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Marine Weather and Tides Kiawah Island, SC Version 3.4

NOTICE 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

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Sunrise 6:48AM

Sunset 7:55PM

Sunday August 25, 2019 11:18 AM EDT (15:18 UTC)

Moonrise 12:34AM

Moonset 3:01PM

Illumination 24%

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.

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7 Day Forecast for Marine Location Near Kiawah Island, SC

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Area Discussion for - Charleston, SC

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Fxus62 kchs 251445 afdchs area forecast discussion national weather service charleston sc 1045 am edt Sun aug 25 2019 Synopsis High pressure will prevail inland, while a stationary front lingers south and east of the area early this week. Meanwhile, low pressure is expected to pass well off the southeast coast. A cold front will impact the region later in the week. Near term through tonight Morning update: temperatures and dew points were running several degrees lower than forecasted across most of the area. This is probably due to the front being further to our south. We plugged in the observations and have temperatures slower to warm this afternoon. Much will depend on how quickly or slowly the clouds dissipate, allowing the strength of the late august sun to warm the temperatures. We also trended the dew points lower through tonight. Previous discussions... for the early morning update we trimmed back the chance of showers over land to nothing higher than 20% for this afternoon, mainly near the altamaha river and maybe northern charleston county. Since there are such low ceilings this morning, there could be a few sprinkles in spots. Although the most recent rap and hrrr do show temps a bit higher than our latest forecast, since temps are starting out a bit cooler than those models are showing, we have maintained our MAX temps forecast as previously, which will be hint of autumn with values a good 3-6f below normal. Meanwhile, recent satellite images do show deeper convection developing in association with the trough over the atlantic off to the southeast of the forecast zones. This could be start of better organization to that feature that is still anticipated to develop into a tropical or sub-tropical depression. Today: the cold front will push south of the altamaha river early this morning, as a strong 1030 mb high in maine wedges into the southeast, and eventually pushes the front to near the florida-georgia border during the daylight hours. This is rather unusual for late august, as a high pressure wedge is more common in the cooler months of the year across our area. Meanwhile, a trough of low pressure that has had a difficult time in getting organized and is situated off the east coast of florida, will eventually become a closed and tropical-like low as it lifts northeast and reaches a position several hundred miles offshore of the northeast florida and southeast coast by nightfall. The forecast problem of the day is regarding MAX temps, since considerable cloudiness will dominate given abundant moisture trapped underneath a low level inversion. This will curtail the amount of insolation throughout the day, suggesting that it'll be noticeably "cooler" than the past 3-4 weeks. But since it is still summer, and any breaks of sunshine or brightening of the skies could easily boost temps quickly, we stayed close to the rap and hrrr guidance which has highs of 80-84f. There isn't much prospects for rainfall to occur, but we do have slight chance pop's over the coastal corridor where there is enough low level moisture convergence, and also south of i-16 in georgia where the highest low level theta-e air is found. Tonight: the tropical low well off the southeast region continues to trek slowly northeast and parallel to the coast, steered by the stationary front over the atlantic. As this occurs it causes the inland wedge to become reinforced, which leads to a rather comfortable night for late august. Lows will make it down into the upper 60s and lower 70s most places. Any lingering isolated diurnal convection will end in the evening, although a few coastal showers could persist until after midnight as some moisture wrapping around the offshore low advects toward the coast. Short term Monday through Wednesday A stalled front will be positioned to the east and south on Monday, which will keep a tropical low well offshore as it tracks up the southeast coast. Meanwhile, surface high pressure axis will extend down from the north inland. Models continue to focus precip across far southeast georgia, and that is where highest pops reside. Areas north of the savannah river should see a dry day. It will be the coolest day of the set, with highs topping out a few degrees below normal, mainly in the mid 80s. Lows Monday night are forecast to range from the upper 60s near 70 in the northwest tier to low mid 70s south. The wedge-like pattern will erode on Tuesday as the stalled front attempts to lift back north. Aloft, mid level troughing will swing into the area. Shortwave energy and 2+ inch pwats will support a

