Thursday, April22, 2021
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Marine Weather and Tides
Thunderbolt, 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 10:02 PM EDT (02:02 UTC) Moonrise 2:11PMMoonset 3:10AM Illumination 85% 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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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 716 Pm Edt Thu Apr 22 2021
Tonight..E winds 10 kt. Seas 2 to 3 ft.
Fri..E winds 5 to 10 kt. Seas 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 in the afternoon. 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 4 to 6 ft, subsiding to 4 to 5 ft after midnight. Showers with a chance of tstms in the evening, then showers likely after midnight.
Sun..NW winds 10 to 15 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the afternoon. A slight chance of showers in the morning.
Sun night..N winds 10 kt. Seas 2 to 3 ft.
Mon..NE winds 10 to 15 kt. Seas 2 to 3 ft.
Mon night..E winds 5 to 10 kt. Seas 2 to 3 ft.
Tue..E winds 10 kt. Seas 2 ft.
Tue night..SE winds 10 to 15 kt. Seas 2 to 3 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 716 Pm 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 Thunderbolt, GA
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location: 32.04, -81.04     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 222325 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 725 PM 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 /UNTIL 6 AM FRIDAY MORNING/. Early this evening: No significant changes made to the going forecast. High pressure will prevail across the region tonight resulting in good radiational cooling conditions with the combination of calm winds and clear skies. We did cool lows a degree in some inland typical cool spots. The forecast calls for upper 30s away from the immediate coastline, and we can't completely rule out a couple of mid 30s as well. There should be enough temperature/dewpoint spread to preclude much if any frost.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/. Friday: High pressure will slowly drift away from the area and one last rain-free day is expected. Though, as a potent shortwave approaches from the west, moisture and cloud cover will gradually increase. High temperatures will range in the upper 60s to mid 70s. Low temperatures will be in the mid to upper 50s inland and low 60s just along the coast.

Saturday: By early morning, a warm front should lift north across the region, putting the area comfortably in the warm sector. All the while, an upper trough and a surface low will trek eastward, advecting plentiful moisture into the area throughout the day. A cold front will swiftly cross the region overnight Saturday. Rain chances will gradually pick up before daybreak across inland areas as PWATs increase to over an inch. Then, as shortwave energy and forcing for ascent increases during the morning and into the afternoon, rain chances will increase to around 80-100% as PWATs increase to over 1.5 inches. For rain amounts, guidance suggests 1-2 inches, though there could be locally higher amounts. As the area has remained quite dry recently, the threat of widespread flooding is low. Though, if heavier rain occurs over low-lying/urban areas, there could be isolated flooding. Thunderstorms will also be possible. High temperatures will be in the 70s. Low temperatures will be in the upper 50s to mid 60s.

The biggest question for Saturday will be the extent of severe weather and the intensity of thunderstorms as the warm front lifts north. With the latest model runs, SBCAPE is not overly impressive, with most instability over far SE GA and over the waters (max 1500 J/kg). Aside from the instability, there will be sufficient shear to support the development of organized convection due to an impressive mid-level jet. SPC has outlooked the entire area in a Slight Risk for Saturday. Damaging winds, large hail and isolated tornadoes will all be possible.

Winds will become quite gusty as the area becomes situated in between high pressure offshore and the approaching low pressure system. The pressure gradient will tighten and wind gusts are expected to be in the 25-35 mph range. A Lake Wind Advisory for Lake Moultrie could be needed.

Sunday: Once the cold front moves through the area early morning, the area should dry out quickly and a mostly sunny day is expected. High temperatures will be in the mid 70s to low 80s.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. High pressure will prevail across the area and a mostly dry week is expected with plenty of sunshine. As heights rise, a gradual warming trend will also occur and by Thursday, high temperatures will be close to the upper 80s in some areas.

AVIATION /23Z THURSDAY THROUGH TUESDAY/. VFR conditions will prevail through 00z Saturday.

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. Tonight: Winds this evening will remain up around 10 knots, or 10-15 knots at times, out of the south. Overnight, winds will diminish to be 5 knots or less. Seas will average 1-3 ft.

Friday through Tuesday: High pressure will be the dominate feature across the area on Friday. Winds should be less than 15 knots with seas at 1 to 3 feet. Then on Saturday, a storm system will approach the region and winds and seas will both increase. Small Craft Advisories are likely for all marine zones through daybreak Sunday. Once the cold front shifts across the waters, winds and seas should subside quickly and tranquil marine conditions are expected thereafter.

Rip Currents: A Moderate Risk is in place for Saturday due to increased winds and elevated seas.

FIRE WEATHER. RH values of 25-30% are expected inland Friday afternoon, although winds will top out around 10-15 mph. Per coordination with state and federal agencies and surrounding NWS offices, a Fire Danger Statement has been issued for Friday. This includes all of southeast South Carolina, and much of southeast Georgia away from the coast.

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 . BSH SHORT TERM . LONG TERM . AVIATION . BSH MARINE . BSH FIRE WEATHER . CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi45 min 66°F1022 hPa
41033 37 mi55 min S 7.8 G 12 58°F 67°F1020.8 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi73 min SE 5.8 G 5.8 59°F 66°F2 ft1021.5 hPa (+0.8)37°F
SAXG1 - Sapelo Island Reserve, GA 45 mi63 min SE 2.9 50°F 1021 hPa (+0.0)44°F
ACXS1 - ACE Basin Reserve, SC 47 mi78 min S 1 55°F 1021 hPa42°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, GA6 mi67 minN 010.00 miFair53°F36°F52%1021 hPa
Savannah-Hilton Head International Airport, GA11 mi70 minS 610.00 miA Few Clouds52°F37°F57%1021.4 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi68 minN 010.00 miLight Drizzle54°F37°F54%1021.7 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE5NE4E12E12E15E13E16E10E10E9
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SE7E7E6E3

Tide / Current Tables for Thunderbolt, Wilmington River, Georgia
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Thunderbolt
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Thu -- 04:10 AM EDT     Moonset
Thu -- 04:55 AM EDT     7.92 feet High Tide
Thu -- 06:47 AM EDT     Sunrise
Thu -- 11:09 AM EDT     0.85 feet Low Tide
Thu -- 03:11 PM EDT     Moonrise
Thu -- 05:34 PM EDT     7.52 feet High Tide
Thu -- 07:58 PM EDT     Sunset
Thu -- 11:37 PM EDT     0.57 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.93.45.16.67.67.97.46.14.52.81.50.91.22.33.85.46.77.47.46.65.33.620.8

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Thu -- 02:12 AM EDT     1.96 knots Max Flood
Thu -- 04:09 AM EDT     Moonset
Thu -- 05:46 AM EDT     -0.00 knots Slack
Thu -- 06:46 AM EDT     Sunrise
Thu -- 08:37 AM EDT     -1.80 knots Max Ebb
Thu -- 12:07 PM EDT     0.00 knots Slack
Thu -- 02:39 PM EDT     1.76 knots Max Flood
Thu -- 03:10 PM EDT     Moonrise
Thu -- 06:17 PM EDT     -0.00 knots Slack
Thu -- 07:57 PM EDT     Sunset
Thu -- 09:18 PM EDT     -1.73 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.61.51.91.81.30.7-0.2-1.2-1.7-1.8-1.6-1.1-0.10.91.61.71.40.90.2-0.7-1.4-1.7-1.7-1.3

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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