Thursday, April22, 2021
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Marine Weather and Tides
Tybee Island, GA

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 6:45AMSunset 7:59PM Thursday April 22, 2021 11:13 AM EDT (15:13 UTC) Moonrise 2:10PMMoonset 3:10AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 1025 Am Edt Thu Apr 22 2021
Rest of today..NE winds 15 to 20 kt, diminishing to 10 to 15 kt early this afternoon, then becoming se 5 to 10 kt late. Seas 3 to 4 ft, subsiding to 2 to 3 ft this afternoon.
Tonight..SE winds 5 kt. Seas 1 to 2 ft.
Fri..SE winds 5 to 10 kt. Seas 1 to 2 ft.
Fri night..SE winds 10 to 15 kt. Seas 2 to 3 ft.
Sat..SE winds 15 to 20 kt, becoming S 20 to 25 kt in the afternoon. Seas 3 to 4 ft, building to 4 to 6 ft. A chance of tstms. A chance of showers in the morning, then showers in the afternoon.
Sat night..SW winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 7 ft, subsiding to 4 to 6 ft. Showers with a chance of tstms in the evening, then showers likely with a slight chance of tstms after midnight.
Sun..W winds 10 to 15 kt. Seas 4 to 5 ft.
Sun night..N winds 10 to 15 kt. Seas 2 to 3 ft.
Mon..NE winds 10 to 15 kt. Seas 2 to 3 ft.
Mon night..E winds 10 kt. Seas 2 to 3 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1025 Am Edt Thu Apr 22 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through Friday, before a low pressure system impacts the region over the weekend. High pressure will return early next week.


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


Area Discussion for - Charleston, SC
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FXUS62 KCHS 221412 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1012 AM EDT Thu Apr 22 2021

SYNOPSIS. High pressure will prevail through Friday, before a low pressure system impacts the region over the weekend. High pressure will return early next week.

NEAR TERM /THROUGH TONIGHT/. Today: No significant changes were made with the latest update. Although forecast confidence is generally high there are some uncertainties regarding temperatures and resulting relative humidity. A very dry and unseasonably cool air mass will prevail today with some higher clouds from time to time. Breezy winds this morning will subside later as high pressure gains more influence. Highs should be in the 65-70 degree range for most inland areas, warmest in GA. A weak sea breeze circulation is likely to form along the beaches by late afternoon which will help to keep highs there closer to 60.

Tonight: The boundary layer will decouple quickly after sunset as high pressure shifts over the area. With low dewpoints and clear skies expected to dominate, temperatures should fall quickly as strong radiational cooling prevails. Generally favored the cooler side of guidance given recent model performance in dry, radiational cooling regimes, but did not go quite as cold some some of the guidance would suggest given this would be a rather large jump from yesterday afternoon's forecast cycle. The updated forecast shows lows ranging from the upper 30s inland with lower-mid 50s along at the beaches, Downtown Charleston and around the Santee-Cooper lakes, but would not be surprised if these needed to be trended down with later update cycles. Frost is not a big concern at this time with lows only dropping into the upper 30s, although some very patchy frost can not be completely ruled out in some of the normally colder spots in the Francis Marion National Forest.

SHORT TERM /FRIDAY THROUGH SUNDAY/. High pressure centered over the mid-Atlantic states Friday morning will transition offshore through the day in advance of the next weather system. Expect increasing cloud cover with highs around 5 degrees below normal, mainly in the lower to middle 70s. Mild temperatures for Friday night with warm air advection. Lows will range from the mid 50s across the interior to low 60s near the coast.

The focus of the forecast will be on the weekend system as it brings the only rain chances of the week. A potent shortwave and associated surface low will lift out of the Southern Plains Friday night and track towards the East Coast on Saturday. As this occurs, the forecast area will become positioned within the warm sector following a warm front lifting north through the area. A trailing cold front will eventually pass through Saturday night. Strong moisture transport will bring PWats to over 1.5 inches, which is well above late April climatology. This deep moisture will combine with large scale forcing for ascent from shortwave energy and upper divergence to support increasing coverage of showers and thunderstorms. Rain chances peak 90-100% in the afternoon and evening. Storm total rainfall is forecast to be between 1-2 inches, highest across the interior. Given the dry antecedent conditions, the area should be able to handle these amounts and the flooding threat will be limited. However, certainly could see some ponding on roads in urban areas within any pockets of heavier rainfall.

Attention then turns to the potential for severe weather. Wind fields are certainly supportive of storm organization with shear of over 50 knots. Latest model guidance is showing the airmass becoming weakly to moderately unstable with CAPE generally 500 to 1500 J/kg, highest across our Georgia zones. All hazards will be possible, including damaging wind gusts, large hail, and even isolated tornadoes given low level helicity values and nice curving hodographs. This threat remains highlighted within the Hazardous Weather Outlook.

Even outside of showers/thunderstorms, winds will get gusty, generally peaking in the 25-30 mph range. Conditions could become supportive of a Lake Wind Advisory over Lake Moultrie. Otherwise, temperatures are forecast to average in the mid to upper 70s.

