Monday, January25, 2021
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Marine Weather and Tides
Whitemarsh Island, GA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:20AMSunset 5:53PM Monday January 25, 2021 6:48 PM EST (23:48 UTC) Moonrise 3:00PMMoonset 4:48AM Illumination 94% Phase: Waxing Gibbous; Moon at 12 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- 347 Pm Est Mon Jan 25 2021
.dense fog advisory in effect until 7 pm est this evening...
Tonight..SW winds 10 to 15 kt. Seas 2 to 3 ft. Areas of fog. Vsby 1/2 nm or less this evening.
Tue..SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Areas of dense fog. A slight chance of showers and tstms in the afternoon. Vsby 1 nm or less.
Tue night..SW winds 10 to 15 kt. Seas 2 to 3 ft. Areas of dense fog in the evening. A chance of showers with a slight chance of tstms. Vsby 1 nm or less in the evening.
Wed..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of tstms. A slight chance of showers in the morning, then showers in the afternoon.
Wed night..W winds 15 to 20 kt, becoming nw 20 to 25 kt after midnight. Seas 2 to 3 ft, building to 3 to 4 ft after midnight. A chance of showers in the evening.
Thu..NW winds 20 to 25 kt with gusts to 30 kt, becoming N 15 to 20 kt in the afternoon. Seas 3 to 4 ft.
Thu night..N winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft.
Fri..NE winds 10 to 15 kt. Seas 2 to 3 ft.
Fri night..W winds 5 kt. Seas 2 ft.
Sat..E winds 5 to 10 kt. Seas 2 ft.
Sat night..S winds 10 kt. Seas 2 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 347 Pm Est Mon Jan 25 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A storm system will impact the region Tuesday into Wednesday, before a strong cold front pushes offshore late Wednesday night. High pressure will return late week. Another cold front could impact the area early next week.


7 Day Forecast for Marine Location Near Whitemarsh Island, GA
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location: 32.08, -81.03     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 252104 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 404 PM EST Mon Jan 25 2021

SYNOPSIS. A storm system will impact the region Tuesday into Wednesday, before a strong cold front pushes offshore late Wednesday night. High pressure will return late week. Another cold front could impact the area early next week.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. This Evening and Tonight: A low pressure system will continue to strengthen across the Central United States and track toward the Midwest with an eastward extending warm front remaining north of the area while an area of high pressure remains centered well off the Southeast Coast. Expect dry conditions to prevail this evening and tonight with a lack of moisture between these two features aloft. However, dense fog across coastal waters this evening could impact much of the shoreline early tonight, then mainly the Charleston County coast after midnight given the trajectory of light south-southwest winds. A warm southerly flow will prevail well ahead of a cold front approaching the region late, helping maintain mild temps through the overnight period. In general, lows should range in the upper 50s to around 60 degrees.

Tonight: A cold front will sweep east across middle TN and the Deep South. Steady return flow ahead of the cold front will result in H85 temperatures to rise from 11-12C this evening to 13-14C late tonight. In addition, following a few rounds of cloud breaks this afternoon and evening, clouds will increase ahead of the cold front. The combination of steady WAA and thickening cloud cover will result in very mild temperatures tonight. Low temperatures may range around 60 degrees, close to the normal high temperatures values for the date. In addition, conditions across the shelf waters of the Atlantic will become very supportive for sea fog development. Based on the steady SW winds, fog will likely brush the coast late tonight, possibly building onshore along the Charleston County coast.

SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/. Tuesday: The cold front will steadily slow as it moves across the Southeast U.S. Tuesday as low pressure moves into the Ohio Valley and the entire frontal surface becomes parallel to the flow aloft. Ahead of the front, increasing warm air advection driven by a strengthening low-level jet will support increasing shower activity through the day with a notable uptick expected to occur during the afternoon hours. There is still some disagreement among the various CAMs on where the greatest coverage of rain will setup, but the general trend is for a wetter solution for the late afternoon hours, especially for Southeast Georgia into far southern South Carolina where 300-305K isentropic ascent will be the strongest. Pops were increased about 10% in this region, but higher pops may be needed if this wetter trend persists.

