Friday, December13, 2019
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Marine Weather and Tides
Midway, 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 5:24PM Friday December 13, 2019 12:16 AM EST (05:16 UTC) Moonrise 6:55PMMoonset 8:32AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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- 1002 Pm Est Thu Dec 12 2019
.small craft advisory in effect through Friday afternoon...
Rest of tonight..NE winds 20 to 25 kt with gusts to 30 kt, becoming E 10 to 15 kt late. Seas 5 to 7 ft, subsiding to 4 to 6 ft. A chance of rain late this evening, then rain.
Fri..NE winds 10 to 15 kt with gusts to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 4 to 6 ft, subsiding to 4 to 5 ft in the afternoon. Rain. A slight chance of tstms in the afternoon.
Fri night..S winds 5 kt, becoming sw 10 to 15 kt after midnight. Seas 3 to 4 ft. Showers likely with a slight chance of tstms.
Sat..W winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers in the morning.
Sat night..W winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft, subsiding to 2 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..SE winds 5 to 10 kt. Seas 2 ft.
Mon night..S winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers.
Tue..SW winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely.
Tue night..NW winds 15 to 20 kt. Seas 3 to 4 ft. A chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1002 Pm Est Thu Dec 12 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Strong high pressure north of the area will shift off the coast tonight, as low pressure emerges from the gulf of mexico. The low will track north across our area Friday and will produce widespread rain especially later tonight into Friday night. High pressure will then build over the region and will provide dry and warmer conditions Saturday afternoon through early next week. A cold front will cross the area Tuesday, followed by much cooler high pressure into late next week.


7 Day Forecast for Marine Location Near Midway, GA
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location: 31.73, -81.21     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 130310 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1010 PM EST Thu Dec 12 2019

SYNOPSIS. Strong high pressure north of the area will shift off the coast tonight, as low pressure emerges from the Gulf of Mexico. The low will track north across our area Friday and will produce widespread rain especially later tonight into Friday night. High pressure will then build over the region and will provide dry and warmer conditions Saturday afternoon through early next week. A cold front will cross the area Tuesday, followed by much cooler high pressure into late next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. As of late evening radar indicates some light to moderate rain near the Savannah River moving northeast. Not much change with the latest forecast update. The low- level high pressure wedging in from the north will slowly weaken as low pressure across the Gulf of Mexico slowly strengthens and shifts toward the eastern Gulf Coast. Meanwhile moisture will be on the increase ahead of the upper trough approaching the Mississippi Valley and a coastal trough off the Southeast U.S. coast will increase low- level convergence. All of this means increasing coverage and intensity of rain, especially in GA but also near the southern SC coast toward daybreak. Not exactly sure how much rain will fall however given some mixed signals in the model guidance, as much of our forecast area could end up between heavier rainfall to the south and east over the Atlantic and also to the north and west closer to the Midlands. Temperatures shouldn't change much overnight with lows mainly ranging from the lower-mid 40s well inland to lower-mid 50s near the coast.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/. Significant rainfall Friday and Friday night will highlight this period.

Friday: Ahead of low pressure emerging from the Gulf of Mexico, deep- layered moisture transport will overrun the wedge of surface high pressure in place over the region. As a result, rain will be overspreading the region and should advance to the Santee River as the morning progresses. As the low pressure tracks north/northeast and an associated coastal front intensifies, rain could become heavy at times. Later in the day into Friday evening, as the low pressure passes over or close to our coast, the coastal front could push onshore as a warm front. Thus, for a few hours this scenario could support a couple of stronger thunderstorms with potential for rotation, especially along the coast. However, best low-level instability could remain in the warm sector just offshore, so the probability for severe weather should remain low.

Friday night: The surface low and associated prime overrunning regime/pool of deepest moisture will lift north of the region. However, even as steady rain exits the region, additional scattered/numerous showers should persist through the night as the parent upper trough approaches from the west.

Saturday: As the upper trough advances toward the east coast, Isolated/scattered showers could persist to start the day. Then, most guidance depicts significant drying especially during the afternoon, with elevated west winds pushing high temperatures into the 60s. Of note, the 12Z NAM12 depicts a significant shield of precipitation accompanying the upper trough into our area Saturday later morning into mid-afternoon. However, this solution is not supported by other guidance and has been discounted for the latest forecast.

Saturday night and Sunday: High pressure will provide dry and slightly-above normal temperatures.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. High pressure will shift into the Atlantic Sunday night into Monday, with the area becoming positioned in the warm sector ahead of low pressure tracking into the Ohio River Valley. Meanwhile, heights will build aloft. Large scale subsidence should preclude any rainfall through Monday. The low and associated cold front will approach on Monday night, then pass through the area Tuesday, bringing the next chance of rain with it. Dry high pressure will build in on Wednesday. Temperatures will be well above normal through Tuesday, then fall below normal on Wednesday after frontal passage.

