Monday, March18, 2019 L-36.com


Marine Weather and Tides
Hilton Head Island, SC

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:28AMSunset 7:34PM Monday March 18, 2019 9:27 PM EDT (01:27 UTC) Moonrise 4:02PMMoonset 4:57AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 640 Pm Edt Mon Mar 18 2019
.small craft advisory in effect from midnight edt tonight through Wednesday afternoon...
Tonight..SE winds 5 to 10 kt, becoming becoming N 15 to 20 kt with gusts to 25 kt after midnight, becoming ne 20 to 25 kt with gusts to 30 kt late. Seas 2 to 3 ft, building to 3 to 5 ft after midnight.
Tue..NE winds 20 to 25 kt. Seas 4 to 6 ft.
Tue night..NE winds 20 kt with gusts to 25 kt. Seas 4 to 6 ft.
Wed..NE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 6 ft.
Wed night..N winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight.
Thu..NW winds 10 kt. Seas 3 to 4 ft.
Thu night..NW winds 10 to 15 kt. Seas 3 to 4 ft.
Fri..N winds 10 to 15 kt. Seas 2 to 3 ft.
Fri night..N winds 5 to 10 kt. Seas 2 ft.
Sat..NE winds 5 to 10 kt. Seas 2 to 3 ft.
Sat night..SE winds 5 to 10 kt. Seas 2 ft.
AMZ300 640 Pm Edt Mon Mar 18 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A dry cold front will move through tonight, followed by high pressure. A trough will develop offshore Wednesday then move northeast away from the area. High pressure will then prevail through early next week.


7 Day Forecast for Marine Location Near Hilton Head Island, SC
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location: 32.22, -80.77     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 182316
afdchs
area forecast discussion
national weather service charleston sc
716 pm edt Mon mar 18 2019

Synopsis
A dry cold front will move through tonight, followed by high
pressure. A trough will develop offshore Wednesday then move
northeast away from the area. High pressure will then prevail
through early next week.

Near term until 6 am Tuesday morning
The dry cold front will push into the ocean this evening,
allowing for stronger high pressure to build out of the
allegheny plateau region of ohio and west virginia. A steady
supply of colder air will filter in through the night, allowing
for the h85 0c isotherm to penetrate to near the northern tier
of the cwfa by daybreak. The cold advection will be offset
somewhat by varying amounts and thickness of cirriform clouds
due to the upper jet that moves through the area. Due to these
clouds we have raised cloud cover by some 20-40% early tonight
from previously. There is too much mixing for any frost,
although lows will get down to the upper 30s and lower 40s most
communities inland from us-17 and the mid and upper 40s on the
barrier islands and in downtown charleston and downtown
savannah.

Lake winds: as colder air moves across lake moultrie through
the night, and steady isallobaric pressure rises develop, better
mixing will develop. We have raised winds to a solid 15-20 kt
during the late evening and overnight in anticipation of this,
and we'll need to carefully watch for the need of a lake wind
advisory if winds get any stronger.

Previous discussion...

quiet and dry conditions will continue tonight. A dry cold front
will move through the area this evening, with strong high
pressure to build in its wake. There will be periods of high
clouds overnight, however lows will still be able to drop to
around 40 inland, mid 40s at the immediate coast. Temperatures
and winds should remain too high to support any frost
development.

Short term 6 am Tuesday morning through Thursday
Cool and dry high pressure will persist north of the area
Tuesday into Wednesday, keeping highs in the low to mid 60s and
lows in the upper 30s to lower 40s. Mostly clear skies are
expected aside from possible stratocu on Wednesday as a weak
coastal trough develops off the sc coast.

A considerable warm-up is in store for Thursday as the cold air
advection diminishes and a moderate downslope flow sets up. High
temps will climb into the lower 70s.

Long term Thursday night through Monday
A rather quiet weather pattern is expected. Strong continental high
pressure will prevail across the region through the weekend. Models
then hint at a system approaching from the west late Sunday.

Aviation 00z Tuesday through Saturday
Vfr through 00z Wednesday. N-ne winds will increase behind a
cold front overnight and continue gusty at times through much of
Tuesday S strong high pressure builds into the area.

Extended aviation:VFR.

Marine
The surface pressure gradient will tighten tonight as high
pressure builds into the area. This will lead to elevated N ne
winds. Small craft advisories will go into effect at midnight
for all waters with the exception of the charleston harbor.

Wind gusts in the harbor will get close to advisory criteria
late (around 09z), but it looks marginal at this time. Will
continue to evaluate with future forecast issuances. Seas 2-4
feet this evening will build to 4-6 feet by daybreak for the
nearshore waters, 5-7 ft in the offshore zone.

