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Marine Weather and Tides
Version 3.4 |
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. 5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds. |
| Sunrise 6:21AM | Sunset 8:23PM | Sunday July 23, 2017 4:45 AM EDT (08:45 UTC) | Moonrise 5:35AM | Moonset 7:41PM | Illumination 0% |  |
Marine Forecasts
EDIT (on/off) Help| AMZ256 Coastal Waters From Murrells Inlet To South Santee River Sc Out 20 Nm- 333 Am Edt Sun Jul 23 2017 .small craft exercise caution in effect through late tonight... Today..SW winds 10 to 15 kt with gusts up to 20 kt... Increasing to 15 to 20 kt with gusts up to 30 kt this afternoon. Seas 2 to 4 ft...building to 3 to 4 ft this afternoon. Tonight..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers and tstms. Mon..SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers and tstms. Mon night..SW winds 15 to 20 kt...diminishing to 10 to 15 kt after midnight. Seas 3 to 4 ft. Showers and tstms likely. Tue..SW winds 10 kt. Seas 2 to 3 ft. Showers and tstms likely. Tue night..SW winds 10 to 15 kt...diminishing to 10 kt after midnight. Seas 2 to 3 ft. A chance of showers and tstms. Wed..S winds 10 kt. Seas 2 ft. Showers and tstms likely through the day, then a chance of showers and tstms through the night. Thu..SW winds 10 kt. Seas 2 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. | AMZ200 333 Am Edt Sun Jul 23 2017 Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. Bermuda high pressure will remain off the coast through the middle of the week. A cold front will drop southeastward late Monday and stall across the eastern carolinas just inland from the coast Tuesday and Wednesday. |
7 Day Forecast for Marine Location Near Pawleys Island, SC
Hourly EDIT Helplocation: 33.45, -79.11 debug
Area Discussion for - Wilmington, NC
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus62 kilm 230711 afdilm area forecast discussion national weather service wilmington nc 311 am edt Sun jul 23 2017 Synopsis A heat advisory remains in effect today. A cold front will approach from the north and may slip into the area mid week before stalling and then dissipating during Thursday. Showers and thunderstorms with heavy rain will increase in coverage Monday through Wednesday and this will serve to knock down the heat although the high humidity will remain. Drier air may briefly work into the area Thursday, but the arrival of a stronger cold front will bring more thunderstorms by the weekend. Near term through tonight As of 300 am Sunday... Mid level pattern starts to change today as the 5h ridge weakens and is replaced by subtle 5h troughing. Minimal amount of mid level subsidence present yesterday is gone today while precipitable water values exceed 2.25 inches. Mid level forcing will be weak to non-existent with only a weak shortwave passing north of the area around peak heating. Main forcing today will be from diurnal heating and the sea breeze piedmont trough. Given a more favorable environment aloft anticipate some deeper convection along the sea breeze with slightly higher coverage across western areas, associated with the trough. Activity will be diurnally driven with storms weakening in the evening and dissipating within an hour or so of sunset. Nocturnal convection seems like a good bet overnight, although coverage is likely to be limited given a lack of forcing. Some of this activity may drift onshore and will carry a slight chc pop along the coast overnight. 00z GFS does show some weak pva pushing offshore late in the period but this could be feedback. The 18z version had the same feature but in a much stronger state. The latest canadian, ecmwf, and NAM do not have this feature. Temperatures will once again run above climo with highs ranging from lower 90s along the coast to mid 90s inland. Cannot rule out an isolated upper 90 degree reading in far western locations but these should be isolated. Continued southerly flow will maintain dew points in the low to mid 70s. This combination will push heat index values above 105 this afternoon and require continuation of the heat advisory. Temps well above climo will continue overnight with lingering debris cloud and southerly flow keeping lows in the mid to upper 70s. Short term Monday through Tuesday