Tuesday, August4, 2020
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Marine Weather and Tides
Kiawah Island, SC

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:34AMSunset 8:16PM Tuesday August 4, 2020 12:43 AM EDT (04:43 UTC) Moonrise 8:19PMMoonset 6:21AM Illumination 100% Phase: Full Moon; Moon at 15 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- 1116 Pm Edt Mon Aug 3 2020
.small craft advisory in effect until 2 am edt Tuesday...
Overnight..W winds 10 to 15 kt with gusts to 25 kt, diminishing to 5 to 10 kt late. A slight chance of showers and tstms.
Tue..W winds 5 kt, becoming S in the afternoon.
Tue night..S winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight.
Wed..S winds 5 to 10 kt. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Wed night..S winds 5 to 10 kt. A chance of showers and tstms in the evening.
Thu..S winds 5 to 10 kt. A chance of showers and tstms.
Thu night..S winds 5 to 10 kt. A chance of showers and tstms.
Fri..SW winds 5 to 10 kt. A chance of showers and tstms.
Fri night..S winds 5 to 10 kt. A chance of showers and tstms.
Sat..SW winds 5 kt. A chance of showers and tstms.
Sat 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 85 degrees.
AMZ300 1116 Pm Edt Mon Aug 3 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Isaias will move north into the upper south carolina or lower north carolina coast late tonight. A stationary front will stall out across the southeast u.s mid to late week.


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 040330 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1130 PM EDT Mon Aug 3 2020

SYNOPSIS. Isaias will move north into the upper South Carolina or lower North Carolina coast late tonight. A stationary front will stall out across the Southeast U.S mid to late week.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. As of 1120 PM: Latest update from NHC indicates that Isaias has made landfall near Ocean Isle Beach at 1110 PM. Conditions will improve across the region tonight. Tropical Storm Warnings for Charleston and Berkeley Counties, Flash Flood Watch, High Surf Advisory have been cancelled with this update.

Previous Discussion: This evening: The circulation of now Hurricane Isaias is almost out of the coastal waters and the last bit of rain associated with it is only impacting far eastern Berkeley and Charleston counties. We have maintained the Flash Flood Watch since rain is still occurring, but the threat is certainly quickly diminishing. As if a tropical system wasn't enough, we now must turn our attention to the west where a line of thunderstorms has entered the forecast area. It certainly doesn't appear to be severe, but cloud to ground lightning, brief heavy rainfall, and gusty winds will be possible for much of southeast Georgia and even just across the Savannah River into southeast South Carolina. This convection should dissipate by late evening and the rest of the overnight is rain free.

SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/. There will be a return to a more normal convective pattern by mid-week in the wake of Isaias as a broad, longwave trough persists across the eastern United States. Scattered convection appears likely each afternoon mainly along/inland of the sea breeze. Some isolated, nocturnal convection will be possible across the coastal waters, especially out closer to the western wall of the Gulf Stream. Temperatures will be near seasonal normals with highs ranging form the lower-mid 90s each afternoon with lows in the lower- mid 70s, except upper 70s/near 80 at the beaches and Downtown Charleston.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/. A mid-level trough will persist over the East Coast while a stationary front hovers over or near area. The typical afternoon and evening showers and thunderstorms are expected. Temperatures should be near normal.

AVIATION /03Z TUESDAY THROUGH SATURDAY/. At KCHS: Rain associated with Isaias has moved out and skies will steadily clear. MVFR ceilings will linger for a bit, but VFR conditions should return by at least the early morning hours. Thereafter, VFR will prevail.

At KSAV: Overall, VFR conditions are expected to prevail. We will have to watch a line of thunderstorms moving through southeast Georgia. If the storms were to reach the terminal it would be by around 01 to 0130 UTC.

Extended Aviation Outlook: There is a risk for scattered showers/tstms impacting the terminals day afternoon.

