Monday, January18, 2021
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Marine Weather and Tides
Conway, SC

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 5:34PM Monday January 18, 2021 9:11 PM EST (02:11 UTC) Moonrise 10:56AMMoonset 11:07PM Illumination 31% Phase: Waxing Crescent; Moon at 6 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- 619 Pm Est Mon Jan 18 2021
.small craft advisory in effect until 10 pm est this evening...
Tonight..W winds 15 to 25 kt, becoming nw 10 to 15 kt after 10 pm. Seas 3 to 4 ft.
Tue..NW winds 5 to 10 kt, becoming sw 10 to 15 kt in the afternoon. Seas 2 ft.
Tue night..SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft.
Wed..W winds 15 to 20 kt, becoming nw 10 to 15 kt in the afternoon. Seas 2 to 3 ft.
Wed night..NW winds 5 to 10 kt. Seas 2 ft.
Thu..SW winds 5 to 10 kt, increasing to 15 to 20 kt in the afternoon. Seas 2 ft, building to 3 to 4 ft in the afternoon.
Thu night..W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers.
Fri..NW winds 5 to 10 kt, becoming n. Seas 3 to 4 ft. A chance of showers.
Sat..N winds 10 to 15 kt. Seas 2 to 3 ft.
AMZ200 619 Pm Est Mon Jan 18 2021
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. High pressure along the gulf coast will extend across the area tonight and Tuesday, resulting in winds temporarily diminishing. Winds will increase again Tuesday afternoon and night, due to the approach of a cold front. The cold front will move across the local waters and offshore Tuesday night. Another cold front will drop down from the northwest and could bring rain late Thursday into Friday, prior to its crossing. Moderate high pressure will build in from the nw to start the weekend.


7 Day Forecast for Marine Location Near Conway, SC
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location: 33.84, -79.04     debug


Area Discussion for - Wilmington, NC
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FXUS62 KILM 182218 AFDILM

Area Forecast Discussion National Weather Service Wilmington NC 518 PM EST Mon Jan 18 2021

SYNOPSIS. Seasonable temperatures, dry and occasionally breezy conditions will continue into mid week as a series of cold fronts cross the coast. A warming trend will follow as high pressure over the Southeast states moves offshore. Rain chances increase late this week as a weak frontal boundary sets up over the area. Cooling and drying is currently slated for next weekend.

UPDATE/.

No changes of note this update, forecast remains un-derailed.

NEAR TERM /THROUGH TUESDAY NIGHT/. Any leftover stratocu this aftn should dissipate by sunset. Otherwise, upper flow will become more westerly and southern stream oriented with occasional cirrus reaching the FA late tonight and continuing thruout Tue thru Tue night. Mixing from aloft is aiding the wind gusts over 20+ this aftn but as we head thru dusk and into the evening, look for the gusts to diminish as well as the the overall winds in general. Ridging from sfc high over the FL/GA region will extend NE across the Eastern Carolinas later tonight then slide off the coasts during Tue. NW Winds during the pre-dawn Tue hrs will have a chance to decouple allowing min temps to drop to around 30 inland, with low to mid 30s at the immediate coast. A mid- level s/w trof dropping SE during Tue, will slide off the Carolina Coasts early Wed morning. This will help drive a dry CFP across the ILM CWA during the pre-dawn Wed hrs. Moisture avbl will come with the cold front itself along with mid-level dynamics associated with the trof. Will see mid levels clouds during Tue night with low level stratocu accompanying the CFP not entirely out of the question. Max temps Tue should reach mid to possibly upper 50s due to WAA occurring ahead of the cold front. Min temps Tue night/Wed morning will be tricky with much of it riding on the time of the CFP and just how much CAA is able to infiltrate the FA.

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/. Dry and breezy conditions Wednesday with brief surface high pressure moving in from the west. Westerly winds and clear skies will allow temps to reach mid to upper 50s. Scattered high clouds and lows in the mid 30s Wednesday night. Stream of moisture from the west moves in Thursday, with continued breezy conditions and cloudy skies. Rain chances increase from west to east Thursday afternoon, with best moisture and rain chances to the south. With zonal flow aloft, a west to east front sets up across the area late Thursday. Clouds and light precip will keep temps in the mid 50s Thursday and mid to upper 40s Thursday night.

LONG TERM /FRIDAY THROUGH MONDAY/. West to east boundary across the area early Friday will slowly move southward during the day into Friday night as high pressure builds over the Central US. Light rain Friday will clear from north to south by Friday night, with rain chances lower for northern counties Friday. Gradient of rain and clouds may make Friday temps interesting. Current forecast has highs in the upper 50s Friday, but could see that being less across NE SC depending on cloud cover. As high pressure builds in for the weekend, and upper level ridging develops into Sunday, cold advection sets in and weekend temps forecasted slightly below normal. Low pressure approaching from the west Monday could increase rain chances for beginning of next week.

AVIATION /22Z MONDAY THROUGH SATURDAY/.

