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 4:52 PM EDT (20:52 UTC) Moonrise 4:34AMMoonset 6:51PM Illumination 1% Phase: Waning Crescent; 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- 307 Pm Edt Sat Jul 22 2017
Tonight..SW winds 10 to 15 kt.
Sun..SW winds 10 to 15 kt. A slight chance of showers and tstms.
Sun night..SW winds 10 to 15 kt. A slight chance of showers and tstms.
Mon..SW winds 10 to 15 kt. A chance of showers and tstms.
Mon night..SW winds 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..SW 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.
Thu..SW winds 5 kt. A chance of showers and tstms.
Thu night..SW winds 5 kt. A slight 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 307 Pm Edt Sat Jul 22 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will continue to extend west into the southeast coast this weekend. 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 221942
afdchs
area forecast discussion
national weather service charleston sc
342 pm edt Sat jul 22 2017

Synopsis
Atlantic high pressure will continue to extend west into the
southeast coast this weekend. 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 until 6 am Sunday morning
Although an isolated shower or TSTM may develop across far
southwest ga through early evening, the cap will hold strong and
maintain dry conditions over land through tonight. There will,
however, be a few showers or storms that pop up across the gulf
stream as moisture and convergence increase offshore. Lows will
be in the mid 70s most areas. Beaches will remain around 80.

Short term 6 am Sunday morning through Tuesday
Sunday, the mid level pattern over the region will feature a broad
weakness, with a large ridge centered over the atlantic and another
ridge centered over the red river valley. However, low pressure is
expected to develop across the mid atlantic states, with the trough
remaining across the carolina foothills and piedmont. The pressure
gradient across the forecast area will slowly steepen through the
day, with gusty conditions expected across the marine zones and near
the coast. Forecast soundings indicate that the LFC will range
between 4-5 kft, with shallow CIN lingering into the late afternoon.

A slight increase in llvl moisture convergence should support
scattered thunderstorms inland, with slight chcs generally east of i-
95. Maximum temperatures should reach around 90 over the beaches to
the mid 90s across inland ga.

Monday, nam12 shows a mid level low and sfc low passing north of the
coastal zones during the morning hours. This feature appears much
weaker on the other short range models, I will favor the gfs. Using
a blend of temperature guidance, high temperatures are forecast to
range a degree or two below values reached sun. Dewpoints are
expected to remain in the low to mid 70s as a sfc trough remains
west of the region. Given the temperatures and dewpoints, any cin
should erode during the late afternoon hours. Short range guidance
indicates that a weak short wave is expected to ripple across the
forecast area during the late afternoon. Pops should range from 40
percent over ga and around 30 near the coast and coastal waters.

Tuesday, the 12z GFS indicates that the axis of deep moisture will
shift across the CWA during the daylight hours. Pw values are
forecast to increase to around 2.3 inches. Features across the
forecast area will remain limited to broad mid level trough with low
pressure across the southern appalachian mountains. Provided
generally weak forcing and tall and thin instability, I will keep
pops limited to high chc.

Long term Tuesday night through Saturday
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 19z Saturday through Thursday
Vfr at ksav kchs through 18z Sunday.

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
Sw winds will increase slightly overnight as the gradient tightens
between an inland trough and bermuda high pressure. Winds may
approach 15 kt late tonight with seas building slightly.

Sunday through Thursday, broad high pressure will remain across the
western atlantic as low pressure remain inland. Low pressure may
deepen across the mid atlantic states late Sunday into Monday. A
steeper pressure gradient should support gusty SW winds Sunday and
Monday afternoon and evening, gusts may near 25 kts. Conditions are
expected to remain below small craft advisory criteria. Low pressure
will gradually settle over the southern appalachians Monday and
Tuesday, shifting over the ga sc coastal waters by late Wednesday.

Winds should weaken and shift from the se. Thunderstorm coverage is
forecast to increase each day through Wednesday.

Tides coastal flooding
Tidal anomaly supports coastal flood advisory for the sc ga
coasts this evening for minor saltwater flooding. Tides will
remain elevated into early next week as the lunar perigee and
new moon approach. Additional advisories are likely.

Chs watches warnings advisories
Ga... Coastal flood advisory from 7 pm to 9 pm edt this evening for
gaz117-119-139-141.

Sc... Coastal flood advisory from 7 pm to 9 pm edt this evening for
scz048>051.

Marine... None.

Near term... Jrl
short term... Ned
long term... Dpb
aviation... Jrl ned
marine... Jrl ned
tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 19 mi52 min SSE 8.9 G 11 86°F 87°F1014.7 hPa (-2.4)
FBIS1 - Folly Island, SC 25 mi52 min S 12 G 13 85°F 1015.3 hPa (-2.4)74°F
ACXS1 - ACE Basin Reserve, SC 31 mi67 min SSE 1.9 89°F 1014 hPa78°F
41029 - Capers Nearshore (CAP 2) 32 mi44 min SSW 12 G 18 82°F 84°F1014.4 hPa
41033 48 mi44 min S 12 G 16 83°F 86°F1014.3 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Summerville Airport, SC8 mi57 minWSW 410.00 miFair91°F71°F52%1014.2 hPa
Charleston, Charleston Air Force Base, SC10 mi56 minSSW 1010.00 miA Few Clouds92°F75°F58%1014 hPa
Moncks Corner Berkeley County, SC18 mi77 minSW 710.00 miFair91°F69°F49%1014.2 hPa
Charleston Executive Airport, SC21 mi57 minS 810.00 miFair90°F75°F63%1014.6 hPa
Mount Pleasant Regional-Faison Field, SC23 mi57 minS 910.00 miFair90°F75°F63%1014.6 hPa
Walterboro Lowcountry Regional Airport, SC24 mi57 minSSW 410.00 miPartly Cloudy90°F71°F55%1014.6 hPa

Wind History from DYB (wind in knots)
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Last 24hrS6S5S6S3CalmS3CalmCalmCalmS3CalmS3CalmCalmCalmSW4S3CalmS3CalmW5SW3SW4S4
1 day agoS4S4S5S3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3SW3CalmS4CalmS4S3CalmS4
2 days agoNW5E4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW3W4CalmCalmS3CalmCalm

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
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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 (16,3,4,5)
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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.