more active day, especially across the southern zones where 60% rain chances are featured. Temperatures should return to more seasonable norms. On Wednesday, a cold front is expected to approach the area from the west. There are some model differences on timing of the frontal progression, so confidence isn't as high on convective coverage. Current pop forecast features 40-50%. Temperatures again near normal. Long term Wednesday night through Saturday A cold front is expected to pass offshore Wednesday night or Thursday which will then linger in the vicinity through late week as high pressure builds in from the west. Models vary in regards to timing of frontal passage, with the euro the quicker solution. This makes for a lower confidence rainfall forecast as rain chances will hinge on frontal position. Overall, went with consensus pops of around 40% during the daytime hours. Temperatures will be seasonable. Aviation 15z Sunday through Thursday In the wake of a cold font, a strong high pressure wedge will maintain a low level inversion that traps considerable moisture underneath. MVFR ceilings are forecasted early this afternoon, followed byVFR ceilings. Our confidence on exactly when this will happen is no more than moderate, so adjustments could be required in later forecasts. Also, kchs is positioned between the wedge of high pressure to the west and a possible developing low near the gulf stream. This will create a decent pressure gradient, resulting in occasional gusty NE winds during the day. Extended aviation outlook: brief flight restrictions will be possible with showers thunderstorms Tuesday through Thursday. Marine Today and tonight: a strong wedge of high pressure will persist inland, while a trough of low pressure off the florida east coast today, could finally develop into a tropical or sub- tropical depression tonight, as it travels northeast around 300 miles off the coast of the south carolina and georgia. A rather tight pressure gradient between the inland high and the coastal trough low will lead to NE winds as high as 20-25 kt on the amz350 waters, and 15-20 kt and gusty elsewhere. Seas will be as high as 4 or 5 ft throughout. For now we have just one small craft advisory on the charleston county atlantic waters, but depending upon the strength of the developing low, we might need additional advisories on some of the other waters at a later time. Monday through Friday: marine conditions will be improving on Monday as the pressure gradient relaxes as low pressure well offshore lifts away from the area. Northeast east winds Monday and Tuesday will gradually veer to a more offshore direction on Wednesday ahead of a cold front. The front is progged to cross the waters Thursday then linger in the vicinity through late week. At this time, winds and seas are expected to remain below small craft advisory criteria. Rip currents: since there still isn't much swell energy that is expected to reach the beaches today, we have maintained a low risk. However, with north-northeast breezes as high as 15 or 20 mph, a moderate to strong long shore current will prevail. Increasing east northeast winds could contribute to an enhanced risk of rip currents on area beaches early this week, especially if tropical low pressure intensifies while tracking well offshore. Tides coastal flooding Elevated tide levels are expected this week with the approach of the perigee and new moon, which occurs on Friday. Coastal flooding will be possible, mainly during the evening high tide cycles, starting Monday but more likely during the latter half of the week. In addition, there is the potential for some heavy rain around the times of high tide which could exacerbate any flooding issues. Chs watches warnings advisories Ga... None. Sc... None. Marine... Small craft advisory until 6 am edt Monday for amz350. Near term... short term... long term... aviation... marine... tides coastal flooding...

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
FBIS1 - Folly Island, SC	13 mi	78 min	N 11 G 12	70°F			1018 hPa (+1.5)	68°F
CHTS1	16 mi	48 min	NNW 9.9 G 13	73°F	85°F		1018 hPa
ACXS1 - ACE Basin Reserve, SC	18 mi	93 min	N 2.9	69°F			1018 hPa	68°F
41033	27 mi	70 min	NE 14 G 19	73°F	85°F		1017.4 hPa
41029 - Capers Nearshore (CAP 2)	30 mi	70 min	NNE 16 G 23	72°F	84°F		1017.5 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC	54 mi	38 min	NNE 19 G 23	78°F	83°F		1016.3 hPa	74°F

Wind History for Charleston, SC

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Charleston Executive Airport, SC	10 mi	43 min	N 8	8.00 mi	Overcast	72°F	66°F	83%	1018.3 hPa
Charleston, Charleston Air Force Base, SC	23 mi	82 min	N 8	10.00 mi	Overcast	69°F	64°F	87%	1017.7 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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Tide / Current Tables for Charleston Harbor, off Fort Sumter, South Carolina Current (expired 1996-12-31)

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Weather Map and Satellite Images

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GOES 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

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Wind Forecast for Charleston, SC (11,2,3,4)

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Ground Weather Radar Station Charleston, SC

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Disclaimer: 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 numerious 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.