Friday, December6, 2019
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Marine Weather and Tides
Awendaw, 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 7:06AMSunset 5:14PM Friday December 6, 2019 12:45 AM EST (05:45 UTC) Moonrise 2:10PMMoonset 1:40AM Illumination 68% Phase: Waxing Gibbous; Moon at 9 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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AMZ330 Charleston Harbor- 903 Pm Est Thu Dec 5 2019
Tonight..Variable winds less than 5 kt, becoming e.
Fri..E winds 5 kt. A chance of showers in the afternoon.
Fri night..N winds 5 to 10 kt. A chance of showers, mainly in the evening.
Sat..NE winds 10 kt.
Sat night..NE winds 10 kt.
Sun..NE winds 10 kt. A slight chance of showers.
Sun night..E winds 5 to 10 kt, becoming se after midnight. A slight chance of showers.
Mon..S winds 10 to 15 kt. A slight chance of showers.
Mon night..SW winds 10 to 15 kt.
Tue..SW winds 10 to 15 kt. A slight chance of showers.
Tue night..W winds 10 to 15 kt. A chance of showers. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 57 degrees.
AMZ300 903 Pm Est Thu Dec 5 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through tonight, before a coastal trough develops nearby Friday. A cold front will pass through the area Friday night, followed by strong high pressure building inland over the weekend. A warm front will lift north of the region Monday, before a cold front sweeps through the area late Tuesday. Stronger high pressure will then return next Wednesday.


7 Day Forecast for Marine Location Near Awendaw, SC
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location: 32.94, -79.68     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 060213 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 913 PM EST Thu Dec 5 2019

SYNOPSIS. High pressure will prevail through tonight, before a coastal trough develops nearby Friday. A cold front will pass through the area Friday night, followed by strong high pressure building inland over the weekend. A warm front will lift north of the region Monday, before a cold front sweeps through the area late Tuesday. Stronger high pressure will then return next Wednesday.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. High pressure will hold through the night with calm winds. Cirrus will likely disrupt the radiative process somewhat. Adjusted hourly temperatures slightly based on 05/02z observation and lowered overnight lows by a few degrees for many places.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/. Friday: Aloft, a h5 short-wave embedded in mainly a zonal flow will traverse the Southeast United States late in the day. At the sfc, high pressure will steadily decrease across the area as a coastal trough initially develops along the Southeast South Carolina and Southeast Georgia coast during the day, then shifts further offshore as a weak cold front arrives overnight. Moisture advection and isentropic lift associated with the coastal trough should spawn a few showers that gradually drift onshore and increase in coverage during afternoon hours, but the bulk of precip activity should occur in evening and early overnight hours when forcing associated with the h5 shortwave and left front quad of an upper lvl jet are maximized across the area. Given the speed of forcing features, rainfall accumulations will remain low and all showers should be offshore shortly after midnight. Highs should generally range in the mid/upper 60s under increasing cloud cover during the day. Some locations could peak around 70 degrees along the I-95 corridor. Overnight lows should range in the mid/upper 40s.

Saturday and Sunday: High pressure will wedge into the region from the north, remaining the primary weather feature across the area late weekend into early next week. The pattern will likely lead to dry conditions on Saturday, but increasing moisture and isentropic lift could easily support showers developing over coastal waters that eventually spread onshore Sunday. At the very least, cloud cover is anticipated to expand across the region by early next week and could limit overall high temps. Gusty north-northeast winds around 20-25 mph are also possible at times late Saturday into Sunday due to a packed pressure gradient between the inland wedge and a front offshore. In general, highs should range the low/mid 60s both days with potentially cooler temps well inland. Overnight lows should range in the upper 30s/lower 40s across inland areas to upper 40s/lower 50s near the coast.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. The warm front will have lifted to the north of the area Monday, as a deep and moist south-southwest flow develops on the back side of strong Atlantic high pressure. A broad and deep long wave trough will form over the central states and Rockies at the start of the period as phasing of the northern and southern jet streams occur. This causes a cold front to approach early in the week, likely passing through late Tuesday or Tuesday night. This is followed by robust high pressure in its wake. Since there are timing differences regarding the impacts of the cold front, we expect changes to our rain forecast to occur in future forecasts for the first half of the week. Any potential for thunder is too low to include at this time, but there is some instability along with strong shear and impressive dynamics, so t-storms could be added at a later time.

Abnormally warm H85 temps will equate to temps far above climo in advance of the front, with even some indications of 80F in spots. Not quite to record levels, but at least 10-15F above normal. Much cooler air will invade the area behind the front during mid week, with an abrupt change in air mass from tuesday to Wednesday to occur.

