Island Reserve, GA 48 mi45 min S 7 83°F 1012 hPa (+0.0)79°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilton Head Island, Hilton Head Airport, SC15 mi50 minSSW 79.00 miFair84°F78°F84%1012.2 hPa
Hunter U. S. Army Airfield, GA16 mi49 minSW 710.00 miA Few Clouds82°F75°F82%1011.8 hPa
Savannah-Hilton Head International Airport, GA20 mi52 minSSW 1010.00 miPartly Cloudy82°F75°F82%1012.2 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)
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Last 24hrCalmCalmW4CalmCalmN4N4N4N8N8
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1 day agoCalmCalmNW3CalmCalm--CalmCalmCalmN8N8NE11N11NE9NE12NE6S9
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2 days agoSW6W4SW5W43CalmSW5SW5SW5SW5W6NW5NW8NW7NW6N4
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Tide / Current Tables for Tybee Light, Savannah River, Georgia
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Tybee Light
Click for Map
Sat -- 12:25 AM EDT     Moonrise
Sat -- 01:02 AM EDT     6.47 feet High Tide
Sat -- 06:25 AM EDT     Sunrise
Sat -- 07:10 AM EDT     0.61 feet Low Tide
Sat -- 12:25 PM EDT     Moonset
Sat -- 01:28 PM EDT     6.17 feet High Tide
Sat -- 07:23 PM EDT     1.31 feet Low Tide
Sat -- 08:31 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.16.56.25.23.82.41.20.60.91.83.14.45.56.16.15.44.3321.41.42.13.14.2

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 (0,6,7,8)
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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 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.