Marine Weather and Tides
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
|Sunrise 7:29AM||Sunset 7:39PM||Monday March 19, 2018 6:34 AM EDT (10:34 UTC)||Moonrise 8:01AM||Moonset 8:54PM||Illumination 7%|
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|AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 330 Am Edt Mon Mar 19 2018 |
Today..E winds 10 kt, becoming se 5 to 10 kt. Seas 2 to3 ft. A chance of tstms. Showers, mainly this morning.
Tonight..SE winds 10 kt, becoming sw after midnight. Seas 2 to 3 ft. A chance of showers and tstms.
Tue..SW winds 10 to 15 kt. Seas 2 to 3 ft, building to 3 to 4 ft in the afternoon. A chance of tstms. A chance of showers in the morning, then showers likely in the afternoon.
Tue night..SW winds 15 to 20 kt, becoming W 20 to 25 kt with gusts to 30 kt after midnight. Seas 3 to 4 ft, building to 4 to 5 ft after midnight. A chance of showers in the evening.
Wed..W winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon.
Wed night..NW winds 20 to 25 kt. Seas 3 to 4 ft.
Thu..NW winds 15 to 20 kt. Seas 2 to 3 ft.
Thu night..NW winds 10 to 15 kt. Seas 1 foot.
Fri..NE winds 10 to 15 kt. Seas 2 ft.
Fri night..S winds 5 to 10 kt. Seas 2 ft. Mariners are reminded that winds and seas higher in and near tstms.
|AMZ300 330 Am Edt Mon Mar 19 2018 |
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A stationary front over southeast georgia will lift north as a warm front today and tonight, as an area of low pressure moves through the tennessee valley. Another area of low pressure and trailing cold front will cross the area by Tuesday night, followed by cooler high pressure for the latter half of the week. A cold front could impact the area next weekend.
7 Day Forecast for Marine Location Near Statesboro, GAHourly EDIT Help
Area Discussion for - Charleston, SC  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus62 kchs 190819|
area forecast discussion
national weather service charleston sc
419 am edt Mon mar 19 2018
A stationary front over southeast georgia will lift north as a
warm front today and tonight, as an area of low pressure moves
through the tennessee valley. Another area of low pressure and
trailing cold front will cross the area by Tuesday night,
followed by cooler high pressure for the latter half of the
week. A cold front could impact the area next weekend.
Near term through tonight
The stationary front is aligned generally in an east-west
fashion near and just south of the altamaha river basin, well
depicted by winds that are e-ne across the area, and various
thermodynamic parameters on the SPC meso-analysis page. The
timing of when this front transitions into a warm front and
lifts back north poses the most serious forecast problem of the
A closed mid level cyclone moving east through the mid
mississippi valley today will reach into the ohio by late
tonight. It is near this feature that the best short wave energy
will occur, while locally we just find very minor perturbations
within the generally zonal flow aloft. The associated surface
low will follow a similar path, with a triple point low forming
near the north carolina south carolina border by 12z Tuesday.
During this transition, the stationary front will gradually
become a northward lifting warm front, but is temporarily
blocked by cad with the rains north of the front this morning.
Latest thinking is that the warm front will make it to near the
savannah river this evening, passing into the south carolina
counties late evening and early overnight, and then north of the
entire region before daybreak Tuesday. However, even at this
stage the timing of the warm front lifting north is still
uncertain, but this is our best forecast as of this morning.
Strong isentropic ascent along with difluence from the upper
jet will support significant coverage of showers this morning,
with categorical pop to occur through 7-9 am. Over south
carolina this is in the form of light to moderate rains, while
over georgia the main driver is an MCS covering much of southern
georgia and riding east along the front. It's with this mcs
where we do find some instability, mainly elevated, that will
result in a slight chance to chance of t-storms, mainly near the
altamaha river. Severe weather is not expected with this
The bulk of the rains and t-storms will be offshore by mid
morning, leaving us with a lull in activity for the late morning
and early to mid afternoon period. Maybe not completely
rainfree, but coverage is way down from what it is this morning.
Higher probabilities will arrive over georgia late, and into
south carolina tonight, generally in the high end chance range.
