Thursday, August6, 2020
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Marine Weather and Tides
Atlantic Beach, 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 6:30AMSunset 8:12PM Thursday August 6, 2020 9:35 PM EDT (01:35 UTC) Moonrise 9:18PMMoonset 8:10AM Illumination 90% 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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AMZ254 Coastal Waters From Little River Inlet To Murrells Inlet Sc Out 20 Nm- 630 Pm Edt Thu Aug 6 2020
Tonight..S winds 5 to 10 kt. Seas 2 to 3 ft. Isolated showers and tstms late.
Fri..S winds 5 to 10 kt. Seas 2 ft. Isolated showers and tstms in the morning.
Fri night..S winds 5 to 10 kt. Seas 2 ft. Isolated showers and tstms.
Sat..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sat night..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sun..W winds 5 kt, becoming S in the afternoon. Seas 2 ft. A chance of showers and tstms.
Sun night..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Mon..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Tue..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms. Winds and seas higher in and near tstms.
AMZ200 630 Pm Edt Thu Aug 6 2020
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. High pressure offshore and a piedmont trough inland will produce light to moderate winds through the weekend into early next week. Tstms will be possible each day and radar updates are encouraged.


7 Day Forecast for Marine Location Near Atlantic Beach, SC
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location: 33.81, -78.69     debug


Area Discussion for - Wilmington, NC
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FXUS62 KILM 062358 AFDILM

Area Forecast Discussion National Weather Service Wilmington NC 758 PM EDT Thu Aug 6 2020

SYNOPSIS. High pressure offshore and a weak trough of low pressure stalled across the inland Carolinas will maintain warm and humid conditions with scattered showers and thunderstorms through the middle of next week.

UPDATE/.

The primary change this update was reduction in pop values, as absence of forcing, and loss of heating brings quieting over land zones. A few showers or a TSTM could run ashore into the Cape Fear region after 4am, although the majority of models maintain the bulk of convection over water, scraping across Cape Lookout instead. So, here is the plan, low pops near the coast in the wee hours, and far interior associated with MCS energy late night and overnight period. Even with plentiful debris clouds, patches of mist can be expected late, especially along and near interior river basins.

NEAR TERM /THROUGH FRIDAY NIGHT/. Tonight into Fri should be similar to today, with another active day of Friday. Mid to upper trough will shift eastward and then lift northward and flatten out a bit by Sat morning, as a shortwave rides across the Northeast CONUS Fri and offshore by Sat morning. Overall, expect plenty of moisture to continue to flow up from the Gulf, with pcp water values up around 2 inches or so, along with steeper lapse rates enhanced by upper trough shifting eastward closer to our area. Should see some convection moving onshore from waters through early morning hours on Fri and then convective development associated with sea breeze and trough inland, propagating along outflow boundaries and steering flow out of the S-SW which should push inland by early evening.

Max temps will reach the upper 80s most places but will be affected by cloud development and pcp. Overnight lows will be in the 70s.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/. Upper-trough and weak frontal boundary will both move eastward toward the Carolina coastline into Saturday. Coverage of afternoon storms on Saturday will be lower compared to previous days. Still expect typical summertime convection to fire along the sea breeze and inland hot spots. A weak shortwave could help with the initiation of these storms, but models have not consistently resolved this feature. A warm and humid air mass will continue to produce near normal or slightly above normal afternoon temperatures with above normal and steamy evenings.

LONG TERM /MONDAY THROUGH THURSDAY/. Once the upper-trough exits the region, there won't be much to get excited about in terms of organized thunderstorm development. We may see weak shortwaves bring enhanced afternoon development due to the mostly zonal pattern over the northern half of the country, but typical afternoon thunderstorms will be the mode of activity. An upper-ridge over the SW CONUS will hold the zonal pattern in place to the north and may allow some weak ridging to develop over the deep south. This would bring above normal temperatures to the area by early and middle of next week.

AVIATION /00Z FRIDAY THROUGH TUESDAY/. Quiet in early portion of TAF cycle and VFR, but after 9z patches of mist may bring MVFR visibility and ceilings until 14z. By afternoon convection will emerge, focused along the sea breeze, with stronger storms likely farther inland where the Piedmont trough will reside. It is expected that storms along the interior trough, will migrate east toward the coast late in the day, reaching the coastal zones after 22z-24z, and a few could be strong.

