Tuesday, April7, 2020
Privacy Policy
L-36.com


Marine Weather and Tides
Thunderbolt, GA

Version 3.4
NOTICE
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 7:02AMSunset 7:49PM Tuesday April 7, 2020 9:49 PM EDT (01:49 UTC) Moonrise 6:32PMMoonset 6:02AM Illumination 100% Phase: Full Moon; Moon at 15 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
    EDIT      (on/off)   Help
AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 647 Pm Edt Tue Apr 7 2020
Tonight..SW winds 10 to 15 kt. Seas 2 to 3 ft.
Wed..SW winds 10 to 15 kt. Seas 2 ft. A chance of showers and tstms in the afternoon.
Wed night..SW winds 10 to 15 kt. Seas 2 ft. A chance of showers and tstms in the evening.
Thu..W winds 10 to 15 kt. Seas 2 ft.
Thu night..W winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers after midnight.
Fri..NW winds 10 to 15 kt. Seas 2 ft. A slight chance of showers.
Fri night..N winds 10 kt. Seas 2 to 3 ft.
Sat..E winds 10 kt. Seas 2 ft.
Sat night..SE winds 10 to 15 kt. Seas 2 ft. A chance of showers.
Sun..S winds 15 to 20 kt. Seas 3 to 4 ft. A chance of showers with a slight chance of tstms.
Sun night..SW winds 15 to 20 kt. Seas 4 to 5 ft. A chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 647 Pm Edt Tue Apr 7 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A series of disturbances will pass overhead through Wednesday. A cold front will move through Thursday night, followed by high pressure into Saturday. A significant storm system could impact the area during the first part of next week.


7 Day Forecast for Marine Location Near Thunderbolt, GA
   Hourly   EDIT   Help
location: 32.04, -81.04     debug


Area Discussion for - Charleston, SC
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS62 KCHS 072306 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 706 PM EDT Tue Apr 7 2020

SYNOPSIS. A series of disturbances will pass overhead through Wednesday. A cold front will move through Thursday night, followed by high pressure into Saturday. A significant storm system could impact the area during the first part of next week.

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/. There will remain at least a few light showers across Georgia this evening with the passage of a short wave, but little to no measurable rainfall will occur. Otherwise, mostly cloudy to cloudy skies prior to midnight will give way to little less cloud cover overnight. Guidance continues to give mixed results regarding any late night showers and possible isolated t-storms late, so we left as is for now, with just a slight chance far interior georgia after 5 am. Given the extensive cloudiness early on we did slow down the hourly temp decrease. We will be close to record high mins for both April 7 and 8 at our climate sites (See CLIMATE section below).

Previous discussion . Moisture will steadily increase from the west this evening and overnight. PWATs will range from 1.5 to 1.7" by daybreak Wednesday. Downslope flow today has stifled convective development thus far, however a potent shortwave moving in late this afternoon should trigger at least isolated showers and tstms across the area. A lull in precipitation is anticipated later this evening with the loss of diurnal heating. However, another upper shortwave will move into southeast GA late tonight, potentially triggering some convection across inland areas. We kept a mention of thunderstorms late tonight due to some elevated instability showing up in model guidance. Low temps will be in the middle 60s.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/. Wednesday: A generally flat upper level ridge axis from the Gulf of Mexico into the Mississippi Valley at the start of the period will gradually weaken. Weak upper level disturbances in the west to northwest flow aloft combined with afternoon CAPE values from 600 to 1200 J/KG could result in widely scattered to scattered showers and some thunderstorms, especially in the south where deeper moisture and the higher instability should exist. The lack of a low level focus is a limiting factor that will keep rain chances fairly low. With afternoon DCAPE values from 600 to 800 J/KG, if thunderstorms become organized, they could become strong with gusty winds. The rain chances should end during the evening with the loss of heating. Despite abundant high level clouds, downslope flow and 850 millibar temperatures near 15 degrees Celsius support high temperatures in the mid 80s away from the coast.