night As of 300 am Sunday... This forecast period will be marked by increasing shower and thunderstorm coverage. The hot ridge will have retrograded back to the southern plains while the bermuda ridge remains offshore and suppressed to our s. This will allow an east coast trough to dig which will coax a surface cold front slowly southward. The front should be in close proximity by tue morning and will likely stall overhead by wed. In addition, the piedmont trough is expected to be displaced further e. This scenario should allow for a likelihood of showers and thunderstorms. These thunderstorms will be enhanced by mid-level short wave troughs. Currently models are showing one of these upper level impulses will move across the area Mon afternoon and eve and another Tue afternoon and night. The later impulse may actually close off across the carolinas and linger. Rainfall rates should be very high given precipitable water values will be on the order of 2.25 inches or higher for much of the period. Excessive rainfall is certainly possible given slow storm motions and the expectation that cells will train along the front. Rainfall amounts could easily reach 2 to 3 inches across a majority of the area during this time with more rainfall possible on Wed as well. The clouds and widespread and significant rainfall will knock down high temps, but the high humidity will remain. Highs both days will be around 90, averaging just above 90 on Mon and just below 90 on tue. Heat index values will be in the 100 to 105 degree range Mon and around 100 tue. Lows will be in the muggy lower to mid 70s. Long term Wednesday through Saturday As of 300 pm Saturday... The upper air pattern will transition to a cooler pattern for the eastern u.S. Next week. The upper ridge will retrograde to the four corners region by Saturday. A downstream trough will develop along the east coast, enhanced by a shortwave that almost cuts off across the carolinas mid week, and a progressive shortwave that moves through new england Friday. |
At the surface, low pressure should sink down to coastal south carolina by Wednesday night. This will drag a weak cold front down from the north. While yesterday's ECMWF kept the front across central north carolina, today's run is in agreement with the GFS that the front will sink all the way down into the charleston, sc area. With low-level convergence focused along the front and cooler upper-air conditions with the disturbance aloft, expect thunderstorms to be fairly widespread into wed. There is the potential we'll see 1-3 inches of rain area-wide. As the upper disturbance kicks offshore Thursday afternoon and drier mid-level air bleeds in from the west, the surface front should dissipate. Friday should be the warmest day in the extended period with highs popping back into the lower 90s and heat indices over 100 degrees again. By Saturday, the GFS and ecmwf are in surprisingly good agreement that a stronger cold front will dive southward and into area, with another enhancement in the potential of thunderstorms. Aviation 06z Sunday through Thursday As of 06z...VFR conditions will dominate the period with brief period of MVFR or even ifr possible from afternoon and evening showers and thunderstorms. Both the sea breeze and the piedmont trough should be more active than in past days but coverage will still be limited. Storm coverage and activity will diminish quickly with the loss of heating as the Sun sets. Bermuda high will maintain southerly flow through the valid TAF period. Sea breeze will bring gusts to coastal sites with potential for speeds in excess of 20 kt from the southeast. Speeds tonight will be around 10 kt, preventing any significant fog development. Extended outlook... Possible MVFR from patchy stratus near sunrise mon. Brief MVFR ifr possible in showers and thunderstorms Mon thru thu. Marine Near term through tonight ... as of 300 am Sunday... Pinched gradient this afternoon and evening will push speeds to 15 to 20 kt with potential for solid 20 kt at times. Prolonged and increasing south to southwest flow will help build seas to 3 to 5 ft with widespread 5 ft likely well away from shore. Will maintain inherited scec for all zones for today continuing into the overnight hours. Short term Monday through Tuesday