Wednesday, January22, 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 7:18AMSunset 5:43PM Wednesday January 22, 2020 2:26 AM EST (07:26 UTC) Moonrise 5:32AMMoonset 3:47PM Illumination 9% Phase: Waning Crescent; Moon at 27 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- 1205 Am Est Wed Jan 22 2020
.small craft advisory in effect through this afternoon...
Rest of tonight..N winds 20 to 25 kt with gusts to 30 kt. Waves 2 to 3 ft.
Wed..N winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft.
Wed night..NE winds 10 to 15 kt with gusts to 20 kt.
Thu..NE winds 10 kt.
Thu night..NE winds 10 kt. A chance of showers.
Fri..E winds 5 to 10 kt. Showers likely.
Fri night..S winds 10 kt, becoming sw after midnight. Showers likely.
Sat..W winds 10 to 15 kt.
Sat night..W winds 10 to 15 kt.
Sun..NW winds 5 to 10 kt.
Sun night..NW winds 5 to 10 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 55 degrees.
AMZ300 1205 Am Est Wed Jan 22 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Chilly high pressure will build across the area from the north through mid week before weakening in advance of a storm system impacting the region late week. High pressure should then return through early next 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 220535 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1235 AM EST Wed Jan 22 2020

SYNOPSIS. Chilly high pressure will build across the area from the north through mid week before weakening in advance of a storm system impacting the region late week. High pressure should then return through early next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/. GOES-E IR imagery shows high-level moisture streaming onshore associated with low pressure developing well offshore of the Florida east coast. KCLX has been pinging light returns along the coast and across the coastal waters for several hours now, but this is mostly virga falling from a 12.0-15.0 kft cloud deck. RAP soundings suggest the atmosphere is just too dry to support measurable precipitation, but a flurry or two can not be completely ruled out across mainly the coastal counties over the next few hours. Temperatures have been slow to fall tonight as a pocket of warmer mid-level air wrapping around the low pressure area offshore advects onshore. Noted H8 temperatures are progged to rise from about -5C to +3C by daybreak. Low temperatures have been nudged up a bit as a result. Did not adjust lows up as much as some guidance would suggest, but still expect a cold, blustery early morning with wind chills falling into the upper teens to lower 20s, or just above Wind Chill Advisory criteria for the coastal and far southern counties.

Lake Winds: Observations from PNOS1 along the south side of Lake Moultrie show winds have been averaging 20-25 kt with gusts as high as 30 kt over the past few hours. Increased winds slightly to reflect this. Waves were also increased from 1-2 ft to 2-3 ft given these higher speeds. A Lake Wind Advisory continues.

SHORT TERM /6 AM THIS MORNING THROUGH FRIDAY/. Moderate to high confidence this period. Chilly high pressure to the north will prevail inland through Thursday with mainly dry conditions, although can't rule out a few showers Thursday near the GA coast due to a developing coastal trough. The trough should sharpen up Thursday night before pushing north through the area Friday as a warm front. Shower chances will increase Thursday night becoming likely Friday into Friday night before generally ending from southwest to northeast into early Saturday. Temperatures will remain at or below normal through Thursday before getting back above normal Thursday night/Friday.

Lake Winds . Breezy north winds are expected to gust near 25 knots into Wednesday morning in/near Lake Moultrie. Thus, a Lake Wind Advisory will be in effect.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/. A cold front is expected to shift across the area Friday night, producing scattered to numerous showers at most locations. Sfc high pressure will then spread across the area Saturday and become centered across the region early next week while a mid-lvl trough prevails over the Mid-Atlantic and Northeast states. The pattern will support slightly cooler conditions once fropa occurs, but temps should remain within a few degrees of normal. In general, high temps should range in the upper 50s/lower 60s each day while lows dip into the mid/upper 30s inland to lower 40s near the coast.

AVIATION /06Z WEDNESDAY THROUGH SUNDAY/. VFR with gusty winds continuing at both KCHS and KSAV.

