Saturday, February22, 2020
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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 6:57AMSunset 6:16PM Saturday February 22, 2020 2:35 AM EST (07:35 UTC) Moonrise 6:40AMMoonset 5:30PM Illumination 2% Phase: Waning Crescent; Moon at 28 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- 1233 Am Est Sat Feb 22 2020
.small craft advisory in effect through this afternoon...
Tonight..NE winds 20 kt with gusts to 25 kt. Seas 4 to 6 ft.
Sat..NE winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 4 to 6 ft, subsiding to 3 to 4 ft in the afternoon.
Sat night..NE winds 5 to 10 kt. Seas 3 to 4 ft.
Sun..NE winds 5 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the afternoon.
Sun night..E winds 5 kt. Seas 2 to 3 ft.
Mon..SE winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 to 3 ft. A chance of showers.
Mon night..S winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Showers likely.
Tue..SW winds 15 to 20 kt. Seas 4 to 5 ft. Showers likely.
Tue night..SW winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely.
Wed..SW winds 15 to 20 kt. Seas 3 to 4 ft. A chance of showers.
Wed night..W winds 15 to 20 kt. Seas 3 to 4 ft.
AMZ300 1233 Am Est Sat Feb 22 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will persist across the area this weekend. A warm front will move through the area and lift north of the region early next week. A pair of cold fronts will bring unsettled weather during the middle of next week before high pressure returns late 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 220539 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1239 AM EST Sat Feb 22 2020

SYNOPSIS. High pressure will persist across the area this weekend. A warm front will move through the area and lift north of the region early next week. A pair of cold fronts will bring unsettled weather during the middle of next week before high pressure returns late next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/. Forecast remains on track overnight with clear skies, lingering northeast breezes right along the coast and cold sub-freezing temps for most of the area.

SHORT TERM /6 AM THIS MORNING THROUGH MONDAY/. Cold, dry high pressure will prevail through Sunday night. Temperatures will remain below normal, with freezing temperatures in store for Saturday night due to strong radiational cooling. On Sunday, the high pressure will shift offshore, giving way for a low pressure system to move into the area, associated with a warm front. Temperatures will start to hedge closer to normal, with highs in the low to mid 60s throughout. The warm front will move into the area Monday, bringing another wet pattern. As it lifts north, light rain is expected throughout the CWA into Monday night, with about a tenth of inch expected.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. A highly amplified pattern develops aloft as a strong closed low carves out a deep trough across the central states Tuesday, before it lifts through the MidWest Wednesday, the Northeast states Thursday and into southeast Canada Friday. Simultaneously at the surface, low pressure shifts through the Ohio Valley and eastern Great Lakes early in the period, before an even stronger and larger encompassing low forms over the Northeast during the mid and late week. Cold fronts that are associated with each of these low pressure systems will impact the local area during mid week. Considerable deep layered moisture and large scale forcing will generate a wet and unsettled period Monday night into Tuesday night or Wednesday.

High pressure steadily builds in for late in the week, bringing with it not only a return of dry conditions, but also another bout of colder weather. Temps will again be far below climo, with breezy to windy weather the second part of next week, which will make it feel even colder. A Lake Wind Advisory could be required on Lake Moultrie for at least late Wednesday and Thursday.

AVIATION /06Z SATURDAY THROUGH WEDNESDAY/. VFR at KSAV/KCHS through 06Z Sunday.

Extended Aviation Outlook: VFR weather through Sunday or Sunday night. Flight restrictions are possible Monday, but more likely Monday night and Tuesday with the next round of wet weather.

MARINE. Overnight: Small Craft Advisories remain in force for all waters except Charleston Harbor. Otherwise, winds have decreased a bit with slowly subsiding seas, but still within criteria for SCAs.

Saturday through Monday: As the pressure gradient continues to relax, Small Craft Advisories will start coming down around 18Z Saturday for the nearshore waters. The winds will decrease first, with seas being the primary reason for the continuation into the early afternoon. Small Craft Advisory will remain across the outer Georgia waters until Sunday morning. The seas will also be the primary reason for it to continue through Sunday morning with winds gradually decreasing through the weekend.

Tuesday through Thursday: As the high continues to pull further offshore early next week in advance of a pair of cold fronts, we will experience a gradual rise in winds and seas. Small Craft Advisories will likely be necessary at a later time.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 1 PM EST this afternoon for AMZ350- 352-354. Small Craft Advisory until 8 AM EST Sunday for AMZ374.

NEAR TERM . SHORT TERM . LONG TERM . AVIATION . MARINE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi53 min NE 15 G 19 38°F 54°F1030.9 hPa
41033 37 mi87 min ENE 18 G 25 39°F 55°F1031.6 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi45 min NE 19 G 25 45°F 57°F6 ft1028.7 hPa (-1.6)37°F
SAXG1 - Sapelo Island Reserve, GA 45 mi95 min NNE 8 38°F 1030 hPa (-1.0)29°F
ACXS1 - ACE Basin Reserve, SC 47 mi110 min N 1 32°F 1032 hPa25°F

Wind History for Fort Pulaski, GA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA6 mi39 minN 010.00 miFair34°F22°F62%1030.5 hPa
Savannah-Hilton Head International Airport, GA11 mi42 minNNE 710.00 miFair34°F23°F64%1031.5 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi40 minN 1110.00 miFair36°F23°F60%1031.2 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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--N7N6CalmN4NE6N5NE3NE4Calm
1 day agoN4NE6NE5NE7--NE6NE6NE7NE7
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2 days agoCalmCalmCalmN4CalmCalm2SE5CalmW3N6N10N8NE6N6NE7E10
G18
E9NE9NE8NE6NE6NE6NE3

Tide / Current Tables for Thunderbolt, Wilmington River, Georgia
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Thunderbolt
Click for Map
Sat -- 01:18 AM EST     -0.29 feet Low Tide
Sat -- 06:39 AM EST     Moonrise
Sat -- 06:59 AM EST     Sunrise
Sat -- 07:55 AM EST     8.22 feet High Tide
Sat -- 01:53 PM EST     -0.20 feet Low Tide
Sat -- 05:29 PM EST     Moonset
Sat -- 06:15 PM EST     Sunset
Sat -- 08:01 PM EST     7.53 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.8-0.2-01.12.94.96.77.98.27.76.34.32.10.4-0.20.523.95.77.17.57.15.84

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 02:06 AM EST     0.01 knots Slack
Sat -- 05:10 AM EST     1.94 knots Max Flood
Sat -- 06:39 AM EST     Moonrise
Sat -- 06:59 AM EST     Sunrise
Sat -- 08:41 AM EST     -0.00 knots Slack
Sat -- 12:09 PM EST     -2.29 knots Max Ebb
Sat -- 02:42 PM EST     0.00 knots Slack
Sat -- 05:18 PM EST     1.78 knots Max Flood
Sat -- 05:29 PM EST     Moonset
Sat -- 06:15 PM EST     Sunset
Sat -- 08:48 PM EST     -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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-1.9-1.3-0.111.71.91.91.60.7-0.3-1.2-1.9-2.3-2-0.90.41.41.81.71.40.8-0.2-1-1.5

Weather Map
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wmap_A
GEOS 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
Wind Forecast for Charleston, SC (2,6,7,8)
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Ground Weather Radar Station Charleston, SC
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weather_mapweather_map weather_map

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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.