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Marine Weather and Tides
Version 3.4 |
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. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
Sunrise 7:10AM | Sunset 5:09PM | Friday December 13, 2019 9:55 PM EST (02:55 UTC) | Moonrise 6:41PM | Moonset 8:29AM | Illumination 94% | ![]() |
AMZ254 Coastal Waters From Little River Inlet To Murrells Inlet Sc Out 20 Nm- 942 Pm Est Fri Dec 13 2019
.small craft advisory in effect through late Saturday night...
Overnight..N winds 10 kt, becoming sw 15 kt. Seas 4 to 5 ft. Patchy fog. A chance of rain late this evening. Rain likely late. Vsby 1 to 3 nm through early morning.
Sat..W winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Periods of rain in the morning.
Sat night..W winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Seas 4 to 6 ft, subsiding to 3 to 4 ft after midnight.
Sun..W winds 10 to 15 kt, becoming sw 10 kt in the afternoon. Seas 2 to 3 ft.
Sun night..SW winds 10 kt. Seas 2 ft.
Mon..S winds 10 kt, increasing to 10 to 15 kt. Seas 2 ft, building to 3 to 4 ft.
Tue..SW winds 10 to 15 kt, becoming nw 15 to 20 kt. Seas 3 to 4 ft. Showers likely.
Wed..N winds 15 to 20 kt. Seas 3 to 4 ft.
.small craft advisory in effect through late Saturday night...
Overnight..N winds 10 kt, becoming sw 15 kt. Seas 4 to 5 ft. Patchy fog. A chance of rain late this evening. Rain likely late. Vsby 1 to 3 nm through early morning.
Sat..W winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Periods of rain in the morning.
Sat night..W winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Seas 4 to 6 ft, subsiding to 3 to 4 ft after midnight.
Sun..W winds 10 to 15 kt, becoming sw 10 kt in the afternoon. Seas 2 to 3 ft.
Sun night..SW winds 10 kt. Seas 2 ft.
Mon..S winds 10 kt, increasing to 10 to 15 kt. Seas 2 ft, building to 3 to 4 ft.
Tue..SW winds 10 to 15 kt, becoming nw 15 to 20 kt. Seas 3 to 4 ft. Showers likely.
Wed..N winds 15 to 20 kt. Seas 3 to 4 ft.
AMZ200 942 Pm Est Fri Dec 13 2019
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles. Waves of low pressure along a front will bring rain, wind, and higher waves through Saturday morning. High pressure returns with improving conditions offshore Sunday into Monday. The next chances for unsettled weather is Tuesday with another approaching front.
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles. Waves of low pressure along a front will bring rain, wind, and higher waves through Saturday morning. High pressure returns with improving conditions offshore Sunday into Monday. The next chances for unsettled weather is Tuesday with another approaching front.
7 Day Forecast for Marine Location Near Red Hill, SC
Hourly EDIT Helplocation: 33.75, -79.07 debug
Area Discussion for - Wilmington, NC
  (on/off)  Help NOTE: mouseover dotted underlined text for definitionFXUS62 KILM 132328 AFDILM
Area Forecast Discussion National Weather Service Wilmington NC 628 PM EST Fri Dec 13 2019
SYNOPSIS. Periods of rain will continue through Saturday morning as waves of low pressure moving along a front across the Carolinas. High pressure will build in from the northwest late Saturday through Sunday. Southerly winds will bring warmer temperatures Monday and Tuesday, followed by increasing rain chances as another cold front crosses the area late Tuesday. Cold and dry weather will follow through the end of the week.
UPDATE. Major changes to many forecast elements on this early evening update. See Near Term section below for details.
NEAR TERM /THROUGH SATURDAY NIGHT/. A wave of low pressure moving north along a front stalled 30-50 miles off the coast brought heavy rainfall across the area this afternoon. Mesonet gauge totals through 645 PM have reached 1 inch on the south end of Wilmington, near Holden Beach in Brunswick County, and in Conway, SC. Farther inland heavier rain beginning earlier in the day has totaled over two inches in Hartsville and Darlington. A new daily record rainfall of 1.29 inches has already been established in Florence, with a little more on the way before midnight.
Rainfall should largely end across the area by late this evening as our first wave of low pressure moves out to the northeast. Low clouds will persist as the coastal front jumps onshore ahead of the next wave of low pressure currently moving across the Florida Panhandle. This second disturbance should take a more inland route, dragging the front almost as far inland as the I-95 corridor, and leading to a second wave of moderate rainfall late tonight into Saturday morning.
