Wednesday, April21, 2021
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Marine Weather and Tides
Henderson, GA

Version 3.4
NOTICE
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 6:47AMSunset 7:59PM Wednesday April 21, 2021 6:55 AM EDT (10:55 UTC) Moonrise 1:07PMMoonset 2:31AM Illumination 70% Phase: Waxing Gibbous; Moon at 9 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- 602 Am Edt Wed Apr 21 2021
.small craft advisory in effect from 6 pm edt this evening through Thursday morning...
Today..SW winds 5 to 10 kt, becoming W 10 to 15 kt. Seas 1 to 2 ft.
Tonight..NW winds 20 to 25 kt with gusts to 30 kt. Seas 2 to 3 ft, building to 3 to 4 ft away from the coast.
Thu..N winds 15 to 20 kt with gusts to 25 kt, becoming E 5 to 10 kt in the afternoon. Seas 2 to 4 ft.
Thu night..SE winds 5 kt. Seas 1 to 2 ft.
Fri..SE winds 5 to 10 kt. Seas 1 to 2 ft.
Fri night..SE winds 10 to 15 kt. Seas 2 to 3 ft, building to 3 to 4 ft. A chance of showers after midnight.
Sat..S winds 15 to 20 kt. Seas 4 to 6 ft. Showers with a chance of tstms.
Sat night..SW winds 15 to 20 kt. Seas 4 to 6 ft. Showers likely with a slight chance of tstms.
Sun..NW winds 10 to 15 kt. Seas 3 to 4 ft.
Sun night..N winds 5 to 10 kt. Seas 2 to 3 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 602 Am Edt Wed Apr 21 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will cross the area today. High pressure will prevail late week, before a low pressure system impacts the region over the weekend. High pressure will return early 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 211009 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 609 AM EDT Wed Apr 21 2021

. DANGEROUS FIRE WEATHER CONDITIONS LIKELY THIS AFTERNOON INTO EARLY THIS EVENING ACROSS SOUTHEAST SOUTH CAROLINA AND SOUTHEAST GEORGIA .

SYNOPSIS. A cold front will cross the area today. High pressure will prevail late week, before a low pressure system impacts the region over the weekend. High pressure will return early next week.

NEAR TERM /THROUGH TONIGHT/. The forecast looks on track. Incoming high-res guidance suggest dewpoints may need to be lowered another 1-2 degs, but will leave this to the incoming shift after the 12z raob is reviewed. No major changes are needed for the sunrise update.

Today: A dry cold front will push off the coast late this afternoon. Forecast soundings in the pre-frontal warm sector depict a very deep and dry mixing profile developing through the day with mixing heights reaching 7-8.2 kft. Winds throughout the mixed layer will steadily increase this morning, peaking right around the diurnal maximum in the 2-5 pm time frame. Expect breezy west winds of 15-25 mph to prevail with gusts 30-35 mph. The highest winds are expected to occur along/north of I-16, including both the Charleston and Savannah Metro areas where an instance or two of gusts near 40 mph can not be completely ruled out. Although these both sustained winds and wind gusts fall just below Wind Advisory criteria, winds along the elevated bridges could make for difficult driving at times especially for those coastal bridges where a west wind will create nasty cross-wind conditions.

Dewpoints will crater into the upper 30s to lower 40s which combined with critically dry fuels and the ongoing rain deficits will create a potentially dangerous fire weather situation. A Red Flag Warning has been issued. Refer to the fire weather section below for additional details. Highs will warm into the upper 70s to lower 80s with warm temperatures reaching all the way to the beaches with strong offshore winds in place. Skies will be mostly sunny with just a few high-based cumulus passing through.

Tonight: Post-frontal cold air advection will intensify this evening as the cold front clears the coast. Gusty winds should persist for much of the night with speeds diminishing as sunrise approaches. Guidance is mixed on exactly how quickly winds subside, which will have a significant impact on overnight lows. The 21/00z GFS MOS is the coldest of the various operational MOS packages which also shows winds dropping to 5 mph or less right before daybreak. The NAM and ECMWF packages are several degrees warmer and show a bit more wind prevailing. Generally favored the warmest guidance with lows ranging from the upper 30s/near 40 well inland to the mid-upper 40s at the coast, but will have to be watched as colder GFS support lows dropping into the mid-30s across the far interior with lower 40s at the coast.

