Monday, December16, 2019
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Marine Weather and Tides
Savannah, 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 7:16AMSunset 5:23PM Monday December 16, 2019 5:54 AM EST (10:54 UTC) Moonrise 10:07PMMoonset 11:09AM Illumination 78% Phase: Waning Gibbous; Moon at 19 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- 346 Am Est Mon Dec 16 2019
Today..S winds 5 to 10 kt. Seas 2 to 3 ft.
Tonight..S winds 5 to 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 to 3 ft, building to 3 to 4 ft after midnight. Patchy fog after midnight.
Tue..SW winds 10 to 15 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the afternoon. Patchy fog in the morning. A chance of showers in the afternoon.
Tue night..W winds 10 to 15 kt, becoming nw 15 to 20 kt with gusts to 25 kt after midnight. Seas 2 to 3 ft. Showers likely with a slight chance of tstms in the evening, then showers likely after midnight.
Wed..N winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft.
Wed night..N winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft.
Thu..NE winds 10 to 15 kt. Seas 2 to 3 ft.
Thu night..NE winds 10 to 15 kt. Seas 3 to 4 ft.
Fri..NE winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers.
Fri night..NE winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 346 Am Est Mon Dec 16 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will slide offshore through tonight. A cold front will then cross the area late Tuesday, followed by high pressure prevailing into late week. Low pressure should develop near the coast this weekend, before high pressure returns early next week.


7 Day Forecast for Marine Location Near Savannah, GA
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location: 32, -81.15     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 161007 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 507 AM EST Mon Dec 16 2019

SYNOPSIS. High pressure will slide offshore through tonight. A cold front will then cross the area late Tuesday, followed by high pressure prevailing into late week. Low pressure should develop near the coast this weekend, before high pressure returns early next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Pre-dawn: Clear skies may give way to a veil of rather thin stratus along and west of I-95 by sunrise with some reduced vsbys. We could have some locally dense fog across inland GA into the upper SC Savannah River zones. Temps will range from some upper 30s northwest to mid to upper 40s close in the beaches and barrier islands.

Today: Broad upper ridging and NVA coupled with a dry deep layered atmosphere will result in dry weather. The surface high and low level ridge now offshore, will maintain a weak return flow regime in the lower levels across the region. After morning low clouds dissolve, we expect sunshine to prevail with some coastal stratocumulus expected today and few high clouds coming in late. The trend toward warmer weather continues today with highs many areas in the mid 70s.

Tonight: High pressure will weaken as a cold front is forecast to move into the mountains prior to daybreak on Tuesday. Is will be a warmer night with elevated surface dew points and an increase in high cloud coverage and occasional stratocumulus in warm air advection. The mid levels look to remain dry through 6 AM and we maintained dry weather until then. The pattern suggests fog may be an issue, however the latest runs of models are not robust for most areas but we could see some fog along coastal zones where stratus could advect off the cool stable Atlantic waters north of the Savannah River.

SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY/. Tuesday: The area will be warm-sectored for much of the day ahead of a cold front that eventually shifts through the area mid/late afternoon into the evening. Despite widespread clouds, southerly flow will help temps approach the mid/upper 70s across much of the area before fropa occurs. Light to moderate showers should ramp up fairly quick during afternoon hours when PWATS approach 1.50 to 1.75 inches along/ahead of the front. Given a positively tilted trough resulting in a slightly later arrival time of the front, SBCAPE should reach 500-1000 J/kg during peak diurnal heating. This should support a few thunderstorms embedded in a swath of showers shifting toward the coast by early evening, a few of which could produce gusty winds given 40-50 kt low-lvl wind fields passing across the area under the right-rear quadrant of an impressive 250mb jet centered north of the region. Expect the bulk of precip activity to shift offshore during evening into early overnight hours, especially as winds turn west/northwest post fropa and high pressure builds across inland areas late. However, some showers could linger near the coast until around midnight. Overnight lows will be considerably cooler than the previous night post fropa, dipping into the low/mid 40s away from the beaches.

Wednesday and Thursday: Dry high pressure will spread across the region from the northwest, then north with temps some 15-20 degrees cooler than earlier in the week. Despite a full sun each day, northerly winds will maintain high temps only in the low/mid 50s. Overnight lows will also be chilly, dipping into the low/mid 30s away from the coast under clear skies Wednesday night.

LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/. Dry high pressure will persist across the Southeast United States Thursday night into Friday, before a coastal trough/low develops off the Southeast Coast this weekend. Light north/northeast winds will likely support another chilly night of temps Thursday night with lows generally in the low/mid 30s. On Friday, temps should peak in the mid/upper 50s while a few areas south of I-16 in Southeast Georgia peak around 60 degrees. By Friday night, the potential for precip increases across the area as the coastal trough/low becomes more defined along the coast. Greatest chances of precip should occur Saturday as a large shortwave trough shifts across the region and helps strengthen the sfc trough along the coast. Chances of showers could linger through Sunday until the coastal trough/low lifts north/northeast and away from the region. Temps should be slightly warmer during the transition, then even warmer as dry high pressure spreads across the area early next week. In general, highs should peak in the upper 50s/lower 60s Saturday and Sunday, then low/mid 60s Monday. Overnight lows should range in the low/mid 40s.