VFR, mainly SKC, a few high clouds above 20 thousand feet. A diminishing W-WNW wind overnight 5 knots or less, becoming SW Tuesday afternoon 8-12 knots, highest at coastal terminals.

Extended Outlook . MVFR conditions are expected along with a low probability of IFR conditions late Thursday night into Friday as a wave of low pressure brings rain to the area.

MARINE. Through Tuesday Night . The tightened sfc pg will continue into the evening, however the CAA will become neutral by dusk via various thickness schemes. This will result in westerly winds (frequent 25 kt gusts) diminishing below SCA thresholds by mid- evening at the latest. Center of sfc high pressure over GA/FL will ridge NE along the coastal Carolinas tonight into Tue, resulting in the sfc pg further relaxing. The local waters can expect W or NW (depending on the sfc ridge axis location) winds diminishing to around 10 kt late tonight thru Tue daytime morning. Progressive flow sfc and aloft will drive the next sfc cold front southeastward toward the local waters late Tue and across the waters and offshore Tue night. The sfc pg will slightly tighten ahead of the cold front resulting with increasing SW- WSW winds Tue aftn. The tightened pg will be better realized Tue night prior to and after the CFP with windspeeds reaching SCA thresholds in gusts. CAA surge after FROPA will further aid the 25+ kt gustiness going into daylight Wed. Significant seas will be dominated by wind driven 2 to 4 second periods nearshore and 3 to 6 second periods outer waters to 20 nm out. Any 6 footers that occur will be brief and off the outer waters off Cape Fear. Wednesday through Saturday . Breezy west winds Wednesday morning, with gusts of 20-25 kts, will weaken during the day to 10-15 kts and become northwesterly. 2-4 ft seas early will diminish to 1-2 ft by Wednesday night. Southwest winds develop Thursday and increase in speed 15-20 kts Thursday afternoon through overnight hours. Frequent gusts near 25 kts Thursday night could lead to another brief SCA period. 2-3 ft seas early Thursday will be increasing during the day, with 3-6 ft seas forecasted for Thursday night. A west to east boundary across the area late Thursday will be dropping south Friday through Friday night, with 10 kt west winds early Friday veering to northerly by Friday night through Saturday around 10-15 kts. 2-4 ft seas Friday through Saturday. Wind waves dominate the wave spectrum for Wednesday through Saturday.

ILM WATCHES/WARNINGS/ADVISORIES. SC . None. NC . None. MARINE . Small Craft Advisory until 10 PM EST this evening for AMZ250- 252-254.



SYNOPSIS . ILM UPDATE . Colby NEAR TERM . DCH SHORT TERM . VAO LONG TERM . VAO AVIATION . MJC MARINE . DCH/VAO


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MROS1 - 8661070 - Springmaid Pier, SC 14 mi54 min 48°F
41024 - Sunset Nearshore (SUN 2) 30 mi64 min WNW 5.8 G 9.7 46°F 53°F1021 hPa
NIWS1 - North Inlet-Winyah Bay Reserve, SC 35 mi87 min WNW 1.9 45°F 1021 hPa30°F

Wind History for Springmaid Pier, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Conway Horry County Airport, SC4 mi17 minN 010.00 miFair34°F32°F93%1021.7 hPa
Myrtle Beach International Airport, SC12 mi16 minWSW 510.00 miFair45°F28°F52%1021.9 hPa
North Myrtle Beach Grand Strand Airport, SC17 mi19 minN 010.00 miFair38°F33°F83%1021.3 hPa

Link to 5 minute data for KHYW

Wind History from HYW (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmSW3SW3SW4SW3SW3SW5SW6SW6
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1 day agoSW6W4CalmSW3CalmCalmCalmCalmCalm----------W9W6W7
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2 days agoCalmCalmCalmCalmCalmCalmSW4CalmSW3----SW5SW5SW9
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Tide / Current Tables for Conway, RR. bridge, Waccamaw River, South Carolina
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Conway
Click for Map
Mon -- 12:40 AM EST     0.07 feet Low Tide
Mon -- 06:43 AM EST     1.18 feet High Tide
Mon -- 07:20 AM EST     Sunrise
Mon -- 10:55 AM EST     Moonrise
Mon -- 12:52 PM EST     0.25 feet Low Tide
Mon -- 05:33 PM EST     Sunset
Mon -- 07:07 PM EST     1.24 feet High Tide
Mon -- 11:06 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.10.20.50.811.11.21.10.90.70.50.30.30.30.60.811.21.21.210.80.5

Tide / Current Tables for Keysfield, Waccamaw River, South Carolina
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Keysfield
Click for Map
Mon -- 05:33 AM EST     1.32 feet High Tide
Mon -- 07:19 AM EST     Sunrise
Mon -- 10:55 AM EST     Moonrise
Mon -- 11:44 AM EST     0.30 feet Low Tide
Mon -- 05:33 PM EST     Sunset
Mon -- 05:57 PM EST     1.38 feet High Tide
Mon -- 11:07 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.30.60.91.11.31.31.210.70.50.30.30.40.70.91.21.31.41.31.10.90.60.3

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

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Ground Weather Radar Station




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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.