Thursday, July29, 2021
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Marine Weather and Tides
Kiawah Island, SC

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:30AMSunset 8:21PM Thursday July 29, 2021 8:47 PM EDT (00:47 UTC) Moonrise 11:03PMMoonset 11:00AM Illumination 69% Phase: Waning Gibbous; Moon at 20 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- 621 Pm Edt Thu Jul 29 2021
Tonight..S winds 5 to 10 kt, becoming sw late.
Fri..SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Waves 1 to 2 ft.
Fri night..SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Waves 1 to 2 ft.
Sat..W winds 5 to 10 kt, becoming sw 10 to 15 kt in the afternoon. A slight chance of showers and tstms in the afternoon.
Sat night..SW winds 10 kt. A chance of showers and tstms.
Sun..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.
Sun night..SW winds 10 to 15 kt with gusts to 20 kt. A chance of showers and tstms.
Mon..SW winds 10 to 15 kt. Showers and tstms likely.
Mon night..SW winds 10 to 15 kt. Showers and tstms.
Tue..SW winds 10 to 15 kt. Showers and tstms.
Tue night..SW winds 10 to 15 kt. Showers and tstms likely. 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 621 Pm Edt Thu Jul 29 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build over the area into Friday night. A cold front will then stall over or just north of the area through the middle of 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 292238 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 638 PM EDT Thu Jul 29 2021

SYNOPSIS. High pressure will build over the area into Friday night. A cold front will then stall over or just north of the area through the middle of next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. Quiet weather will prevail tonight. Lingering cu will continue to dissipate with loss of heating, resulting in clear skies overnight. Can't rule out some cirrus dropping in from the north late tonight. Lows will average in the mid 70s, except upper 70s near the immediate coast. Ongoing forecast was in good shape, so very little change was needed with the early evening update.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/. Forecast confidence: Moderate.

Deep high pressure into Friday night across the SC Lowcountry/GA Coastal Empire will give way to an approaching cold front by this weekend. The main concern this period will be the potential for excessive heat, which would really be the first time this year.

On Friday, the low-level flow will be more west-southwest and ridging will be strongest which will limit the sea breeze influence and overall risk for convection. Temperatures should push toward the century mark inland with even coastal areas possibly touching 90 degrees. The biggest forecast challenge is dewpoint temperatures which will likely lower inland during the day but surge near the coast late. At this point we are forecasting heat indices peaking close to 115 degrees just inland from the immediate coast and we have thus issued an Excessive Heat Watch there with a Heat Advisory for slightly lower heat indices for much of the rest of the Lowcountry/Coastal Empire except for areas well inland toward the CSRA where confidence is lowest in reaching heat indices of 110 degrees. Some shortwave energy could help spark a few showers/storms Friday night, mainly in SC, although we left rain chances at about 10 percent or less for now due to low confidence. Lows Friday night will be above normal in the mid to upper 70s most spots with lower 80s near the coast.

Saturday: The front looks to be closer to the area so despite a bit more cloud cover to start it should be another hot day with highs in the mid to upper 90s most inland spots, possibly touching 100 degrees, especially in GA. Heat indices could once again near 115 degrees in spots just inland from the beaches but should at least reach Heat Advisory levels most areas. Some more shortwave energy aloft and the pinned sea breeze could be enough to spark off isolated to scattered showers/storms mostly later in the day. A few of these storms could become severe. Storms will wind down later Saturday night with lows mainly in the upper 70s inland.

Sunday: The pattern is about the same although the mid level troughing is a bit weaker which should lead to a bit better rain chances, especially later in the day once the sluggish sea breeze gets going. Heat indices could once again reach 110 degrees for some areas so additional Heat Advisories will be possible.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. Forecast confidence: Moderate.

Deep troughing should prevail keeping the weather more unsettled and cooler than normal. Some periods of heavy rain are possible.

AVIATION /00Z FRIDAY THROUGH TUESDAY/. VFR.