Depending upon when the warm front lifts north will determine
how much surface based instability will reach into our forecast
area late in the day and more so tonight. The low level lapse
rates both today and tonight are underwhelming, but there is
steepening mid level lapse rates, strong 0-6 km shear of 50-60
kt and if enough CAPE is able to develop there is a risk for
severe weather. This would be possible during the late
afternoon early evening across our georgia zones, mainly south
of i-16, then encompasses the entire area during tonight. The
negating factor tonight will be the nocturnal environment, which
climatologically is not the most favored for severe weather in
our area. But some recent events have proven otherwise. Should
any severe weather occur the main risk would be for damaging
winds, but with cold mid level temps and low wet bulb zero
heights, large hail is also a distinct possibility. Shear
profiles support an isolated tornado risk as well.
We stayed very close to the wpc forecast regarding qpf, which
supports around 1 3 to 1 2 inch today and tonight with locally
higher amounts. And while this rainfall will be highly
beneficial for fire weather concerns, it does not pose much of
threat for significant flooding due to the fast movement of
showers and t-storms, unless training occurs.
Temps today will be much cooler than yesterday, and with the
cad in place we could even be too warm. For now we have blended
with our neighboring offices, showing mid 60s near the santee
river, upper 60s and lower 70s most elsewhere, but with some mid
70s close to the altamaha river. Temps will only cool about
6-12f tonight, if that, but with rising temps to occur in wake
of the warm front.
A small concern for tonight is the possibility of stratus
build-down leading to some fog. But the strength of the low
level wind fields suggests that any fog is highly unlikely.
Short term Tuesday through Thursday
Tuesday will be the most active day of the period. The forecast area
will remain in the warm sector ahead of a developing area of low
pressure, which will pass just to our north later in the day. Aloft,
a vigorous shortwave trough will swing east across georgia towards
the local area through the day. Shortwave energy in conjunction with
upper divergence will provide the lift needed for convection, while
a 35-knot low level jet pumps in the moisture. Precipitable water
values are forecast to climb to near climatological maximums for mid-
march. Attention then turns to the potential for severe weather,
which is looking more favorable than previous runs. Models are in
agreement showing CAPE of 1500-2000 j kg with an impressive pocket
of steep mid level lapse rates, and deep layer shear of 50-55 knots.
The combination of these features will be supportive of severe
thunderstorms. Primary threats are large hail, damaging wind gusts,
and perhaps isolated tornadoes given low LCL heights and helicity
values. Timing for severe weather appears to be late morning to
early evening, prior to cold front passage and drying. The entire
forecast area is in the game for severe weather, but the best
conditions lie closer to the coast. This lines up well with SPC day
2 outlook which features an enhanced risk across the coastal
counties, and then slight marginal risk further inland. Will
highlight this potential within the hwo. Otherwise, southwest flow|
will help boost temperatures well above normal yet again. Highs are
forecast to peak in the mid to upper 70s. Low temperatures Tuesday
night will fall near normal.
The surface low will shift offshore Tuesday night and then lift
northeast away from the area on Wednesday. Aloft, the base of a
longwave trough will remain positioned overhead. Some light rain may
linger across the northern zones on the backside of the surface low,
but largely precip will be exiting the area. Clouds will also be
clearing from south to north. Of bigger interest for the day will be
the winds. A tight pressure gradient will result in breezy west
winds with gusts 30-35 mph likely. Highs will be drastically cooler
than previous days, ranging from mid 50s across northern zones to
low 60s near the altamaha. Low temperatures Wednesday night are
forecast to drop into the upper 30s across inland locations.
Elevated winds will preclude any frost issues.
Surface high pressure will continue to build in from the northwest
on Thursday. Deep dry air will keep skies clear and rain-free
conditions. Temperatures will continue to be below normal, with
highs around 60 low 60s.
Long term Thursday night through Sunday
Models remain in fairly good agreement through the long term period.
Surface high pressure will drift overhead on Friday and then
eventually into the atlantic by Saturday. A cold front will approach
from the west on Saturday, and then cross the area sometime late
weekend. Moisture doesn't appear overly impressive so little, if
any, precipitation is expected to accompany it. Temperatures will
gradually warm through the period as flow turns more southerly.
Aviation 08z Monday through Friday
The backdoor cold front now south of both airfields will remain
stationary the first part of today, before lifting back north
as a warm front late in the day and tonight. The air mass
remains quite stable north of the front, which supports only
-shra overnight into this and early afternoon. But as the front
makes makes some progress back to the north, instability will
advance into ksav, and we have maintained a prob30 group for
possible -tsra from 20-23z. Confidence though isn't that
great. At kchs we have higher confidence that -tsra will not
reach the terminal into early tonight.
Guidance has been aggressive on low ceilings at both sites, and
looking at surrounding observations we have backed off on the
previous idea of ifr MVFR conditions by several hours. In fact
we felt more confidence in not showing anything lower than MVFR
ceilings, with the caveat that adjustments would occur should
ifr be more likely, which is certainly possible as shown by
observations in parts of georgia.
