Friday, August7, 2020
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Marine Weather and Tides
Jacksonboro, 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 6:36AMSunset 8:13PM Friday August 7, 2020 8:17 PM EDT (00:17 UTC) Moonrise 9:53PMMoonset 9:14AM Illumination 84% Phase: Waning Gibbous; Moon at 19 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 648 Pm Edt Fri Aug 7 2020
Tonight..S winds 10 to 15 kt, becoming sw late. Seas 2 to 3 ft. A slight chance of showers and tstms this evening.
Sat..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms in the afternoon.
Sat night..S winds 10 kt. Seas 2 ft. A slight chance of showers and tstms after midnight.
Sun..SW winds 5 to 10 kt, becoming S in the afternoon. Seas 2 ft. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Sun night..S winds 10 kt. Seas 2 ft. A chance of showers. A chance of tstms, mainly in the evening.
Mon..SW winds 5 to 10 kt, becoming S in the afternoon. Seas 2 ft. A chance of tstms. A chance of showers.
Mon night..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Tue..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Tue night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Wed..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Wed night..S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 648 Pm Edt Fri Aug 7 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A stationary front will linger to the west through the weekend before dissipating. The region will then be positioned between atlantic high pressure centered offshore and an inland area of broad low pressure.


7 Day Forecast for Marine Location Near Jacksonboro, SC
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location: 32.63, -80.47     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 072320 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 720 PM EDT Fri Aug 7 2020

SYNOPSIS. A stationary front will linger to the west through the weekend before dissipating. The region will then be positioned between Atlantic high pressure centered offshore and an inland area of broad low pressure.

NEAR TERM /THROUGH SATURDAY/. Convection will take longer than is typical to fade tonight, given short wave energy aloft and various meso-scale boundaries that will have sufficient instability and lift to go along with plentiful moisture (given PWat in excess of 2 inches). We anticipate storms early tonight could be locally strong given DCAPE greater than 800 J/kg over our northwest tier, plus locally heavy rains can also occur given slow storm motion and good moisture transport.

We have PoP as high as 50-60% through mid evening, trending down to 30-40% by midnight, with still as much as 20-30% thereafter. After about 9 pm the best chances for showers and t-storms will be over north and northwest counties, in closer proximity to the stationary front and where upstream activity will move in with the short wave aloft.

Min temperatures will be in the low to mid 70s further inland and upper 70s along the coast.

SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/. Saturday: It is possible that a few remnant showers from this evening's convection over the Midlands will linger until the daylight hours Saturday. However, HREF indicates that convection, if any remains, will be very light. The forecast will generally focus on the formation of the sea breeze during the late morning hours, drifting inland during the afternoon and evening. Given the combination of deep moisture, moderate instability, and a sea breeze, PoPs are forecast to peak between 40-50 percent during the afternoon. High temperatures are forecast to range from the low 90s across the SC Lowcountry to the mid 90s across SE GA. Heat index values across the SE GA coastal counties may peak around 105 degrees Saturday afternoon. Saturday night, near term models indicate that the axis of a H5 trough will approach from the west. Weak forcing associated with the trough is expected to arrive Saturday night, a few showers and thunderstorms may develop and persist over the waters. Low temperatures are forecast to range in the mid to upper 70s.

Sunday and Monday: The axis of a H5 trough will slowly ripple over the region. Forecast soundings indicate slightly cooler mid-level temps and steeper lapse rates. Given lingering moisture, scattered to numerous thunderstorms are expected each afternoon and evening across the forecast area, especially across SE GA. High temperatures and heat index values should not vary by more than a couple of degrees from the values on Saturday.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. The mid-level weakness is forecast to amplify by mid-week, possibly briefly cutting off over central South Carolina and Georgia as weak shortwave ridging develops to its north and a pronounced shortwave passes north over the Ohio Valley and Mid-Atlantic. This should help increase the amount of showers/tstms each afternoon within a ribbon of tropical moisture (PWATS at or above 2.25") with rain chances lingering through the night. Pops 50-60% Tuesday will increase to 60- 70% both Wednesday and Thursday when the weakness/upper low makes its closest approach. Highs are expected to top out in the lower-mid 90s Tuesday, then lower into the upper 80s/lower 90s by mid-week as afternoon heating will be limited by numerous showers/tstms. Isolated strong tstms will be possible and there will be a risk for localized flooding, especially in low-lying and poor drainage areas. Lows will range from the lower-mid 70s inland with upper 70s/lower 80s at the coast and Downtown Charleston, although daily lows could be augmented at times by convective influences.

