Thursday, July29, 2021
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Marine Weather and Tides
Whitemarsh Island, GA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:36AMSunset 8:25PM Thursday July 29, 2021 12:10 PM EDT (16:10 UTC) Moonrise 11:07PMMoonset 11:04AM Illumination 72% 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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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 929 Am Edt Thu Jul 29 2021
Rest of today..NE winds 5 kt, becoming E late. Seas 2 ft.
Tonight..S winds 5 to 10 kt, becoming sw 10 kt after midnight. Seas 1 to 2 ft.
Fri..SW winds 10 to 15 kt. Seas 2 to 3 ft.
Fri night..SW winds 15 kt with gusts to 20 kt. Seas 2 to 3 ft.
Sat..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms in the afternoon.
Sat night..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Sun..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sun night..SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Mon..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Mon night..SW winds 10 to 15 kt. Seas 2 to 3 ft. Showers and tstms likely. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 929 Am Edt Thu Jul 29 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build over the area through Saturday. A cold front will stall over or just north of the area Sunday through the middle of next week.


7 Day Forecast for Marine Location Near Whitemarsh Island, GA
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location: 32.08, -81.03     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 291331 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 931 AM EDT Thu Jul 29 2021

SYNOPSIS. High pressure will build over the area through Saturday. A cold front will stall over or just north of the area Sunday through the middle of next week.

NEAR TERM /THROUGH TONIGHT/. No significant changes for the late morning update other than to adjust temp/dewpoint trends for the next several hours. Morning clouds will continue to dissipate during the next hour.

Previous Discussion .

Today: Mid-level heights will steadily rise today as the large anticyclone centered over the Central Plains builds into the Southeast U.S and Deep South. An expansive area of dry air noted on GOES-E water vapor imagery will remain across the area through the afternoon. This dry air will essentially limit the convective potential as any moist updrafts that area able form ahead of the afternoon sea breeze will quickly get choked off due to dry air entrainment. There is a weak signal in a few of the CAMs that enough low-level moisture and H8 theta-e could be present to allow for a shower or two to spark across far interior Southeast Georgia in the Millen-Metter-Reidsville- Ludowici corridor during peak heating, but any such shower activity will be likely very short lived due to the reason noted above. The risk for any measurable rainfall in this area is likely to low to justify a mentionable pop.

Highs will range from the lower-mid 90s inland to the mid 80s at the beaches. Dewpoints are expected to mix out into the lower 70s across the interior, but should hold in the mid-upper 70s across the coastal counties as the sea breeze moves inland. Would not be surprised to see a few spots in the coastal corridor from Beaufort to Charleston see dewpoints briefly hit the 80 degree mark. Heat index values are expected to peak 103-107 (highest across the coastal counties inland from the beaches) which is below the local July Heat Advisory criteria of 110.

Tonight: Clear skies and dry conditions will prevail. While winds across the interior are likely to decouple, winds may stay up a bit across the coastal counties through the night as the pressure gradient is expected to tighten a bit as lee-side troughing develops to the west. Lows will range from the mid 70s inland to the lower 80s at the beaches and Downtown Charleston.

SHORT TERM /FRIDAY THROUGH SUNDAY/. The mid-levels will consist of a long-wave trough to our north and a strong and broad ridge to our west on Friday. The trough will strengthen/amplify with time, pushing the ridge further to the west.

Friday: High pressure will prevail across our area during the day with fair weather clouds. A cold front will approach from the north/northwest at night, but it's not expected to reach our area. Models are in great agreement, keeping the area dry during the day. Some of them hint at weakening convection maybe making it into the Charleston Tri-County during the evening/overnight, then dissipating. But given the dry air, we leaned towards a dry forecast at night. Thickness values and 850 mb temperatures will yield temperatures well above normal. High temperatures are forecasted to be the hottest of the summer. Most locations will be in the upper 90s with several spots inland expected to hit the 100 degree mark. Even the beaches won't be much lower, generally being in the lower 90s. Dew points will vary across our area. Far inland, they'll be in the lower 70s as some drier air mixes in from the northwest. Closer to the coast, they'll rise to at least the mid 70s in the afternoon. They'll be even higher along the immediate coast with upper 70s to near 80 degrees where a pinned sea breeze will allow them to pool. The combination of the heat and humidity will result in the highest heat indices so far this summer. Heat indices above 110 degrees are expected for our coastal counties and the CHS and SAV metro areas. Heat Advisories would be needed for these locations. Farther inland, if more dry air mixes in both the dew points and heat indices would be a few degrees lower, which would be just short of Advisory criteria. Even the night will be steamy, with some locations not falling too far below the 80 degree mark. Temperature records for the hottest nights could be in jeopardy.