One last note is the MCS over southern georgia, which could
pose problems at ksav this morning, possibly resulting in
heavier rainfall than now indicated with the latest TAF set,
plus a low end risk for tsra.
Extended aviation outlook: flight restrictions likely Tuesday as
showers tstms associated with a cold front impact the region.
Clearing will take place Wednesday, withVFR expected the rest of
the week. Breezy conditions likely Wednesday.
Today and tonight: a stationary front just south of the georgia
waters will linger nearby the first part of the day, before
transitioning into a warm front late today and lifting north
through the waters tonight. Easterly winds at or below 15 kt
north of the front will clock around to the s-sw in its wake as
speeds climb to a solid 15-20 during tonight. Seas will average
2-4 ft today, building about a foot tonight. There is some
potentially for gradient winds to reach 25 kt late tonight, but
not enough to warrant a small craft advisory.
One concern for mariners will be the risk of t-storms today and
tonight, a few of which could become strong or severe with
damaging winds and a low end risk for isolated waterspouts.
Dangerous lightning will also occur.
A secondary concern is the small opportunity for sea fog to form
tonight, mainly from about 9 pm to midnight on the georgia
nearshore waters, and from midnight to 3 am on the south
carolina waters. This could occur before winds become too
strong, given a s-sw flow and dew points that are higher than
the underlying waters. No mention in the forecast at this time
since the overall potential is low.
Tuesday through Saturday: marine conditions will deteriorate on
Tuesday as the pressure gradient tightens ahead of an area of low
pressure. The low will pass offshore Tuesday night, but strong
pressure rises will keep elevated winds seas through Wednesday.
Small craft advisories will likely be needed, beginning as early as
late Tuesday morning in the outer georgia waters, and then spreading
to most, if not all, waters later in the day. Could even see some
gusts to gale force in the outer georgia waters for a period of time
Tuesday night through Wednesday morning. Too early to hoist a gale
watch at this time, but certainly something to watch. Winds and seas
will improve on Thursday as high pressure builds in and the gradient
slackens. The high will drift overhead Friday and then into the
atlantic by Saturday, allowing winds to become southerly.
Chs watches warnings advisories
short term... Ect
long term... Ect
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|FPKG1 - 8670870 - Fort Pulaski, GA||55 mi||47 min||N 11 G 14||61°F||60°F||1009.8 hPa|
|ACXS1 - ACE Basin Reserve, SC||73 mi||110 min||N 1||58°F||1010 hPa||58°F|
|SAXG1 - Sapelo Island Reserve, GA||74 mi||95 min||N 1.9||62°F||1008 hPa (-2.0)||62°F|
Wind History for Fort Pulaski, GA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Statesboro, Statesboro-Bulloch County Airport, GA||6 mi||40 min||E 3||10.00 mi||Overcast||59°F||0°F||%||1009.1 hPa|
|Claxton Evans County Airport, GA||16 mi||40 min||NE 5||10.00 mi||Overcast||60°F||59°F||96%||1008.8 hPa|
|Sylvania, Plantation Airpark, GA||19 mi||40 min||ESE 5||7.00 mi||Light Drizzle||58°F||57°F||100%||1009.8 hPa|
Wind History from TBR (wind in knots)
|1 day ago||Calm||Calm||Calm||SW||SW||W||W||SW|
|2 days ago||W||W||W||NW||W|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Purrysburg Landing |
Click for Map
Mon -- 07:29 AM EDT Sunrise
Mon -- 07:53 AM EDT -0.22 feet Low Tide
Mon -- 08:58 AM EDT Moonrise
Mon -- 12:15 PM EDT 3.07 feet High Tide
Mon -- 07:35 PM EDT Sunset
Mon -- 08:13 PM EDT -0.27 feet Low Tide
Mon -- 09:51 PM EDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|S.C.L. RR. bridge |
Click for Map
Mon -- 07:24 AM EDT -0.44 feet Low Tide
Mon -- 07:29 AM EDT Sunrise
Mon -- 08:58 AM EDT Moonrise
Mon -- 11:51 AM EDT 6.39 feet High Tide
Mon -- 07:35 PM EDT Sunset
Mon -- 07:44 PM EDT -0.55 feet Low Tide
Mon -- 09:51 PM EDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES Local Image of Southeast EDIT
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Wind Forecast for Charleston, SC (6,6,7,8)(on/off)  Help
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