Wednesday, September23, 2020
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Marine Weather and Tides
Hanahan, SC

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:08AMSunset 7:16PM Wednesday September 23, 2020 2:04 PM EDT (18:04 UTC) Moonrise 1:02PMMoonset 11:10PM Illumination 39% Phase: Waxing Crescent; Moon at 6 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- 1251 Pm Edt Wed Sep 23 2020
This afternoon..S winds 5 kt.
Tonight..S winds 5 kt or less, becoming variable.
Thu..SW winds 5 kt, becoming se 5 to 10 kt in the afternoon. A slight chance of showers and tstms in the afternoon.
Thu night..SE winds 5 to 10 kt. A slight chance of tstms in the evening. A slight chance of showers.
Fri..SE winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Fri night..SE winds 10 kt. A chance of showers with a slight chance of tstms.
Sat..SE winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Sat night..SE winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Sun..SE winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Sun night..S winds 5 to 10 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 75 degrees.
AMZ300 1251 Pm Edt Wed Sep 23 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will shift offshore by Thursday. Rain chances will then increase through the weekend as a cold front approaches the region early next week.


7 Day Forecast for Marine Location Near Hanahan, SC
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location: 32.91, -79.94     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 231703 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 103 PM EDT Wed Sep 23 2020

SYNOPSIS. High pressure will shift offshore by Thursday. Rain chances will then increase through the weekend as a cold front approaches the region early next week.

NEAR TERM /THROUGH TONIGHT/. High pressure at the surface and aloft will maintain control of the local weather today. The 12z KCHS RAOB showed extensive dry air up to around 500 mb which will prevent any measurable rainfall from occurring. Mid and high level clouds will persist through the day although will see more sunshine as the day progresses. Temperatures will continue to be below normal, with highs forecast to mainly be in the mid and upper 70s. Ongoing forecast was in pretty good shape, so only minor tweaks were needed with the early afternoon update.

Tonight: Subtropical ridging will remain in place aloft as surface high pressure shifts offshore into the Atlantic. The boundary layer will decouple quickly after sunset resulting in a light/variable wind field. Cirrus should diminish overnight as the 200-400 hPa flow backs ahead of the upper trough kicking out of the Central Plains and into the Ohio Valley. The combination of mostly clear skies and light/calm winds will result in a strong radiational cooling regime. Lows tonight have been trended closer to the colder 23/00z guidance members. This yields lows from the upper 50s across the far interior to the upper 60s along the beaches. A few mid 50s could occur in some of the normally colder spots such as eastern Berkeley and interior upper Charleston County in the Francis Marion National Forest.

SHORT TERM /THURSDAY THROUGH SATURDAY/. An upper level trough and the remnants of TC Beta will continue to drift closer to the area on Thursday. As deep moisture replaces dry air from the ridge moving offshore, slight chance POPs have been maintained across the area. On Friday, a surface level trough is expected to lift across the area. The best chance of rain still looks to be interior SE GA/SC as shortwave energy will be situated just to the north, and PWATs will be around 2.0 inches. By Saturday, forcing looks to be minimal but as tropical moisture lingers, could see scattered showers/thunderstorms. Instability is not overly impressive, so have included just a slight chance of thunderstorms but do not expect any severe weather. Temperatures will be near normal and warmer than we have been seeing with highs in the low to mid 80s.

LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/. Overall, there is still some model inconsistency on how much deep moisture will remain situated over the area as a cold front approaches from the northwest. Ahead of the front, could see scattered showers/thunderstorms so have maintained chance POPs on Sunday. The cold front should move quickly through the area Sunday night into Monday morning. While the ECMWF has drier air behind the front, the GFS keeps things pretty moist, with PWATs around 2.0 inches. Therefore, have maintained slight chance POPs on Monday. A deep trough will stretch across much of the central US into Canada as a second cold front starts to dip further south by Tuesday. While there will be enough forcing and deep moisture as the cold front moves across the region, have capped POPs at slight chance to account for uncertainty of timing and strength. The severe potential still looks to be low but not out of the question as surface based CAPE could be in the 2100-2600 J/kg. Highs will be in the low to mid 80s ahead of the Tuesday cold front with lows in the mid to uppers 60s.

AVIATION /18Z WEDNESDAY THROUGH MONDAY/. VFR is expected through 18z Thursday.

Extended Aviation Outlook: VFR will prevail. By late week and into the weekend, flight restrictions will be possible in showers/thunderstorms.

