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Marine Weather and Tides Thunderbolt, GA Version 3.4

What's New / NOTES 10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome. 10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

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Sunrise 7:22AM

Sunset 5:45PM

Thursday January 17, 2019 4:17 AM EST (09:17 UTC)

Moonrise 2:28PM

Moonset 3:34AM

Illumination 86%

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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7 Day Forecast for Marine Location Near Thunderbolt, GA

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Area Discussion for - Charleston, SC

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Fxus62 kchs 170903 afdchs area forecast discussion national weather service charleston sc 403 am est Thu jan 17 2019 Synopsis Dry high pressure will prevail today with a weak upper disturbance moving through tonight. A stronger storm system will then impact the area Saturday night and Sunday. Much colder temperatures will return early next week followed by increasing temperatures and rain chances into the middle of next week. Near term through tonight As of 4 am: a slight surge in high pressure is expected to push over the charleston tri-county region around daybreak this morning. As a result, surface winds are expected to shift out of the north, possibly resulting in an increase in moisture convergence. I will include a mention of patchy fog across portions of dorchester, berkeley, and charleston counties. The fog should dissipate within an hour following sunrise. As the center of low pressure tracks over the ohio river valley, llvl winds are forecast to shift from the south-southwest. The combination of return flow and at least partly sunny conditions should allow temperatures to peak in the low to mid 60s. Tonight: the center of low pressure will continue to track to the ne across the mid-atlantic states. The associated cold front is forecast to sweep across the southern appalachians between 9z to 12z. Within the mid-levels, a weak short wave will ripple across the forecast area this evening, well ahead of the sfc cold front. High resolution cam guidance indicates only a few showers will be possible tonight, supporting only schc pops across the sc lowcountry. Given thick clouds and continued SW winds, low temperatures should verify in the mid 40s. Short term Friday through Sunday Generally high confidence this period. Surface high pressure will maintain mainly dry conditions Friday although a few showers cannot be completely ruled out toward the csra where moisture and instability will be increasing a bit. A warm front is expected to develop over or near the area Friday night ahead of low pressure near texarkana and this could lead to a few showers into Saturday, mainly well inland, but it looks like the bulk of the rain will hold off until Saturday night with clearing on Sunday. Still appears instability will remain low as thus the risk for thunderstorms as well. Rain amounts still look to average around a half inch with some locally higher amounts. Temperatures will be well above normal through Saturday (when it could get near record highs especially at ksav), then return back to near normal Sunday (although highs are more likely to occur earlier in the day due to the cold advection kicking in during the day behind the front). It will also become breezy Saturday afternoon and continue through Sunday with a lake wind advisory possible for lake moultrie starting Sunday. Long term Sunday night through Wednesday High forecast confidence through Monday night before confidence lowers into mid week. High pressure will be building from the northwest behind an upper trough pushing offshore to start the period. The high should be centered near nc va by Tuesday with a coastal trough developing off the southeast u.S. Coast. Thereafter the forecast becomes more uncertain as some model guidance is more progressive with the high shifting offshore than others, but for now we trended toward the slower ECMWF solution which matches better with the GFS ensemble mean. So we are indicating small rain chances returning Tuesday night and increasing Wednesday before diminishing behind a cold front into Thursday. Most, if not all, locales should be below freezing Monday morning with inland areas in the mid to upper 20s and wind chills near 20

degrees. It's not out of the question that coastal areas reach wind chill advisory levels of 15 degrees, especially near charleston where the colder temperatures are expected. Highs Monday should only range from around 40 near the santee river to 50 near the altamaha river. Temperatures Monday night look a bit milder especially near the coast due to more onshore winds but interior areas could reach similar temperatures as Monday morning. Thereafter temperatures will moderate into mid week to near or above normal levels before possibly returning back below normal again Thursday behind the cold front. Aviation 09z Thursday through Monday Near term guidance indicates that sfc high pressure will surge southward across kchs around dawn this morning. Moisture convergence is expected to increase and will support a period of patchy fog. I will include a tempo between 10z to 13z for fg. Ksav should remainVFR. During the daylight hours, south winds will develop within the warm sector of low pressure tracking across the ohio river valley. Winds across the terminals will become light to calm during the evening hours. Extended aviation outlook: restrictions possible as early as Friday but more likely Saturday night into early Sunday, probably ifr or worse at times due to low clouds and moderate rain. Also, breezy gusty conditions are expected later Saturday into early Monday. Marine Today and tonight: broad high pressure will remain centered over fl as a cold front crosses the southern appalachians late tonight. Winds are forecast to range between 5 to 10 kts south during the daylight hours. Winds should shift from the west and increase to 10- 15 kts. Seas are forecast to remain around 1 ft across the near shore waters and 2 ft beyond 20 nm. Tonight, seas will generally remain unchanged, possibly occasional 3 ft waves across the outer ga waters. Friday through Tuesday: no concerns through Saturday (although there is a low risk of sea fog developing Saturday Saturday night over the nearshore waters), but conditions will be deteriorating significantly Saturday night and Sunday as a strong cold front affects the area with some heavy showers and possible thunderstorms (mainly near the gulf stream). Wind could even gust near gale force across the ga waters beyond 20 nm Saturday night into early Sunday night. Otherwise, small craft advisories are expected for the entire area. Should see improving conditions Monday as winds turn offshore and diminish with the weakening cold air advection. Tides coastal flooding Tides coastal flooding... Astronomical tide levels will be high early next week and strong north northeast winds will help contribute to even higher levels which could lead to minor saltwater flooding around high tide, especially starting Monday. Thus, coastal flood advisories will be possible. Chs watches warnings advisories Ga... None. Sc... None. Marine... None. Near term... Ned short term... Rjb long term... Rjb aviation... Ned rjb marine... Ned rjb tides coastal flooding... Rjb

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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	36 min	NW 2.9 G 4.1	47°F	55°F		1024.7 hPa
41033	37 mi	70 min	ENE 1.9 G 3.9	53°F			1023.4 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA	45 mi	28 min	NNW 5.8 G 7.8	55°F	57°F	2 ft	1024.2 hPa (-0.4)	40°F
SAXG1 - Sapelo Island Reserve, GA	45 mi	78 min	N 1	37°F			1024 hPa (-1.0)	37°F
ACXS1 - ACE Basin Reserve, SC	47 mi	93 min	Calm	37°F			1025 hPa	37°F

Wind History for Fort Pulaski, GA

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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	82 min	N 0	10.00 mi	Fair	37°F	32°F	85%	1023.7 hPa
Savannah-Hilton Head International Airport, GA	11 mi	25 min	N 0	10.00 mi	Fair	36°F	34°F	93%	1024.6 hPa
Hilton Head Island, Hilton Head Airport, SC	22 mi	23 min	N 0	10.00 mi	Fair	37°F	35°F	93%	1024.7 hPa

Wind History from SVN (wind in knots)

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Tide / Current Tables for Thunderbolt, Wilmington River, Georgia

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Tide / Current Tables for Savannah River Entrance, Georgia Current

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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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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Wind Forecast for Charleston, SC (4,6,7,8)

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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.