Saturday: The cold front will stall over or just north of our area. But moisture will increase with time. Most of the models have dry conditions persisting across our area during the morning and the early afternoon. Then, they have convection developing along the front and the sea breeze late in the day and into the evening. It appears the best convective potential will be across our SC counties, aided by the proximity of the front and the sea breeze. A few pulse severe thunderstorms are possible with damaging wind gusts. But these details will need to be refined in future forecast. Highs again will be well above normal, in the mid to upper 90s. Lows will also be a few degrees above normal.

Sunday: There is the potential for another day with above normal temperatures. But this will all depend on the afternoon convection or lack of. Models differ on the convective potential and its placement. For now, we stayed consistent with our neighboring offices and all went with the NBM.

LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/. The models have been persistent showing a mid-level trough amplifying/strengthening across the eastern half of the country next week. The surface pattern forecast from the WPC has a front just to our north. As a result, the NBM has a wet pattern for our area next week. The wettest conditions should be during the daytime hours. High temperatures are forecasted to be below normal.

AVIATION /14Z THURSDAY THROUGH MONDAY/. VFR.

Extended Aviation Outlook: Flight restrictions are possible in showers and thunderstorms late Saturday through Monday.

MARINE. Today: Northeast winds this morning will veer to the southeast this afternoon as a sea breeze develops and moves inland. Winds will generally remain 10 kt or less with seas 1-2 ft.

Tonight: South to southwest winds will pick up to 10-15 kt overnight in response to lee-side troughing that develops well to the west. Seas will average 1-2 ft.

Friday through Monday: Winds are expected to increase Friday and Friday night as a cold front approaches from the north/northwest. Wind gusts could hit 25 kt in the Charleston Harbor Friday afternoon and evening, so a Small Craft Advisory may be needed for them. Wind gusts across the rest of our coastal waters appear to be just short of 25 kt through Friday night. But if they rise a few kt, then Small Craft Advisories will also be needed in these zones. The front should remain over or just to our north this weekend into early next week. During that time frame, each afternoon expect slight backing of the winds and higher gusts associated with the sea breeze along the land/sea interface and in the Charleston Harbor. Each night, expect slight veering of the winds.

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



NEAR TERM . JRL SHORT TERM . LONG TERM . AVIATION . MARINE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi53 min 83°F 83°F1017.9 hPa
41033 36 mi63 min E 3.9 G 5.8 82°F 83°F1016.8 hPa
ACXS1 - ACE Basin Reserve, SC 45 mi86 min E 1 87°F 1018 hPa78°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 48 mi81 min ENE 5.8 G 7.8 83°F 85°F2 ft1016.6 hPa (+1.6)80°F
SAXG1 - Sapelo Island Reserve, GA 48 mi71 min E 5.1 87°F 1017 hPa (+1.0)87°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, GA7 mi15 minN 010.00 miPartly Cloudy88°F75°F65%1016.9 hPa
Savannah-Hilton Head International Airport, GA10 mi18 minN 010.00 miPartly Cloudy86°F76°F72%1017.5 hPa
Hilton Head Island, Hilton Head Airport, SC20 mi81 minN 010.00 miPartly Cloudy86°F77°F75%1017.9 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrCalmCalmN4CalmCalmNW8CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoNW3NW5NW3N4NE5E4E5SE5CalmCalmS9SW5SW7NW4W3W3SW6W5W3W5CalmCalmNW7N4
2 days agoN4NE7E10E11E11E12SE5E5E5E5E5E5S7SE3S9
G16
S4CalmCalmSW4--NW7CalmN3N3

Tide / Current Tables for Fort Jackson, Savannah River, Georgia
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Fort Jackson
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Thu -- 01:16 AM EDT     7.55 feet High Tide
Thu -- 06:37 AM EDT     Sunrise
Thu -- 07:33 AM EDT     0.16 feet Low Tide
Thu -- 12:04 PM EDT     Moonset
Thu -- 01:37 PM EDT     7.34 feet High Tide
Thu -- 07:52 PM EDT     1.04 feet Low Tide
Thu -- 08:23 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.17.57.46.54.93.11.50.40.31.43.256.57.27.36.75.43.92.41.41.11.734.6

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Thu -- 01:48 AM EDT     -0.00 knots Slack
Thu -- 05:08 AM EDT     -2.03 knots Max Ebb
Thu -- 06:36 AM EDT     Sunrise
Thu -- 07:48 AM EDT     0.01 knots Slack
Thu -- 10:23 AM EDT     2.11 knots Max Flood
Thu -- 12:03 PM EDT     Moonset
Thu -- 02:08 PM EDT     -0.00 knots Slack
Thu -- 05:27 PM EDT     -1.87 knots Max Ebb
Thu -- 08:20 PM EDT     0.00 knots Slack
Thu -- 08:22 PM EDT     Sunset
Thu -- 10:52 PM EDT     1.66 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.8-0.2-1.2-1.8-2-1.8-10.31.52.121.610.2-0.9-1.6-1.8-1.8-1.4-0.40.71.51.7

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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