MARINE. Through Tonight: Light winds will become more southerly this afternoon and tonight as high pressure shifts farther offshore into the Atlantic. Winds will remain less than 10 kt. Seas will be mostly comprised of long period east/northeast swell generated by Post-Tropical Cyclone Teddy. Wave heights will subside to 2-4 ft nearshore, 4-7 ft offshore this afternoon and 1-2 ft nearshore with 3-5 ft offshore by early Thursday. A Small Craft Advisory for seas 6 ft or greater remains in effect for the Georgia offshore leg through 4 AM Thursday.

Thursday through Monday: As high pressure pushes further east, southeasterly winds will prevail, generally less than 10 kts through the weekend. With an approaching shortwave trough from the west, moisture will increase. Scattered showers and thunderstorms will be possible each day. As the pressure gradient slightly tightens, we could see an uptick in winds but still only expecting occasional gusts to around 15 kts. Seas will be 2-4 ft.

Rip Currents: Lingering long period swells of 14-15 seconds generated by Post-Tropical Cyclone Teddy will yield a moderate risk for rip currents at all beaches today.

TIDES/COASTAL FLOODING. Tides are expected to peak 7.2-7.4 ft MLLW in the Charleston Harbor with the afternoon high tide. A Coastal Flood Advisory has been issued.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . Coastal Flood Advisory until 4 PM EDT this afternoon for SCZ048>050. MARINE . Small Craft Advisory until 4 AM EDT Thursday for AMZ374.



NEAR TERM . ETM SHORT TERM . LONG TERM . AVIATION . ETM MARINE . TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 9 mi46 min E 4.1 G 5.1 71°F 74°F1019.4 hPa
FBIS1 - Folly Island, SC 16 mi64 min SSE 5.1 G 6 69°F 1020 hPa (-0.7)
41029 - Capers Nearshore (CAP 2) 18 mi56 min ESE 1.9 G 3.9 69°F 74°F1019.6 hPa
ACXS1 - ACE Basin Reserve, SC 36 mi79 min Calm 76°F 1020 hPa56°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 50 mi79 min E 1.9 70°F 1019 hPa50°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston, Charleston Air Force Base, SC5 mi68 minN 010.00 miPartly Cloudy73°F48°F43%1019.2 hPa
Mount Pleasant Regional-Faison Field, SC8 mi69 minVar 310.00 miFair73°F53°F50%1019.3 hPa
Charleston Executive Airport, SC15 mi69 minN 09.00 miFair75°F50°F41%1019.6 hPa
Moncks Corner Berkeley County, SC20 mi69 minESE 310.00 miFair72°F50°F47%1019.6 hPa
Summerville Airport, SC21 mi69 minN 010.00 miFair72°F50°F47%1019.3 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrN73N4N5NW5N5N4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3NE5N5Calm
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NE9NE10NE8NE8NE9NE9NE10NE8N9NE8NE7NE8NE9NE96Calm
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Tide / Current Tables for Clouter Creek, north entrance, Cooper River, South Carolina
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Clouter Creek
Click for Map
Wed -- 02:00 AM EDT     5.63 feet High Tide
Wed -- 07:08 AM EDT     Sunrise
Wed -- 07:53 AM EDT     0.52 feet Low Tide
Wed -- 02:01 PM EDT     Moonrise
Wed -- 02:47 PM EDT     6.58 feet High Tide
Wed -- 07:14 PM EDT     Sunset
Wed -- 08:46 PM EDT     1.02 feet Low Tide
Wed -- 09:56 PM EDT     First Quarter
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.65.35.65.34.331.80.80.5123.34.65.76.46.664.93.52.21.311.52.4

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 01:31 AM EDT     -0.00 knots Slack
Wed -- 04:51 AM EDT     -2.16 knots Max Ebb
Wed -- 07:08 AM EDT     Sunrise
Wed -- 08:00 AM EDT     0.00 knots Slack
Wed -- 10:35 AM EDT     1.58 knots Max Flood
Wed -- 02:00 PM EDT     Moonrise
Wed -- 02:31 PM EDT     -0.00 knots Slack
Wed -- 05:41 PM EDT     -2.49 knots Max Ebb
Wed -- 07:14 PM EDT     Sunset
Wed -- 08:52 PM EDT     0.00 knots Slack
Wed -- 09:56 PM EDT     First Quarter
Wed -- 10:53 PM EDT     1.30 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.4-0.4-1.3-2-2.1-1.7-0.9-00.91.51.61.41.20.5-0.5-1.6-2.3-2.4-1.9-0.90.111.3

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
Ground Weather Radar Station Charleston, SC
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