Tuesday, December10, 2019
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Marine Weather and Tides
McClellanville, SC

Version 3.4
NOTICE
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 7:09AMSunset 5:14PM Tuesday December 10, 2019 9:23 PM EST (02:23 UTC) Moonrise 4:17PMMoonset 5:25AM Illumination 99% Phase: Full Moon; Moon at 14 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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AMZ350 Waters From South Santee River To Edisto Beach Sc Out 20 Nm- 907 Pm Est Tue Dec 10 2019
.small craft advisory in effect from 7 am est Wednesday through late Friday night...
Tonight..SW winds 10 to 15 kt, becoming nw with gusts to 20 kt late. Seas 4 to 5 ft. A chance of showers. Patchy fog after midnight.
Wed..N winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft, building to 4 to 6 ft in the afternoon. A chance of showers in the morning.
Wed night..NE winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 6 ft, building to 5 to 7 ft after midnight.
Thu..NE winds 25 kt with gusts to 35 kt. Seas 6 to 8 ft. A slight chance of showers in the morning, then a chance of showers in the afternoon.
Thu night..NE winds 20 to 25 kt with gusts to 35 kt. Seas 6 to 8 ft. A chance of showers.
Fri..NE winds 15 to 20 kt, becoming se 10 to 15 kt in the afternoon. Seas 5 to 7 ft, subsiding to 4 to 6 ft in the afternoon. Showers.
Fri night..SW winds 10 to 15 kt. Seas 4 to 6 ft. Showers.
Sat..W winds 10 to 15 kt. Seas 4 to 5 ft. A chance of showers.
Sat night..W winds 15 to 20 kt. Seas 3 to 4 ft.
Sun..W winds 10 to 15 kt. Seas 3 to 4 ft.
Sun night..N winds 5 to 10 kt. Seas 2 ft.
AMZ300 907 Pm Est Tue Dec 10 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will push through the region tonight, with strong high pressure to build over the area Wednesday through Thursday. A low pressure system will impact the area late week, followed by a return to high pressure over the weekend into early next week.


7 Day Forecast for Marine Location Near McClellanville, SC
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location: 33, -79.36     debug


Area Discussion for - Wilmington, NC
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FXUS62 KILM 102323 AFDILM

Area Forecast Discussion National Weather Service Wilmington NC 623 PM EST Tue Dec 10 2019

SYNOPSIS. A cold front tonight will bring areas of rain, followed by cooler air through mid week. Brief clearing and drying Thursday will be followed by a wet Gulf system Friday into Saturday. Dry high pressure will build in Saturday night through Monday.

UPDATE. Front is making rapid progress eastward and latest obs show its position is closest to the faster 18z NAM and 12z NMM and ARW WRF models. Once cold advection develops behind the front overnight, cold advection should mix down 15-25 mph northerly winds. Minor tweaks have been made to forecast low temps and precip timing/location based mainly on latest HRRR/National Model Blend 1-hr QPF maps.

NEAR TERM /THROUGH WEDNESDAY NIGHT/. Rain showers associated with a cold front will meet the I-95 corridor between 7 and 8 pm, with measurable rain reaching the coast at or a little after midnight. A few offshore showers may briefly clip Bald Head Island at 6 pm. System totals not to go down as a memorable rain event, between 0.08-0.23" most locals, locally less, or more, is isolated locations, because of the convective nature of the pcpn. Light showers to clear the coast by 9 am Saturday. FROPA late evening well inland, with wind shifts to the W-WNW at KILM and KMYR 5z.

Cold air advection prior to sunrise will bring in cool air, but opted for upper end of guidance, based on frontal timing, clouds, wind, and a period of downslope component, min-T 50 well inland, 59-64 along the coast from Surf City to Tom Yawkee Wildlife Center.

Morning clouds likely until the front deepens late morning or early afternoon, after which unrelenting drying and mixing scours clouds in the afternoon, with bite of a north wind. Max-T Wednesday will struggle to crack 55 degrees for most areas. 15-25 kt N wind in the boundary layer Wednesday night will prevent ideal cooling, but expect a cold one, widespread 30s early Thursday.

SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/. High pressure wedge very typical of winter will bring a chilly day Thursday with highs struggling to the 50 degree mark. Thursday night will be more seasonably cool however. Not because of the warm advection however since it will not mix down to the surface, but rather as a result of increasing cloud cover.

LONG TERM /FRIDAY THROUGH TUESDAY/. Initially weak coastal trough and front later has a weakly closed low move NE. Moderate rain will overspread the area Friday that should last into Saturday morning. Cool advection behind the Saturday front will be tempered by the low amplitude flow. In fact a broad baroclinic zone spanning the Carolinas and Gulf States will serve as moisture-increasing isentropic lift surface late in the period with rain likely returning towards its end.

