Tuesday, April20, 2021
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Marine Weather and Tides
Hilton Head Island, SC

Version 3.4
NOTICE
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 6:46AMSunset 7:57PM Tuesday April 20, 2021 1:13 AM EDT (05:13 UTC) Moonrise 12:03PMMoonset 1:47AM Illumination 58% Phase: First Quarter Moon; Moon at 8 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- 1009 Pm Edt Mon Apr 19 2021
Tonight..NW winds 5 kt, becoming ne after midnight, then becoming E 10 to 15 kt with gusts to 20 kt late. Seas 2 ft.
Tue..E winds 10 to 15 kt. Seas 2 ft. A slight chance of showers in the afternoon.
Tue night..SE winds 5 to 10 kt, becoming sw after midnight. Seas 2 ft. A slight chance of showers in the evening.
Wed..W winds 10 to 15 kt. Seas 2 ft.
Wed night..NW winds 15 to 20 kt, becoming N after midnight. Seas 2 to 3 ft, building to 3 to 4 ft after midnight.
Thu..NE winds 15 to 20 kt, becoming E 5 to 10 kt in the afternoon. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the afternoon.
Thu night..SE winds 5 kt. Seas 2 ft.
Fri..E winds 5 to 10 kt. Seas 2 ft.
Fri night..SE winds 10 kt. Seas 2 to 3 ft. A chance of showers.
Sat..SE winds 15 to 20 kt. Seas 3 to 4 ft. Showers with a slight chance of tstms.
Sat night..SW winds 15 to 20 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 1009 Pm Edt Mon Apr 19 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Weak high pressure will remain over the region early this week. Then, a cold front will sweep across the region on Wednesday. High pressure will then return for late week. Low pressure will impact the area over the weekend.


7 Day Forecast for Marine Location Near Hilton Head Island, SC
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location: 32.22, -80.77     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 200216 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1016 PM EDT Mon Apr 19 2021

SYNOPSIS. Weak high pressure will remain over the region early this week. Then, a cold front will sweep across the region on Wednesday. High pressure will then return for late week. Low pressure will impact the area over the weekend.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. The center of dry high pressure will push over the region tonight, with scattered to maybe broken mid and high level clouds arriving after midnight, especially south and west. This is in association with the upper jet that passes over the local area.

Since the air mass is so dry with PWat down near 1/2, winds will be light or calm away from the coast, and we're already several degrees cooler than 24 hours ago, we look for min temperatures a bit cooler than last night. The cloud cover that moves in will slow the decline of temperatures, but we still look to fall to the lower and middle 50s most places inland from US-17, with upper 50s and lower 60s along the barrier islands, in downtown Charleston and near Lake Moultrie.

SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/. As high pressure moves away from the area and into the Atlantic on Tuesday, low pressure will move off the coast of Florida in an eastward direction across the Atlantic. While there will be increased isentropic lift and PWATs will be around an inch, any shower activity will likely remain just along the coast and across the coastal waters. Most inland areas should remain rain-free. High temperatures will be in the 70s. Thereafter, a surface low will make its way across the Ohio River Valley overnight Tuesday. Low temperatures will be in the mid to upper 50s inland and low 60s just along the coast. Then on Wednesday, a dry cold front associated with the low will then move through the area and as the pressure gradient tightens, winds will become gusty. Though, the day should be mostly sunny with high temperatures in the upper 70s to low 80s. Lows will be in low to upper 40s inland with low 50s just along the coast due to cold air advection. For Thursday, high pressure will generally prevail and it will be a nice, sunny day. High temperatures will be in the mid 60s to low 70s inland and low 60s just along the coast.

Lake Winds: Winds ahead and behind a cold front will become quite gusty due to a tightening pressure gradient. A Lake Wind Advisory could be needed for Lake Moultrie.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/. Overnight Thursday, high pressure will prevail and low temperatures will be in the mid 40s to low 50s inland and mid 50s just along the coast. Then on Friday, another dry day and mostly sunny skies is expected. Though, as a deep-layered trough moves closer to the area from the west, cloud cover will slightly increase. High temperatures will be in the 70s with lows in the mid to upper 50s inland and low to mid 60s just along the coast.

While there is still uncertainty within the models for timing and location of the approaching low pressure, rain chances will increase on Saturday into Sunday morning. The best chance of rain looks to be during Saturday afternoon into the overnight. By daybreak, the low pressure should be comfortably to the northeast and the cold front should be offshore. Though, a secondary cold front could then move through the region. The majority of Sunday and all of Monday should be rain-free as high pressure quickly builds into the area. High temperatures will be in the mid to upper 70s to low 80s each day. Low temperatures will be in the 50s inland and low 60s just along the coast.