AVIATION /03Z FRIDAY THROUGH TUESDAY/. 00Z KCHS/KSAV TAFS: Moderate to high confidence this period. MVFR conditions to start the period with lowering ceilings/visibilities as deeper moisture and forcing for ascent move into the area later tonight through Friday. This will lead to at least IFR conditions, possibly even LIFR conditions at times due to very low ceilings/heavier rainfall. We also added LLWS at KSAV for several hours to start the period given model data indicating near 40 kt east winds at around 2000 feet along with near 10 kt northeast winds at the surface.

Extended Aviation Outlook: IFR or lower flight categories will prevail much of the time into Saturday morning as low pressure produces rain across the region. VFR will return thereafter and prevail until a cold front arrives with showers Tuesday.

MARINE. Tonight: Persistent, elevated northeast winds will prevail given the tight pressure gradient between inland high pressure and offshore low pressure, although speeds will generally be lowering with time. Small Craft Advisory conditions are expected for all waters to start the evening but Charleston Harbor should improve below Advisory levels later this evening.

Friday through Tuesday: Small Craft Advisories mainly due to elevated seas will be ongoing at the start of this period for all coastal waters. Seas are expected to subside and advisories expire from south to north through the day. The exception would be in the outer Georgia waters where at least 6 ft seas will persist into Saturday. As low pressure tracks over or close to the waters later Friday and Friday evening, a few stronger thunderstorms could prompt Special Marine Warnings. Also of note, dewpoints around 60 degrees, water temperatures in the 50s and a period of light winds could translate to pockets of fog over nearshore marine waters Friday night. Low pressure will advance north of the waters and will pull an associated cold front through the waters by Saturday morning. Thus, a brief surge of offshore winds is expected Saturday afternoon into Saturday night, and additional Small Craft Advisories could be needed for portions of the waters. Then, high pressure will provide tranquil marine conditions Sunday into Monday. Another cold front is expected to cross Tuesday, with S/SW winds increasing ahead of the front and elevated winds shifting to the NW then N after cold fropa Tuesday night. Small Craft Advisories could again be required Tuesday/Tuesday night, especially across AMZ350 and AMZ374.

TIDES/COASTAL FLOODING. Latest tide forecast indicates minor coastal flooding along the SC coast Friday morning while tides along the northern GA coast should remain just low enough to keep the risk of flooding pretty low. However, heavy rainfall could be occurring along the GA coast around the time of this high tide, so this may end up causing some minor flooding anyway. The heavier rain should remain away from the SC coast during the morning high tide. Even after the elevated Friday morning high tide, locally heavy rainfall could produce minor flooding of poor drainage areas in coastal communities into Friday evening.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 1 PM EST Friday for AMZ352-354. Small Craft Advisory until 5 AM EST Sunday for AMZ374. Small Craft Advisory until 4 PM EST Friday for AMZ350.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 27 mi52 min ENE 18 G 24 54°F 57°F1025.7 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 29 mi146 min NE 18 G 21 62°F 62°F7 ft1024.4 hPa (-0.7)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, GA21 mi80 minNE 1110.00 miOvercast53°F46°F79%1025 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA22 mi80 minNNE 810.00 miOvercast50°F43°F77%1025.4 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Tide / Current Tables for Walburg Creek entrance, Georgia
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Walburg Creek entrance
Click for Map
Fri -- 02:48 AM EST     -0.37 feet Low Tide
Fri -- 07:15 AM EST     Sunrise
Fri -- 08:32 AM EST     Moonset
Fri -- 08:44 AM EST     8.44 feet High Tide
Fri -- 03:25 PM EST     -0.02 feet Low Tide
Fri -- 05:21 PM EST     Sunset
Fri -- 06:54 PM EST     Moonrise
Fri -- 09:08 PM EST     6.98 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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31.30-0.30.62.64.978.28.47.76.44.72.81.10.10.21.43.35.16.476.75.7

Tide / Current Tables for Thomas Landing, S. Newport River, Georgia
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Thomas Landing
Click for Map
Fri -- 03:13 AM EST     -0.35 feet Low Tide
Fri -- 07:15 AM EST     Sunrise
Fri -- 08:32 AM EST     Moonset
Fri -- 09:25 AM EST     8.69 feet High Tide
Fri -- 03:50 PM EST     -0.01 feet Low Tide
Fri -- 05:22 PM EST     Sunset
Fri -- 06:55 PM EST     Moonrise
Fri -- 09:49 PM EST     7.18 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.12.20.6-0.301.63.867.78.68.57.55.93.91.90.4-00.82.44.35.96.97.26.6

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (0,6,7,8)
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Ground Weather Radar Station Charleston, SC
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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 numerious 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.