The focus for shower activity will gradually shift inland Tuesday night as the surface front moves even closer and a frontal waves begins to form along the front in response to a potent shortwave digging into the Mid-Mississippi Valley. While shower coverage should diminish along/south of I-16 up to the Beaufort/Hilton Head region, activity is expected to expand across the far inland zones into the Charleston Tri-County area as upper forcing increases from the west and interacts with the front. By daybreak Wednesday, expect a fairly large area of showers to be in place from Millen-Walterboro- Charleston Metro. A risk for sea fog impacting the beaches/coastal communities will linger through the day, but should diminish Tuesday night as low-level wind fields increase even more.

Warm conditions will persist with highs reaching into the mid-upper 70s with a few spots potentially hitting 80 degrees along/south of the I-16 corridor. This is close to record levels, especially at KSAV. Lows Wednesday morning will range from the mid-upper 50s inland where steadier rains are expected to the lower 60s elsewhere.

Wednesday: This looks to be the wettest period of the forecast. Rain will steadily increase through the morning then peak during the late morning/early afternoon as low-level convergence, deep-layered omega and 850 hPa moisture transport all maximize during this time. Widespread rain will begin to shift to the coast by mid-late afternoon with rain quickly ending from west-east during the late afternoon/early evening as the frontal wave exits the area and the trailing cold front pushes offshore. Pops were increased to 90-100% for all areas with a general QPF of 1-2". Expect dry conditions to prevail by midnight, if not sooner. Highs are proving tricky, especially inland where the combination of rain and some wavering of the surface front could result much tighter thermal gradient. Highs will range from the lower 60s well inland to the lower 70s in the Richmond Hill-Darien-Ludowici corridor. Again, the gradient may very well end up tighter than this with cooler conditions well inland and warmer to the south. Breezy conditions will develop overnight as strong cold air advection occurs behind the front. Lows will fall into the upper 30s inland to the mid 40s at the beaches with wind chills running about 5-10 degrees cooler.

Thursday: Much drier and calmer weather will prevail as high pressure builds in to the region. It will be considerably cooler as post-frontal cold air advection wanes with highs only warming into the lower-mid 50s.

Lake Winds: Winds will rapidly increase across Lake Moultrie Wednesday evening as the cold front pushes through and post-frontal cold air advection intensifies. Although lake water temperatures are running around 50F, mixing profiles should support a solid 20 kt with frequent gusts to 25-30 kt. Waves will build to 2-3 ft, highest over the central and southeast portions of the lake. A Lake Wind Advisory will likely be needed for Wednesday night and possibly after daybreak Thursday depending on how quickly post-frontal cold air advection wanes.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/. Cool and dry high pressure will extend across the region through late week, before shifting into the Atlantic over the weekend. Another cold front will approach from the west on Sunday, bringing the next chance of rain to the area. Temperatures will gradually warm through the period as the airmass modifies.

AVIATION /21Z MONDAY THROUGH SATURDAY/. VFR conditions will prevail at both terminals this evening. Ceilings should begin to gradually lower tonight as a cold front approaches from the west late, but conditions are expected to remain VFR through 18Z Tuesday. South-southwest winds should gust up to 15-20 kt at both terminals Tuesday afternoon.

Extended Aviation Outlook: IFR likely in low clouds and moderate rain late Tuesday night through Wednesday evening. Risk for low- level wind shear Tuesday night through Wednesday morning. Gusty winds likely Wednesday night into Thursday morning behind a strong cold front.

MARINE. This Evening and Tonight: Sfc high pressure will remain centered well off the Southeast Coast while a warm front remains north of the area. The setup will yield a south-southwest wind across all marine zones through the overnight period well ahead of a cold front approaching from the west. Wind speeds should peak between 10-15 kt this evening (the exception being across the CHS Harbor where gusts up to 20 kt are possible into early evening). Winds should then increase slightly overnight, gusting upwards to 15-20 kt at times as the pressure gradient and low- lvl wind fields strengthen across local waters. Seas should slowly build throughout the evening and night, starting between 2-4 ft early this evening, then reaching 3-5 ft overnight.

Sea Fog: South-southwest winds occurring well ahead of an approaching cold front has led to dewpts increasing to around 60 over cooler shelf waters displaying temps around 55 degrees. Latest webcams, visible satellite imagery and pilot boat observations have indicated areas of fog with some locations experiencing vsbys below 1/2 NM. A Dense Fog Advisory will therefore remain in effect until 7 PM for all nearshore waters outside the CHS Harbor given warm and moist air continuing over the cooler waters and winds paralleling the coast. Fog should persist across local waters tonight, including the CHS Harbor after the low-lvl inversion develops. Additional Dense Fog Advisories could be needed early tonight.

