Friday, December13, 2019
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Marine Weather and Tides
Garden City, GA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:14AMSunset 5:22PM Friday December 13, 2019 9:38 PM EST (02:38 UTC) Moonrise 6:54PMMoonset 8:33AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 810 Pm Est Fri Dec 13 2019
Tonight..NE winds 5 to 10 kt, becoming E after midnight, then becoming sw 10 kt late. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. Patchy fog this evening. A slight chance of tstms. A chance of showers this evening, then showers after midnight.
Sat..W winds 15 to 20 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon. A chance of showers with a slight chance of tstms in the morning.
Sat night..W winds 15 to 20 kt, becoming nw 10 to 15 kt after midnight. Seas 3 to 4 ft, subsiding to 2 to 3 ft after midnight.
Sun..NW winds 5 to 10 kt, becoming sw in the afternoon. Seas 2 ft.
Sun night..S winds 5 kt. Seas 2 ft.
Mon..S winds 5 to 10 kt. Seas 2 ft.
Mon night..S winds 10 to 15 kt. Seas 2 to 3 ft, building to 3 to 4 ft after midnight. A slight chance of showers.
Tue..SW winds 10 kt. Seas 3 to 4 ft. Showers likely with a slight chance of tstms.
Tue night..NW winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers.
Wed..N winds 15 to 20 kt. Seas 3 to 4 ft.
Wed night..N winds 15 kt. Seas 3 to 4 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 810 Pm Est Fri Dec 13 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. An area of low pressure will track across the area tonight. High pressure should then build over the region Saturday and persist into early next week. A cold front will shift across the area Tuesday, followed by high pressure into late next week.


7 Day Forecast for Marine Location Near Garden City, GA
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location: 32.07, -81.11     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 140006 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 706 PM EST Fri Dec 13 2019

SYNOPSIS. An area of low pressure will track across the area tonight. High pressure should then build over the region Saturday and persist into early next week. A cold front will shift across the area Tuesday, followed by high pressure into late next week.

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/. Made a few mostly minor adjustments with the latest forecast update, mainly to account for rain/temp trends. As of early evening radar indicates only some light rain near and east of I-95 but we expect another round of showers, and possibly a few thunderstorms, to sweep through in association with a strong upper shortwave and the surface cold front. The best chance for any marginal surface- based instability looks to be close to the coast, especially in GA, so we cannot completely rule out an isolated tornado given sufficient low-level helicity. Also, can't rule out some fog, possibly dense, as plenty of moisture remains beneath the low-level inversion and winds drop off due to a lull in the pressure gradient as a surface trough lingers behind the initial weak area of low pressure.

Temperatures should be about steady or even rise a bit overnight (especially near the coast) as the inland high pressure wedge weakens and winds turn more southerly ahead of the approaching cold front. Lows should range from the mid to upper 40s inland to the lower to mid 50s closer to the coast.

SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/. Mid-level troughing over the Southeast U.S. Saturday morning will shift over the Northeast U.S. by Saturday night, causing semi-zonal flow over our area. This flow will continue on Sunday. Sunday night into Monday broad high pressure will be building over the Bahamas while troughing amplifies over the Central U.S., leading to southwest flow over our area. At the surface, low pressure and it's attached from will be moving away from our area Saturday morning while high pressure moves in from the west. The high is forecasted to prevail over the Southeast U.S. late Saturday into Sunday, then shift offshore Sunday night. As the high continues to move further offshore on Monday, a front will approach from the distant west. Though, it's not expected to reach our area in the short term. The only precipitation we are expecting in the short term is early Saturday morning, as the aforementioned low/front moves away. Some remnant showers, especially along the coast, should bring little, if any, measurable QPF. Then, the high will become the dominant driver of the forecast for the rest of the short term. Subsidence and dry air associated with the high will bring our area dry conditions into Monday. High temperatures should generally be in the 60s Saturday and Sunday. Highs rise well into the 70s on Monday as winds turn to the south/southwest, ushering warmer air into the region.

Lake Winds . Gusty west winds behind the cold front Saturday afternoon on Lake Moultrie could exceed Lake Wind Advisory thresholds of 25 knots, possibly lingering into early evening.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. The area will become warm-sectored Monday night into Tuesday ahead of a cold front expected to shift across the region Tuesday afternoon afternoon/evening. Temps will be the warmest of the week on Tuesday, peaking in the mid 70s across several areas. Sfc heating should also be sufficient to produce some instability along/near fropa, suggesting a few thunderstorms embedded in numerous showers until the front reaches the coast. Dry and cooler high pressure will then build across the area Tuesday night through late week. Temps will be some 15-20 degrees cooler following the front with highs generally peaking in the mid/upper 50s and overnight lows in the low/mid 30s away from the coast. A few showers could return next weekend as a coastal trough takes form along the Southeast Coast.