AVIATION /02Z FRIDAY THROUGH TUESDAY/. VFR. Risk for shower impacts will increase in the afternoon, mainly at KCHS. Will carry VCSH from 21z on to trend. Cigs will also become established, roughly 4-6kft.

Extended Aviation Outlook: The potential exists for flight restrictions Friday night into Saturday morning as a coastal trough develops along the coast and shifts offshore with a weak cold front. Another round of flight restrictions is possible Saturday night into Sunday as a wedge of high pressure exists across the area. Additional sub-VFR weather could occur late Tuesday as SHRA develops in association with a cold front next week.

MARINE. Tonight: Surface high pressure building into the area will bring a minimal pressure gradient, causing winds to be no more than 10 kt. Seas will generally be 1-2 ft.

Friday through Sunday: A coastal trough will develop along the Southeast coast early this weekend with a relatively weak pressure gradient in place. Conditions should then gradually deteriorate Friday night into Saturday as winds become northeast with high pressure building from the north. The pressure gradient should tighten considerably later Saturday into Sunday as a wedge strengthens inland and could result in Small Craft Advisory level conditions across the portion of the waters.

Monday through Tuesday: The warm front will have passed to the north early in the week, as Atlantic high pressure fills in behind it, and it's associated ridge extends across Florida. An upstream cold front will pass through sometime during late Tuesday or Tuesday night. Conditions will be close to the requirement of advisories again late in the forecast period, but before that occurs there could be the concern of sea fog. An abnormally warm and humid air mass atop the relatively cooler shelf waters within a favorable south-southwest flow could promote the development of sea fog, provided wind speeds don't increase too quickly.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41029 - Capers Nearshore (CAP 2) 10 mi37 min NNE 1.9 G 3.9 56°F 58°F1024.4 hPa
CHTS1 17 mi45 min Calm G 1
FBIS1 - Folly Island, SC 21 mi45 min N 1 G 1.9 50°F 1024.2 hPa (+0.9)49°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 38 mi60 min NW 1.9 40°F 1023 hPa40°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 43 mi25 min 9.7 G 14 72°F1023.2 hPa
ACXS1 - ACE Basin Reserve, SC 49 mi60 min Calm 42°F 1024 hPa42°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC6 mi50 minN 010.00 miFair39°F37°F93%1023.7 hPa
Charleston, Charleston Air Force Base, SC19 mi1.8 hrsN 010.00 miFair42°F39°F92%1023.4 hPa
Charleston Executive Airport, SC24 mi50 minN 010.00 miFair39°F39°F100%1024 hPa

Link to 5 minute data for KLRO

Wind History from LRO (wind in knots)
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Last 24hrW6W6W7NW5NW6NW6NW5NW6N10N96
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2 days agoNW6NW6NW6W5W4CalmCalmNW5W3NW5CalmW7W6SW4
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Tide / Current Tables for Moores Landing, ICWW, Sewee Bay, South Carolina
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Moores Landing
Click for Map
Fri -- 01:40 AM EST     Moonset
Fri -- 03:21 AM EST     4.59 feet High Tide
Fri -- 07:07 AM EST     Sunrise
Fri -- 09:29 AM EST     1.16 feet Low Tide
Fri -- 02:09 PM EST     Moonrise
Fri -- 03:44 PM EST     4.66 feet High Tide
Fri -- 05:11 PM EST     Sunset
Fri -- 09:55 PM EST     0.69 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.73.64.24.64.543.22.41.71.21.21.82.63.44.14.54.64.33.52.61.710.71

Tide / Current Tables for Charleston Harbor, off Fort Sumter, South Carolina Current (expired 1996-12-31)
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Charleston Harbor
Click for Map
Fri -- 12:35 AM EST     1.26 knots Max Flood
Fri -- 01:41 AM EST     Moonset
Fri -- 04:10 AM EST     -0.00 knots Slack
Fri -- 07:07 AM EST     Sunrise
Fri -- 07:15 AM EST     -1.65 knots Max Ebb
Fri -- 10:31 AM EST     0.00 knots Slack
Fri -- 12:56 PM EST     1.28 knots Max Flood
Fri -- 02:10 PM EST     Moonrise
Fri -- 04:27 PM EST     -0.00 knots Slack
Fri -- 05:13 PM EST     Sunset
Fri -- 07:37 PM EST     -1.82 knots Max Ebb
Fri -- 10:57 PM EST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.21.10.80.1-0.7-1.4-1.6-1.6-1.2-0.50.41.11.31.20.90.4-0.5-1.3-1.8-1.8-1.5-0.90

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 Charleston, SC (0,6,7,8)
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Ground Weather Radar Station Charleston, SC
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