night ... as of 300 am Sunday... A cold front will sag south and be in close proximity Tue and may stall overhead Tue night or wed. The eastward displaced piedmont trough will serve to keep a rather tight pressure gradient in place and this will keep sustained southwest winds near 20 kt Mon and Mon eve. As the cold front gains proximity late Mon night and through the remainder of the period, wind speeds will decrease to no higher than 10 to 15 kt with 10 kt or less by late Tue night as the wind direction becomes variable. Seas will be 4 to 5 ft through the first half of the forecast period, subsiding to 3 ft or less during tue and Tue night. Thunderstorms will be increasing across the waters during this time and mariners should expect poor visibility in very heavy rain along with locally higher winds and seas. Long term Wednesday through Thursday ... as of 300 pm Saturday... A cold front will become increasingly ill-defined on Wednesday, and by Thursday afternoon should wash out as southwesterly winds increase ahead of a stronger front that should affect the area next weekend. Ilm watches warnings advisories Sc... Heat advisory from 11 am this morning to 7 pm edt this evening for scz017-023-024-032-033-039-053>056. Nc... Heat advisory from 11 am this morning to 7 pm edt this evening for ncz087-096-099-105>110. Marine... None. Near term... Iii short term... Rjd long term... Tra aviation... Iii |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| NIWS1 - North Inlet-Winyah Bay Reserve, SC | 8 mi | 61 min | SW 8 | 80°F | 1013 hPa | 77°F | ||
| MROS1 - 8661070 - Springmaid Pier, SC | 18 mi | 46 min | 1012.3 hPa (-0.8) | |||||
| SSBN7 | 43 mi | 106 min | 2 ft | |||||
| 41024 - Sunset Nearshore (SUN 2) | 43 mi | 38 min | WSW 12 G 16 | 80°F | 79°F | 1012.7 hPa |
Wind History for Springmaid Pier, SC
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Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Georgetown County Airport , SC | 15 mi | 51 min | SW 7 | 10.00 mi | Fair | 77°F | 77°F | 100% | 1013.9 hPa |
| Myrtle Beach Air Force Base, SC | 19 mi | 50 min | SW 6 | 10.00 mi | Fair | 80°F | 75°F | 85% | 1013.4 hPa |
Wind History from GGE (wind in knots)
| 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | |
| Last 24hr | Calm | Calm | Calm | SW | SW | SW | SW | SW | SW | SW | S G15 | S | SW | S G15 | S | S | SW | SW | SW | SW | SW | SW | SW | SW |
| 1 day ago | Calm | SW | Calm | W | W | SW | SW | S | S | S | S | S | S | S | SW | SW | SW | SW | Calm | Calm | Calm | Calm | Calm | Calm |
| 2 days ago | Calm | W | Calm | W | W | W | W | SW | Calm | SE | S | S | S | S | S | S | SW | SW | Calm | Calm | SW | SW | Calm | Calm |
Tide / Current Tables for Midway Inlet North, Pawleys Island, South Carolina
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Midway Inlet North Click for Map Sun -- 02:52 AM EDT -0.43 feet Low Tide Sun -- 05:47 AM EDT New Moon Sun -- 06:22 AM EDT Sunrise Sun -- 06:34 AM EDT Moonrise Sun -- 08:30 AM EDT 4.71 feet High Tide Sun -- 02:59 PM EDT -0.88 feet Low Tide Sun -- 08:22 PM EDT Sunset Sun -- 08:40 PM EDT Moonset Sun -- 08:57 PM EDT 5.77 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 2.1 | 0.8 | -0.1 | -0.4 | 0.2 | 1.4 | 2.8 | 3.9 | 4.6 | 4.6 | 4.1 | 3.1 | 1.8 | 0.5 | -0.5 | -0.9 | -0.3 | 1.1 | 2.8 | 4.3 | 5.4 | 5.8 | 5.4 | 4.5 |
Tide / Current Tables for Allston Creek, South Carolina
EDIT (on/off) Help One Week of Data| Allston Creek Click for Map Sun -- 03:42 AM EDT -0.41 feet Low Tide Sun -- 05:47 AM EDT New Moon Sun -- 06:22 AM EDT Sunrise Sun -- 06:34 AM EDT Moonrise Sun -- 09:06 AM EDT 4.54 feet High Tide Sun -- 03:49 PM EDT -0.84 feet Low Tide Sun -- 08:22 PM EDT Sunset Sun -- 08:40 PM EDT Moonset Sun -- 09:33 PM EDT 5.57 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 3 | 1.7 | 0.5 | -0.2 | -0.4 | 0.4 | 1.7 | 3 | 4.1 | 4.5 | 4.3 | 3.6 | 2.6 | 1.4 | 0.2 | -0.6 | -0.8 | -0.1 | 1.5 | 3.1 | 4.6 | 5.4 | 5.5 | 5 |
Weather Map and Satellite Images
(on/off) HelpWeather Map | IR Satellite Image from GEOS GOES Local Image of Southeast EDIT  |
Wind Forecast for Wilmington, NC (4,6,7,8)
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Ground Weather Radar Station Wilmington, NC
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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. |