Saturday, July22, 2017 L-36.com


Marine Weather and Tides
Summerville, SC

Version 3.4
What's New / NOTES
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.
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 6:26AMSunset 8:27PM Saturday July 22, 2017 6:51 AM EDT (10:51 UTC) Moonrise 4:34AMMoonset 6:51PM Illumination 2% Phase: Waning Crescent; Moon at 28 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- 345 Am Edt Sat Jul 22 2017
Today..SW winds 5 kt, increasing to 10 to 15 kt late this morning and afternoon.
Tonight..SW winds 10 to 15 kt, decreasing to 5 to 10 kt late.
Sun..SW winds 10 kt. A slight chance of tstms. A slight chance of showers.
Sun night..SW winds 5 to 10 kt. A slight chance of showers and tstms.
Mon..SW winds 10 to 15 kt. A chance of tstms. A chance of showers.
Mon night..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. A chance of showers and tstms.
Tue..SW winds 5 to 10 kt. A chance of showers and tstms.
Tue night..S winds 5 to 10 kt. A chance of showers and tstms.
Wed..S winds around 5 kt. A chance of showers and tstms.
Wed night..S winds 5 kt. A chance of showers and tstms. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 86 degrees.
AMZ300 345 Am Edt Sat Jul 22 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will extend west into the southeast coast through this weekend while a surface trough remains inland. A weak cold front will approach the area during the middle of next week. Low pressure should then develop over the area and linger through late week.

7 Day Forecast for Marine Location Near Summerville, SC
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location: 32.96, -80.2     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 220846
afdchs
area forecast discussion
national weather service charleston sc
446 am edt Sat jul 22 2017

Synopsis
Atlantic high pressure will extend west into the southeast coast
through this weekend while a surface trough remains inland. A weak
cold front will approach the area during the middle of next week.

Low pressure should then develop over the area and linger through
late week.

Near term through tonight
Pre-dawn: dry and clear conditions across the forecast area in ga
and southern sc early this morning. There may be a bit of patchy fog
across far inland southeast ga where temps have been running cooler
in the lower 70s but it does not look significant enough for any
grid forecast inclusions.

Today: a broad mid level weakness will extend along the lower gulf
coast to northern florida while deep subtropical ridges remain
anchored over the atlantic and from the carolinas west into the
southern plains. Sunny skies early on, will result in temps
rising into the lower 90s by early afternoon. Across southeast
and coastal sc, we think substantial upper ridging and very dry
air between 500 mb and 250 mb should be enough to keep diurnal
convection isolated at best and across several zones including
charleston, we decided on silent pops today even though a spotty
and brief shower TSTM is certainly possible.

Over south ga, a weak mid level vort is noted close to the florida
state line and moisture is certainly deeper not far to the south
of our forecast area. Many models suggest an active gulf coast
sea breeze this afternoon and 700 mb flow turns southwest with
time. Some of this late day convection to the south of the
altamaha could send out some late day mesoscale boundaries that
bisect the far south ga sea breeze. This may result in isolated
to locally scattered showers and storms close to the altamaha
region. We have a small area of late day low-end chance pops in
our far southern ga zones, otherwise we maintained slight chance
pops in southeast ga.

Hot and humid weather, typical for this time of year will persist.

Highs will reach the mid 90s with perhaps a few upper 90s adjacent
to the csra and southeast midlands. Forecast heat indices reach
the 105-107 degree range later today but windows of any
potentially higher indices appears very small in areal extent.

Tonight: if any early evening convection lingers over southeast
ga, it should diminish rather quickly prior to 03z. Otherwise,
skies will be mostly clear to partly cloudy. Lows will be in
the mid 70s most areas. Beaches will remain around 80.

Short term Sunday through Tuesday
Sunday: high pressure will gradually retreat over the western
atlantic while lee troughing develops over the midlands early week.

Guidance suggests that weak mid-lvl energy will pass just off the
southeast coast, perhaps spawning showers and thunderstorms near the
beaches. However, additional precip activity should develop inland
where MAX temps approach the mid 90s near the vicinity of the lee
trough. Chances of showers thunderstorms remain in the forecast
during mid afternoon evening hours. Activity should diminish within
a few hours of sunset, but an isolated shower or thunderstorm can
not be ruled out overnight. Low temps should range in the mid 70s.

Monday and Tuesday: a southwest flow will advect deep moisture over
the southeast united states well ahead of a cold front approaching
from the north northwest mid week. Fairly unstable conditions will
develop each afternoon, even as cloud cover expands over the region.

Pwats around 2.25 inches along with MAX temps in the lower 90s
support chances of showers and thunderstorms each afternoon, with
greater precip coverage anticipated on Tuesday as mid-lvl energy
shifts over the southeast while a sfc trough persists inland.

Overnight lows will remain mild under some clouds, generally ranging
in the mid 70s.

Long term Tuesday night through Friday
An unsettled weather pattern will persist through mid week while
southwest flow advects deep moisture to the region ahead of a cold
front approaching from the north northwest. The cold front should
struggle to push south into the region, likely stalling just north
of the area as its parent mid upper lvl trough of low pressure
shifts off the northeast coast. However, weak low pressure should
develop near the stalled boundary on Wednesday and persist through
late week until a second mid upper lvl trough shifts over the
northeast and gradually amplifies, forcing some mid-lvl energy over
the mid atlantic and southeast states late week. The pattern
suggests at least chances of showers and thunderstorms each day with
greatest coverage occurring during peak diurnal heating hours. Temps
will generally peak around normal mid week, but could approach the
mid 90s by the upcoming weekend. Overnight lows will range in the
mid 70s.