Extended Outlook . Weak troughing inland will result in isolated TSTMs over the weekend and early next week, although coverage will be isolated to scattered.

MARINE. Light southerly flow will continue through Fri night maintaining seas less than 3 ft. WNA model shows a SE swell around 8 seconds increasing up to 9 to 10 seconds tonight into Friday, mixing with shorter period wind waves out of the S-SW.

Typical summertime southerly winds around 10 knots will persist this weekend into early next week. Gradient field collapses significantly on Sunday and Monday after the passage of a hardly noticeable frontal boundary. This will keep winds near 5-10 knots with seas around 1-2 feet. Seas will generally be 2-3 feet with no significant swell through the early and middle portions of next week. The only notable threat for boaters will be the elevated thunderstorm chances each day, mainly late this week into Saturday.

ILM WATCHES/WARNINGS/ADVISORIES. SC . None. NC . Coastal Flood Advisory from 11 PM this evening to 3 AM EDT Friday for NCZ107. MARINE . None.



SYNOPSIS . ILM NEAR TERM . RGZ SHORT TERM . SHK LONG TERM . SHK AVIATION . IGB MARINE . RGZ/SHK


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41024 - Sunset Nearshore (SUN 2) 11 mi28 min S 9.7 G 14 82°F 83°F1017.2 hPa
41119 11 mi79 min 83°F2 ft
MROS1 - 8661070 - Springmaid Pier, SC 16 mi48 min 81°F
41108 36 mi36 min 82°F3 ft
NIWS1 - North Inlet-Winyah Bay Reserve, SC 41 mi51 min S 4.1 82°F 1016 hPa78°F
WLON7 49 mi48 min 80°F 84°F1017.2 hPa

Wind History for Springmaid Pier, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
North Myrtle Beach Grand Strand Airport, SC2 mi43 minSSW 810.00 miPartly Cloudy82°F78°F88%1016.9 hPa
Myrtle Beach International Airport, SC15 mi40 minS 1010.00 miMostly Cloudy81°F79°F94%1016.9 hPa
Conway Horry County Airport, SC23 mi41 minS 310.00 miFair77°F75°F94%1016.3 hPa

Link to 5 minute data for KCRE

Wind History from CRE (wind in knots)
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Last 24hrSE3SE4S6S5S6S5S5S4W9CalmNE4CalmSE3S6S8SW94
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1 day agoS10S9S11S8SW9S7S7S5S7S5E10
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W9W5SW4W555CalmS5S7S9S11S12S12SW12S14SW10S8S9

Tide / Current Tables for Myrtle Beach Airport, ICWW, South Carolina
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Myrtle Beach Airport
Click for Map
Thu -- 06:19 AM EDT     0.22 feet Low Tide
Thu -- 06:30 AM EDT     Sunrise
Thu -- 09:10 AM EDT     Moonset
Thu -- 11:49 AM EDT     2.88 feet High Tide
Thu -- 06:25 PM EDT     0.37 feet Low Tide
Thu -- 08:10 PM EDT     Sunset
Thu -- 10:17 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.332.51.81.10.60.20.30.91.72.32.72.92.72.31.71.20.70.40.511.72.42.9

Tide / Current Tables for Little River (town), ICWW, South Carolina
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Little River (town)
Click for Map
Thu -- 05:12 AM EDT     0.21 feet Low Tide
Thu -- 06:30 AM EDT     Sunrise
Thu -- 09:09 AM EDT     Moonset
Thu -- 10:53 AM EDT     4.31 feet High Tide
Thu -- 05:17 PM EDT     0.34 feet Low Tide
Thu -- 08:09 PM EDT     Sunset
Thu -- 10:17 PM EDT     Moonrise
Thu -- 11:16 PM EDT     4.76 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.53.72.61.50.60.20.51.42.53.44.14.343.42.51.60.80.40.51.42.53.64.34.7

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Wilmington, NC (21,6,7,8)
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Ground Weather Radar Station Wilmington, NC
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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.