Saturday, September19, 2020
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Marine Weather and Tides
Thunderbolt, GA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:09AMSunset 7:25PM Saturday September 19, 2020 2:03 PM EDT (18:03 UTC) Moonrise 8:30AMMoonset 8:15PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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- 155 Pm Edt Sat Sep 19 2020
.small craft advisory in effect through late Tuesday night...
This afternoon..NE winds 25 kt with gusts to 30 kt. Seas 5 to 7 ft.
Tonight..NE winds 25 to 30 kt. Seas 5 to 7 ft, building to 6 to 8 ft after midnight.
Sun..NE winds 20 to 25 kt with gusts to 30 kt. Seas 6 to 8 ft.
Sun night..NE winds 20 to 25 kt with gusts to 30 kt. Seas 7 to 9 ft.
Mon..NE winds 20 to 25 kt with gusts to 30 kt. Seas 7 to 9 ft.
Mon night..NE winds 20 to 25 kt with gusts to 30 kt. Seas 6 to 8 ft.
Tue..NE winds 15 to 20 kt. Seas 5 to 7 ft.
Tue night..NE winds 5 to 10 kt. Seas 4 to 5 ft.
Wed..E winds 5 to 10 kt. Seas 3 to 4 ft.
Wed night..E winds 5 kt. Seas 3 to 4 ft.
AMZ300 155 Pm Edt Sat Sep 19 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Strong high pressure will gradually build into the area over the weekend and will persist through 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 191801 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 201 PM EDT Sat Sep 19 2020

SYNOPSIS. Strong high pressure will gradually build into the area over the weekend and will persist through next week.

NEAR TERM /THROUGH TONIGHT/. 130PM: No major changes made. Models hint at light showers over the far inland counties overnight due to upper-level influences; however, rain will most likely not reach the surface. PoPs are around 15% inland for a few hours overnight to reflect this trend.

10AM: No changes to PoPs even though some light returns are seen on radar in regions outside the forecast area. Precipitation is not expected to reach the surface, as dry low- level air (as seen on model soundings) should evaporate any elevated rainfall, if any forms. Winds and wave heights were slightly adjusted to match current observations.

Today: No big changes with the latest update. High pressure will continue to build from the north as most of the low-level moisture pushing to the southeast closer to the GA coast. Abundant high clouds expected however due to upper troughing/jetting. Could see a few showers, especially near the GA coast where the best moisture convergence is expected but overall it will be dry. Temperatures will be unseasonably cool with highs in the mid to upper 70s, although a stiff northeast breeze will make it feel chillier.

Tonight: Unseasonably cool temperatures expected due to cold air advection from building high pressure to the north. Could see a few showers, especially near the GA coast, but most areas will remain dry. Lows should range from the mid to upper 50s inland to the mid to upper 60s at the coast, warmest in GA, with a decent northeast breeze making it feel a bit cooler however.

SHORT TERM /SUNDAY THROUGH TUESDAY/. Sunday through Tuesday: A surface high pressure centered over the great lakes will gradually deepen and slowly shift eastward this weekend. As ridging persists across the southeast, a wedge pattern will set up and the pressure gradient will continue to tighten. Gusty northeast winds are likely to prevail along the coast through Tuesday. Due to substantial subsidence and lack of instability, precipitation is not expected across most of the area. Lingering moisture will push further from the coast on Sunday and an isolated shower cannot be ruled out along or just offshore the far southeast Georgia coast. Monday and Tuesday look to be rainfree with plenty of sunshine.

Winds are expected to remain gusty over Lake Moultrie through Sunday. For now, have capped winds at 23 knots but a Lake Wind Advisory could be needed.

High and low temperatures will continue to be below normal by about 10 degrees for this time of year. Generally, high temperatures will be in the low to mid 70s each day. Lows will be in the low to mid 50s inland with upper 50s/low 60s along the coast.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/. Strong high pressure will prevail across the area. By Wednesday, high temperatures will be back to normal for this time of year. Low temperatures will gradually increase each day to mid to upper 60s inland and low 70s closer to the coast by the end of the week. While there is still a bit of uncertainty, low pressure could impact the region by late week. Slight chance POPs have been introduced starting Thursday. The best chance for precip looks to be Friday into Saturday when deeper moisture moves into the area.

AVIATION /18Z SATURDAY THROUGH THURSDAY/. High confidence for the 12Z TAFs at KCHS/KSAV. Conditions will mostly be VFR, although can't rule out some MVFR cigs at times, mainly late morning through early afternoon. Strong NE winds are expected with gusts near 20 kt at times, especially late morning/early afternoon.

Extended Aviation Outlook: MVFR is possible during periods of low clouds on Sunday. Gusty northeast 20-25 kt winds could persist into Monday. VFR will then prevail.

MARINE. Today/Tonight: Strong high pressure to the north will keep a tight pressure gradient in place across the SC/GA waters with solid Small Craft Advisory conditions expected across the nearshore waters and in Charleston Harbor with gales in the offshore GA waters. There is a small risk that a Gale Warning will be needed even for the nearshore waters at some point.