AVIATION /00Z SATURDAY THROUGH WEDNESDAY/. The 00Z TAF set for KCHS and KSAV shows prevailing VFR through the entire period, but there are a three concerns for potential flight restrictions. It's just that the chances of any of these occurrences are too low to include at this time.

First will be the chance of upstream SHRA/TSRA perhaps reaching the KCHS terminal between 04Z and 08Z associated with a short wave.

Second, there could be temporary MVFR ceilings at KCHS even if convection doesn't occur, given the HREF probabilities of 40-60% from about 04Z to 10Z.

Finally, there will be the potential for afternoon/evening convection associated with the sea breeze and various other meso-scale boundaries. This could result in sub-VFR weather after 18Z Saturday. However, this far in advance it is not worth showing anything more than VCTS and CB clouds at both sites.

Extended Aviation Outlook: Tstm impacts possible each afternoon/evening. There will be a risk for marine-based stratocumulus establishing MVFR cigs each night, mainly at KCHS.

MARINE. Tonight: Between Atlantic high pressure and an inland stationary front, winds will remain southerly as high as 12-17 kt through the night, with seas generally 2-3 feet. A few of the t-storms could still produce gusty winds and heavy rainfall.

Saturday through Tuesday: The sfc pattern will feature high pressure centered over the western Atlantic and broad low pressure inland. This pattern should generally support south winds between 10 to 15 kt and seas between 1-2 ft. The formation of land breeze circulations will be possible during early morning hours resulting in a light westerly wind around sunrise. This feature could be a focus for waterspouts during mid-late morning hours for the next several days.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . None.

NEAR TERM . SHORT TERM . NED LONG TERM . AVIATION . MARINE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 5 mi92 min SSE 1 85°F 1019 hPa79°F
41033 24 mi69 min WSW 16 G 23 84°F 86°F1018 hPa
CHTS1 31 mi47 min S 8 G 12 84°F 87°F1017.9 hPa
FBIS1 - Folly Island, SC 31 mi77 min S 15 G 17 84°F 1019.1 hPa (+0.6)
41029 - Capers Nearshore (CAP 2) 46 mi69 min S 14 G 19 83°F 85°F1018.4 hPa
FPKG1 - 8670870 - Fort Pulaski, GA 47 mi47 min SW 6 G 8 80°F 86°F1018.3 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Beaufort, Marine Corps Air Station, SC17 mi21 minSSW 610.00 miFair83°F73°F74%1017.5 hPa
Beaufort County Airport, SC17 mi22 minSW 65.00 miPartly Cloudy with Haze81°F73°F79%1017.6 hPa
Walterboro Lowcountry Regional Airport, SC22 mi42 minSSW 810.00 miThunderstorm in Vicinity81°F75°F84%1017.6 hPa

Link to 5 minute data for KARW

Wind History from ARW (wind in knots)
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Last 24hrSW5CalmW5CalmCalmCalmW3CalmCalmCalmCalmCalmCalmCalmS4CalmSE4SE5S7SE7S8
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1 day agoCalmCalmCalmS4S6S6S4S4S3CalmCalmSW3CalmS4SW7S9S9S5SE8SW4S7SE5S4S6
2 days agoSE4CalmS5S5S6S3S3CalmCalmCalmCalmCalmCalmW3S4CalmS7S8S6S8S9
G15
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Tide / Current Tables for Airy Hall Plantation, Ashepoo River, South Carolina
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Airy Hall Plantation
Click for Map
Fri -- 01:01 AM EDT     4.34 feet High Tide
Fri -- 06:40 AM EDT     Sunrise
Fri -- 07:24 AM EDT     0.32 feet Low Tide
Fri -- 10:13 AM EDT     Moonset
Fri -- 01:20 PM EDT     3.99 feet High Tide
Fri -- 07:31 PM EDT     0.79 feet Low Tide
Fri -- 08:13 PM EDT     Sunset
Fri -- 10:52 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.14.34.13.62.81.80.90.40.41.122.93.643.93.52.82.11.30.90.91.32.12.9

Tide / Current Tables for Fenwick Island, South Carolina
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Fenwick Island
Click for Map
Fri -- 05:50 AM EDT     0.35 feet Low Tide
Fri -- 06:40 AM EDT     Sunrise
Fri -- 10:13 AM EDT     Moonset
Fri -- 11:38 AM EDT     5.99 feet High Tide
Fri -- 05:57 PM EDT     0.86 feet Low Tide
Fri -- 08:13 PM EDT     Sunset
Fri -- 10:51 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.45.74.63.21.70.70.412.33.85.15.965.54.53.42.21.20.91.32.53.855.9

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (20,4,5,8)
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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.