Monday, December9, 2019
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Marine Weather and Tides
Tybee Island, 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 7:11AMSunset 5:21PM Monday December 9, 2019 7:48 PM EST (00:48 UTC) Moonrise 3:48PMMoonset 4:30AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 725 Pm Est Mon Dec 9 2019
Rest of tonight..SW winds 10 to 15 kt. Seas 3 to 4 ft, building to 3 to 5 ft. Patchy fog, mainly after midnight, possibly dense w/ vsby 1/2 nm or less.
Tue..SW winds 10 kt. Seas 3 to 4 ft. Patchy dense fog.
Tue night..SW winds 10 kt. Seas 3 to 4 ft. Areas of dense fog. A chance of showers after midnight.
Wed..NW winds 10 to 15 kt, becoming N 15 to 20 kt with gusts to 25 kt in the afternoon. Seas 3 to 4 ft, building to 4 to 5 ft in the afternoon. Areas of fog in the morning. A chance of showers.
Wed night..NE winds 20 to 25 kt with gusts to 35 kt. Seas 4 to 6 ft, building to 5 to 7 ft after midnight. A chance of showers.
Thu..NE winds 25 to 30 kt. Seas 6 to 8 ft, building to 7 to 9 ft in the afternoon. A chance of showers.
Thu night..NE winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Seas 7 to 9 ft. A chance of showers.
Fri..NE winds 20 to 25 kt. Seas 5 to 7 ft. Showers likely.
Fri night..S winds 10 to 15 kt. Seas 4 to 5 ft. Showers likely.
Sat..SW winds 10 to 15 kt. Seas 4 to 5 ft. A chance of showers.
Sat night..W winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers.
AMZ300 725 Pm Est Mon Dec 9 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Ahead of approaching cold front, unseasonably warm conditions will prevail through Tuesday. The cold front will push through the area Tuesday night into early Wednesday, then strong high pressure will build over the area Wednesday through Thursday. Low pressure will then produce wet conditions late week into this weekend, followed by high pressure late weekend into early next week.


7 Day Forecast for Marine Location Near Tybee Island, GA
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location: 32.03, -80.85     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 100040 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 740 PM EST Mon Dec 9 2019

SYNOPSIS. Ahead of approaching cold front, unseasonably warm conditions will prevail through Tuesday. The cold front will push through the area Tuesday night into early Wednesday, then strong high pressure will build over the area Wednesday through Thursday. Low pressure will then produce wet conditions late week into this weekend, followed by high pressure late weekend into early next week.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. No major changes with the latest update. Unseasonably warm conditions on tap with lows not too much below where they are now, mainly near 60 most locales given the abundant cloud cover. This will be within a few degrees of the record high min temperature of 62 degrees in Downtown Charleston, although within about 5 degrees of the record high min temps at Charleston (65 deg)/Savannah (66 deg) Airports. Main concern is the threat for some fog overnight, either from lowering of low clouds, fog advecting into the area from the southwest, and/or advection of sea fog across the nearby Atlantic coastal waters as a warm and humid air mass continues to remain in place. Any fog could become dense with visibility less than a quarter of a mile so the morning commute could be hampered in some places.

SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/. Tuesday: Away from the immediate coast/ahead of an approaching cold front, record/near-record warmth featuring high temperatures in the upper 70s/lower 80s will prevail. On the immediate coast, expect the marine influence to produce much cooler temperatures, and seas fog will either hug the coastline or will lurk not far offshore. This regime will persist Tuesday night, while the chance for showers will ramp up as the cold front near the region. Overall, per latest guidance the band of deep moisture along/behind the surface front appears to be thinning with time, so overnight PoPs are capped at 40-50 percent.

Wednesday, the cold front will push offshore early, and high pressure will push much cooler air into the region. High temperatures in the upper 50s to middle 60s should occur by around midday then should generally level off or even fall a couple of degrees through mid-afternoon. Meanwhile, scattered showers could persist during the morning, then somewhat drier air should spread into the region during the afternoon/at night. While showers could end, guidance depicts sufficient residual moisture to justify low PoPs through Wednesday night. Wednesday night lows will be more typical of mid-December, ranging from the upper 30s/lower 40s inland to 45-50F due to elevated northeast winds on the immediate coast.

Thursday, strong high pressure centered north/northeast of the region will anchor a cool wedge regime with high temperatures only in the lower to middle 50s most locations, and elevated northeast winds will create apparent temperatures as low as the 40s inland. The prospects for measurable precipitation remain uncertain, as the high could be sufficiently strong to hold deep moisture well south of the region through the day, but per uncertainty and area consensus, maintained ongoing slight chance/chance PoPs. More likely, deeper moisture and an associated potential for widespread rainfall could commence Thursday night or Friday.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/. Models have started to come into better agreement for the late week period. The pattern continues to favor cooler and unsettled conditions. A wedge of high pressure will linger inland Thursday night into Friday, while a coastal trough/warm front develops offshore. Meanwhile, low pressure will organize over the Gulf of Mexico. The low is expected to lift northeast over or near the area sometime late week. While there are still some timing issues, plenty of moisture and forcing will support higher than normal rain chances, with the potential for periods of moderate to heavy rainfall. Late weekend once the low passes through, drier conditions and temperatures closer to normal are expected.

AVIATION /00Z TUESDAY THROUGH SATURDAY/. Low to moderate confidence 00Z/10 forecast due to the risk for stratus and/or fog overnight, possibly lingering later in the morning. Given the latest model consensus we backed off from the previous forecast of IFR conditions given the lower confidence. After daybreak any fog/stratus will dissipate and dry conditions are expected the rest of the period with a healthy southwest breeze.

