Tuesday, July7, 2020
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Marine Weather and Tides
Hollywood, 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 6:17AMSunset 8:32PM Tuesday July 7, 2020 5:28 AM EDT (09:28 UTC) Moonrise 9:47PMMoonset 7:33AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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- 317 Am Edt Tue Jul 7 2020
Today..S winds 10 to 15 kt. Showers. A slight chance of tstms this morning, then tstms this afternoon.
Tonight..S winds 10 to 15 kt. Showers and tstms likely.
Wed..SW winds 5 to 10 kt. Showers and tstms.
Wed night..SW winds 5 to 10 kt, becoming W after midnight. Showers and tstms likely, mainly in the evening.
Thu..W winds 5 to 10 kt. A chance of showers and tstms in the morning, then showers and tstms likely in the afternoon.
Thu night..W winds 5 to 10 kt. Showers and tstms likely, mainly in the evening.
Fri..SW winds 5 to 10 kt. A chance of showers and tstms.
Fri night..SW winds 5 to 10 kt. A slight chance of showers and tstms.
Sat..SW winds 5 to 10 kt. A chance of showers and tstms.
Sat night..SW winds 5 to 10 kt. A 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 85 degrees.
AMZ300 317 Am Edt Tue Jul 7 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. An area of low pressure will slowly move across the southeast through the middle of the week, before lifting north late week into the weekend. A stationary front will then linger in the vicinity early next week.


7 Day Forecast for Marine Location Near Hollywood, SC
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location: 32.73, -80.07     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 070803 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 403 AM EDT Tue Jul 7 2020

SYNOPSIS. An area of low pressure will slowly move across the Southeast through the middle of the week, before lifting north late week into the weekend. A stationary front will then linger in the vicinity early next week.

NEAR TERM /THROUGH TONIGHT/. Today: A stationary front will meander near or just outside the forecast counties, as a wave of low pressure meanders in central Georgia this morning, then drifts toward the Savannah River this afternoon. This pattern occurs in tandem with broad mid level troughing that covers the region. These features will provide the focus for numerous to widespread showers/t-storms throughout the day.

Deep and rich tropical moisture will prevail with PWat close to 2.5 inches, which is some 2-3 standard deviations above climo, and close to the highest that can be achieved throughout the year. Combine this abundance of moisture with short wave energy moving in aloft, upper difluence and strong low level convergence, allowing for a wet and unsettled day.

For early this morning we'll see two separate bands of convection that will occur; the first will be over interior Georgia in closer proximity to the low and mid level energy; the other will be over the Charleston quad-county region, where the best low level convergence will be found. Instability is somewhat minimal, so only isolated t-storms are expected. Given the high moisture content and the SPC Precipitation Potential Placement of 2-2.5 suggests a risk for locally heavy rains. Fortunately we're in the low tide cycle early this morning. But the high tide in Charleston is around 10-130 am, and this could be a concern since there could be heavier rains ongoing during this time.

The first convective band will reach near and north of the Santee River by late morning in association with a strong short wave passes through. Additional convective pulses will also occur closer to the center of the surface low over the rest of the South Carolina zones and in Georgia. There could even be a second and larger band forming as shown by the HRRR that develops near the Savannah River and lifts northeast across South Carolina after 12Z.

Then for the afternoon, decent instability and CAPE will favor additional rounds of additional convection, resulting from the proximity to the surface low and stationary front. We considered hoisting a Flash Flood Watch, but after viewing the HREF and WPC 6 hourly QPF values, they don't support significant and widespread flooding problems. Instead, locally heavy rains will occur, resulting in the potential for Flash Flood Advisories.

Even so, rainfall amounts will reach a solid 1-2 inches over many communities, although locally higher amounts will occur, and we could be close to record rainfall for today, especially at KCHS and maybe at KCXM. (see CLIMATE section below).

