Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Meggett, SC

Version 3.4
What's New / NOTES
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 6:36AMSunset 7:58PM Wednesday April 25, 2018 4:13 AM EDT (08:13 UTC) Moonrise 2:45PMMoonset 3:13AM Illumination 75% 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
    EDIT      (on/off)   Help
AMZ330 Charleston Harbor- 307 Am Edt Wed Apr 25 2018
Today..W winds 5 to 10 kt, becoming sw 10 to 15 kt with gusts to 20 kt this afternoon.
Tonight..W winds 5 to 10 kt.
Thu..N winds 5 kt, becoming S in the afternoon.
Thu night..S winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Fri..SW winds 5 kt, increasing to 10 kt in the afternoon. A chance of showers in the morning.
Fri night..SW winds 5 to 10 kt.
Sat..NW winds 5 kt.
Sat night..NW winds 5 kt.
Sun..NE winds 5 to 10 kt.
Sun night..E winds 5 kt. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 66 degrees.
AMZ300 307 Am Edt Wed Apr 25 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Low pressure will develop across the lower gulf coast today then move north of the region by early Friday, followed by a cold front Friday night. High pressure will then build into the region through Sunday and will prevail through next week.

7 Day Forecast for Marine Location Near Meggett, SC
   Hourly   EDIT   Help
location: 32.7, -80.28     debug


Area Discussion for - Charleston, SC
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus62 kchs 250744
afdchs
area forecast discussion
national weather service charleston sc
344 am edt Wed apr 25 2018

Synopsis
Low pressure will develop across the lower gulf coast tonight
then move north of the region by early Friday, followed by a
cold front Friday night. High pressure will then build into the
region through Sunday and will prevail through next week.

Near term through tonight
Pre-dawn: temps have been slow to fall across the forecast area
overnight as southwest winds have been able to keep the lowest
levels stirred up to this point. Skies have cleared and winds
may tend to weakly decouple inland toward daybreak, thus some
upper 50s are still expected west of the coastal corridor.

Today: low pressure along the mid atlantic coast this morning
is forecast to lift toward southeast new england by early this
evening. Upper level troughing will lose influence over the
carolinas, while deep layered flow over the region becomes more
west-northwest. Mid level subsidence and low level offshore
flow will result in dry weather today with plenty of morning
sunshine warming temps into the mid 70s by midday most areas.

This afternoon, scattered to broken cumulus and stratocu are
expected to develop across south carolina and then flatten out
below a strong subsidence inversion aloft later in the day.

Some of these clouds could result in slight cooler late day
temps across northern zones but the sinking west flow is
expected to allow much of the coastal corridor to reach 80
degrees this afternoon with at least upper 70s well inland. West
winds will average 10-15 mph this afternoon but it should be
locally breezy along the charleston county resultant sea breeze
during the afternoon, especially if skies remain sunnier rather
than cloudier between 2 pm and 6 pm.

Tonight: quiet weather is on tap with most areas under mainly
clear skies. A weak backdoor front may sneak into the sc zones
overnight but have little impact to forecast elements. Lows will
be in the 56-60 degree range most areas.

Short term Thursday through Saturday
Thursday and Thursday night: a vigorous upper trough and associated
surface low pressure will approach the region from the west. Forcing
for ascent should support an area of showers thunderstorms west of
the region Thursday, but guidance suggests that any precipitation
will not arrive in our area before late afternoon, followed by
highest pops during the first half of Thursday night.

While skies will become mostly cloudy Thursday, daytime pops are
limited to slight chance chance inland during the late afternoon.

Near normal high temps in the upper 70s lower 80s are expected away
from the beaches.