Rain chances will decrease Saturday night, especially after midnight, as convective activity pushes offshore. Low pressure will continue to lift northeast away from the area on Sunday, allowing high pressure to build in. A dry forecast has been maintained.

LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/. Models remain in very good agreement for next week. High pressure will build over the region and eventually transition into the western Atlantic by the middle of the week. Subsidence and dry air will maintain quiet weather and minimal rain chances. Temperatures will be near to above normal, warming with time, as heights build aloft.

AVIATION /14Z THURSDAY THROUGH MONDAY/. KCHS/KSAV: VFR through 12Z Friday. Few gusts near 20 kt possible this morning.

Extended Aviation Outlook: Flight restrictions are possible Saturday into Saturday night as a low pressure system impacts the area. Gusty winds also expected on Saturday.

MARINE. Today: Improving conditions under building high pressure. Small Craft Advisories will end this morning with winds dropping below 25 kt and seas dropping below 6 ft.

Tonight: There are no concerns with fairly low winds expected as high pressure traverses the local marine area. Seas will average 1-3 ft.

Friday through Tuesday: No marine concerns for Friday as high pressure remains the dominant feature. Winds and seas will then increase Saturday into Saturday night as a low pressure system impacts the area. Small Craft Advisories appear likely for most, if not all waters, including the Charleston Harbor. Conditions will improve on Sunday. High pressure will return for early to middle of next week, with no additional headlines expected.

FIRE WEATHER. A very dry air mass in place will support minimum relative humidity near 20% inland. Per coordination with state and federal agencies yesterday, a Fire Danger Statement will be maintained for all but the Coastal McIntosh and Coastal Liberty zones where RH should be higher than 25%. Winds will gust near 20 mph this morning but then diminish this afternoon when the lower RHs are expected. Critical to near critical RH of 25-30% is expected inland Friday afternoon, although winds will only be about 10-15 mph.

CLIMATE. Record Lows for 23 April: KCHS: 39/1993 KCXM: 44/1927 KSAV: 38/1993

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



NEAR TERM . RJB SHORT TERM . LONG TERM . AVIATION . MARINE . FIRE WEATHER . CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 3 mi80 min 65°F1023.8 hPa
41033 29 mi126 min NE 18 G 27 50°F 66°F1022.7 hPa
ACXS1 - ACE Basin Reserve, SC 42 mi89 min N 5.1 50°F 1023 hPa25°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi84 min NE 18 G 23 54°F 66°F5 ft1022.1 hPa (+2.4)37°F
SAXG1 - Sapelo Island Reserve, GA 48 mi74 min NE 14 56°F 1023 hPa (+2.0)38°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 mi24 minNE 13 G 2110.00 miFair54°F23°F30%1024 hPa
Hunter U. S. Army Airfield, GA16 mi18 minNNW 1010.00 miFair55°F21°F26%1023.3 hPa
Savannah-Hilton Head International Airport, GA20 mi21 minENE 1010.00 miA Few Clouds54°F21°F28%1023.9 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)
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E6E6E6E4SE3CalmCalmCalmS3S4CalmCalmCalmCalmW5W5W5W5N7
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NW7NW4CalmCalmCalmCalmCalmCalm4346E5E5E5E5E6
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Tide / Current Tables for Tybee Light, Savannah River, Georgia
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Tybee Light
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Thu -- 04:09 AM EDT     Moonset
Thu -- 04:13 AM EDT     6.82 feet High Tide
Thu -- 06:46 AM EDT     Sunrise
Thu -- 10:45 AM EDT     0.74 feet Low Tide
Thu -- 03:10 PM EDT     Moonrise
Thu -- 04:52 PM EDT     6.47 feet High Tide
Thu -- 07:57 PM EDT     Sunset
Thu -- 11:13 PM EDT     0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.23.75.26.36.86.65.74.53.11.810.81.42.645.36.26.565.13.82.41.20.5

Tide / Current Tables for Savannah River Entrance, Georgia Current (2) (expired 1999-12-31)
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Savannah River Entrance
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Thu -- 12:03 AM EDT     0.00 knots Slack
Thu -- 02:23 AM EDT     1.34 knots Max Flood
Thu -- 04:09 AM EDT     Moonset
Thu -- 05:10 AM EDT     -0.00 knots Slack
Thu -- 06:46 AM EDT     Sunrise
Thu -- 09:14 AM EDT     -2.30 knots Max Ebb
Thu -- 12:44 PM EDT     0.00 knots Slack
Thu -- 02:57 PM EDT     1.31 knots Max Flood
Thu -- 03:10 PM EDT     Moonrise
Thu -- 05:47 PM EDT     -0.00 knots Slack
Thu -- 07:57 PM EDT     Sunset
Thu -- 09:40 PM EDT     -2.22 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-00.81.31.20.70.1-0.5-1.2-1.9-2.3-2.1-1.6-0.70.211.310.5-0.1-0.8-1.5-2.1-2.2-1.8

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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