Lake Winds: Winds will increase on Lake Moultrie today and tonight. Initially, winds will be highest along the lakeshore where mixing will be maximized, but this will change this evening as cold air advection intensifies after FROPA. Will highlight speeds 15-20 kt with gusts to 25 kt at the lakeshore today, then increase to 20 kt tonight over the open lake waters. Waves as high as 1-2 ft will occur today, then build to 2-3 ft tonight. A Lake Wind Advisory has been issued from noon until 8 AM Thursday.

SHORT TERM /THURSDAY THROUGH SATURDAY/. Surface high pressure will expand over the region on Thursday, then shift into the Atlantic on Friday. Aloft, broad troughing over the eastern CONUS will be replaced by subtle ridging. Dry weather and mostly sunny skies will prevail, although there will be an increase in cloud cover late. Unseasonably cool temperatures are expected, especially on Thursday when highs top out in the upper 60s to around 70. Temperatures will moderate to the mid 70s for Friday. Favorable radiational cooling conditions will allow lows Thursday night to fall well into the 40s across most locations inland of the beaches. Friday night temps will be milder with cloud cover and warm air advection. Lows will range from the mid 50s across the interior to around 60/lower 60s at the immediate coast.

The focus of the forecast will be on the weather system Saturday as low pressure is progged to track northeast out of the Arklatex region towards the East Coast. This will send a warm front northward through the local area in the morning, before a cold front eventually crosses Saturday night. Strong moisture transport will bring PWats well above climatology, generally near or over 1.5 inches. Given this and forcing for ascent, the area is expected to receive much needed rainfall. PoPs peak at 90-100%. Forecast rainfall totals for the event are 1-2 inches on average, though locally higher amounts are possible. Most areas will be able to handle this amount of rain given the dry antecedent conditions, but urban areas could see some ponding on roadways within any pockets of heavier rainfall. We will also need to watch the potential for strong to severe storms. Deep layer wind shear will certainly be supportive of storm organization, however models show varying degrees of instability which could be the limiting factor. Will hold off on including mention in the HWO for now and continue to monitor trends.

Otherwise, winds will get a bit gusty during the day with a tightening pressure gradient. Temperatures will be a bit tricky but the current forecast features highs in the mid 70s to near 80, warmest in the south.

LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/. Models are in good agreement in the long term period. High pressure will build into the region on Sunday behind a departing low pressure system and will remain the primary feature through the middle of next week. No forecast concerns are expected with dry conditions and plenty of sunshine. Temperatures will be near to above normal, generally warming with time as ridging builds aloft.

AVIATION /10Z WEDNESDAY THROUGH SUNDAY/. VFR. Gusty winds will impact both KCHS and KSAV from late morning on with speeds peaking mid/late afternoon. Gusts could reaching 26-30 kt at times.

Extended Aviation Outlook: Gusty winds expected on Saturday. Flight restrictions are possible Saturday into Saturday night due to showers/thunderstorms.

MARINE. Today: A cold front will approach from the west today and push offshore this evening. Gusty winds will develop in the Charleston Harbor by late morning with frequent gusts to 25 kt expected. A Small Craft Advisory has been issued beginning at noon. Over the coastal waters, winds will be much more subdued over the more cooler, more stable shelf waters. Winds only look to peak around 15 kt with seas 1-2 ft nearshore waters and 2-3 ft offshore waters. Waves in Charleston Harbor will reach 1-2 ft.

Tonight: Mixing profiles will become increasingly more favorable for strong mixing as cold air advection strengthens after FROPA. Winds look to increase to 20-25 kt for all waters with seas building 2-4 ft nearshore waters and 4-6 over the Georgia offshore waters. In Charleston Harbor, northwest wind trajectories will favor a strong acceleration of winds of 20-25 kt across the length of the entire harbor from the Ravenel Bridge and points south. Waves will build 2-3 ft in this area with 1-2 ft elsewhere. Small Craft Advisories will be in place for all legs overnight.

Thursday through Monday: Winds and seas will quickly improve Thursday as high pressure expands over the region and the pressure gradient eases. The next period of concern is Saturday into Saturday night as low pressure impacts the area. At this time, Small Craft Advisories appear likely for most, if not all, coastal waters including the Charleston Harbor. Conditions will improve for Sunday and Monday as high pressure returns.

