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Marine Weather and Tides Thunderbolt, GA Version 3.4

What's New / NOTES 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues. 6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

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Sunrise 6:45AM

Sunset 7:58PM

Saturday April 21, 2018 5:42 AM EDT (09:42 UTC)

Moonrise 10:36AM

Moonset 12:00AM

Illumination 35%

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.

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Marine Forecasts

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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 319 Am Edt Sat Apr 21 2018 Today..E winds 15 to 20 kt. Seas 4 to 5 ft. Tonight..E winds 15 to 20 kt. Seas 4 to 5 ft. Sun..E winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Seas 4 to 5 ft. A slight chance of showers in the morning, then a chance of showers in the afternoon. Sun night..E winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 6 ft, building to 5 to 7 ft after midnight. A chance of showers in the evening, then showers after midnight. Mon..SE winds 20 to 25 kt with gusts to 30 kt. Seas 6 to 8 ft. Showers with a slight chance of tstms. Mon night..SE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 6 to 8 ft, subsiding to 5 to 7 ft after midnight. Showers with a slight chance of tstms in the evening, then a chance of showers after midnight. Tue..S winds 10 to 15 kt. Seas 4 to 6 ft. A slight chance of showers. Tue night..SW winds 10 kt. Seas 4 to 5 ft. A slight chance of showers. Wed..W winds 10 kt. Seas 3 to 4 ft. Wed night..W winds 10 kt. Seas 3 to 4 ft. Mariners are reminded that winds and seas higher in and near tstms.

AMZ300 319 Am Edt Sat Apr 21 2018 Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Cool and dry high pressure will prevail into Sunday. A low pressure system will approach the area late Sunday and will then slowly move up the coast through the middle of next week. Weak high pressure will return late next week.

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7 Day Forecast for Marine Location Near Thunderbolt, GA

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Area Discussion for - Charleston, SC

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Fxus62 kchs 210803 afdchs area forecast discussion national weather service charleston sc 403 am edt Sat apr 21 2018 Synopsis Cool and dry high pressure will prevail into Sunday. A low pressure system will approach the area late Sunday and will then slowly move up the coast through the middle of next week. Weak high pressure will return late next week. Near term through tonight Early this morning: a humongous range of temps from north to south, ranging from as cold as the upper 30s-lower 40s in places such as witherbee, walterboro and summerville to as warm the lower 60s in mcintosh county and at fort pulaski and hilton head. Broken stratocumulus and altocumulus clouds will cover locations near and south of savannah prior to daybreak, while the rest of the forecast region will be clear with no more than a few thin cirrus clouds. For today: flat ridging will develop in between one deep cyclone just offshore of eastern canada and a deep cu-off low heading eastward through the panhandles of texas and oklahoma. Surface high pressure near the mason-dixon line early will shift toward the DELMARVA this afternoon, supplying the region with a constant fetch off the atlantic. This along with isentropic ascent will allow for increasing stratocumulus and altocumulus clouds to impact much of SE georgia, with no more than few to scattered flat cumulus and stratocumulus elsewhere. Some of the hi-res models hint at a few very light showers or sprinkles near the altamaha river basin, but we have maintained a rainfree forecast with a solid subsidence cap in place across the vast majority of locations. The flow off the ocean and h8 temps that are only 8-9c or about 1 standard deviation below normal, will limit MAX temps to the upper 60s and lower 70s most communities. Exceptions will be the immediate coast where middle 60s are more common and maybe a few mid 70s near and west of us-301, where they are furthest from the atlantic and where there is sufficient insolation. A decent pressure gradient around the surface high will generate breezy e-ne winds, averaging 20-25 mph along the coast, and 10-20 mph further inland. Tonight: flat mid level ridging will prevail aloft in advance of the cut- off low that shifts toward the ARKLATEX and eastern oklahoma. Surface high pressure holds firmly in place to the n-ne as low pressure develops in close proximity to the cyclone aloft over the central part of the country. Strengthening isentropic ascent and a continued influx of low level moisture off the ocean will lead to increasing cloudiness from s-sw to n-ne. However, there is enough time for temps to cool to the upper 40s and lower 50s across much of the charleston quad- county district away from the coast and maybe allendale and hampton counties before clouds move in after midnight. Most other areas will only get down to the mid and upper 50s. There could be a few showers heading toward the coast of south carolina late with the low level convergence, plus some showers making their way toward the altamaha river toward morning where the strongest isentropic ascent and deepest moisture will reside. Short term Sunday through Tuesday An active and wet period on tap for the southeast early in the week. A closed upper low and associated surface reflection will drift east across the gulf coast states on Sunday. Cloud cover will thicken and there could be a few showers, but largely the bulk of the rainfall is expected to be later Sunday into Monday when the deepest moisture arrives. Pops are generally in the 20-30% range. Cool onshore flow will keep high temperatures below normal. The low pressure system will continue to approach Sunday night with a warm front progged to lift north into the area on Monday. Ample forcing for ascent will overspread the area - shortwave energy, upper diffluence, and isentropic ascent. These features will combine with precipitable water values near climatological maximums (1.6-1.7 inches) to produce widespread showers, spreading from south to north. Marginal instability along and south of the warm front will support a mention of thunder, which will mainly be across the georgia zones during the day. Severe threat appears low at this time. Of bigger concern would be flooding potential, but luckily given antecedent conditions it appears less likely. Current storm total rainfall has most areas seeing at least 2-3 inches, with some higher amounts possible. Otherwise, easterly winds will increase through the day as the forecast area becomes positioned between the approaching low and stubborn high pressure to the north. Wind gusts will be around 25-30 mph, and possibly 30-35 mph along the immediate coast.

