Wednesday, August16, 2017 L-36.com


Marine Weather and Tides
Kiawah Island, 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 6:43AMSunset 8:04PM Wednesday August 16, 2017 11:23 AM EDT (15:23 UTC) Moonrise 12:30AMMoonset 2:34PM Illumination 31% Phase: Waning Crescent; Moon at 24 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- 929 Am Edt Wed Aug 16 2017
Rest of today..W winds 5 to 10 kt, becoming sw late.
Tonight..SW winds 5 to 10 kt. A slight chance of showers and tstms.
Thu..W winds 5 kt, becoming S in the afternoon. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Thu night..SW winds 10 kt. A chance of showers and tstms, mainly in the evening.
Fri..SW winds 10 to 15 kt. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Fri night..SW winds 10 to 15 kt. A chance of showers and tstms.
Sat..SW winds 10 to 15 kt. A chance of showers and tstms.
Sat night..SW winds 10 to 15 kt. A chance of showers and tstms.
Sun..SW winds 10 kt. A chance of showers and tstms.
Sun night..S winds 5 to 10 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 85 degrees.
AMZ300 929 Am Edt Wed Aug 16 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will remain in control as troughing persists across the mid-atlantic region and inland into late week. A cold front will approach this weekend, likely falling apart early next week as high pressure returns.

7 Day Forecast for Marine Location Near Kiawah Island, SC
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location: 32.59, -80.11     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 161415
afdchs
area forecast discussion
national weather service charleston sc
1015 am edt Wed aug 16 2017

Heat advisory issued for coastal counties of southeast south
carolina and southeast georgia...

Synopsis
Atlantic high pressure will remain in control as troughing
persists across the mid-atlantic region and inland into late
week. A cold front will approach this weekend, likely falling
apart early next week as high pressure returns.

Near term until 6 pm this evening
Temperatures are off to a very warm start this morning under
full insolation. 16 14z temperatures were running about 3-5
degrees warmer than 24 hours ago. It will be another and hot and
muggy day for the region as subtropical high pressure centered
near the florida panhandle holds firm. Modified soundings show
capping holding for much of the day and with westerly downslope
winds atop the boundary layer keeping the sea breeze pinned
until very late, there does not appear to be much of a trigger
for afternoon convection. The latest runs of the various high
resolution models are fairly dry with the exception of the 4km-
nssl WRF which has been a bit bullish on the development of
showers tstms for the past few days. Mentionable pops will be
removed with the mid-morning update.

Despite a westerly flow, dewpoints never did mix out as expected
Tuesday afternoon with afternoon heat indices reaching 106-109
for a number of coastal locations. This could be because ground
moisture is running very high due to multiple rounds of
showers tstms that have occurred over the past several weeks.

The various guidance packages have done pretty well with keeping
dewpoint elevated in in the westerly flow regime, which is a bit
unusual. The latest data keep dewpoints in the mid-upper 70s
today, except well inland were a few spots could mix out into
the lower 70s. These values coupled with highs in the mid-upper
90s yield heat indices of 107-113 for several hours this
afternoon with the highest values occurring across the coastal
counties. Given many coastal locations were near 110 yesterday
and surface temperatures should be about a degree or two warmer
today, a heat advisory will be posted for the coastal counties
of southeast south carolina and southeast georgia from 2-7 pm.

Right now, it appears values will remain below excessive heat
warning criteria of 115, but it might be close in a few spots.

Short term 6 pm this evening through Saturday
Tonight: another warm and muggy overnight is on tap. We
maintained a late night chance of convective rains along the sc
beaches close to a weaker land breeze.

Thursday through Saturday: for the most part, ridging will
dominate aloft while the surface pattern features a lee-side
trough and atlantic high pressure extending across fl into the
gulf of mexico. The main mechanisms for convection will be the
sea breeze and the proximity to the inland trough, although
boundary interactions will come into play as coverage increases
each afternoon. This will allow for scattered pop's each day,
with activity to wind down with nocturnal influences each night.

Steering flow is weak and pwat is at least 2 inches, and this
will support the risk for locally heavy downpours, but no
widespread flooding concerns are anticipated.

Our 850 mb temps average 19-20c, above the 90th percentile for mid
august, while 925 mb temps are as high as 26-27c, or about as high
as they can get this time of year. This will support MAX temps above
normal, but exactly how hot depends on the onset of diurnal
convection. For now we have lower and middle 90s each day inland
from the immediate coast, with lows at best only down into the mid
and upper 70s.

Heat indices will be as high as 106-108f Thursday, 105-107f Friday
and 103-105f Saturday. Not quite to heat advisory thresholds, but
certainly making for unbearable uncomfortable outdoor conditions
where there can be an increased risk for heat disorders with
prolonged outside exposure and or strenuous activity.

