Saturday, October16, 2021
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Marine Weather and Tides
Henderson, GA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:28AMSunset 6:52PM Saturday October 16, 2021 4:47 AM EDT (08:47 UTC) Moonrise 4:10PMMoonset 2:31AM Illumination 77% Phase: Waxing Gibbous; Moon at 10 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- 319 Am Edt Sat Oct 16 2021
.small craft advisory in effect from this evening through Sunday morning...
Today..SW winds 10 kt. Seas 1 to 2 ft. Isolated showers this afternoon.
Tonight..NW winds 20 to 25 kt, becoming N after midnight. Seas 2 to 3 ft, building to 3 to 4 ft away from the coast. Isolated showers in the evening.
Sun..N winds 15 to 20 kt. Gusts to 25 kt in the morning. Seas 4 to 5 ft, except 2 to 3 ft near the coast, subsiding to 2 to 4 ft throughout.
Sun night..N winds 10 to 15 kt. Seas 2 to 3 ft.
Mon..NE winds 10 to 15 kt with gusts to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft.
Mon night..NE winds 5 to 10 kt. Seas 2 to 3 ft.
Tue..NE winds 5 to 10 kt. Seas 2 ft.
Tue night..E winds 5 kt. Seas 2 ft.
Wed..NE winds 5 kt. Seas 2 ft.
Wed night..SE winds 5 to 10 kt. Seas 2 ft.
AMZ300 319 Am Edt Sat Oct 16 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will push offshore this evening. High pressure will prevail across the region most of next week, followed by a cold front towards the end of next week.


7 Day Forecast for Marine Location Near Henderson, GA
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location: 32.03, -81.22     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 160800 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 400 AM EDT Sat Oct 16 2021

. NEAR RECORD WARMTH TODAY FOLLOWED BY SHARPLY COOLER CONDITIONS TONIGHT INTO EARLY NEXT WEEK .

SYNOPSIS. A cold front will push offshore this evening. High pressure will prevail across the region most of next week, followed by a cold front towards the end of next week.

NEAR TERM /THROUGH TONIGHT/. Today: A polar cold front will approach from the west today and push offshore early this evening as its supporting upper trough digs across the Great Lakes and into New England. Westerly flow ahead of the front coupled with H8 temperatures near 16C will support a rather warm day for the area with highs poised to reach into the upper 80s away from the beaches with a few spots nearing 90 in the KLHW-KSAV-KNBC-KCHS corridor. Record highs could be challenged at all three climate sites prior to the arrival of possible shower activity later in the afternoon, but much will depend on how quickly surface temperatures warm after the nocturnal inversion mixes out and before pre-frontal cumulus begins to develop across the region. A very weak resultant is likely to develop along parts of the lower South Carolina coast, but will make little headway given the strong westerly flow noted in the 925-700 hPa layer.

Morning radar composites show a thin line of showers stretching from the Ohio Valley into the northwest Gulf of Mexico just ahead of the cold front. As the upper trough and cold front propagate east, the line of showers will move steadily east as well moving across much of the Deep South this morning. High-res guidance suggest these showers will dissipate as they move into central Georgia later in the day where a drier airmass develops in response to the 850 hPa flow veering west with time ahead of the front. Showers will really not get a chance to reform until the front reaches the east-central Georgia, the CSRA and Southern Midlands later this afternoon where better moisture quality and a slightly more unstable atmosphere will be found. Showers will likely be in a redeveloping phase as the line crosses into Southeast South Carolina and Southeast Georgia, especially along/east of the I-95 corridor. 20-30% were maintained for this afternoon and into the early evening with the greatest coverage centered across Charleston, eastern Berkeley and southern Colleton Counties where a weak resultant could interact with the approaching front and help to enhanced low-level convergence somewhat. Mean instability looks to remain less than impressive with HREF ensemble mean SBCAPE values remaining less than 700 J/kg, except right along the immediate Charleston and Colleton County coasts and into the Atlantic coastal waters. A mention of tstms was left out of the forecast for now given the both the kinematic and thermodynamic environments are only marginal for the formation of deep, moist convective updrafts. This can be revisited later today once the 16/12z raobs are processed.

