Wednesday, January22, 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 7:18AMSunset 5:43PM Wednesday January 22, 2020 9:27 AM EST (14:27 UTC) Moonrise 5:32AMMoonset 3:46PM Illumination 7% Phase: Waning Crescent; Moon at 27 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- 537 Am Est Wed Jan 22 2020
.small craft advisory in effect until 5 pm est this afternoon...
Today..N winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft.
Tonight..NE winds 10 to 15 kt with gusts to 20 kt.
Thu..NE winds 10 kt.
Thu night..NE winds 5 to 10 kt. A slight chance of showers in the evening, then a chance of showers after midnight.
Fri..SE winds 5 to 10 kt. A chance of showers in the morning, then showers likely in the afternoon.
Fri night..SW winds 10 kt, becoming W after midnight. Showers likely, mainly in the evening.
Sat..W winds 10 kt.
Sat night..W winds 10 kt.
Sun..W winds 5 to 10 kt.
Sun night..NW winds 5 to 10 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 54 degrees.
AMZ300 537 Am Est Wed Jan 22 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build across the area from the north today before weakening in advance of a storm system that will impact the region Friday. High pressure will return late weekend, then persist into the middle of 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 221234 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 734 AM EST Wed Jan 22 2020

SYNOPSIS. High pressure will build across the area from the north today before weakening in advance of a storm system that will impact the region Friday. High pressure will return late weekend, then persist into the middle of next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Adjusted hourly temperatures to reflect a slightly warmer start. The forecast is on track otherwise.

Today: The deep upper trough that has been responsible for this brief but intense cold snap will steadily loosen its grip on the region today as it shifts farther offshore into the Atlantic. Mid-level heights will rise through the day as H5 ridging takes hold in the wake of the trough and low-level thicknesses correspondingly rise. Although weak, low-level warm air advection will persist with H8 temperatures rising about 2C between 22/12z and 23/00z, a gusty north to northeast wind will help keep temperatures down a bit with afternoon highs only expected to reach into the lower 50s for most locations. Some of the higher resolution guidance members suggest some spots may not breach the 50 degree mark, but these look to initialize a bit too cold based on early morning hourly temperatures. Some adjustments to the temperature forecast will likely be needed as the day progresses and short term thermal trends become more apparent.

Otherwise, sunny skies this morning will way to some cirrus that is already spreading east ahead of the next storm system. Gusty winds will gradually diminish this afternoon as the pressure gradient between the high pressure to the north and low pressure developing well east of Florida slowly weakens.

SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY/. Tonight: High pressure will maintain its influence tonight. Some guidance is rather aggressive in the development of precipitation over the coastal waters after midnight, but this looks too aggressive west of the Gulf Stream given the high condensation pressure deficits and dry resident airmass that are forecast to remain in place. Any isentropic assent that develops along the 290K isosurface in response to a backing of the 925-850 hPa mean wind should go towards a thickening of a mid-level cloud deck along parts of the Georgia and far southern South Carolina coasts in lieu of the generation of hydrometeors. A rain-free forecast will be maintained with lows ranging from the lower 30s inland to the lower 40s along the beaches; warmest along the Georgia coast where the marine-influence will be the greatest in a north-northeast flow regime.

Thursday: High pressure will remain somewhat wedged across the area through much of the afternoon, but will begin to weaken as a coastal trough develops along the Southeast Coast by nightfall. Northeast winds and clouds through peak diurnal heating should limit overall high temps to the mid 50s. As the coastal trough begins to take better form late, a few showers could shift onshore, but the bulk of precip activity will likely increase after midnight when the coastal trough begins to lift north as a warm front well ahead of a low pressure system approaching from the west. Given the passing warm front, overnight lows will remain considerably warmer than the previous night. In general, lows should range in the mid/upper 40s inland to lower 50s near the coast.

Friday: A coastal trough will lift north of the area early in advance of a low pressure system quickly approaching the region from the west. Southerly flow will prevail through much of the day, helping advect moisture and warmer temps ahead of a cold front approaching western zones mid-late afternoon. In general, temps should peak in the low/mid 60s before the onset of precip associated with the front. Numerous to potentially widespread showers should track across the area late afternoon into the early overnight period, then quickly shift offshore by midnight as dry high pressure builds in wake of the departing cold front. Overnight lows should dip into the low/mid 40s post fropa.

Saturday: Dry high pressure will spread across the region along the southern edge of a large mid-lvl trough centered over the Midwest. Temps will be cooler within a west wind, ranging in the upper 50s inland to around 60 degrees closer to the coast and south of I-16. These sfc temps along with some cold air advection aloft should help produce sufficient mixing into 30-40 kt low-lvl wind fields, thus favoring 15-20 mph westerly sfc winds during peak heating hours.

LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/. Dry sfc high pressure will spread across the Southeast United States late weekend along the southern edge of a large mid-lvl trough of low pressure extending across much of the Midwest to Northeast states. The pattern will support slightly cooler conditions across the area late weekend into early next week as northeast winds prevail within high pressure that becomes centered across the Mid- Atlantic states. However, winds should turn more onshore Wednesday as the high shifts offshore in advance of a low pressure system approaching the East Conus during the middle of next week. Onshore winds in combination with a fairly large ridge of high pressure building aloft should support a warming trend midweek.

In general, high temps should range in the upper 50s/lower 60s Saturday through Monday, then warm into the middle/upper 60s by Wednesday. Overnight lows should dip into the middle/upper 30s inland to lower 40s near the coast Saturday night through Monday night, then remain in the upper 40s/lower 50s by Wednesday night.

