Friday, April10, 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 6:53AMSunset 7:47PM Friday April 10, 2020 2:22 PM EDT (18:22 UTC) Moonrise 10:01PMMoonset 7:55AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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- 1247 Pm Edt Fri Apr 10 2020
.small craft advisory in effect until 5 pm edt this afternoon...
This afternoon..NW winds 15 to 20 kt with gusts to 25 kt.
Tonight..NW winds 10 to 15 kt with gusts to 20 kt, becoming N 5 to 10 kt after midnight.
Sat..NE winds 5 to 10 kt, becoming se in the afternoon.
Sat night..S winds 10 to 15 kt.
Sun..SE winds 15 to 20 kt with gusts to 30 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.
Sun night..S winds 20 to 25 kt with gusts to 35 kt. Waves 2 to 3 ft. Showers likely with a chance of tstms.
Mon..SW winds 20 to 25 kt. Waves 2 to 3 ft. Showers likely with a chance of tstms.
Mon night..W winds 10 to 15 kt.
Tue..NE winds 10 kt.
Tue night..NE winds 5 to 10 kt. A chance of showers. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 70 degrees.
AMZ300 1247 Pm Edt Fri Apr 10 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build over the area through Saturday. A warm front will lift north Saturday night, then a cold front will move through Monday morning. High pressure will briefly rebuild early next week before a coastal low pressure system moves through mid 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 101653 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1253 PM EDT Fri Apr 10 2020

SYNOPSIS. High pressure will build over the area through Saturday. A warm front will lift north Saturday night, then a cold front will move through Monday morning. High pressure will briefly rebuild early next week before a coastal low pressure system moves through mid week.

NEAR TERM /THROUGH TONIGHT/. High pressure will continue to expand into the region today. Aloft, mid level trough axis and associated shortwave will slide off the East coast. Dry conditions will prevail with mostly clear skies through the remainder of the afternoon. Northwest winds will be fairly gusty with gusts in the 20-25 mph range common. Temperatures will be much cooler than yesterday, mainly in the upper 60s to low 70s. Main changes with the early afternoon update was to hourly dew point trends and winds. Otherwise, ongoing forecast was in good shape.

Tonight: The center of high pressure will slide eastward across the Tennessee Valley and into the western Carolinas. Winds will shift around from northerly to become more northeasterly with time. We should see decent radiational cooling conditions, and lows are forecast to be much cooler than recent overnight periods. Temperatures are expected to bottom out around 40 inland, ranging to the mid to upper 40s along the coast. There is some low end potential for frost well inland, but current thinking is that dewpoints will be too low. No frost is mentioned in the forecast and the probability is too low to include in the Hazardous Weather Outlook.

SHORT TERM /SATURDAY THROUGH MONDAY/. Cool and dry high pressure will persist through Saturday with sunny skies and high temps in the 70s. The surface high will move offshore late Saturday while upper shortwave energy approaches from the west. A warm front will lift north into our southeast GA zones late Saturday night, then through the remainder of the area Sunday. Moisture and isentropic ascent will increase from south to north from late Saturday night into Sunday. Most of the guidance is in general agreement that a shortwave will move through the area shortly after daybreak Sunday, providing an additional source of lift. Numerous showers are expected to develop over the area on Sunday with the greatest coverage inland. Scattered thunderstorms will be increasingly likely during the day as Lifted Indices eventually go negative.

Low-level helicity and shear increase along and south of the warm front Sunday morning. However, there will likely be extensive cloud cover during the day, along with the potential for stabilizing rains in the morning. It doesn't appear that enough instability will develop to support a significant severe weather threat on Sunday, especially since the greatest upper forcing will be during the morning. The low-level wind fields will be ramping up on Sunday with 850 mb winds out of the south around 40 kt by Sunday afternoon. Relatively deep mixing will result in breezy to windy conditions on Sunday.

A bit of a lull in precipitation is possible Sunday evening into the overnight hours as most of the forcing pushes north of the area along with the warm front. A potent, albeit weakening upper shortwave will move into the area late Sunday night, pushing a cold front through the area Monday mid-morning. A broken line of strong to severe thunderstorms could move through the area during this time. The timing is unfavorable climatologically, however very strong low-level theta-e advection could yield CAPEs of 500-1,000 J/kg, accompanying 50-70 kt of bulk shear and 0-3 km helicity values of 500-600 m2/s2. 850 mb winds will be quite impressive at 60-70 kt, thus even if no severe weather occurs, breezy conditions will exist through the night.

Showers and tstms associated with the cold front will gradually move off the coast on Monday. Downslope flow behind the front will push high temps into the low 80s Monday.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. A series of high pressure systems will move through the central and eastern United States through the period. A coastal low could move up the coast Tuesday night and Wednesday, bringing numerous showers to the area.