Sunday through Thursday: As deep high pressure builds across the area, the pressure gradient will tighten. Gusty northeast winds up to up to 25-30 knots are expected across all nearshore waters with seas up to 10 ft. Small Craft Advisories will remain in effect through late Tuesday/early Wednesday morning. Similar gusty winds can be expected in the Charleston Harbor with conditions improving by late Monday night.

For the Outer Georgia waters, a Gale Warning will remain in effect through late Monday. 15 foot seas will be possible with gusty northeast winds around 35-40 knots. As conditions gradually improve a Small Craft Advisory will be needed through Thursday morning for elevated winds and seas.

Rip Currents: A high risk of rip currents is expected through at least Sunday due to strong northeast winds and large swells from distant Hurricane Teddy. An elevated risk will likely continue beyond Sunday through early next week.

High Surf: Building seas this weekend could lead to 5+ foot breaking wave heights at the coast and thus High Surf Advisories could be needed. The combination of the high tides and potentially large breaking waves will likely lead to some beach erosion.

TIDES/COASTAL FLOODING. Significant coastal flooding during each of the daily high tide cycles is expected through at least Monday along the southern SC/northern GA coasts due to a combination of higher than normal astronomical tides, river discharge, swells from a distant hurricane and strong NE winds. Tidal departures are increasing quite a bit this morning and are likely to remain high through early next week. Peak water levels are likely to be comparable to the October 2015 event in GA and the Thanksgiving 2018 event in SC, although may even surpass both these events. It's worthy to note that at least minor flooding is likely for many hours each day around each of the high tide cycles, and flooding may occur well inland along rivers and creeks.

CHS WATCHES/WARNINGS/ADVISORIES. GA . High Rip Current Risk through Sunday evening for GAZ117-119- 139-141. Coastal Flood Watch from 8 PM this evening to 1 AM EDT Sunday for GAZ117-119-139-141. SC . High Rip Current Risk through Sunday evening for SCZ048>051. Coastal Flood Watch from 8 PM this evening to 1 AM EDT Sunday for SCZ048>051. MARINE . Small Craft Advisory until 8 PM EDT Tuesday for AMZ350-352. Small Craft Advisory until 3 AM EDT Wednesday for AMZ354. Gale Warning until 5 PM EDT Monday for AMZ374. Small Craft Advisory until 8 PM EDT Monday for AMZ330.



NEAR TERM . SHORT TERM . LONG TERM . AVIATION . MARINE . TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi46 min NNE 13 G 18 74°F 80°F1018.9 hPa
41033 37 mi56 min NE 19 G 27 73°F 81°F1018.3 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi74 min NNE 25 G 33 76°F 83°F8 ft1015.8 hPa (+0.4)71°F
SAXG1 - Sapelo Island Reserve, GA 45 mi64 min NNE 18 74°F 1017 hPa (+0.0)68°F
ACXS1 - ACE Basin Reserve, SC 47 mi79 min N 5.1 74°F 1019 hPa64°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 mi68 minNE 11 G 1810.00 miMostly Cloudy76°F62°F64%1018.2 hPa
Savannah-Hilton Head International Airport, GA11 mi71 minNNE 12 G 2010.00 miOvercast77°F63°F62%1018.7 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi74 minNE 14 G 1910.00 miPartly Cloudy75°F64°F69%1019 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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2 days agoNE4CalmNE3NE5NE4E4NE4NE4NE6NE4NE6NE5E10E5SE7SE7E7S7S10
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Tide / Current Tables for Thunderbolt, Wilmington River, Georgia
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Thunderbolt
Click for Map
Sat -- 04:19 AM EDT     -0.82 feet Low Tide
Sat -- 07:10 AM EDT     Sunrise
Sat -- 09:31 AM EDT     Moonrise
Sat -- 10:45 AM EDT     10.19 feet High Tide
Sat -- 04:51 PM EDT     -0.72 feet Low Tide
Sat -- 07:24 PM EDT     Sunset
Sat -- 09:15 PM EDT     Moonset
Sat -- 11:04 PM EDT     9.82 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.25.83.20.7-0.7-0.51.23.76.48.69.910.19.27.44.82.1-0-0.70.32.55.17.59.29.8

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 01:56 AM EDT     -2.66 knots Max Ebb
Sat -- 05:00 AM EDT     0.00 knots Slack
Sat -- 07:10 AM EDT     Sunrise
Sat -- 07:41 AM EDT     2.83 knots Max Flood
Sat -- 09:30 AM EDT     Moonrise
Sat -- 11:21 AM EDT     -0.00 knots Slack
Sat -- 02:37 PM EDT     -2.81 knots Max Ebb
Sat -- 05:36 PM EDT     0.00 knots Slack
Sat -- 07:23 PM EDT     Sunset
Sat -- 08:10 PM EDT     2.76 knots Max Flood
Sat -- 09:14 PM EDT     Moonset
Sat -- 11:43 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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-1.5-2.4-2.7-2.4-1.5-01.62.62.82.31.50.5-0.9-2.1-2.7-2.8-2.3-10.72.12.72.51.80.9

Weather Map
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wmap_A
GEOS Local Image of    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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Ground Weather Radar Station Charleston, SC
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