AVIATION /13Z WEDNESDAY THROUGH SUNDAY/. VFR with gusty winds continuing at both KCHS and KSAV.

Extended Aviation Outlook: VFR conditions are expected at both KCHS and KSAV terminals Thursday. Flight restrictions are possible Friday and Friday night due to showers and low clouds associated with a passing cold front. VFR conditions are then expected to return at both terminals by daybreak Saturday and persist through Sunday.

MARINE. Downgraded the Gale Warnings to Small Craft Advisories for the Georgia and far southern South Carolina nearshore zones.

Through Tonight: Gale Warnings remain in force for all legs except Charleston Harbor where a Small Craft Advisory is valid. Gusts to 35 kt will be common across the waters this morning with winds dropping below Gale Warning criteria nearshore legs later this morning, except early this afternoon for Charleston County waters and Georgia offshore waters this evening. The Gale Warning may fall just short of criteria for the Georgia nearshore leg with frequent gusts at 41008 and Fripp Nearshore holding just short of 35 kt. Will hold on the warning for now, but it may be downgraded to a Small Craft Advisory for this area earlier than expected. Seas 3-8 ft nearshore waters and 9-13 ft over the Georgia offshore leg will subside to 3-7 ft nearshore and 8-10 ft Georgia offshore leg overnight.

Thursday through Sunday: Small Craft Advisory conditions could be ongoing across a portion of the coastal waters Thursday morning while north-northeast winds persist between high pressure inland and a coastal trough beginning to develop off the Georgia and Florida coasts. In general wind speeds should peak between 20-25 kt while seas range between 4-6 ft across nearshore waters and 6-9 ft across offshore Georgia waters. The pressure gradient will begin to relax across all waters Thursday afternoon, likely putting an end to Small Craft Advisory level conditions across nearshore waters. Further offshore, 5-7 ft seas should linger through the weekend as the coastal trough lifts north across the area Thursday night into early Friday before a low pressure system approaches the coast from the west with a cold a front that shifts across coastal waters Friday night into early Saturday. Southerly winds should top out in the 15- 20 kt ahead of the front, then turn west-northwest behind the front for the remainder of the weekend. High pressure will then build across the region through Sunday, favoring winds/seas that remain below Small Craft Advisory levels across all waters.

TIDES/COASTAL FLOODING. Tide levels reached 7.12 ft MLLW in Charleston Harbor with this morning's high tide. The Coastal Flood Advisory will be allowed to expire at 8 AM.

Strong high pressure to the north and low pressure offshore will maintain elevated north/northeast winds through mid week which could push tide levels slightly above Coastal Flood Advisory thresholds during the morning high tides, especially near Charleston Thursday morning.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . Lake Wind Advisory until 11 AM EST this morning for SCZ045. MARINE . Small Craft Advisory until 4 PM EST Thursday for AMZ352-354. Gale Warning until 1 PM EST this afternoon for AMZ350. Gale Warning until 7 PM EST this evening for AMZ374. Small Craft Advisory until 5 PM EST this afternoon for AMZ330.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 9 mi57 min 39°F 53°F1026.7 hPa
FBIS1 - Folly Island, SC 10 mi87 min N 15 G 19 35°F 1026.3 hPa (+1.8)26°F
41029 - Capers Nearshore (CAP 2) 24 mi79 min ENE 25 G 31 37°F 55°F1026.5 hPa
ACXS1 - ACE Basin Reserve, SC 24 mi162 min N 4.1 32°F 1026 hPa19°F
41033 36 mi79 min NE 23 G 31 37°F 55°F1025.7 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi37 min 29 G 37 70°F1023.4 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC4 mi32 minN 0 G 149.00 miFair36°F23°F60%1025.7 hPa
Charleston, Charleston Air Force Base, SC13 mi91 minNNE 10 G 1710.00 miFair32°F19°F59%1026.5 hPa
Mount Pleasant Regional-Faison Field, SC19 mi32 minN 9 G 1510.00 miFair36°F21°F56%1026.1 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Tide / Current Tables for Church Creek bridge, Wadmalaw River, South Carolina
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Church Creek bridge
Click for Map
Wed -- 12:31 AM EST     -0.34 feet Low Tide
Wed -- 05:32 AM EST     Moonrise
Wed -- 07:20 AM EST     Sunrise
Wed -- 08:07 AM EST     7.59 feet High Tide
Wed -- 01:16 PM EST     0.01 feet Low Tide
Wed -- 03:46 PM EST     Moonset
Wed -- 05:43 PM EST     Sunset
Wed -- 08:17 PM EST     6.07 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-0.20.51.83.34.86.27.27.67.15.53.41.20.10.21.12.23.54.75.665.84.62.7

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 12:09 AM EST     0.00 knots Slack
Wed -- 04:06 AM EST     1.53 knots Max Flood
Wed -- 05:31 AM EST     Moonrise
Wed -- 06:43 AM EST     -0.00 knots Slack
Wed -- 07:19 AM EST     Sunrise
Wed -- 09:44 AM EST     -2.62 knots Max Ebb
Wed -- 12:47 PM EST     0.00 knots Slack
Wed -- 02:44 PM EST     1.30 knots Max Flood
Wed -- 03:45 PM EST     Moonset
Wed -- 05:42 PM EST     Sunset
Wed -- 06:40 PM EST     -0.00 knots Slack
Wed -- 09:58 PM EST     -2.16 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.20.91.41.51.51.40.7-0.3-1.5-2.4-2.6-2-10.31.11.31.110.5-0.3-1.1-1.8-2.2-1.8

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 (9,2,3,4)
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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.