Friday, June23, 2017 L-36.com


Marine Weather and Tides
Mount Pleasant, SC

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:11AMSunset 8:32PM Friday June 23, 2017 9:55 AM EDT (13:55 UTC) Moonrise 4:49AMMoonset 7:07PM Illumination 0% Phase: New Moon; Moon at 29 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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AMZ330 Charleston Harbor- 949 Am Edt Fri Jun 23 2017
Rest of today..SW winds 10 to 15 kt with gusts to 20 kt, becoming S 15 to 20 kt this afternoon. Waves building to 1 to 2 ft.
Tonight..S winds 15 kt, except 15 to 20 kt near the harbor entrance. Waves building 1 to 2 ft near the harbor entrance.
Sat..SW winds 15 kt. A slight chance of showers and tstms in the afternoon.
Sat night..SW winds 15 kt. A chance of showers and tstms.
Sun..SW winds 5 to 10 kt. Showers and tstms likely.
Sun night..W winds 5 kt. Showers and tstms likely.
Mon..NE winds 5 kt. A chance of showers and tstms.
Mon night..S winds 5 kt. A chance of showers and tstms.
Tue..N winds 5 kt. A chance of showers and tstms.
Tue night..NE 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 83 degrees.
AMZ300 949 Am Edt Fri Jun 23 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will concede to a cold front, which will move through the area late Sunday. As the front slowly creeps offshore, building high pressure is expected to bring drier conditions for mid to late next week.

7 Day Forecast for Marine Location Near Mount Pleasant, SC
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location: 32.93, -79.83     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 231020
afdchs
area forecast discussion
national weather service charleston sc
620 am edt Fri jun 23 2017

Synopsis
Atlantic high pressure will concede to a cold front, which will move
through the area late Sunday. As the front slowly creeps offshore,
building high pressure is expected to bring drier conditions for mid
to late next week.

Near term until 6 pm this evening
No major changes were made with the sunrise update.

The region will remain along the western periphery of subtropical
high pressure today. Modified forecast soundings yield moderate
instability for late june featuring SBCAPE 2500-3000 j kg, li's
-5 to -7c and si's 0 to -1c, but warm mid-level lapse rates
owing to subtropical ridging and an extensive low mid-level
dry pocket will limit convection to the isolated to perhaps
low-end scattered categories this afternoon along ahead of the
sea breeze. Pops will be limited to 20-30% inland with dry
conditions at the beaches. There will be a risk for localized
damaging winds with the stronger storms as dcape is forecast to
rise to near 1000 j kg, but the lack of any meaningful 0-6km
bulk shear will support a mainly pulse severe convective mode.

Temperatures are poised to warm quickly after daybreak with
highs expected to reach the lower 90s inland while a persistent
onshore flow will limit highs to the mid-upper 80s at the
coast. Dewpoints in the mid 70s will yield heat indices of
100-103 for several hours away from the beaches which is just
sky of the pre-july 1st heat advisory criteria of 105.

Short term 6 pm this evening through Monday
Tonight: diurnal convection should quickly dissipate after
sunset with dry conditions prevailing overnight. It will be a
warm and humid night as nocturnal jetting will keep the
boundary layer fairly well mixed, especially at the coast where
breezy conditions will be found at times. Lows will only drop
into the mid 70s well inland while coastal areas should only
drop into the lower 80s. Would not be at all surprised if a few
coastal locations such as tybee island, folly beach and downtown
charleston only cool off into the 82-84 degree range. The
record high minimums for 24 june could be challenged at all
three climate sites. Mainly clear skies are expected prevail
once high-level debris cloudiness gradually dissipates, but some
marine-based stratocumulus could move inland from off the
atlantic as the low-level flow strengthens, especially along the
lower south carolina coast where the orientation of the coast
is the most favorable for inland penetration.

Saturday through Monday: the short term forecast starts out
with atlantic high pressure to our east and a cold front slowly
approaching from the west. SE flow around these features will
pump plenty of moisture into our area ahead of the front. Pops
ramp up Saturday into Saturday night from inland locations to
the coast as the front gets closer to our area. By Sunday deep
moisture will be in place. Pwats should exceed 2.25", which very
high for this time of year. Additionally, there will be
increasing instability and shear. This will support showers and
thunderstorms across our area. Some of the storms could be
severe, with damaging winds being the main threat. The front is
forecasted to move through Sunday night or Monday morning, then
linger just offshore the rest of Monday afternoon. The risk of
showers storms will be lower far inland, gradually increasing as
one gets to the coast, closer to the front.

Long term Monday night through Thursday
Monday night the cold front will be offshore of our area, dissipating
as it moves further away. Meanwhile, high pressure from the
central u.S. Will gradually be building towards our area. The
high is expected to pass north of our area Wednesday, then move
offshore Thursday. Dry conditions are expected for most of the
land area. The only shower threat appears to be over the coastal
waters each night and maybe along portions of the immediate
coast. Temperatures will be slightly below normal through
Wednesday, then creeping up on Thursday.

Aviation 12z Friday through Tuesday
Vfr. High resolution guidance suggests isolated scattered
showers tstms will likely cluster west of the kchs-ksav corridor
this afternoon. It could be close at ksav, but with
probabilities generally limited to 20-30%, no mention of vcts or
tsra will be included at either terminal for the 12z TAF cycle.

Extended aviation outlook: periods of flight restrictions are
expected late Saturday into Monday due to a cold front slowly moving
through the area.

Marine
Today: southerly winds will persist today as atlantic high
pressure holds firm well offshore. South winds around 15 kt will
prevail for much of the day, but will begin to increase later
this afternoon as the low-level jetting begins to take hold.