AVIATION /18Z FRIDAY THROUGH WEDNESDAY/. VFR will prevail through 18z Saturday. Gusty northwest winds this afternoon will subside by sunset.

Extended Aviation Outlook: Periodic flight restrictions Sunday into midday Monday as numerous showers and tstms affect the area. Strong winds anticipated Sunday into Monday.

MARINE. Today: Elevated northwest winds are expected into the afternoon behind a departing cold front. Winds should generally top out in the 15-20 knot range, but a few gusts to 25 knots will be possible in the Charleston County waters and the outer Georgia waters. Gusts to 25 knots in and around the Charleston Harbor should be more frequent so a Small Craft Advisory will remain in effect through 5 pm. Seas should generally average 2-4 feet, but could be up to 5 feet in the outer waters at times.

Tonight: High pressure will become centered north of the local waters overnight and winds will shift around to more northerly and even northeasterly late. Wind speeds should top out in the 10-15 knot range for the most part. Seas are expected to average 1-3 feet.

Small Craft Advisories will likely be needed Sunday into Monday or Monday night as strong southerly flow precedes a cold front, then seas gradually subside behind the front. Gales may be needed for some of the waters Sunday night into Monday morning when the strongest winds impact the waters.

FIRE WEATHER. Relative humidity values are expected to fall into the 20-25 percent range inland, and the 25-30 percent range closer to the coast this afternoon with frequent northwest wind gusts into the 20-25 mph range. The best combination of low relative humidity and breezy conditions will be late this morning through early this afternoon. We have opted for a Fire Danger Statement for all of southeast Georgia and southeast South Carolina for today given these meteorological conditions and drying fine fuels.

TIDES/COASTAL FLOODING. Offshore winds are expected to reduce tidal departures through the day. The Friday evening high tide will likely peak right around 7 feet MLLW in Charleston Harbor, and a Coastal Flood Advisory could be needed. It seems less likely that Fort Pulaski will approach or reach 9.2 feet MLLW.

Higher than normal tides are expected the next several days due to astronomical influences from the full moon and perigee. Additionally, winds are forecast to be onshore Saturday into Sunday, which could further elevate the tides. As a result, minor coastal flooding is expected with the evening high tides through the weekend and perhaps into Monday.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 5 PM EDT this afternoon for AMZ330.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 13 mi83 min NW 9.9 G 16 69°F 1009.9 hPa (+0.0)40°F
CHTS1 16 mi53 min N 11 G 17 71°F 70°F1009.9 hPa
ACXS1 - ACE Basin Reserve, SC 18 mi98 min WNW 5.1 70°F 1010 hPa36°F
41033 27 mi75 min NW 14 G 19 67°F 69°F1009.5 hPa
41029 - Capers Nearshore (CAP 2) 30 mi75 min N 14 G 23 66°F 68°F1008.9 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi43 min 12 G 14 65°F 71°F1009.2 hPa47°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi28 minN 139.00 miFair70°F39°F33%1009.8 hPa
Charleston, Charleston Air Force Base, SC23 mi87 minNNW 14 G 2010.00 miPartly Cloudy70°F37°F30%1009.6 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
Click for Map
Fri -- 04:41 AM EDT     -0.66 feet Low Tide
Fri -- 06:56 AM EDT     Sunrise
Fri -- 08:54 AM EDT     Moonset
Fri -- 10:56 AM EDT     6.08 feet High Tide
Fri -- 04:51 PM EDT     -0.57 feet Low Tide
Fri -- 07:47 PM EDT     Sunset
Fri -- 11:01 PM EDT     Moonrise
Fri -- 11:29 PM EDT     7.03 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.34.72.70.9-0.4-0.60.21.73.44.85.86.15.64.32.71-0.2-0.60.11.53.34.96.26.9

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Fri -- 02:03 AM EDT     -3.41 knots Max Ebb
Fri -- 05:07 AM EDT     0.00 knots Slack
Fri -- 06:55 AM EDT     Sunrise
Fri -- 07:27 AM EDT     2.11 knots Max Flood
Fri -- 08:53 AM EDT     Moonset
Fri -- 11:07 AM EDT     -0.00 knots Slack
Fri -- 02:16 PM EDT     -2.80 knots Max Ebb
Fri -- 05:16 PM EDT     0.00 knots Slack
Fri -- 07:46 PM EDT     Sunset
Fri -- 07:54 PM EDT     2.11 knots Max Flood
Fri -- 11:00 PM EDT     Moonrise
Fri -- 11:45 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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-1.6-2.9-3.4-2.9-1.7-0.21.2221.71.10.2-1.1-2.2-2.8-2.6-1.6-0.40.91.82.11.91.60.9

Weather Map
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wmap_A
GEOS Local Image of Southeast    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (14,3,4,5)
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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.