FIRE WEATHER. The Fire Weather Watch has been upgraded to a Red Flag Warning for all of Southeast South Carolina and much of Southeast Georgia. Deep mixing profiles within the pre-frontal warm sector will tap into a belt of higher winds aloft to produce gusty west winds from late morning into early this evening. BUFKIT mixing profiles show as much as 20-25 kt of wind within the mixed layer with the peak gust potential maxing out in the 28-32 kt range. This should support ASOS/30 ft winds of 15-25 mph with gusts to 30-35 mph with critically high 20 ft winds. Dewpoints should crater as the mixing of drier air aloft to the surface occurs. Expect minimum RH values of 22-27%, lowest in the Charleston to Savannah corridor by mid/late afternoon.

The combination of low RH, gusty winds and critically dry fuels will yield a potentially dangerous fire weather situation this afternoon and evening for Southeast South Carolina into much of Southeast Georgia. Although winds, fuels and ERC values are bit more marginal over the coastal Georgia zones and extending into Long, Inland Liberty, and Inland McIntosh Counties, fire officials with U.S. Fish and Wildlife out of Savannah indicate fuels are sufficiently critical enough to justify a Red Flag Warning given much of this area has only seen about 10-20% of its normal rainfall over the past 30 days. The Red Flag Warning is in effect from noon until 8 PM.

CHS WATCHES/WARNINGS/ADVISORIES. GA . Red Flag Warning from noon today to 8 PM EDT this evening for GAZ087-088-099>101-114>119-137>141. SC . Red Flag Warning from noon today to 8 PM EDT this evening for SCZ040-042>045-047>052. Lake Wind Advisory from noon today to 5 AM EDT Thursday for SCZ045. MARINE . Small Craft Advisory from 6 PM this evening to 8 AM EDT Thursday for AMZ350-352-354-374. Small Craft Advisory from noon today to 8 AM EDT Thursday for AMZ330.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 17 mi56 min 67°F1013.4 hPa (+0.0)
SAXG1 - Sapelo Island Reserve, GA 42 mi56 min SW 6 64°F 1013 hPa (+0.0)64°F
41033 46 mi48 min SW 7.8 G 12 67°F 68°F1012.1 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 47 mi66 min WSW 5.8 G 7.8 67°F 68°F2 ft1013 hPa (+0.0)66°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, GA4 mi60 minSSW 310.00 miFair62°F60°F92%1012.5 hPa
Savannah-Hilton Head International Airport, GA8 mi63 minWSW 410.00 miFair61°F59°F93%1013.1 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA21 mi60 minN 010.00 miFair57°F56°F96%1012.8 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Tide / Current Tables for Highway bridge, Ogeechee River, Georgia
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Highway bridge
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Wed -- 01:37 AM EDT     0.17 feet Low Tide
Wed -- 03:31 AM EDT     Moonset
Wed -- 06:42 AM EDT     1.00 feet High Tide
Wed -- 06:49 AM EDT     Sunrise
Wed -- 02:07 PM EDT     Moonrise
Wed -- 02:20 PM EDT     0.16 feet Low Tide
Wed -- 07:21 PM EDT     0.91 feet High Tide
Wed -- 07:58 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.20.30.60.8110.90.80.70.50.30.20.20.20.40.60.80.90.90.80.70.5

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Wed -- 01:15 AM EDT     1.82 knots Max Flood
Wed -- 03:30 AM EDT     Moonset
Wed -- 04:50 AM EDT     -0.00 knots Slack
Wed -- 06:47 AM EDT     Sunrise
Wed -- 07:34 AM EDT     -1.67 knots Max Ebb
Wed -- 11:17 AM EDT     0.00 knots Slack
Wed -- 01:46 PM EDT     1.52 knots Max Flood
Wed -- 02:05 PM EDT     Moonrise
Wed -- 05:22 PM EDT     -0.00 knots Slack
Wed -- 07:57 PM EDT     Sunset
Wed -- 08:06 PM EDT     -1.47 knots Max Ebb
Wed -- 11:29 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.81.71.20.6-0.1-1-1.6-1.6-1.5-1.1-0.30.71.41.51.20.80.3-0.5-1.2-1.5-1.4-1.1-0.5

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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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