Extended Aviation Outlook: High confidence in VFR conditions through Thursday, then lower confidence in restrictions starting Thursday night and continuing through Friday night due to low clouds/showers. High confidence in VFR conditions this weekend.

MARINE. Tonight: The pressure gradient will remain enhanced in between high pressure inland and strengthening low pressure southeast of the waters. North winds are forecast to gust to 35-40 knots and a Gale Warning is now in effect for all waters, with the exception of the Charleston Harbor where a Small Craft Advisory will persist. The highest winds will occur in the outer portions of the marine zones. Seas will build as well, averaging 5-9 ft in the nearshore waters and 9-13 ft beyond by daybreak.

Wednesday through Sunday: Moderate to high confidence through the period. Hazardous marine conditions are expected through Wednesday for all waters due to a tight pressure gradient between inland high pressure and offshore low pressure. Gales are likely for all waters outside Charleston Harbor. Expect some improvement starting Wednesday night as the pressure gradient begins to weaken leading to slowly lowering winds/seas but Advisory conditions will likely linger through Thursday across the nearshore waters and into early next week over the offshore waters beyond 20 nm.

TIDES/COASTAL FLOODING. Strong high pressure to the north and low pressure offshore will maintain elevated north/northeast winds through mid week which could push tide levels slightly above coastal advisory thresholds during the morning high tides, especially near Charleston.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . Lake Wind Advisory until 11 AM EST this morning for SCZ045. MARINE . Gale Warning until 11 AM EST this morning for AMZ352-354. Gale Warning until 1 PM EST this afternoon for AMZ350. Gale Warning until 7 PM EST this evening for AMZ374. Small Craft Advisory until 5 PM EST this afternoon for AMZ330.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 13 mi86 min N 16 G 19 36°F 1025 hPa (-0.5)17°F
CHTS1 16 mi56 min 37°F 55°F1024.6 hPa
ACXS1 - ACE Basin Reserve, SC 18 mi101 min N 5.1 34°F 1025 hPa16°F
41033 27 mi78 min NE 21 G 29 39°F 54°F1023.8 hPa
41029 - Capers Nearshore (CAP 2) 30 mi78 min NE 21 G 31 38°F 55°F1024.9 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi36 min 29 G 39 71°F1021.5 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi31 minN 0 G 1010.00 miA Few Clouds34°F14°F44%1024.7 hPa
Charleston, Charleston Air Force Base, SC23 mi90 minNNE 12 G 2010.00 miA Few Clouds34°F12°F40%1025.1 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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1 day agoCalmCalmCalmN5
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CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoSW3
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Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
Click for Map
Wed -- 05:31 AM EST     Moonrise
Wed -- 06:23 AM EST     6.25 feet High Tide
Wed -- 07:20 AM EST     Sunrise
Wed -- 12:24 PM EST     0.01 feet Low Tide
Wed -- 03:46 PM EST     Moonset
Wed -- 05:43 PM EST     Sunset
Wed -- 06:33 PM EST     4.99 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.30.41.63.14.55.66.26.15.342.40.90.10.212.13.34.34.94.94.33.21.90.6

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
Wed -- 12:30 AM EST     0.01 knots Slack
Wed -- 03:42 AM EST     2.26 knots Max Flood
Wed -- 05:31 AM EST     Moonrise
Wed -- 06:56 AM EST     -0.01 knots Slack
Wed -- 07:19 AM EST     Sunrise
Wed -- 10:15 AM EST     -2.57 knots Max Ebb
Wed -- 01:26 PM EST     0.00 knots Slack
Wed -- 03:45 PM EST     Moonset
Wed -- 04:19 PM EST     1.61 knots Max Flood
Wed -- 05:42 PM EST     Sunset
Wed -- 07:06 PM EST     -0.00 knots Slack
Wed -- 10:18 PM EST     -2.33 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.70.61.72.22.221.2-0.1-1.3-2.2-2.6-2.4-1.7-0.50.61.31.61.51.10.1-1-1.9-2.3-2.2

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 (2,6,7,8)
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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.