Tuesday through Saturday: Southwest winds will be slow to ramp up Tuesday within 10 NM of the coast where a strong marine layer should keep speeds in check and limit mixing. By Wednesday, the cold front could briefly dip into the waters before low pressure quickly retreats the front north. Some gusty winds could accompany the wind shift, but speeds should remain below Small Craft Advisory thresholds. Winds will rapidly increase Wednesday evening as a cold front shifts offshore and post-frontal cold air advection intensifies. There are increasing chances that frequent gusts to gale force could occur across all legs, but especially over the Georgia offshore and Charleston nearshore waters where SSTs are running warmer. Gale Watches/Warnings could be needed, but Small Craft Advisories are a certainty. Winds and seas will improve late week as the pressure gradient eases. No additional concerns expected through early weekend.

Sea Fog: The risk for sea fog will persist into Tuesday, but should diminish Tuesday night through FROPA given increasing low-level winds. Additional Marine Dense Fog Advisories may be needed for vsby 1 NM or less.

CLIMATE. Record highs for 26 January: KCHS: 80/1949 KCXM: 79/1949 KSAV: 81/1974 and 1962

Record high min for 26 January: KCHS: 59/1949 KCXM: 60/1974 KSAV: 62/1974

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Dense Fog Advisory until 7 PM EST this evening for AMZ350-352- 354.



NEAR TERM . DPB SHORT TERM . ETM LONG TERM . ETM AVIATION . DPB MARINE . DPB/ETM CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi48 min SSW 4.1 G 6 62°F 54°F1015.2 hPa (+1.3)
41033 36 mi40 min SW 9.7 G 14 58°F 56°F1014.8 hPa
ACXS1 - ACE Basin Reserve, SC 45 mi63 min SE 1 62°F 1015 hPa60°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 48 mi58 min SSW 14 G 16 61°F 57°F3 ft1014.3 hPa (-0.0)61°F
SAXG1 - Sapelo Island Reserve, GA 48 mi48 min S 8 65°F 1014 hPa (+0.0)61°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, GA7 mi52 minS 69.00 miOvercast70°F62°F76%1013.8 hPa
Savannah-Hilton Head International Airport, GA10 mi55 minSW 410.00 miMostly Cloudy75°F60°F60%1014.3 hPa
Hilton Head Island, Hilton Head Airport, SC20 mi58 minSSW 79.00 miMostly Cloudy64°F63°F94%1015.2 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hr----Calm----CalmCalm------CalmCalm--CalmS6S7------S8
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1 day ago----------------------------------E13------------
2 days ago------------------------------------------------

Tide / Current Tables for Fort Jackson, Savannah River, Georgia
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Fort Jackson
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Mon -- 04:47 AM EST     Moonset
Mon -- 05:45 AM EST     7.31 feet High Tide
Mon -- 07:21 AM EST     Sunrise
Mon -- 12:28 PM EST     0.75 feet Low Tide
Mon -- 02:59 PM EST     Moonrise
Mon -- 05:51 PM EST     Sunset
Mon -- 06:12 PM EST     6.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.31.12.84.66.27.17.36.85.74.32.81.60.90.91.93.34.85.96.46.25.442.41.1

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Mon -- 02:40 AM EST     2.04 knots Max Flood
Mon -- 04:47 AM EST     Moonset
Mon -- 06:23 AM EST     -0.00 knots Slack
Mon -- 07:20 AM EST     Sunrise
Mon -- 09:47 AM EST     -1.74 knots Max Ebb
Mon -- 12:49 PM EST     0.00 knots Slack
Mon -- 02:58 PM EST     Moonrise
Mon -- 03:12 PM EST     1.49 knots Max Flood
Mon -- 05:51 PM EST     Sunset
Mon -- 06:44 PM EST     -0.00 knots Slack
Mon -- 09:45 PM EST     -1.54 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.11.21.921.61.10.4-0.6-1.4-1.7-1.7-1.5-0.80.21.11.51.410.5-0.2-1-1.5-1.5-1.4

Weather Map
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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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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.