Monday night into Tuesday, the surface low will linger in the area but will slowly start to lift northeast. Rain chances should begin to decrease from south to north as drier air works into the area. Pops will range from 20% near the altamaha to 50-60% across the northern zones. Long term Tuesday night through Friday Mid level troughing will persist over the eastern u.S. Through late week. At the surface, an area of low pressure will slowly lift northeast up the coast Wednesday into Thursday. There are some discrepancies in the models thereafter, but it appears that a cold front could be approaching the forecast area closer to the weekend. Rain chances will remain fairly low through the period with no more than 20% in the forecast at this time. Temperatures will be near normal. Aviation 08z Saturday through Wednesday Although ksav has a small potential for a brief period of high-end MVFR ceilings today, both that terminal and kchs will beVFR through 06z Sunday. East winds will peak at least as high as 15-20 kt during the late morning and afternoon at both sites. Extended aviation outlook: flight restrictions in reduced ceilings and visibilities are expected Sunday night into at least Monday night. Gusty winds expected on Monday. Marine Today: strong high pressure centered in the NE quadrant of the nation will dominate and maintains about a 3 mb spread from north to south across the waters. This is enough to produce ne-e winds of 15-20 kt with frequent higher gusts on the south carolina waters, and closer to 20 or 25 kt on the georgia waters. The prolonged onshore fetch will allow for seas as high as 4 or 5 ft within 20 nm and up to 6 to 7 ft on the outer georgia waters through the day. For now we have just one small craft advisory on the waters 20-60 nm off the georgia coast. However, we still might need to hoist an advisory closer to shore and maybe even in charleston harbor. But since we feel that any combination of 6 foot seas and or 25 kt wind gusts will be limited in frequency and coverage, we have opted not to go with any advisory at this time elsewhere. Tonight: a modest gradient holds in place between high pressure to the north and low pressure forming near the arklatex. This pattern will maintain e-ne winds at similar speeds and seas to what they were today. So for now the only advisory is again on the outer georgia waters, although the others will be close. Sunday through Thursday: marine conditions will deteriorate Sunday as a low pressure system approaches the area. Small craft advisories will be needed for all waters beginning as early as Sunday evening. Elevated east southeast winds will persist through Monday, and there continues to be some indications that gusts could approach gale force Monday afternoon, mainly in the charleston county waters. Winds will vastly improve on Tuesday, however seas will take a bit longer to subside. Marine zones should be headline-free by Wednesday afternoon. No issues expected thereafter as the surface low lifts northeast away from the area. Rip currents: moderate to locally strong onshore winds and small swells will impact the beaches today, leading to a moderate risk of rip currents. The georgia beaches do have a chance of requiring a high risk, but only if winds are a little more than now in the forecast. Rip currents: a prolonged stretch of moderate to perhaps strong onshore winds and larger surf will lead to an enhanced risk of rip currents at the beaches early next week. Chs watches warnings advisories Ga... None. Sc... None. Marine... Small craft advisory until 2 pm edt Wednesday for amz374. Near term... short term... Ect long term... Ect aviation... marine...

