Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
James, 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 6:57AMSunset 6:10PM Wednesday February 20, 2019 11:20 AM EST (16:20 UTC) Moonrise 7:33PMMoonset 7:51AM Illumination 99% 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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AMZ256 Coastal Waters From Murrells Inlet To South Santee River Sc Out 20 Nm- 940 Am Est Wed Feb 20 2019
.small craft advisory in effect until 9 pm est this evening...
Rest of today..E winds 15 to 20 kt, becoming se 10 to 15 kt early this afternoon, then becoming S 10 kt late. Seas 5 to 7 ft. Periods of rain late this morning and early afternoon, then a chance of rain late. Vsby 1 to 3 nm, decreasing to 1 nm or less this afternoon.
Tonight..SW winds 10 kt. Seas 4 to 6 ft. A chance of showers, mainly in the evening. Patchy fog late.
Thu..SW winds 10 to 15 kt. Seas 4 to 5 ft. Areas of fog. A slight chance of showers.
Thu night..W winds 10 kt. Seas 3 to 4 ft. Areas of fog in the evening. A chance of showers.
Fri..NE winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Seas 3 to 4 ft, building to 4 to 6 ft in the afternoon. A chance of showers.
Fri night..NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 4 to 6 ft. A chance of showers.
Sat..E winds 10 to 15 kt, becoming sw. Seas 3 to 4 ft. A chance of showers through the day.
Sun..SW winds 15 to 20 kt, becoming w. Seas 4 to 5 ft. A chance of showers through the day.
AMZ200 940 Am Est Wed Feb 20 2019
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. A coastal front just offshore will track toward the coast, pushing onshore tonight and further inland before dissipating during Thu. A cold front dropping southward late Thu will stall across or just south of the forecast area Fri and Sat. Sun will see this front return north as a warm front, pushing across the area early in the day. The next cold front will arrive from the west Sun night.


7 Day Forecast for Marine Location Near James, SC
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location: 33.31, -79.68     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 201553
afdchs
area forecast discussion
national weather service charleston sc
1053 am est Wed feb 20 2019

Synopsis
A nearly stationary front will meander near the area through
Saturday morning. A cold front will sweep through from the west
late Sunday, followed by high pressure on Monday. A low
pressure system could affect the area next Tuesday.

Near term through tonight
Several changes were made with this update.

Pops weather: radar indicates scattered to numerous showers
generally across our sc counties this morning, moving to the
nne. We adjusted the hourly grids to try to better capture it's
movement and the drier conditions to the south and west of it.

Temperatures dew points: observations are fairly close to what's
in the forecast. Models indicate temperatures really increasing
this afternoon, especially across southeast ga. The concern is
the warm front will be slower to move onshore and erode the cold
air, especially with low ceilings sticking around most places.

So it's possible the highs may be overdone. But we won't rush to
make any changes, instead waiting to see the hourly observation
trends.

Tonight: the warm front will completely lift north of the
forecast area as a cold front slides east off the southern
appalachians. Winds across the CWA is forecast to shift from the
south late this evening and will remain through tonight. Sfc
dewpoints are expected to warm into the low 60s by midnight.

Near shore buoys indicate that water temperatures remain in the
mid 50s. Warm and moisture return flow across the cooler shelf
waters will favor the development of sea fog, building over the
coast with time. At this time, it is uncertain if the fog will
become widespread and dense or remain patchy dense. Low
temperatures around 60 will be common tonight.

Short term Thursday through Saturday
The area should be solidly in the warm-sector on Thursday with
the front to the north. We may see some brief, partial clearing
during the daytime hours. Temps soaring into the upper 70s to
lower 80s and dewpoints in the low to mid 60s will produce
modest surface-based instability. We held onto a slight chance
of showers given weak upper shortwave energy propagating through
the area.

Thursday night the front to our north will begin shifting south,
potentially moving into our far northern zones close to daybreak
Friday. Isentropic ascent will gradually increase overnight with
scattered showers possible, mainly inland. Conditions look ripe
for areas of fog to develop along and south of the front.

The backdoor cold front will drop south to near the savannah
river on Friday, allowing northeast flow to redevelop over
southern sc. Isentropic ascent will strengthen from north to
south during the day, likely producing scattered showers mainly
over southern sc, highest coverage inland. High temps will range
from lower 60s far north to lower 80s far south.

The stalled front will remain across the area through Friday
night, then slowly move north on Saturday. Rain chances will
gradually dwindle during this period. Highs on Saturday will be
in the mid to upper 70s in most locations.

Long term Saturday night through Tuesday
A potent cold front will sweep through the area Sunday afternoon
though only scattered showers are expected to accompany it.

Strong warm air advection ahead of the front will produce high
temps in the upper 70s on Sunday. Somewhat cooler weather is in
store for Monday through Wednesday as a series of high pressure
areas move into the area. A gulf low pressure system could bring
some rain to the area Tuesday and Tuesday night.