Aviation 08z Saturday through Wednesday
Vfr at ksav kchs through 06z Sunday. Isolated late day showers
and tstms are possible along the southeast ga sea breeze
corridor.

Extended aviation outlook: afternoon showers thunderstorms could
provide brief flight restrictions each day. However, greatest
chances of flight restrictions should occur on Wednesday as a cold
front stalls just north of the area. Otherwise,VFR conditions will
prevail.

Marine
The pressure gradient is slowly strengthening between the high
pressure centered south of bermuda and a better defined piedmont
surface trough well inland. Southwest to south flow is expected
to increase to a solid 15 kt later this afternoon and continue
tonight, before decreasing toward daybreak. Seas will increase
from 2 to 3 ft to 3-4 ft as winds build.

Sunday through Thursday: high pressure will prevail over the waters
early next week while a trough of low pressure develops inland. A
cold front will then stall just north of the area during the middle
of next week before weak low pressure slides closer to the coast. In
general, winds seas are expected to remain below small craft
advisory levels through the period. However, we could see southwest
winds gusting around 20 kts Sunday and Monday while the pressure
gradient is somewhat enhanced over coastal waters. The gradient
should then relax as low pressure gradually shifts near the
southeast coast mid week. Seas will generally range between 2-4 ft,
with the exception of some 5 feet seas near 20 nm away from the
south carolina coast Sunday night and Monday night.

Tides coastal flooding
Elevated tide levels due to the lunar perigee and new moon will
result in the possibility for minor coastal flooding during the
evening high tides this weekend into early next week, especially
along the sc coast. This evening's chances for shallow coastal
flooding look decent (similar to yesterday) and coastal flood
advisories may be required later today.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term... Dpb
long term... Dpb
aviation... Dpb
marine... Dpb
tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 19 mi51 min SSW 1.9 G 6 80°F 86°F1016.1 hPa (+0.0)
FBIS1 - Folly Island, SC 25 mi51 min SSW 12 G 14 82°F 1016.5 hPa (+0.0)76°F
ACXS1 - ACE Basin Reserve, SC 31 mi66 min Calm 78°F 1016 hPa77°F
41029 - Capers Nearshore (CAP 2) 32 mi43 min SW 9.7 G 16 79°F 83°F1015.7 hPa
41033 48 mi43 min W 9.7 G 12 81°F 84°F1015.7 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Summerville Airport, SC8 mi56 minN 05.00 miFog/Mist73°F73°F100%1016.6 hPa
Charleston, Charleston Air Force Base, SC10 mi55 minN 010.00 miFair76°F73°F94%1015.9 hPa
Moncks Corner Berkeley County, SC18 mi76 minN 04.00 miFog/Mist73°F71°F94%1015.9 hPa
Charleston Executive Airport, SC21 mi56 minN 010.00 miFair79°F77°F94%1015.9 hPa
Mount Pleasant Regional-Faison Field, SC23 mi56 minN 010.00 miFair75°F75°F100%1015.9 hPa
Walterboro Lowcountry Regional Airport, SC24 mi56 minN 010.00 miFair73°F71°F94%1016.6 hPa

Wind History from DYB (wind in knots)
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Last 24hrCalmS3SW3CalmS4CalmS4S3CalmS4S6S5S6S3CalmS3CalmCalmCalmS3CalmS3CalmCalm
1 day agoCalmCalmCalmW3W4CalmCalmS3CalmCalmS4S4S5S3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmW3CalmCalmCalmCalmSW4SW3NW5E4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
Click for Map
Sat -- 05:16 AM EDT     -0.06 feet Low Tide
Sat -- 05:35 AM EDT     Moonrise
Sat -- 06:27 AM EDT     Sunrise
Sat -- 10:15 AM EDT     2.12 feet High Tide
Sat -- 05:20 PM EDT     -0.16 feet Low Tide
Sat -- 07:51 PM EDT     Moonset
Sat -- 08:26 PM EDT     Sunset
Sat -- 10:47 PM EDT     2.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.21.71.10.60.2-00.10.61.31.92.12.11.91.510.50.1-0.1-00.51.42.12.52.6

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sat -- 02:12 AM EDT     0.00 knots Slack
Sat -- 04:20 AM EDT     1.69 knots Max Flood
Sat -- 05:34 AM EDT     Moonrise
Sat -- 06:26 AM EDT     Sunrise
Sat -- 08:06 AM EDT     -0.00 knots Slack
Sat -- 11:21 AM EDT     -2.88 knots Max Ebb
Sat -- 02:16 PM EDT     0.00 knots Slack
Sat -- 04:46 PM EDT     2.20 knots Max Flood
Sat -- 07:49 PM EDT     Moonset
Sat -- 08:24 PM EDT     Sunset
Sat -- 08:47 PM EDT     -0.00 knots Slack
Sat -- 11:57 PM EDT     -3.29 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.8-1.7-0.311.71.61.310.1-1-2.1-2.8-2.7-1.7-0.4122.221.70.9-0.3-1.7-2.8

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 (6,6,7,8)
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Ground Weather Radar Station Charleston, SC
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weather_mapweather_map weather_map

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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.