The upper trough will open, become negatively tilted and will begin
to lift northeast Thursday night. However, guidance differs
regarding the details timing of the transition of the upper trough
from a closed low to a weaker open wave, and this in turn will
determine whether decent coverage of showers arrives to produce
measurable rainfall at many locations or if upstream convection
tends to fall apart as it approaches the southeast coast. The latest
forecast indicates Thursday evening pops ranging from 40-50 percent
north west to 15-25 percent far south, but adjustments will no doubt
be required within subsequent forecasts. Also, while instability
remains unimpressive, dynamic forcing for ascent within the
warm moist conveyor belt should support eastward translation of
upstream convection, justifying a slight chance of thunderstorms
mainly north west Thursday evening.

Friday: cannot rule out a few showers within a persistent surface-
850 mb trough, especially along the sea breeze during the afternoon.

However, residual moisture appears meager, so rather than blanket
the entire area with slight chance pops opted to hold pops below 15
percent with no explicit mention of precipitation. Even if a couple
of showers manage to develop, most locations will remain rain-free.

Otherwise, expect high temps in the mid upper 70s away from the
beaches.

Friday night and Saturday: another upper trough will quickly advance
east and will push a cold front through the region. Latest guidance
generally agrees that moisture return ahead of these features should
remain off the coast, so slight chance pops are limited to coastal
waters Friday night into Saturday. Otherwise, the cold front will
bring drier air but little change in temps as highs average close to
80f Saturday afternoon.

Long term Saturday night through Tuesday
No rain is expected through at least the middle of next week.

Surface high pressure will build from the north this weekend. Then,
the surface high will shift south over the region as an upper ridge
builds over the region by early next week, and this regime will then
prevail through the week. As the surface high migrates south,
persistent onshore flow will commence later this weekend and will
continue next week. Thus, temperatures will remain close to normal
for late april early may, featuring highs in the upper 70s lower 80s
inland and upper 60s lower 70s on the beaches and lows in the 50s
inland 60s at the coast.

Aviation 07z Wednesday through Sunday
Vfr conditions will prevail at kchs and ksav through 06z Thursday.

Extended aviation outlook: brief flight restrictions possible in
showers Thursday night. Otherwise,VFR through this period.

Marine
A modest surface pressure gradient keeping winds closer to 15 kt
over the coastal waters early this morning. The flow is gradually
veering to a more west component and seas were slowly subsiding
pre-dawn. We lowered the SCA for charleston county waters given
latest trends. Winds later today will be mainly SW with speeds
near 15 kt. Weaker SW to W flow tonight as the gradient slackens.

Seas will range from 4-5 ft near shore charleston waters to 3-4
ft ga waters today. We maintained the SCA for outer ga waters
until mid afternoon but it could be lowered a bit sooner.

Thursday through Monday: winds seas will remain below SCA levels
through this weekend. Low pressure passing inland Thursday night
into Friday and a cold front pushing through the waters Friday
night early Saturday will contribute to changing wind directions.

Seas of 2 to 4 ft Thursday-Friday will subside to 1 to 3 ft for a
time this weekend.

Seas will build in response to increasing east northeast winds as
high pressure builds from the north then shifts south later this
weekend into early next week, and 6 ft seas could push into ga
waters beyond 20 nm by early next week.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until 2 pm edt this afternoon for amz374.

Near term...

short term... Spr
long term... Spr
aviation... Spr
marine... Spr


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 13 mi88 min N 2.9 65°F 58°F
CHTS1 20 mi43 min SW 5.1 G 8 65°F 66°F1009.3 hPa
FBIS1 - Folly Island, SC 21 mi73 min SW 7 G 8.9 64°F 1010 hPa (-1.7)57°F
41033 30 mi65 min WSW 9.7 G 14 66°F 65°F1009.3 hPa
41029 - Capers Nearshore (CAP 2) 35 mi65 min W 9.7 G 14 66°F 64°F1008.9 hPa
FPKG1 - 8670870 - Fort Pulaski, GA 57 mi43 min W 6 G 8 64°F 66°F1010.7 hPa