Temperatures are currently in the 40s inland to 50-55 along the coast. This has necessitated a large downward change to tonight's forecast lows by as much as 7 degrees in Georgetown and Kingstree. Temperatures should rise overnight as the front jumps inland, potentially into the 60s along the coast and well into the 50s inland, especially east of I-95.
After the upper level trough base swings across the Cape Fear Region late Saturday afternoon, pressure rises associated with incoming high pressure will bring a break in cloud cover and a return of dry weather.
SHORT TERM /SUNDAY/. In the mid-levels, heights show ridging increasing, but this ridge will be short-lived. At the surface, high-pressure along an axis from northern Florida to southern Minnesota will shift northeast of the area by late Sunday night. No precipitation in the period with no synoptic/mesoscale forcing and limited moistures. High temperatures Sunday will range from near 60 to the lower 60s. Low temperatures lower 40s inland to mid to upper 40s within 10 miles of the coast.
LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/. With the progressive pattern, a trough is present in the mid- levels in the lee of the Rockies on Monday, and by Wednesday the trough will shift to the east coast. The 12 UTC run of the 500 height shows the GFS is slightly faster but the ECMWF and GEFS are in closer agreement. At the surface the GEFS is much faster with the mean low just north of Pittsburgh and the ECMWF ensemble mean surface low near Louisville, Kentucky. Confidence in precipitation timing is a confidence issue.
The ECMWF ensemble 24-hour probabilities of > 0.50" of QPF around 20% to 30%, but > 0.10" probabilities are greater than 80%. The GEFS is a bit higher for > 0.50".
Ahead of the surface front, high temperatures will be in upper 60s Monday and near 70 on Tuesday. The low temperatures, Monday morning are in the lower to middle 40s and rising to the middle to upper 50s Tuesday morning. After the front a cooling trend is established with Highs in the 50s but lows will fall to freezing or just below Wednesday night and Thursday.
AVIATION /00Z SATURDAY THROUGH WEDNESDAY/. Rain showers continue to move northward as we approach the back edge of the northern rain shield. A break tonight as a dry slot works its way over the area ahead of the main cold front expected to pass during the day on Saturday. Tonight, widespread IFR will be interrupted by the low-level breakup of stratus and some areas could see consistent oscillation between LIFR and VFR, especially along the coast. Currently expecting patchy fog and some areas of dense fog at our inland terminals before southerly winds develop near daybreak that will scour remaining low-level fog and stratus after 12Z. Areas along the coast will see much more variable conditions with stratus likely to be the dominant reason for sub-VFR conditions.
Extended Outlook . IFR likely through Saturday evening as an area of low pressure moves by the coastal Carolinas. VFR expected Sunday and Monday. Sub-VFR conditions could return Tuesday with a cold front passage with VFR Wednesday.
MARINE. Tonight through Saturday Night:
A wave of low pressure is moving north along a coastal front about 30-50 miles off the Carolina coast. This has led to north and northeast winds and heavy rain across the coastal waters this afternoon. As this wave of low pressure moves away from the area later this evening look for winds and rain to diminish. A second wave of low pressure currently coming our way from the Florida Panhandle should take a more inland track, dragging the front inland across the beaches and veering our wind directions southwesterly. Wind speeds should again increase as this wave passes the area early Saturday morning, reaching at least 20 kt. Rain continues into Saturday afternoon with decreasing thunderstorm threat as front pushes instability further offshore heading into Saturday night. Sea fog with patchy reduced visibility offshore is also a possibility for the next 24 hours. Small craft advisory remains in effect until Saturday night.
Sunday through Wednesday:
High pressure will briefly be over the waters on Sunday into Monday but a cold front from the west will quickly cross the waters late Tuesday night. Winds will approach 25 knots but confidence is low as GEFS is below 50% for winds reaching Small Craft, and the ECMWF ensemble mean is slightly higher. As the front passes east of the coastal waters, winds will slowly diminish by Wednesday. Sea height on Tuesday will increase to 3 to 5 feet but will fall to 2 to 4 feet by Wednesday.
ILM WATCHES/WARNINGS/ADVISORIES. SC . None. NC . None. MARINE . Small Craft Advisory until 1 AM EST Sunday for AMZ254-256. Small Craft Advisory until 5 AM EST Sunday for AMZ250-252.