Extended Aviation Outlook: High confidence in mostly VFR conditions at KCHS/KJZI/KSAV through early Sunday afternoon although some restrictions will be possible late Saturday due to showers/storms. There looks to be a greater risk for restrictions from periodic showers/storms starting Sunday night as deeper moisture move into the area.

MARINE. Tonight: South to southwest winds will pick up to 10-15 kt overnight in response to lee-side troughing that develops well to the west. Seas will average 1-2 ft.

Friday through Tuesday: Moderate confidence this period. Atlantic high pressure will prevail with a stalled front inland. Winds could get near Small Craft Advisory levels at times, especially Friday afternoon/evening near the Charleston County coast.

CHS WATCHES/WARNINGS/ADVISORIES. GA . Excessive Heat Watch from Friday afternoon through Friday evening for GAZ117-119-139-141. Heat Advisory from 1 PM to 7 PM EDT Friday for GAZ101-116-118- 137-138-140. SC . Excessive Heat Watch from Friday afternoon through Friday evening for SCZ044-045-048>052. Heat Advisory from 1 PM to 7 PM EDT Friday for SCZ042-043-047. MARINE . None.



NEAR TERM . ETM SHORT TERM . RJB LONG TERM . RJB AVIATION . ETM/RJB MARINE . JRL/RJB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 13 mi48 min S 12 G 13 83°F 1016.1 hPa (+0.0)
ACXS1 - ACE Basin Reserve, SC 18 mi63 min SSE 1 84°F 1016 hPa77°F
41033 27 mi40 min SSE 12 G 16 83°F 86°F1014.9 hPa
41029 - Capers Nearshore (CAP 2) 30 mi40 min S 9.7 G 16 83°F 84°F1015.1 hPa
41065 30 mi60 min 83°F2 ft
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi38 min S 5.8 G 7.8 82°F 85°F1015.8 hPa74°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi53 minSSE 710.00 miFair82°F77°F84%1015.6 hPa
Charleston, Charleston Air Force Base, SC23 mi52 minS 910.00 miFair83°F74°F74%1015.2 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmW3CalmCalmCalmCalmCalmCalmNE3NE5CalmSE7S10SE6SE54SE6S6S6
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CalmS7CalmCalmCalmCalmSW3W9W6NW5W5W5NW4NW3N53E4CalmE5
2 days agoS5S5SE4SE10
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S4CalmCalmCalmE4S9E6SW4CalmCalmSE4SE6SE5SE9SE64SE5

Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
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Thu -- 12:47 AM EDT     5.81 feet High Tide
Thu -- 06:32 AM EDT     Sunrise
Thu -- 06:45 AM EDT     0.29 feet Low Tide
Thu -- 12:00 PM EDT     Moonset
Thu -- 01:14 PM EDT     5.50 feet High Tide
Thu -- 07:04 PM EDT     0.85 feet Low Tide
Thu -- 08:20 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.65.85.34.22.81.50.50.30.923.24.35.15.55.34.53.42.21.30.81.123.14.1

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Thu -- 12:53 AM EDT     -0.00 knots Slack
Thu -- 04:11 AM EDT     -2.14 knots Max Ebb
Thu -- 06:31 AM EDT     Sunrise
Thu -- 07:20 AM EDT     0.00 knots Slack
Thu -- 09:35 AM EDT     1.42 knots Max Flood
Thu -- 11:59 AM EDT     Moonset
Thu -- 01:20 PM EDT     -0.00 knots Slack
Thu -- 04:37 PM EDT     -1.85 knots Max Ebb
Thu -- 07:48 PM EDT     0.00 knots Slack
Thu -- 08:19 PM EDT     Sunset
Thu -- 09:58 PM EDT     1.19 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.7-0.1-1-1.7-2.1-1.9-1.2-0.30.61.31.41.20.90.3-0.5-1.3-1.7-1.8-1.4-0.70.20.91.21

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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