Temps will be held down throughout the day, and there is an outside chance that we could end up close to the record low maximum of 81F set in 1979 at KCHS. On average we're anticipating lower and middle 80s throughout, with some upper 80s from Savannah south.

Tonight: The surface low rides along the stationary front and slips through South Carolina to the east, reaching very close to Berkeley and Dorchester County by dawn on Wednesday. Mid level impulses shifting through within a continued broad trough aloft will allow for additional showers and t-storms to continue. However, there is some decrease in the deepest moisture after midnight, as the warm conveyor belt shifts into the Atlantic. As a result we are showing a slowly diminishing trend of PoP from west-southwest to east-northeast through the night. While low stratus will be prominent, any reduction in surface visibilities is not enough to include mention of fog in the forecast. Min temps will be similar to this morning, down in the lower and middle 70s.

SHORT TERM /WEDNESDAY THROUGH FRIDAY/. Broad low pressure will meander over or near the area on Wednesday, before slowly drifting offshore Wednesday night. With the low in the vicinity and deep moisture (noted by PWats of ~2.25 inches) in place, another active convective day is expected. The forecast currently features rain chances peaking in the 70-80% range. The threat for severe weather is low, but cannot rule out localized flooding where heavier downpours occur. Isolated to scattered showers could linger into the first portions of Wednesday night, but activity will largely wane as the low moves east. With clouds and rain around, high temperatures will be a few degrees below normal in the mid to upper 80s. Lows Wednesday night will be in the low to mid 70s.

The surface low will likely be at a position near the North Carolina coast on Thursday, with a trailing boundary extending south into or near the area. Shortwave energy will aid in bringing another round of showers and thunderstorms to the area, although coverage is not expected to be quite as high as on Wednesday. It appears to be most active across the the northern zones and that is where we have the highest rain chances. Further south, models vary in coverage. However with the continued moist airmass in place, we maintained PoPs 40-50% in those locations. Temperatures will be moderate closer to normal.

The front/trough axis will linger in the area on Friday as the low makes steadier northward progress up the mid-Atlantic coast. We will start to transition to a more typical diurnal convective scheme, with scattered showers and thunderstorms possible in the afternoon/evening. Highs will be near normal in the low to mid 90s.

LONG TERM /FRIDAY NIGHT THROUGH MONDAY/. Mid level troughing will persist over the eastern CONUS through early next week. At the surface, a trough of low pressure will prevail. Scattered showers and thunderstorms will be possible each day, mainly in the afternoon and evenings when instability is maximized. Temperatures will be seasonable.

AVIATION /07Z TUESDAY THROUGH SATURDAY/. KCHS: Unsettled, wet weather with impact the terminal through 06Z Wednesday, with temporary flight restrictions this morning to transition to prevailing flight restrictions late this morning into tonight. This will be the result of a stationary front nearby, and the proximity to a surface low that is over central Georgia early this morning, crosses the Savannah River and into central South Carolina late today and tonight. While occasional IFR can occur, MVFR seems more likely at this time. The risk for TSRA is low to moderate, but since we are uncertain on the timing, we have opted not to include with the latest TAF set.

KSAV: A stationary front will stay north of the terminal through the 06Z TAF forecast period, as a surface low tracks off to the west-northwest today, then to the north tonight. One band of RA/-RA will impact the site with occasional MVFR conditions early this morning, before rainfall transitions into more convective activity late this morning into early tonight. Timing of any SHRA and TSRA is too low to show anything more than VCSH and VCTS with the latest TAF. Keep in mind that any direct impacts would result in temporary MVFR or potentially IFR conditions.

Extended Aviation Outlook: Flight restrictions are likely at times through midweek as low pressure passes over the region. Brief flight restrictions are then possible late week in mainly afternoon/evening showers and thunderstorms.