Long term Saturday night through Tuesday
A cold front upstream will attempt to approach but will likely fall
apart as it runs into a strong blocking ridge both surface and
aloft. The typical instability along with sufficient moisture and
meso-scale boundary interactions will support a chance of mainly
diurnally driven convection each day through the extended period,
including Monday the day of the total solar eclipse. Above average
heights, 925 and 850 mb temps and low level thickness will allow for
a continuation of above normal highs and lows.

Aviation 14z Wednesday through Sunday
Vfr conditions are expected to prevail through 12z Thursday.

Only a very small chance that an isolated shower or tstm
develops near a pinned sea breeze late day or early evening.

Extended aviation outlook: temporary flight restrictions can occur
in scattered diurnal convection through Sunday.

Marine
Today through Saturday: the coastal waters will lie in a general
sw'erly flow along the fringes of atlantic high pressure, as a
piedmont trough persists inland over the se. While afternoon sea
breeze influences and nocturnal low level jetting will give a
boost to winds, speeds on average will be no more than 15-18 kt.

Seas will hold at or below 3 or 4 ft. Expect isolated to scattered
showers and t-storms through the entire period.

Sunday through Monday: a cold front upstream will never reach the
waters as high pressure holds firm, keeping winds and seas below any
sca conditions. Isolated to scattered showers and t-storms will
again prevail.

Equipment
The temperature sensor at the downtown charleston observation
site (kcxm) has failed. Technicians are working to resolve the
problem. Temperature and dewpoint data will not be available
until the sensor is replaced.

Chs watches warnings advisories
Ga... Heat advisory from 2 pm this afternoon to 7 pm edt this
evening for gaz116>119-138>141.

Sc... Heat advisory from 2 pm this afternoon to 7 pm edt this
evening for scz045-047>052.

Marine... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 13 mi84 min WNW 5.1 G 7 87°F 1017.1 hPa (+1.1)76°F
CHTS1 16 mi54 min WNW 7 G 11 91°F 86°F1016.9 hPa
ACXS1 - ACE Basin Reserve, SC 18 mi99 min WNW 1.9 86°F 1017 hPa77°F
41033 27 mi76 min W 5.8 G 7.8 85°F 1016.9 hPa
41029 - Capers Nearshore (CAP 2) 30 mi76 min WNW 5.8 G 7.8 85°F 85°F1016.4 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi44 min W 7.8 G 9.7 83°F 83°F1016.4 hPa79°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi29 minWNW 810.00 miFair91°F77°F63%1016.9 hPa
Charleston, Charleston Air Force Base, SC23 mi88 minNW 510.00 miA Few Clouds87°F75°F70%1016.5 hPa

Wind History from JZI (wind in knots)
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Last 24hrW44W9W7W9S11S10SW7S6SW4SW4CalmSW5SW4W4W4W5W7W7W4W6W7W7W7
1 day agoS5S7SE8SE7CalmCalmS8S5S6CalmCalmCalmCalmCalmW5CalmCalmCalmCalmCalmW3W6W75
2 days agoSE8SE10
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S8S6CalmS3S6S6S7S8S7CalmCalmCalmCalmCalmCalmCalmSW6

Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
Click for Map
Wed -- 01:30 AM EDT     Moonrise
Wed -- 03:28 AM EDT     5.41 feet High Tide
Wed -- 06:45 AM EDT     Sunrise
Wed -- 09:38 AM EDT     0.14 feet Low Tide
Wed -- 03:34 PM EDT     Moonset
Wed -- 04:13 PM EDT     6.49 feet High Tide
Wed -- 08:03 PM EDT     Sunset
Wed -- 10:30 PM EDT     0.75 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.944.95.35.34.73.52.21.10.30.20.92.23.75.166.56.35.44.12.71.60.80.8

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 12:07 AM EDT     1.48 knots Max Flood
Wed -- 01:29 AM EDT     Moonrise
Wed -- 03:31 AM EDT     -0.00 knots Slack
Wed -- 06:43 AM EDT     Sunrise
Wed -- 07:04 AM EDT     -2.25 knots Max Ebb
Wed -- 10:03 AM EDT     0.00 knots Slack
Wed -- 12:36 PM EDT     1.86 knots Max Flood
Wed -- 03:33 PM EDT     Moonset
Wed -- 04:29 PM EDT     -0.00 knots Slack
Wed -- 07:50 PM EDT     -2.48 knots Max Ebb
Wed -- 08:02 PM EDT     Sunset
Wed -- 10:59 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.20.80.3-0.4-1.3-2-2.3-2-1.1-0.111.71.81.410.4-0.5-1.5-2.2-2.5-2-1.10

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 (11,2,3,4)
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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.