AVIATION /00Z WEDNESDAY THROUGH SUNDAY/. High confidence of MVFR CIGs during the overnight as a cold front moves through the area. Showers are expected with the frontal passage followed by the potential for some -RA/-DZ in the wake of the boundary overnight. CIGs improve to VFR all terminals Wednesday morning as drying occurs through the column. Otherwise, gusty winds expected after frontal passage into Wednesday morning before decreasing later in the day as the pressure gradient weakens significantly.

Extended Outlook . VFR Wednesday night through Thursday. Another round of MVFR is possible Friday into Saturday as an area of low pressure moves by the coastal Carolinas. VFR expected Sunday.

MARINE. Dangerous marine conditions to unfold in wake of a cold front, gusts 25 kt or more at or just after daybreak Wednesday. A cold front will reach the coast midnight-1am, bringing windshifts to the waters thereafter, with rain showers lingering into Wednesday morning. Marine visibility could be reduced to 2 nm or less in rain late tonight and Wednesday morning. Hazardous wind-seas, large and steep to overwhelm the waters Wednesday, dominant periods 5-7 seconds. Latest numerical wave guidance shows seas peaking 8-9 feet outer waters midday Wednesday, unfortunately remaining above 6 feet through at least Friday the 13th over the offshore waters.

The longer term of the marine forecast will be a period where conditions struggle to get below advisory thresholds. Initially this will be because of a pinched gradient on the east side of an overland wedge of high pressure Thursday. This gradient initially eases early Friday as a trough develops, the decreased wind speed offset by a more onshore flow when it comes to wave heights. Low pressure then runs up the coast Friday night into Saturday morning once again bringing stiffer winds, albeit winds that turn back offshore. It is finally on Sunday that high pressure builds in to significantly decrease wind and seas that advisories may finally drop.

ILM WATCHES/WARNINGS/ADVISORIES. SC . None. NC . None. MARINE . Small Craft Advisory from 6 AM Wednesday to 6 PM EST Friday for AMZ250-252-254-256.



SYNOPSIS . ILM UPDATE . TRA NEAR TERM . 08 SHORT TERM . mbB LONG TERM . mbB AVIATION . SRP


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41029 - Capers Nearshore (CAP 2) 20 mi76 min W 3.9 G 7.8 62°F 57°F1019.1 hPa
NIWS1 - North Inlet-Winyah Bay Reserve, SC 26 mi99 min SW 8 66°F 1017 hPa65°F
CHTS1 34 mi54 min SSW 6 G 8 68°F 58°F1018 hPa
FBIS1 - Folly Island, SC 35 mi84 min SW 7 G 8 62°F 1018.4 hPa (+0.9)62°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 37 mi34 min 14 G 16 73°F6 ft1018.2 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Georgetown County Airport , SC22 mi29 minSW 510.00 miFair66°F62°F88%1018.3 hPa
Mount Pleasant Regional-Faison Field, SC24 mi29 minSSW 97.00 miA Few Clouds68°F68°F100%1017.9 hPa

Link to 5 minute data for KGGE

Wind History from GGE (wind in knots)
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1 day agoN4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS4S5S3S4SW4S8S6
2 days agoNE6NE6NE7NE6NE6NE6NE7NE4N5N4N6NE5NE6N4N7N6N7N6N6N4N5N4N3Calm

Tide / Current Tables for Cape Romain, South Carolina
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Cape Romain
Click for Map
Tue -- 05:24 AM EST     Moonset
Tue -- 05:57 AM EST     5.18 feet High Tide
Tue -- 07:09 AM EST     Sunrise
Tue -- 12:24 PM EST     0.37 feet Low Tide
Tue -- 04:16 PM EST     Moonrise
Tue -- 05:10 PM EST     Sunset
Tue -- 06:16 PM EST     4.39 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.71.83.14.24.95.24.94.13.1210.40.51.22.33.344.44.33.72.71.70.7

Tide / Current Tables for Five Fathom Creek entrance, South Carolina
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Five Fathom Creek entrance
Click for Map
Tue -- 05:25 AM EST     Moonset
Tue -- 06:13 AM EST     5.41 feet High Tide
Tue -- 07:09 AM EST     Sunrise
Tue -- 12:34 PM EST     0.39 feet Low Tide
Tue -- 04:17 PM EST     Moonrise
Tue -- 05:11 PM EST     Sunset
Tue -- 06:32 PM EST     4.59 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.51.634.255.45.24.53.52.31.20.50.51.12.23.244.54.543.120.9

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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