A rather persistent strong northeast gradient is expected
Tuesday into Wednesday as high pressure remains north of the
waters. Small craft advisories expected to continue into at
least Wednesday for all waters outside charleston harbor.

Lingering 6 ft or greater seas will keep the charleston
nearshore waters in advisory territory through Wednesday evening
and the offshore ga waters through Thursday afternoon.

A period of moderate offshore winds is then expected Thursday
into Friday as high pressure builds from the west. At this point
it appears winds seas will remain below advisory levels except
for the aforementioned SCA for the offshore ga waters.

Tides coastal flooding
The combination of the perigee and full moon midweek along with
moderate to strong northeast winds Tuesday through Wednesday
will result in elevated tides. Coastal flood advisories for
minor or maybe moderate flooding are likely with each high tide
Tuesday, Wednesday, and maybe Thursday if the anomalies linger.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory from midnight tonight to 6 pm edt
Wednesday for amz352-354.

Small craft advisory from midnight tonight to 9 pm edt
Thursday for amz374.

Small craft advisory from midnight tonight to midnight edt
Wednesday night for amz350.

Near term...

short term... Jrl
long term...

aviation...

marine...

tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 15 mi45 min SSW 1.9 G 4.1 59°F 62°F1022.1 hPa
41033 20 mi79 min S 7.8 G 9.7 60°F 61°F1020.9 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi102 min S 1 59°F 1021 hPa41°F
FBIS1 - Folly Island, SC 57 mi87 min S 4.1 G 4.1 59°F 1021.9 hPa (+1.5)40°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilton Head Island, Hilton Head Airport, SC4 mi32 minN 010.00 miFair57°F37°F48%1022.3 hPa
Beaufort County Airport, SC15 mi32 minN 07.00 miFair57°F39°F51%1022 hPa
Beaufort, Marine Corps Air Station, SC18 mi31 minS 310.00 miPartly Cloudy60°F42°F52%1022.1 hPa
Savannah-Hilton Head International Airport, GA23 mi34 minS 310.00 miOvercast59°F37°F44%1022.1 hPa
Hunter U. S. Army Airfield, GA24 mi31 minN 010.00 miFair57°F38°F51%1021.6 hPa

Wind History from HXD (wind in knots)
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Last 24hrNE53CalmCalmCalmCalmCalmCalmN4N5N5N7N9N8--N7E6
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S6S6S6S3Calm
1 day agoN8N6N7NE6NE7NE7NE6NE7N8N10N10N8N8N10N10N10N7N8N6N4N3CalmCalmN4
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N6N6N6N4N4CalmCalmNE7

Tide / Current Tables for Skull Creek, south entrance, Hilton Head Island, South Carolina
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Skull Creek
Click for Map
Mon -- 12:43 AM EDT     -0.65 feet Low Tide
Mon -- 05:56 AM EDT     Moonset
Mon -- 06:58 AM EDT     8.40 feet High Tide
Mon -- 07:29 AM EDT     Sunrise
Mon -- 01:20 PM EDT     -0.49 feet Low Tide
Mon -- 05:01 PM EDT     Moonrise
Mon -- 07:31 PM EDT     7.89 feet High Tide
Mon -- 07:33 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.3-0.60.42.24.56.57.98.47.96.54.72.60.7-0.4-0.21.135.16.87.87.86.85.23

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Mon -- 01:19 AM EDT     0.00 knots Slack
Mon -- 04:03 AM EDT     2.41 knots Max Flood
Mon -- 05:56 AM EDT     Moonset
Mon -- 07:30 AM EDT     Sunrise
Mon -- 07:50 AM EDT     -0.00 knots Slack
Mon -- 11:17 AM EDT     -2.30 knots Max Ebb
Mon -- 02:03 PM EDT     0.01 knots Slack
Mon -- 04:34 PM EDT     1.96 knots Max Flood
Mon -- 05:02 PM EDT     Moonrise
Mon -- 07:33 PM EDT     Sunset
Mon -- 08:14 PM EDT     -0.00 knots Slack
Mon -- 11:39 PM EDT     -2.26 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.5-0.4122.42.21.70.9-0.2-1.3-2-2.3-2.2-1.4-0.11.21.91.91.61.10.3-0.9-1.7-2.2

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Southeast    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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Wind Forecast for Charleston, SC (21,6,7,8)
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Ground Weather Radar Station Charleston, SC
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Disclaimer:
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.