Aviation 16z Wednesday through Sunday
A coastal trough will drift slowly onshore during the daylight
hours, becoming a warm front. Ifr to maybe brief MVFR ceilings
and periods of light rain are expected through this afternoon.

The warm front is forecast to slide west of the terminals by
this evening. Flow will shift from the south and sea fog is
expected to develop across the shelf waters, then advect onshore
impacting the terminals as ifr ceilings and possibly ifr
visibility.

Extended aviation outlook: low ceilings are likely Wednesday
night through Thursday morning. Low ceilings and or reduced
visibility likely Thursday night through Saturday morning.

Marine
Rest of today: ridging high pressure this morning will shift
inland as an trough and warm front slides across the nearshore
waters. Winds will gradually ease and transition to east and
then southeast, first in the ga waters and then in the sc
waters. Small craft advisories remain in effect for the ocean
waters, but they are expected to expire for some of the waters
today as conditions improve.

Tonight: in the wake of the passing warm front, winds will
remain steady from the sw. Sfc dewpoints are expected to warm
into the low 60s by midnight. Near shore buoys indicate that
water temperatures remain in the mid 50s. Warm and moisture
return flow across the cooler shelf waters will favor the
development of sea fog, building over the coast with time. At
this time, it is uncertain if the fog will become widespread and
dense or remain patchy dense. Wave heights of six feet should be
limited to the outer portions of amz350 and 374.

A brief window for small craft advisory conditions will exist
late Friday night over the charleston sc nearshore waters behind
a backdoor cold front. More widespread SCA conditions are
possible Sunday ahead of a cold front.

The more significant concern is the likely development and
persistence of sea fog due to surface dewpoints in the low to
mid 60s moving over the cool shelf waters. The most likely time
frame will be Thursday and Thursday night when low-level flow is
southerly. By midday Friday the winds will be northeast which is
less favorable.

Tides coastal flooding
This evening's high tide is the lower of the two
for the day. The wind direction is forecasted to shift towards the
south and ease, but residual anomalies could allow the tide to
briefly approach minor coastal flooding advisory criteria at
charleston.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until noon est today for amz352-354.

Small craft advisory until 4 pm est Thursday for amz374.

Small craft advisory until midnight est tonight for amz350.

Near term...

short term...

long term... Jrl
aviation...

marine...

tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NIWS1 - North Inlet-Winyah Bay Reserve, SC 26 mi95 min NE 12 54°F 1023 hPa54°F
41029 - Capers Nearshore (CAP 2) 35 mi72 min NE 12 G 14 57°F 56°F1022.4 hPa
CHTS1 39 mi32 min NNW 1.9 G 13
FBIS1 - Folly Island, SC 45 mi80 min N 8 G 8.9 58°F 1022.7 hPa (-0.9)58°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Georgetown County Airport , SC19 mi25 minNNE 65.00 miFog/Mist54°F53°F100%1023.7 hPa
Moncks Corner Berkeley County, SC21 mi25 minN 53.00 miFog/Mist48°F48°F100%1023.7 hPa

Wind History from GGE (wind in knots)
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2 days agoCalmE3NE3CalmNE5CalmCalmCalmE3E3SE3SE6S3S6SW12
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Tide / Current Tables for Jamestown Bridge, Santee River, South Carolina
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Jamestown Bridge
Click for Map
Wed -- 12:22 AM EST     1.27 feet High Tide
Wed -- 06:57 AM EST     Sunrise
Wed -- 07:50 AM EST     Moonset
Wed -- 08:40 AM EST     -0.41 feet Low Tide
Wed -- 12:47 PM EST     1.43 feet High Tide
Wed -- 06:07 PM EST     Sunset
Wed -- 07:32 PM EST     Moonrise
Wed -- 09:12 PM EST     -0.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.31.10.90.60.30-0.2-0.4-0.40.10.81.31.41.31.20.90.60.3-0-0.2-0.3-0.10.4

Tide / Current Tables for Pleasant Hill Landing, Santee River, South Carolina
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Pleasant Hill Landing
Click for Map
Wed -- 06:02 AM EST     -0.96 feet Low Tide
Wed -- 06:56 AM EST     Sunrise
Wed -- 07:49 AM EST     Moonset
Wed -- 10:56 AM EST     2.86 feet High Tide
Wed -- 06:07 PM EST     Sunset
Wed -- 06:34 PM EST     -0.73 feet Low Tide
Wed -- 07:32 PM EST     Moonrise
Wed -- 11:24 PM EST     2.62 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.31.81.10.4-0.3-0.8-1-0.50.51.72.62.92.72.31.710.3-0.3-0.7-0.70.11.122.6

Weather Map and Satellite Images
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GOES 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.
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Wind Forecast for Charleston, SC (11,2,3,4)
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Ground Weather Radar Station Wilmington, NC
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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.