MARINE. Tonight: Isaias has almost moved out of the local waters. We have now dropped the Tropical Storm Warning for the Charleston Harbor and replaced with a Small Craft Advisory. The same should happen for the Charleston County waters with the next advisory. Conditions will then continue to improve through the rest of the night.

Tuesday through Saturday: There are no concerns. Some backswell from Isaias will impact the waters Tuesday, but will quickly diminish. Otherwise, a typical summertime mid-summer marine pattern will prevail with southerly winds and localized sea breeze enhancements each afternoon. Seas will average 2-4 ft with seas around 10 kt.

Rip Currents: The High Risk continues through tonight for all beaches. Lingering backswell generated by Isaias will support a moderate risk for rip currents at all beaches Tuesday.

CHS WATCHES/WARNINGS/ADVISORIES. GA . High Risk for Rip Currents until 6 AM EDT Tuesday for GAZ117-119- 139-141. SC . High Risk for Rip Currents until 6 AM EDT Tuesday for SCZ048>051. MARINE . Small Craft Advisory until 2 AM EDT Tuesday for AMZ330-352-354. Tropical Storm Warning for AMZ350. Small Craft Advisory until 8 AM EDT Tuesday for AMZ374.

NEAR TERM . NED SHORT TERM . ST LONG TERM . MS AVIATION . BSH/ST MARINE . BSH/ST


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 13 mi103 min W 8.9 G 14 77°F 1011.8 hPa (+5.8)
CHTS1 16 mi55 min W 6 G 11 76°F 85°F1011.8 hPa
ACXS1 - ACE Basin Reserve, SC 18 mi58 min W 1.9 76°F 1013 hPa71°F
41033 27 mi35 min NNW 12 G 18 79°F 85°F1012.3 hPa
41029 - Capers Nearshore (CAP 2) 30 mi35 min WNW 16 G 21 78°F 83°F1011.2 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi33 min W 19 G 27 80°F 83°F1012 hPa73°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi48 minW 710.00 miFair75°F71°F89%1012.2 hPa
Charleston, Charleston Air Force Base, SC23 mi47 minW 610.00 miMostly Cloudy75°F71°F88%1011.5 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrE4E4E5E5E7CalmCalmE5NE7NE10
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Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
Click for Map
Tue -- 03:19 AM EDT     0.14 feet Low Tide
Tue -- 06:37 AM EDT     Sunrise
Tue -- 07:21 AM EDT     Moonset
Tue -- 09:31 AM EDT     5.52 feet High Tide
Tue -- 03:22 PM EDT     0.03 feet Low Tide
Tue -- 08:15 PM EDT     Sunset
Tue -- 09:19 PM EDT     Moonrise
Tue -- 10:01 PM EDT     6.59 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.22.510.20.41.32.53.84.85.45.44.83.62.20.90.10.21.12.545.36.26.66.2

Tide / Current Tables for Charleston Harbor, off Fort Sumter, South Carolina Current (expired 1996-12-31)
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Charleston Harbor
Click for Map
Tue -- 01:03 AM EDT     -2.64 knots Max Ebb
Tue -- 04:16 AM EDT     0.00 knots Slack
Tue -- 06:35 AM EDT     Sunrise
Tue -- 06:54 AM EDT     1.77 knots Max Flood
Tue -- 07:19 AM EDT     Moonset
Tue -- 09:59 AM EDT     -0.00 knots Slack
Tue -- 01:05 PM EDT     -2.43 knots Max Ebb
Tue -- 04:14 PM EDT     0.00 knots Slack
Tue -- 07:05 PM EDT     2.30 knots Max Flood
Tue -- 08:14 PM EDT     Sunset
Tue -- 09:18 PM EDT     Moonrise
Tue -- 10:31 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.4-2.6-2.4-1.6-0.40.91.61.81.61-0-1.2-2.1-2.4-2.2-1.5-0.3122.32.11.60.7-0.6

Weather Map
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wmap_A
GEOS Local Image of    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (0,6,7,8)
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Ground Weather Radar Station Charleston, SC
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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 numerous 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.