Thursday: Downslope west to northwest flow throughout much of the lower part of the atmosphere will continue. Models indicating large scale sinking and this combined with nothing more than weak low level convergence support a rain free and hot forecast. With afternoon 850 millibar temperatures near 16 degrees Celsius, compressional heating ahead of the front and little if any cloud cover, expect high temperatures on Thursday to be at least several degrees warmer than those of Wednesday. Currently am forecasting near record highs near 90 away from the coast, but with the offshore winds expected for just about the entire day, it will be quite warm near the beaches too. A mainly dry but significant front moves through the area Thursday night. A few showers will be possible along the front in the far south late.

Friday: In response to a significant upper level disturbance moving into the northwest Atlantic ocean, much cooler and drier air will spread into the area. It will be cloudy for the morning with clearing skies expected in the afternoon as much drier air moves in. Despite downslope northwesterly low level winds, highs should only range from near 70 in the north to the lower 70s in the south, a solid 20 degrees cooler than the highs on Thursday for most areas. There will be a slight chance for showers in the south early in the day near the cold front.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/. The 00Z models finally started to come into some alignment for the long term. High pressure to our northwest should bring dry conditions and cooler temperatures Friday night into Saturday. Saturday night into Sunday a strengthening storm system moves from the Gulf Coast to the Southeastern U.S. Models all seem to key on a large area of heavy rainfall, but they disagree on what part of the Southeast gets it and when. Impacts for our area could range anywhere from some light rain to possibly several inches of rain. Given the wide variation, we went with high end chance POPs with the anticipation more changes will be needed.

AVIATION /00Z WEDNESDAY THROUGH SUNDAY/. KCHS: VFR with the 00Z TAF set. Chances of convection Wednesday afternoon is too low to consider including at this time.

KSAV: VFR through the night. Isolated convection possible Wednesday morning, but probability is way too low to warrant a mention. Instead there is a chance for MVFR stratocumulus overspreading KSAV from around 12-17Z. We might need to include mention SHRA/TSRA in later TAFs for Wednesday afternoon.

Extended Aviation Outlook: Other than perhaps some MVFR cigs behind the cold front later Thursday night into early Friday, VFR conditions are expected through Saturday.

MARINE. Tonight: The gradient will remain somewhat packed between high pressure to the southeast and a lee side trough to the northwest. That along with some of the 25-30 kt winds in the lower levels mixing down we generate SW winds as high as 15 kt most waters, but up to 15-20 kt on the AMZ350 waters. With still some swell energy over the Atlantic, significant wave heights will average 2-4 ft throughout.

Wednesday through Saturday: An area of low pressure off of the middle Atlantic coast will result in generally southwest winds of 10 to 20 knots through Thursday. A cold front will move through Thursday night resulting in the winds shifting to the northwest for Friday and then light northeast winds will become east to southeast Saturday. Seas of 2 to 4 feet are expected into Friday and then tranquil conditions with seas of 1 to 3 feet are expected later Friday into Saturday.

TIDES/COASTAL FLOODING. Latest tidal trends support maintaining the Coastal Flood Advisory for the entire coast with the high tide around 830-930 pm this evening.

Higher than normal tides are expected most of this week due to astronomical influences from the upcoming full moon and perigee. Additionally, winds are forecast to be onshore at times with ocean swell, which would further elevate the tides. As a result, minor to perhaps moderate coastal flooding is expected with each high tide through Thursday. Coastal Flood Advisories will be needed. By Friday, offshore winds should lessen the chance of coastal flooding.

CLIMATE. Record high minimum temperatures for April 7th: CXM . 66 degrees last set in 1999 (low so far 67 degrees)

Record high minimum temperatures for April 8th: CHS . 66 degrees last set in 1999 SAV . 70 degrees set in 1882 CXM . 68 degrees last set in 1991

Record high temperatures for Thursday April 9th: CHS . 90 degrees set in 2011 SAV . 91 degrees set in 2011 Downtown Charleston . 89 degrees last set in 2001

CHS WATCHES/WARNINGS/ADVISORIES. GA . Coastal Flood Advisory until 10 PM EDT this evening for GAZ117- 119-139-141. SC . Coastal Flood Advisory until 10 PM EDT this evening for SCZ048>051. MARINE . None.