Tonight: The cold front will emerge off the coast around sunset with any associated shower activity pushing offshore with it. Modest post frontal cold air advection will spread into the region overnight helping to usher in a modified cP airmass into the Southeast States. Lows tonight will drop into the upper 40s/near 50 well inland to the upper 50s along the barrier islands and beaches, including Downtown Charleston.

Lake Winds: Model time-sections over Lake Moultrie show a pronounced low-level, vertically deep wind surge working across the lake this evening and overnight within the post frontal cold air advection regime. Model soundings suggest a mixed layer as deep as 4 kft AGL will develop over the open lake waters overnight as mid-level temperatures cool and lake water temperatures hold in the upper 70s. The NAM/RAP and GFS all show max winds within the core of the surge (~1.5 kft AGL) reaching as high as 30 kt with should be sufficient for surface winds reaching as high 20 kt with gusts 25-30 kt, mainly over the central and southeast portions of the lake. Per coordination with WFO Columbia, a Lake Wind Advisory will be posted 8 PM until 8 AM Sunday for Lake Moultrie. Waves will average 1-2 ft with local sets reaching as high as 3 ft along the southeast side of the lake.

SHORT TERM /SUNDAY THROUGH TUESDAY/. Mid-level troughing will be over the East Coast on Sunday. It'll gradually get pushed offshore Monday into Tuesday, as a ridge moves in from the west. Surface high pressure centered over the Southern Plains on Sunday will shift eastward, becoming located over the Southeast Monday, and prevailing into Tuesday. The high will dominate our weather all three days, bringing dry conditions with minimal clouds. The big change will be the temperatures in a much cooler airmass. Even with full sunshine, thickness values only support highs in the lower 70s on Sunday. We leaned towards this due to some warming from partial downslope flow off the distant Appalachians. Also, with good mixing it'll be breezy Sunday morning and afternoon, especially along the coast. High temperatures will be about 1-2 degrees warmer on Monday, moderating a few more degrees to near normal on Tuesday. The dry airmass, mostly clear skies, and light winds will yield temperatures well below normal Sunday and Monday nights. Sunday night will be the coldest night for our area so far this fall with lows generally ranging from the lower/mid 50s near the beaches to the lower/mid 40s far inland. These temperatures should moderate a few degrees Monday night.

LONG TERM /TUESDAY NIGHT THROUGH FRIDAY/. Weak mid-level ridging initially over the East Coast will transition to weak troughing by Friday. The surface forecast from the WPC is for high pressure to prevail across the Southeast, then move offshore late Thursday. A cold front may move through the region on Friday. The NBM is in line with this, forecasting dry conditions through Thursday and then low chances for showers on Friday. Temperatures will be a few degrees above normal.

AVIATION /06Z SATURDAY THROUGH WEDNESDAY/. VFR. A narrow band of showers will approach the terminals this afternoon as a cold front pushes offshore. The best chances for impacts looks to be at KCHS and possibly KJZI from roughly 21-23z while KSAV looks to remain displaced from the best forcing. Will carry VCSH for both KCHS and KJZI for now with no mention at KSAV. The line will move through very quickly and will likely have little meaningful impact should showers occur.

Extended Aviation Outlook: Expect gusty northerly winds behind a cold front Sunday morning. Otherwise, VFR will prevail.

MARINE. Today: South to southwest winds will prevail today as a cold front approaches from the west. Subtle low-level jetting and a tightening pressure gradient could support speeds as high as 15 kt over the Charleston County waters later this afternoon, otherwise speeds will remain less than 15 kt with seas 1-3 ft.