AVIATION /23Z FRIDAY THROUGH WEDNESDAY/. 00Z/13 KCHS/KSAV TAFs: LIFR should prevail overnight with continued low clouds and some heavier rain associated with a cold front. Conditions should improve to VFR by 18Z but wind gusts will reach 20-25 kt during the afternoon.

Extended Aviation Outlook: VFR through Monday. Flight restrictions are possible at both terminals Tuesday due to showers/thunderstorms along a passing cold front.

MARINE. Tonight: Mostly variable winds should eventually become southerly later tonight, picking up significantly toward daybreak. 6+ foot seas will be near the Gulf Stream and we have Small Craft Advisories for the Charleston County nearshore waters and offshore GA waters.

Saturday through Wednesday: An area of low pressure and its associated front will be moving away from the coastal waters Saturday morning while high pressure approaches from the west. The interaction between these two features will lead to elevated winds for most of Saturday. The worst conditions appear to be Saturday late afternoon. Small Craft Advisories will be ongoing for most of the waters, except AMZ354 and Charleston Harbor where wind gusts should remain just below 25 kt. The winds are expected to ease late Saturday evening through the overnight hours as the high becomes more dominant across our area. All of the advisories should expire across the waters by daybreak Sunday. The high is forecasted to persist into early next week. A cold front will shift across all coastal waters Tuesday, producing another round of cold air advection across the region and the potential for Small Craft Advisories Tuesday night into early Wednesday.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from 10 AM to 9 PM EST Saturday for AMZ352. Small Craft Advisory until 5 AM EST Sunday for AMZ374. Small Craft Advisory until midnight EST Saturday night for AMZ350.

NEAR TERM . RJB SHORT TERM . MS LONG TERM . DPB AVIATION . MS/RJB MARINE . MS/RJB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 11 mi57 min NW 7 G 8 49°F 56°F1010.2 hPa
41033 40 mi91 min NNW 7.8 G 12 51°F 57°F1010.4 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 48 mi49 min NNW 5.8 G 7.8 57°F 61°F5 ft1009.6 hPa (-1.5)57°F
ACXS1 - ACE Basin Reserve, SC 48 mi114 min NNW 1 48°F 1010 hPa48°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, GA3 mi1.7 hrsNW 610.00 miOvercast49°F46°F92%1010.1 hPa
Savannah-Hilton Head International Airport, GA7 mi46 minNW 52.00 miFog/Mist49°F48°F97%1010.2 hPa
Hilton Head Island, Hilton Head Airport, SC24 mi44 minVar 42.00 miFog/Mist48°F48°F100%1010.2 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrNE8NE11--NE7NE7NE9NE7NE7N6NE8N4N7N8N7NE4N5NW5N4CalmNW4NW7NW4NW6NW5
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Tide / Current Tables for Savannah (Bull Street), Georgia
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Savannah (Bull Street)
Click for Map
Fri -- 03:14 AM EST     -0.44 feet Low Tide
Fri -- 07:16 AM EST     Sunrise
Fri -- 08:32 AM EST     Moonset
Fri -- 08:54 AM EST     9.09 feet High Tide
Fri -- 03:53 PM EST     -0.04 feet Low Tide
Fri -- 05:20 PM EST     Sunset
Fri -- 06:53 PM EST     Moonrise
Fri -- 09:16 PM EST     7.64 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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42.10.5-0.401.94.678.69.18.67.55.83.81.90.5-00.92.95.26.97.67.46.7

Tide / Current Tables for Savannah River Entrance, Georgia Current (2) (expired 1999-12-31)
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Savannah River Entrance
Click for Map
Fri -- 12:42 AM EST     -2.47 knots Max Ebb
Fri -- 03:53 AM EST     0.00 knots Slack
Fri -- 06:27 AM EST     2.01 knots Max Flood
Fri -- 07:15 AM EST     Sunrise
Fri -- 08:31 AM EST     Moonset
Fri -- 09:25 AM EST     -0.00 knots Slack
Fri -- 01:13 PM EST     -2.85 knots Max Ebb
Fri -- 04:42 PM EST     0.00 knots Slack
Fri -- 05:19 PM EST     Sunset
Fri -- 06:52 PM EST     Moonrise
Fri -- 06:57 PM EST     1.61 knots Max Flood
Fri -- 09:39 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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-2.3-2.4-1.9-10.11.21.91.91.30.4-0.5-1.5-2.4-2.8-2.6-1.9-0.80.31.31.61.20.5-0.3-1.1

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (21,6,7,8)
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Ground Weather Radar Station Charleston, SC
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