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


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi49 min WSW 6 G 8 76°F 68°F1015.1 hPa (-0.3)
41033 37 mi41 min SW 14 G 19 70°F 68°F1013.6 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi59 min SSW 7.8 G 9.7 69°F 68°F2 ft1015.3 hPa (+0.0)67°F
SAXG1 - Sapelo Island Reserve, GA 45 mi49 min SSW 2.9 72°F 1016 hPa (+0.0)66°F
ACXS1 - ACE Basin Reserve, SC 47 mi64 min Calm 73°F 1014 hPa67°F

Wind History for Fort Pulaski, GA
(wind in knots)    EDIT      (on/off)   Help
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
Last
24hr
SW7
G11
SW6
G9
SW7
G10
SW5
G8
SW4
SW5
G8
SW4
G7
SW4
G7
W5
SW5
SW5
G8
SW7
G11
SW8
G12
SW6
G9
SW7
G10
SW7
G10
SW8
G12
S5
G9
S8
G12
SW8
G11
S4
G7
SW5
G9
SW5
G8
W6
1 day
ago
--
--
NW1
NW1
W2
NW1
--
N2
NW2
W1
NW3
NW4
NW2
NW2
SW6
S5
G9
S7
G11
S8
G13
S8
G12
S6
G11
S7
G13
S6
G11
S6
G11
S7
G11
2 days
ago
SE4
SE4
SE4
SE6
SE5
G8
SE6
SE6
SE6
E8
SE7
E8
SE6
E10
E10
G13
E9
E9
E9
E9
E10
E9
E8
E8
SE4
SE2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA6 mi53 minWSW 710.00 miA Few Clouds76°F62°F63%1014.5 hPa
Savannah-Hilton Head International Airport, GA11 mi56 minWSW 810.00 miOvercast77°F60°F56%1014.9 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi54 minN 010.00 miFair72°F66°F83%1014.9 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
Last 24hrS7S5S5S5S4SW6SW4S5SW5SW5SW3--SW7SW5S7SW7S9--SW8SW10SW7W8W9SW7
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS5SW8SW5S6S8SE10S9S12S10S8S7
2 days agoE3E3CalmCalmCalmCalmE4E5E3E4E5E6E7E11
G17
E10E11E12E11E11SE8SE9SE7SE4Calm

Tide / Current Tables for Thunderbolt, Wilmington River, Georgia
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Thunderbolt
Click for Map
Tue -- 02:26 AM EDT     -1.40 feet Low Tide
Tue -- 07:01 AM EDT     Moonset
Tue -- 07:04 AM EDT     Sunrise
Tue -- 08:43 AM EDT     9.56 feet High Tide
Tue -- 02:46 PM EDT     -1.31 feet Low Tide
Tue -- 07:33 PM EDT     Moonrise
Tue -- 07:48 PM EDT     Sunset
Tue -- 09:12 PM EDT     10.00 feet High Tide
Tue -- 10:35 PM EDT     Full Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
30.4-1.2-1.20.32.85.57.89.39.58.56.43.81.2-0.8-1.3-0.224.77.39.2109.68

Tide / Current Tables for Savannah River Entrance, Georgia Current
   EDIT      (on/off)   Help   One Week of Data
Savannah River Entrance
Click for Map
Tue -- 12:21 AM EDT     -2.57 knots Max Ebb
Tue -- 03:10 AM EDT     0.00 knots Slack
Tue -- 05:50 AM EDT     2.63 knots Max Flood
Tue -- 07:00 AM EDT     Moonset
Tue -- 07:03 AM EDT     Sunrise
Tue -- 09:24 AM EDT     -0.00 knots Slack
Tue -- 12:32 PM EDT     -2.50 knots Max Ebb
Tue -- 03:27 PM EDT     0.00 knots Slack
Tue -- 06:09 PM EDT     2.63 knots Max Flood
Tue -- 07:32 PM EDT     Moonrise
Tue -- 07:47 PM EDT     Sunset
Tue -- 09:49 PM EDT     -0.00 knots Slack
Tue -- 10:35 PM EDT     Full Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
-2.5-2.5-1.7-0.31.32.42.62.31.60.5-0.8-1.9-2.4-2.5-1.9-0.70.82.12.62.41.81-0.2-1.6

Weather Map
       (on/off)   Help Weather Map
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (21,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Charleston, SC
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.