MARINE. Today and tonight: Weak low pressure will travel slowly eastward across Georgia and into South Carolina, driven by a stationary front aligned roughly east-west. There is a modest gradient that prevails around the low, leading to mainly S or SW winds as high as 15 kt today, and up to 15 or 20 kt tonight. Not enough for an advisory, but higher than average for this time of year. Seas of 2-3 ft today will build another foot or so tonight. mariners are alerted to numerous or potentially widespread showers and t-storms that will occur through the period. Some of these will result in heavy rains reducing visibilities and frequent lightning strikes. At the present time any risk for wind gusts in excess of 30 kt due to convection is minimal.

Wednesday through Sunday: Low pressure will slowly pass over the region mid week, before lifting to the north late week into the weekend. Marine conditions are expected to stay below Small Craft Advisory criteria through the period.

CLIMATE. Record Rainfall for July 7th . KCHS . 1.90 inches set in 1950. KCXM . 2.67 inches set in 1950. KSAV . 3.28 inches set in 1979.

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

NEAR TERM . SHORT TERM . ETM LONG TERM . ETM AVIATION . MARINE . CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 9 mi58 min SSW 1.9 G 4.1 80°F 85°F1016.1 hPa
FBIS1 - Folly Island, SC 10 mi88 min S 8.9 G 11 81°F 1016.6 hPa (-1.1)
41029 - Capers Nearshore (CAP 2) 24 mi80 min SSW 7.8 G 12 82°F 83°F1016 hPa
ACXS1 - ACE Basin Reserve, SC 24 mi103 min SSE 1 74°F 1016 hPa73°F
41033 36 mi80 min SW 12 G 19 81°F 83°F1015.4 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi38 min SSW 9.7 G 12 82°F 83°F3 ft1016.2 hPa74°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC4 mi33 minW 66.00 miLight Drizzle75°F75°F100%1015.9 hPa
Charleston, Charleston Air Force Base, SC13 mi92 minN 08.00 miLight Rain75°F73°F96%1015.9 hPa
Mount Pleasant Regional-Faison Field, SC19 mi33 minN 03.00 miFog/Mist75°F75°F100%1015.9 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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1 day agoCalmCalmCalmSE35E3SE5E8E7SE7E8E10E7
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2 days agoNW4CalmNW3NW4N5N5NW45S7SE7SE8S8S7S6S6S5S5S3CalmCalmCalmCalmCalmCalm

Tide / Current Tables for Church Creek bridge, Wadmalaw River, South Carolina
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Church Creek bridge
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Tue -- 12:10 AM EDT     8.12 feet High Tide
Tue -- 05:20 AM EDT     0.01 feet Low Tide
Tue -- 06:19 AM EDT     Sunrise
Tue -- 08:33 AM EDT     Moonset
Tue -- 12:25 PM EDT     6.37 feet High Tide
Tue -- 05:20 PM EDT     0.04 feet Low Tide
Tue -- 08:31 PM EDT     Sunset
Tue -- 10:46 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.17.763.71.40.10.21.12.43.74.95.86.36.253.11.30.10.21.12.54.15.56.7

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Tue -- 01:49 AM EDT     -2.79 knots Max Ebb
Tue -- 04:56 AM EDT     0.00 knots Slack
Tue -- 06:18 AM EDT     Sunrise
Tue -- 06:59 AM EDT     1.47 knots Max Flood
Tue -- 08:32 AM EDT     Moonset
Tue -- 10:45 AM EDT     -0.00 knots Slack
Tue -- 01:59 PM EDT     -2.11 knots Max Ebb
Tue -- 05:00 PM EDT     0.00 knots Slack
Tue -- 07:26 PM EDT     1.56 knots Max Flood
Tue -- 08:30 PM EDT     Sunset
Tue -- 10:45 PM EDT     Moonrise
Tue -- 11:22 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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-1.6-2.5-2.8-2.2-1.20.11.11.51.310.6-0.2-1.1-1.8-2.1-1.8-1-00.91.51.51.31.10.4

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 (5,6,7,8)
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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.