Wind History for Charleston, SC
(wind in knots)    EDIT      (on/off)   Help
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last
24hr
SW5
SW4
G9
SW4
SW5
G10
S3
G7
S4
G9
S11
S8
G11
S12
S13
G16
S14
S11
G17
S7
G12
S7
G14
S4
G12
SW11
G14
SW7
G13
SW6
G11
SW4
G8
W4
SW4
SW3
G6
SW5
SW4
1 day
ago
E14
G17
E13
G16
E15
E17
E13
G17
NE17
E19
G24
E19
G24
E24
E23
E23
E24
G29
E26
G32
E15
G20
E27
G35
E23
G29
SE20
G27
E14
G19
E14
G17
E17
G21
S14
G17
S9
--
--
2 days
ago
NE9
G12
NE7
G11
NE9
NE8
G11
NE12
G16
E12
E11
E14
E13
E16
E16
E14
G17
NE13
NE12
G17
NE12
G17
NE14
G17
NE16
G20
NE17
G22
NE18
G22
NE20
E15
G19
E14
G17
E13
E14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC15 mi18 minSW 310.00 miMostly Cloudy63°F57°F83%1009.5 hPa
Charleston, Charleston Air Force Base, SC20 mi17 minSW 610.00 miMostly Cloudy62°F55°F80%1009 hPa
Walterboro Lowcountry Regional Airport, SC24 mi18 minWSW 610.00 miFair61°F55°F83%1009.5 hPa

Wind History from JZI (wind in knots)
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last 24hrSW5SW5
G13
SW5
G10
SW7S6S10S8S10S10S12S11S14S12
G17
S12S9
G14
SW11
G18
SW7
G12
SW7
G13
SW6CalmSW6W5SW4SW5
1 day agoE13
G20
E11E9
G15
E15E15
G21
E12
G21
E15
G20
E16
G22
E17
G24
E22
G29
E17
G25
E14
G21
E15
G27
E14
G21
E17
G27
E18
G28
E21
G28
E13
G27
E8SE10
G15
E8SE5
G11
CalmCalm
2 days agoNE7NE8NE7NE7NE7E11E11E12E11E12E14
G20
E11E13
G18
E11E12NE9
G14
NE11E13
G19
NE16E14
G20
E11
G20
E11E10
G16
E11
G18

Tide / Current Tables for Lower Toogoodoo Creek, 2 mi. above entrance, South Carolina
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Lower Toogoodoo Creek
Click for Map
Wed -- 04:12 AM EDT     Moonset
Wed -- 06:25 AM EDT     7.37 feet High Tide
Wed -- 06:40 AM EDT     Sunrise
Wed -- 12:05 PM EDT     0.08 feet Low Tide
Wed -- 03:45 PM EDT     Moonrise
Wed -- 07:04 PM EDT     7.18 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.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.41.22.64.15.56.77.37.26.14.42.50.80.10.41.52.94.45.76.87.26.75.33.41.5

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
   EDIT      (on/off)   Help   One Week of Data
Charleston Harbor Entrance
Click for Map
Wed -- 01:29 AM EDT     1.51 knots Max Flood
Wed -- 04:11 AM EDT     Moonset
Wed -- 05:28 AM EDT     -0.00 knots Slack
Wed -- 06:38 AM EDT     Sunrise
Wed -- 08:43 AM EDT     -2.45 knots Max Ebb
Wed -- 11:50 AM EDT     0.00 knots Slack
Wed -- 02:04 PM EDT     1.46 knots Max Flood
Wed -- 03:43 PM EDT     Moonrise
Wed -- 06:03 PM EDT     -0.00 knots Slack
Wed -- 07:56 PM EDT     Sunset
Wed -- 09:13 PM EDT     -2.48 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.81.41.51.31.10.4-0.5-1.5-2.3-2.4-1.9-10.21.11.51.41.30.90.1-1-1.9-2.5-2.2-1.5

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (4,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Charleston, SC
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.