SYNOPSIS . RH/TRA UPDATE . TRA NEAR TERM . TRA/MCK SHORT TERM . RH LONG TERM . RH AVIATION . 21
Weather Reporting Stations
EDIT (on/off)  Help NOTE: Click on distance to see the station location on a mapStations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
MROS1 - 8661070 - Springmaid Pier, SC | 10 mi | 62 min | 55°F | |||||
NIWS1 - North Inlet-Winyah Bay Reserve, SC | 28 mi | 71 min | NNE 1.9 | 55°F | 1007 hPa | 55°F | ||
41024 - Sunset Nearshore (SUN 2) | 32 mi | 48 min | E 9.7 G 12 | 55°F | 55°F | 1008.6 hPa | ||
41119 | 32 mi | 186 min | 55°F | 3 ft |
Wind History for Springmaid Pier, SC
(wind in knots) EDIT (on/off)  HelpLast 24hr | ||||||||||||||||||||||||
1 day ago | ||||||||||||||||||||||||
2 days ago |
Airport Reports
EDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
Conway Horry County Airport, SC | 6 mi | 61 min | N 0 | 2.00 mi | Fog/Mist | 50°F | 50°F | 100% | 1008.1 hPa |
Myrtle Beach International Airport, SC | 8 mi | 60 min | NNW 4 | 1.00 mi | Fog/Mist | 55°F | 55°F | 100% | 1008.1 hPa |
North Myrtle Beach Grand Strand Airport, SC | 19 mi | 63 min | N 5 | 5.00 mi | Fog/Mist | 54°F | 54°F | 100% | 1007.8 hPa |
Link to 5 minute data for KHYW
Wind History from HYW (wind in knots)
11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 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 | |
Last 24hr | NE G14 | NE | N | N | NE | N | N | NE | N | N | N | N | NE | Calm | NE | NE | Calm | Calm | N | NE | NE | NE | Calm | Calm |
1 day ago | N | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | N | NE | NE G14 | E G15 | NE | N | NE G16 | NE | N G15 | N | N | NE | NE | NE G15 | NE |
2 days ago | S | SW | N | N | NW | NW | N | N | N | N | N G17 | N | N | N | N G17 | N | N G16 | N | N | N | Calm | N | Calm | Calm |
Tide / Current Tables for Keysfield, Waccamaw River, South Carolina
EDIT Weekend mode (on/off) (on/off)  Help One Week of DataKeysfield
Click for Map
Fri -- 02:12 AM EST 1.38 feet High Tide
Fri -- 07:12 AM EST Sunrise
Fri -- 08:28 AM EST Moonset
Fri -- 08:32 AM EST -0.21 feet Low Tide
Fri -- 02:37 PM EST 1.75 feet High Tide
Fri -- 05:08 PM EST Sunset
Fri -- 06:40 PM EST Moonrise
Fri -- 09:14 PM EST 0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 02:12 AM EST 1.38 feet High Tide
Fri -- 07:12 AM EST Sunrise
Fri -- 08:28 AM EST Moonset
Fri -- 08:32 AM EST -0.21 feet Low Tide
Fri -- 02:37 PM EST 1.75 feet High Tide
Fri -- 05:08 PM EST Sunset
Fri -- 06:40 PM EST Moonrise
Fri -- 09:14 PM EST 0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 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 |
1.1 | 1.3 | 1.4 | 1.3 | 1.1 | 0.8 | 0.4 | 0 | -0.2 | -0.2 | 0.1 | 0.6 | 1.1 | 1.5 | 1.7 | 1.7 | 1.6 | 1.3 | 0.9 | 0.6 | 0.3 | 0.1 | 0.2 | 0.5 |
Tide / Current Tables for Conway, RR. bridge, Waccamaw River, South Carolina
EDIT (on/off)  Help One Week of DataConway
Click for Map
Fri -- 03:22 AM EST 1.24 feet High Tide
Fri -- 07:12 AM EST Sunrise
Fri -- 08:28 AM EST Moonset
Fri -- 09:40 AM EST -0.17 feet Low Tide
Fri -- 03:47 PM EST 1.56 feet High Tide
Fri -- 05:08 PM EST Sunset
Fri -- 06:40 PM EST Moonrise
Fri -- 10:22 PM EST 0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 03:22 AM EST 1.24 feet High Tide
Fri -- 07:12 AM EST Sunrise
Fri -- 08:28 AM EST Moonset
Fri -- 09:40 AM EST -0.17 feet Low Tide
Fri -- 03:47 PM EST 1.56 feet High Tide
Fri -- 05:08 PM EST Sunset
Fri -- 06:40 PM EST Moonrise
Fri -- 10:22 PM EST 0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 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 |
0.6 | 0.9 | 1.1 | 1.2 | 1.2 | 1 | 0.7 | 0.4 | 0.1 | -0.1 | -0.2 | 0.1 | 0.5 | 0.9 | 1.3 | 1.5 | 1.6 | 1.5 | 1.2 | 0.9 | 0.5 | 0.3 | 0.1 | 0.1 |
Weather Map
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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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