Extended Aviation Outlook: Periods of flight restrictions are expected, especially in fog/stratus Tuesday night into Wednesday and in showers late week into this weekend.

MARINE. Tonight: Southerly flow will prevail with wind speeds as high as 10-15 knots. Seas should stay in the 3-5 ft range through the night. The main forecast challenge will be the potential for sea fog development. The southerly flow will bring a warm moist air mass across the relatively cooler shelf waters. Model guidance favors sea fog development overnight, though given it appears to be currently overdone, confidence is low on initiation. If any fog does develop it certainly could become dense.

Tuesday and Tuesday night, the primary concern will focus on the potential for significant sea fog. Otherwise, pre-cold front S/SW winds less than 20 knots will be accompanied by seas 3-5 feet before a cold front crosses the waters Wednesday morning.

Wednesday through Friday: After cold fropa and an initial wind shift to the northwest Wednesday morning, strong high pressure will expand over the region and will shift to a position north/northeast of the waters through the latter half of the week. As a result, winds will turn to the northeast and strengthen, and seas will build to hazardous levels. Then, low pressure will track north/northeast from the Gulf of Mexico late this week into this weekend, and this should maintain elevated winds/seas. While Small Craft Advisory conditions are a virtual certainty during this period, a period of gales could develop Wednesday night through Thursday. We will continue to highlight this threat within the Hazardous Weather Outlook, and Gale Watches/Warnings could eventually be required.

Sea Fog: Unseasonably warm/humid air flowing over cool Atlantic shelf waters will likely produce sea fog until a cold front pushes through the region early Wednesday. The scenario appears very favorable for significant marine fog, although details including coverage/persistence of dense fog remain uncertain. However, it's likely that Dense Fog Advisories will be required.

TIDES/COASTAL FLOODING. Elevated tide cycles are expected late week due to increasing astronomical influences with the full moon on Thursday and strong northeasterly winds. Minor to moderate coastal flooding will be possible with the morning high tides Thursday through Saturday. Coastal Flood Advisories could be required. Also of note, if significant rainfall occurs around the morning high tides Friday and Saturday, the potential for flooding of poor drainage areas could increase along the coast.

CLIMATE. Record Max Temps December 10th . KCHS . 82F set in 1972. KCXM . 79F set in 1943. KSAV . 82F set in 1972.

EQUIPMENT. KCLX will remain down until further notice.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . None.

NEAR TERM . RJB SHORT TERM . SPR LONG TERM . ETM AVIATION . RJB/SPR MARINE . RJB/SPR TIDES/COASTAL FLOODING . CLIMATE . EQUIPMENT .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 3 mi187 min SSW 6 G 8.9 65°F 58°F1017.1 hPa
41033 29 mi41 min SSW 5.8 G 9.7 60°F 58°F1018.9 hPa
ACXS1 - ACE Basin Reserve, SC 42 mi64 min SSE 1 62°F 1018 hPa60°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi59 min S 7.8 G 9.7 66°F 63°F3 ft1018 hPa (+1.0)64°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilton Head Island, Hilton Head Airport, SC15 mi59 minS 710.00 miPartly Cloudy64°F60°F88%1018.3 hPa
Hunter U. S. Army Airfield, GA16 mi53 minS 610.00 miFair65°F60°F84%1017.2 hPa
Savannah-Hilton Head International Airport, GA20 mi56 minS 810.00 miMostly Cloudy66°F62°F87%1017.8 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)
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Last 24hrNE5NE5NE4N3NE6365
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NE565NE4NE6NE5NE3Calm3CalmS6S7S7S7S7S7
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2 days agoN6N5N6CalmCalmCalmCalmN4CalmN4N5N6N8N6N6N8N11E6
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NE8NE6NE6

Tide / Current Tables for Tybee Light, Savannah River, Georgia
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Tybee Light
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Mon -- 04:30 AM EST     Moonset
Mon -- 05:28 AM EST     7.16 feet High Tide
Mon -- 07:12 AM EST     Sunrise
Mon -- 11:52 AM EST     0.74 feet Low Tide
Mon -- 03:47 PM EST     Moonrise
Mon -- 05:19 PM EST     Sunset
Mon -- 05:53 PM EST     6.49 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.61.73.34.96.37.17.16.35.13.62.21.10.71.32.53.95.26.26.564.93.51.90.7

Tide / Current Tables for Savannah River Entrance, Georgia Current (2) (expired 1999-12-31)
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Savannah River Entrance
Click for Map
Mon -- 01:08 AM EST     0.00 knots Slack
Mon -- 03:28 AM EST     1.47 knots Max Flood
Mon -- 04:30 AM EST     Moonset
Mon -- 06:43 AM EST     -0.00 knots Slack
Mon -- 07:12 AM EST     Sunrise
Mon -- 10:19 AM EST     -2.38 knots Max Ebb
Mon -- 01:49 PM EST     0.00 knots Slack
Mon -- 03:47 PM EST     Moonrise
Mon -- 03:53 PM EST     1.19 knots Max Flood
Mon -- 05:19 PM EST     Sunset
Mon -- 06:45 PM EST     -0.00 knots Slack
Mon -- 10:31 PM EST     -2.30 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.1-0.10.81.41.410.5-0.2-1-1.9-2.4-2.3-1.7-0.80.20.91.20.90.4-0.1-0.9-1.7-2.2-2.2

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 (19,4,5,8)
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Ground Weather Radar Station Charleston, SC
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