AVIATION /09Z MONDAY THROUGH FRIDAY/. MVFR cigs around the terminals at 09Z. The model consensus and climatology supports a better potential of KSAV than at KCHS. On the 06Z TAFs, we introduced IFR vsbys around daybreak at KSAV but did not opt for any low cigs at this time. We maintained MVFR vsby at KCHS around daybreak.

Extended Aviation Outlook: Flight restrictions are likely at both CHS and SAV terminals Tuesday afternoon into Tuesday night due to showers/thunderstorms along a passing cold front. VFR conditions should then prevail at both terminals Wednesday and persist into Friday.

MARINE. A light pressure gradient and poor low level mixing profiles over the waters today should result in light winds from a generally southerly component. Seas near shore will be around 2 ft with close to 3 ft beyond 20 NM. Tonight, SW flow will slowly increase to 10-15 kt near shore and 15-20 kt over warmer offshore waters closer to the Gulf Stream. Building warmth and moisture atop the cool/stable marine layer could result in some stratus and fog, however increasing wind fields in the boundary layer suggest that sea fog should not be a widespread problem ahead of the approaching cold front.

Tuesday through Saturday: High pressure will gradually weaken across coastal waters as a cold front approaches from the west and eventually shifts offshore by Tuesday night. Ahead of the front, the area will remain warm-sectored and low-lvl mixing will remain modest. Marine conditions are expected to remain below Small Craft Advisory levels during the day, but winds and seas will increase during the period. A small window for sea fog will also be in place Tuesday morning as lower 60 dewpts spread across the coastal waters, but conditions will become less favorable as the pressure gradient tightens and low-lvl winds become stronger before fropa later Tuesday. Cold air advection in wake of the front should then produce a period of Small Craft Advisory level conditions across a portion of the coastal waters Tuesday night into Wednesday. High pressure will then build across the area from the north through Friday, favoring north/northeast winds around 15-20 kts as the pressure gradient remains somewhat enhanced along the coast. Seas of 6 ft could also persist across offshore Georgia waters during this time, resulting in a Small Craft Advisory late Wednesday into Thursday. A coastal trough/low is then expected to develop across the coastal waters over the weekend, bringing periods of showers and building seas within a northerly wind. Additional Small Craft Advisories could be needed, mainly for northern South Carolina waters and offshore Georgia waters during the weekend.

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

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 13 mi60 min E 1 G 1 54°F 56°F1022.6 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi64 min ESE 3.9 G 3.9 62°F 60°F2 ft1022.1 hPa (+0.0)60°F
41033 44 mi46 min ENE 1.9 G 3.9 56°F 56°F1023.5 hPa

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA2 mi2 hrsN 010.00 miFair45°F43°F92%1021.6 hPa
Savannah-Hilton Head International Airport, GA10 mi61 minN 02.00 miFog/Mist45°F44°F97%1022.3 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA24 mi58 minN 09.00 miFair42°F41°F97%1021.6 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrCalmW3CalmW4W5SW5W5NW5W6W3CalmSE7SE5SE3S3S4S3CalmCalmCalmCalmCalmCalmCalm
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W10W11W6W5----W6W6W7W5W4CalmCalmCalm
2 days agoN6NE8N4N7N8N7NE4N5NW5N4CalmNW4NW7NW4NW6NW5Calm----SE4SE4NW6W4W8

Tide / Current Tables for Isle of Hope, Skidaway River, Georgia
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Isle of Hope
Click for Map
Mon -- 05:15 AM EST     -0.30 feet Low Tide
Mon -- 07:17 AM EST     Sunrise
Mon -- 11:08 AM EST     Moonset
Mon -- 11:44 AM EST     8.90 feet High Tide
Mon -- 05:21 PM EST     Sunset
Mon -- 05:52 PM EST     -0.01 feet Low Tide
Mon -- 10:06 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.36.34.72.70.8-0.201.53.75.97.78.78.98.16.54.42.20.5-00.72.34.15.76.9

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 -- 03:06 AM EST     -2.50 knots Max Ebb
Mon -- 06:18 AM EST     0.00 knots Slack
Mon -- 07:17 AM EST     Sunrise
Mon -- 08:52 AM EST     2.00 knots Max Flood
Mon -- 11:07 AM EST     Moonset
Mon -- 11:44 AM EST     -0.00 knots Slack
Mon -- 03:37 PM EST     -2.85 knots Max Ebb
Mon -- 05:20 PM EST     Sunset
Mon -- 07:06 PM EST     0.00 knots Slack
Mon -- 09:25 PM EST     1.70 knots Max Flood
Mon -- 10:05 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.6-1.4-2.1-2.5-2.2-1.4-0.30.81.721.60.7-0.2-1.1-2-2.7-2.8-2.3-1.3-0.111.61.61

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 (5,6,7,8)
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Ground Weather Radar Station Charleston, SC
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