Could see gusts approaching 20 kt in the charleston harbor for a
few hours this afternoon as the sea breeze moves inland, but
think conditions there will hold just below small craft advisory
thresholds. This will have to be watched carefully. Thankfully,
the tide will be coming in when winds will be at their highest
so counterflow conditions are not expected. Seas will average
3-4 ft.

Tonight: nocturnal jetting is forecast strengthen overnight as
atlantic high pressure buckles a bit after midnight. Nocturnal
jetting looks strongest over the charleston county waters were
speeds will reach 20 kt at times with gusts 25-30 kt. Elsewhere
winds look to average 15-20 kt. Seas will also build in the
southerly flow, reaching 4-6 ft over the charleston county
waters with 4-5 ft elsewhere. Will hoist a small craft advisory
for the charleston county waters beginning late this evening.

Conditions will be close to advisory thresholds elsewhere,
especially the charleston harbor and georgia offshore legs, but
will let the day crew decide if a small craft advisory is needed
after the 12z guidance is received.

Saturday through Tuesday: atlantic high pressure will remain east of
the waters this weekend as a cold front approaches the area. The
front is expected to move through Sunday night, then slowly move
offshore on Monday. Winds will be elevated into Sunday, ahead of the
front. It's borderline whether gusts will reach advisory criteria,
but the elevated winds should produce 6 foot seas beyond 10 nm for
the charleston waters. As a result, a small craft advisory is in
effect through Saturday night. This is highly dependent on the wind
speeds and the end time may need to be adjusted. Furthermore, if
winds are stronger than expected, advisories may need to be expanded
to the remaining zones due to gusts and seas. Following the frontal
passage early next week, conditions will improve as high pressure
builds into the area.

Rip currents: the combination of breezy conditions in the surf
zone and influences from the new moon, lunar perigee and ongoing
elevated tides will support a moderate risk for rip currents at
all beaches today. Thankfully, there does not appear to be much
of a swell component which would likely bump the risk into the
high category. An elevated risk for rip currents will continue
through the weekend.

Tides coastal flooding
A coastal flood advisory may be needed for portions of the lower
south carolina coast during the evening high tide cycle.

Tides will be running high given the increased astronomical
influences and onshore winds could help push levels high enough
to produce shallow coastal flooding around the times of the
evening high tide through the weekend, especially along the
south carolina coast.

Climate
Record high minimums for 24 june:
kchs 79 2016.

Kcxm 85 1998.

Ksav 79 1932.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory from 11 pm this evening to 2 am edt
Sunday for amz350.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 11 mi38 min SSW 8.9 G 14 83°F 83°F1018 hPa
41029 - Capers Nearshore (CAP 2) 14 mi48 min SW 18 G 21 86°F 82°F1017.6 hPa
FBIS1 - Folly Island, SC 17 mi56 min SSW 16 G 18 81°F 1018.6 hPa (+0.7)75°F
ACXS1 - ACE Basin Reserve, SC 42 mi71 min Calm 83°F 1018 hPa77°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 45 mi71 min SW 8 81°F 1017 hPa76°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 49 mi26 min SW 14 G 18 81°F 81°F1018.1 hPa76°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC3 mi81 minSSW 98.00 miA Few Clouds82°F75°F79%1017.9 hPa
Charleston, Charleston Air Force Base, SC11 mi2 hrsS 710.00 miMostly Cloudy79°F75°F88%1017.2 hPa
Charleston Executive Airport, SC18 mi61 minSSW 910.00 miOvercast82°F77°F84%1017.9 hPa
Moncks Corner Berkeley County, SC21 mi61 minSW 810.00 miFair77°F77°F100%1017.6 hPa

Wind History from LRO (wind in knots)
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Last 24hrS6S7SW6SW8S8S9S8S8S4CalmS6S5CalmS7S6S7S7S6S6S5SW4S4S7S11
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1 day agoN5CalmCalmCalmCalmCalmCalmE3CalmCalmCalmCalmCalmCalmCalmCalmS4CalmCalmCalmCalmCalmCalmS8
2 days agoSW3CalmCalmS6S7CalmCalmCalmNW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Cainhoy, Wando River, South Carolina
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Cainhoy
Click for Map
Fri -- 02:27 AM EDT     -0.40 feet Low Tide
Fri -- 05:49 AM EDT     Moonrise
Fri -- 06:11 AM EDT     Sunrise
Fri -- 08:44 AM EDT     6.28 feet High Tide
Fri -- 02:34 PM EDT     -0.95 feet Low Tide
Fri -- 08:06 PM EDT     Moonset
Fri -- 08:31 PM EDT     Sunset
Fri -- 09:15 PM EDT     8.04 feet High Tide
Fri -- 10:32 PM EDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.60.8-0.3-0.20.82.33.95.26.16.35.54.12.20.5-0.7-0.80.224.167.487.76.5

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Fri -- 02:29 AM EDT     0.00 knots Slack
Fri -- 04:40 AM EDT     1.84 knots Max Flood
Fri -- 05:50 AM EDT     Moonrise
Fri -- 06:12 AM EDT     Sunrise
Fri -- 08:23 AM EDT     -0.00 knots Slack
Fri -- 11:38 AM EDT     -2.95 knots Max Ebb
Fri -- 02:31 PM EDT     0.01 knots Slack
Fri -- 05:05 PM EDT     2.37 knots Max Flood
Fri -- 08:06 PM EDT     Moonset
Fri -- 08:31 PM EDT     Sunset
Fri -- 09:03 PM EDT     -0.00 knots Slack
Fri -- 10:32 PM EDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-3.1-2.1-0.70.71.71.81.51.10.4-0.7-1.9-2.8-2.9-2.1-0.80.71.92.42.21.81.20.1-1.4-2.7

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for Charleston, SC (9,2,3,4)
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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.