Tonight: A cold front will push across the waters this evening. Hazardous conditions will occur over all waters overnight as winds surge in response to modest post-frontal cold air advecting over the warm Atlantic waters. Deep mixing will support north winds 20-25 kt with gusts to 30 kt with 20 kt with gusts to 25 kt in the Charleston Harbor. Waves will build to 3-5 ft over the nearshore waters and as high as 5-6 ft over the Georgia offshore waters where the longer, northerly wind fetch will promote a stronger wave response. Waves in Charleston Harbor will also build to 1-2 ft with local sets near 3 ft at times. Small Craft Advisories are in force for all legs tonight.

Sunday: Small Craft Advisories will be in effect for all of the ocean zones in the morning. High pressure is forecasted to build from the west with time. The elevated winds are forecasted to quickly ease in the morning due to slackening cold air advection and less pronounced pressure rises. With improving conditions, the Small Craft Advisories are expected to end, first for the waters within 20 nm, then for the GA waters beyond 20 nm because seas will take a little bit longer to subside there. Winds are expected to increase a few kt during the evening and overnight hours. But they'll remain short of advisory criteria.

Monday through Wednesday: High pressure will prevail over the Southeast, bringing tranquil marine conditions.

CLIMATE. Record High Temperatures for October 16: KCHS: 90/2018 KSAV: 91/2018 KCXM: 88/2018

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . Lake Wind Advisory from 8 PM this evening to 8 AM EDT Sunday for SCZ045. MARINE . Small Craft Advisory from 8 PM this evening to 11 AM EDT Sunday for AMZ350-352-354. Small Craft Advisory from 8 PM this evening to 5 PM EDT Sunday for AMZ374. Small Craft Advisory from 8 PM this evening to 8 AM EDT Sunday for AMZ330.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 17 mi53 min WSW 4.1G5.1 73°F 78°F1013.4 hPa
SAXG1 - Sapelo Island Reserve, GA 42 mi47 min WSW 4.1 72°F 1013 hPa (-1.0)72°F
41033 46 mi39 min WSW 9.7G18 77°F 78°F1012.2 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 47 mi57 min SW 9.7G12 77°F 80°F2 ft1012.7 hPa (-0.7)

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA4 mi51 minN 010.00 miFair67°F63°F86%1013.1 hPa
Savannah-Hilton Head International Airport, GA8 mi54 minSW 510.00 miFair69°F67°F93%1013.4 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA21 mi51 minSW 45.00 miFog/Mist69°F66°F93%1013.1 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hr00000000000S7S7SE40000000000
1 day ago0000000E6NW3N4SE5SE5SE6--SE3000000000
2 days ago00000N6NE8E5--NE4E6NE3E8E80000000000

Tide / Current Tables for Highway bridge, Ogeechee River, Georgia
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Highway bridge
Click for Map
Sat -- 03:31 AM EDT     Moonset
Sat -- 03:57 AM EDT     0.10 feet Low Tide
Sat -- 07:29 AM EDT     Sunrise
Sat -- 08:43 AM EDT     1.07 feet High Tide
Sat -- 04:14 PM EDT     0.11 feet Low Tide
Sat -- 05:09 PM EDT     Moonrise
Sat -- 06:51 PM EDT     Sunset
Sat -- 09:20 PM EDT     1.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 12:27 AM EDT     0.00 knots Slack
Sat -- 03:10 AM EDT     1.87 knots Max Flood
Sat -- 03:30 AM EDT     Moonset
Sat -- 06:36 AM EDT     -0.00 knots Slack
Sat -- 07:27 AM EDT     Sunrise
Sat -- 10:13 AM EDT     -2.09 knots Max Ebb
Sat -- 12:46 PM EDT     0.00 knots Slack
Sat -- 03:58 PM EDT     1.99 knots Max Flood
Sat -- 05:08 PM EDT     Moonrise
Sat -- 06:49 PM EDT     Sunset
Sat -- 07:17 PM EDT     -0.00 knots Slack
Sat -- 10:43 PM EDT     -2.35 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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