AVIATION /02Z TUESDAY THROUGH SATURDAY/. VFR through 00Z Wednesday. SE winds will become a little gusty in wake of the sea breeze Tuesday afternoon.

Extended Aviation Outlook: Mainly VFR. Gusty winds likely on Wednesday, then again on Saturday. Flight restrictions will also be possible on Saturday due to showers/thunderstorms.

MARINE. High pressure will build over the region tonight. As pressures rise from the NE, a bit of wind surge will push from the NE to SW across the coastal waters tonight. N and NW winds will veer around to the ENE, and strengthen to 10 to 15 kts with gusts to 20 kts after midnight over the marine zones outside the CHS Harbor. Seas will increase slightly from 1-2 ft early on, to around 2 ft across most areas by daybreak.

Tranquil marine conditions expected to last through early Wednesday. Then, ahead of an approaching cold front, winds will increase by Wednesday afternoon to 15-20 knots and Small Craft Advisories could be needed for winds and seas through Thursday morning. High pressure will then build into the area and tranquil marine conditions should return through late Friday. Another round of Small Craft Advisories could be needed over the weekend due to another approaching cold front.

FIRE WEATHER. A combination of gusty winds, low relative humidity, and dry fuels could produce hazardous fire conditions Wednesday afternoon/early evening. Near critical relative humidity values will persist Thursday and Friday afternoons, although winds will remain less than 15 mph.

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



NEAR TERM . SHORT TERM . RAD LONG TERM . RAD AVIATION . MARINE . FIRE WEATHER .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 15 mi55 min 66°F1015.5 hPa
41033 20 mi65 min ENE 5.8 G 7.8 69°F 67°F1014.3 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi88 min Calm 61°F 1015 hPa50°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 57 mi83 min E 1.9 G 3.9 69°F 68°F1 ft1014.7 hPa (+1.9)56°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, SC4 mi18 minN 010.00 miFair57°F50°F77%1015.9 hPa
Beaufort County Airport, SC15 mi18 minNE 410.00 miFair61°F50°F68%1015.6 hPa
Beaufort, Marine Corps Air Station, SC18 mi17 minN 0 miFair56°F47°F72%1015.7 hPa
Savannah-Hilton Head International Airport, GA23 mi20 minN 310.00 miFair55°F48°F77%1015.4 hPa
Hunter U. S. Army Airfield, GA24 mi17 minN 010.00 miA Few Clouds56°F44°F62%1014.9 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)
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Tide / Current Tables for Skull Creek, south entrance, Hilton Head Island, South Carolina
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Skull Creek
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Tue -- 02:46 AM EDT     Moonset
Tue -- 02:54 AM EDT     7.07 feet High Tide
Tue -- 03:00 AM EDT     First Quarter
Tue -- 06:47 AM EDT     Sunrise
Tue -- 09:11 AM EDT     1.39 feet Low Tide
Tue -- 01:02 PM EDT     Moonrise
Tue -- 03:33 PM EDT     6.13 feet High Tide
Tue -- 07:56 PM EDT     Sunset
Tue -- 09:33 PM EDT     1.24 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.866.87.16.65.64.22.91.91.41.62.43.54.65.566.15.54.43.22.11.41.32

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Tue -- 12:16 AM EDT     1.72 knots Max Flood
Tue -- 02:46 AM EDT     Moonset
Tue -- 03:00 AM EDT     First Quarter
Tue -- 03:53 AM EDT     -0.00 knots Slack
Tue -- 06:33 AM EDT     -1.58 knots Max Ebb
Tue -- 06:48 AM EDT     Sunrise
Tue -- 10:23 AM EDT     0.00 knots Slack
Tue -- 12:50 PM EDT     1.33 knots Max Flood
Tue -- 01:03 PM EDT     Moonrise
Tue -- 04:25 PM EDT     -0.00 knots Slack
Tue -- 06:58 PM EDT     -1.31 knots Max Ebb
Tue -- 07:56 PM EDT     Sunset
Tue -- 10:28 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.61.10.6-0.1-0.9-1.5-1.5-1.3-1-0.30.51.21.31.10.70.3-0.4-1.1-1.3-1.2-0.9-0.40.5

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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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