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
FPKG1 - 8670870 - Fort Pulaski, GA	7 mi	43 min	E 15 G 20	62°F	65°F		1025.6 hPa (-0.0)
41033	37 mi	35 min	E 16 G 23	62°F	63°F		1025.1 hPa
SAXG1 - Sapelo Island Reserve, GA	45 mi	43 min	ENE 8.9	63°F			1024 hPa (-1.0)	51°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA	45 mi	53 min	ENE 18 G 19	65°F	64°F	5 ft	1023.3 hPa (-0.7)	54°F
ACXS1 - ACE Basin Reserve, SC	47 mi	58 min	N 1	53°F				48°F

Wind History for Fort Pulaski, GA

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NE13 G18

NE13 G18

NE17 G21

NE18 G24

NE13 G18

NE13 G18

NE14 G20

E15 G19

NE14 G20

E15 G19

E13 G18

E12 G16

E13 G16

E11 G14

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E10 G14

E12 G18

E15 G20

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1 day ago

W7

W7 G11

W7 G10

W11 G16

W6 G12

SW7 G11

W13 G19

W14 G18

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W16 G20

W13 G16

W6

NW17 G25

NW8

N12 G16

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NE13 G19

NE15 G19

NE17 G21

NE16 G20

2 days ago

SW4

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SW6 G9

W12

W9 G13

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SW9 G12

SW9 G12

S7 G13

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SW7 G11

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W6 G9

W8 G11

W6 G9

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Hunter U. S. Army Airfield, GA	6 mi	47 min	ENE 7	10.00 mi	Fair	59°F	42°F	53%	1024.7 hPa
Savannah-Hilton Head International Airport, GA	11 mi	50 min	NNE 5	10.00 mi	Partly Cloudy	50°F	46°F	89%	1025.6 hPa
Hilton Head Island, Hilton Head Airport, SC	22 mi	48 min	ENE 11 G 18	10.00 mi	Fair	61°F	42°F	52%	1026.1 hPa

Wind History from SVN (wind in knots)

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NE9

NE12 G17

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E10 G15

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NE7 G19

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NE7

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W13 G17

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W18 G24

W22 G26

W18 G29

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SW13 G17

SW13 G18

W15 G21

SW12 G19

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Tide / Current Tables for Thunderbolt, Wilmington River, Georgia

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Thunderbolt Click for Map Sat -- 12:57 AM EDT     Moonset Sat -- 01:15 AM EDT     9.01 feet High Tide Sat -- 06:48 AM EDT     Sunrise Sat -- 07:29 AM EDT     0.13 feet Low Tide Sat -- 11:36 AM EDT     Moonrise Sat -- 01:54 PM EDT     7.58 feet High Tide Sat -- 07:46 PM EDT     0.09 feet Low Tide Sat -- 07:57 PM EDT     Sunset Tide / Current data from XTide NOT FOR NAVIGATION

12am	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm
8.3	9	8.7	7.5	5.7	3.5	1.5	0.3	0.3	1.3	3	4.8	6.3	7.3	7.6	7	5.7	3.9	2	0.5	0.1	0.9	2.6	4.7

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Tide / Current Tables for Savannah River Entrance, Georgia Current

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Savannah River Entrance Click for Map Sat -- 12:56 AM EDT     Moonset Sat -- 02:12 AM EDT     -0.00 knots Slack Sat -- 05:09 AM EDT     -2.19 knots Max Ebb Sat -- 06:47 AM EDT     Sunrise Sat -- 08:28 AM EDT     0.00 knots Slack Sat -- 10:54 AM EDT     1.76 knots Max Flood Sat -- 11:35 AM EDT     Moonrise Sat -- 02:41 PM EDT     -0.00 knots Slack Sat -- 05:34 PM EDT     -1.89 knots Max Ebb Sat -- 07:56 PM EDT     Sunset Sat -- 08:38 PM EDT     0.00 knots Slack Sat -- 11:23 PM EDT     2.27 knots Max Flood Tide / Current data from XTide NOT FOR NAVIGATION

12am	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm
1.8	1.1	0.2	-0.9	-1.9	-2.2	-2.1	-1.6	-0.6	0.6	1.5	1.8	1.5	1.1	0.6	-0.3	-1.3	-1.8	-1.9	-1.6	-0.8	0.5	1.6	2.2

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Weather Map and Satellite Images

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GOES Local Image of Southeast    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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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Wind Forecast for Charleston, SC (5,6,7,8)

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Ground Weather Radar Station Charleston, SC

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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 numerious 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.