Tuesday, December10, 2019
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Marine Weather and Tides
Hanahan, 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 7:10AMSunset 5:15PM Tuesday December 10, 2019 10:28 AM EST (15:28 UTC) Moonrise 4:19PMMoonset 5:27AM Illumination 98% Phase: Waxing Gibbous; 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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AMZ330 Charleston Harbor- 957 Am Est Tue Dec 10 2019
Rest of today..SW winds 10 kt, becoming 10 to 15 kt with gusts to 20 kt this afternoon.
Tonight..SW winds 10 kt, becoming W after midnight. A chance of showers. Areas of fog. Vsby 1 to 3 nm.
Wed..N winds 15 kt with gusts to 20 kt. A chance of showers in the morning.
Wed night..N winds 10 to 15 kt, becoming ne 15 to 20 kt after midnight. Waves 1 to 2 ft.
Thu..NE winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft. A slight chance of showers.
Thu night..NE winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft. A chance of showers.
Fri..E winds 10 to 15 kt. Showers likely.
Fri night..SW winds 5 to 10 kt. Showers likely.
Sat..W winds 10 kt. A chance of showers.
Sat night..W winds 10 to 15 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 57 degrees.
AMZ300 957 Am Est Tue Dec 10 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Unseasonably warm conditions will prevail ahead of a cold front today. The 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 Hanahan, SC
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location: 32.91, -79.94     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 101504 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1004 AM EST Tue Dec 10 2019

SYNOPSIS. Unseasonably warm conditions will prevail ahead of a cold front today. The 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.

NEAR TERM /THROUGH TONIGHT/. Late this morning: Satellite imagery shows some lingering stratus though it is showing signs of quickly mixing out as good insolation takes place. Temperatures are warming nicely with some areas already in the low 70s. Forecast highs remain unchanged with upper 70s to low 80s across the area. We will approach daily and monthly records at KCHS and KSAV (see Climate section). There is good model agreement that we will remain rain free today as the cold front and associated forcing arrives more in the evening and overnight periods. Overall, no significant changes were needed to the forecast for today.

Tonight: The cold front will be rather slow in passing through as it becomes oriented to the southwest flow aloft and continues to be impeded by deep ridging from Bermuda to Cuba. Plus the better dynamics will remain off to the north and northwest and the band of deep moisture that is along and behind the cold front shrinks with time. The front itself reaches near the coast by 04-06Z and then pushes into the ocean thereafter. Since the front is an ana-type cold front, the associated showers will occur mainly behind the front, with 40-50% PoP maintained in the forecast. While surface-based CAPE and instability is over the ocean, there is a little bit of elevated instability. Thus we can't rule out a little thunder and lightning in a few spots.

Sea fog will try to expand onshore prior to midnight, but as winds turn offshore late it would push any fog back offshore.

Warm conditions out ahead of the front will hold temps in the 60s through much of the night, but cold advection strengthens significantly late and continues into Wednesday morning. This results in actual lows that occur during the mid morning hours on Wednesday.

SHORT TERM /WEDNESDAY THROUGH FRIDAY/. Strong high pressure will build in from the west on Wednesday behind a departing cold front. Models have backed off on precipitation coverage with drier air moving in, so besides a few showers in the morning, the remainder of the day should be mostly dry. Temperatures really won't move too much throughout the day with ongoing cold advection and an abundance of cloud cover. It will be several degrees cooler than previous days. Lows Wednesday night will be near normal.

High pressure will become wedged down the east side of the Appalachians on Thursday, as a coastal trough develops offshore. A tight pressure gradient between these two features will result in gusty northeast winds, primarily along the coast where gusts around 30 mph will be common. Otherwise, increasing isentropic ascent could support a couple showers, but a good bit of dry air in the mid and upper levels should keep coverage fairly limited through the daytime hours. Forecast continues to feature 20-30% rain chances in the afternoon. Another cool day in the wedge regime with highs topping out in the mid 50s.

High pressure will weaken Thursday night into Friday as low pressure lifts northeast out of the Gulf of Mexico and passes over or near the area. There are still inconsistencies between models regarding timing and the exact track of the low, but regardless, it appears to be a wet day as precipitable water values surge to near 1.5 inches and coincides with favorable large scale forcing from upper divergence and vort energy. Rain chances have been increased to around 70% and will likely need to be increased again in future forecast packages assuming trends hold. Pockets of moderate to heavy rainfall will be possible. Given uncertainty in track of the low, temperature forecast is a bit tricky. Current forecast shows highs ranging from the mid 50s inland to low 60s at the coast.

LONG TERM /FRIDAY NIGHT THROUGH MONDAY/. Models are in decent agreement through the long term period. Low pressure and associated rainfall is expected to be exiting the area Friday night into Saturday. High pressure will return in its wake, with dry conditions expected for the latter half of the weekend and early next week. Temperatures will generally be above normal.

AVIATION /15Z TUESDAY THROUGH SATURDAY/. VFR will prevail today into the first part of tonight before a cold front moves through and generates scattered -SHRA/SHRA, and MVFR or possible IFR conditions the last several hours of the 12Z TAF cycle. Gusty S-SW winds will peak around 20 kt, maybe even a little higher during the late morning and afternoon, with speeds getting a boost from the sea breeze.

Extended Aviation Outlook: Flight restrictions in ceilings could linger into Wednesday. Flight restrictions are then likely Thursday night through Friday as a low pressure system impacts the area. VFR is expected to return on Saturday.

MARINE. Today: The west-northwest periphery of extensive Atlantic high pressure will continue to hold back the next cold front from getting here . at least for the time being. S and SW winds will average 10 to 15 kt, with some higher gusts, while seas will be as large as 3 to 5 ft.

Tonight: It takes until after midnight before the front starts reaching the local waters, but it is past the entire marine area before daybreak Wednesday. S and SW winds of 10 to 15 kt ahead of the front will clock around to the W and drop several knots for a few hours as the isobar pattern becomes "baggy overnight. Winds then shift to the NW and increase a good 5 to 10 kt begins the front late. Seas will hold in the range of 3 to 5 ft. Showers and maybe even a couple of t-storms will occur in association with the front.

Sea Fog: Given the abnormally warm and humid air mass, conditions would appear favorable for sea fog. However, there is too much wind in the mixed layer today. Winds will drop off enough for several hours prior to the frontal passage between about 11 pm and 3 am. This would be the prime time for any significant sea fog to occur. We have areas of dense fog in the forecast to account for this. As winds shift offshore in direction late the fog potential diminishes quickly before sunrise Wednesday.

Wednesday through Sunday: Marine conditions will deteriorate Wednesday into Thursday as strong high pressure builds into the area. We have issued Small Craft Advisories for all of the coastal waters due to increasing northeast winds and building seas. An Advisory is likely for the Charleston Harbor at some point as well, however it appears winds will not reach criteria until Wednesday night, so have held off on issuing for now. The worst conditions across the waters will occur late Wednesday night through Thursday, when gale-force gusts will be possible. Gale Watches and/or Warnings could be needed for at least portions of the waters. Conditions will improve on Friday, although advisories will persist as seas take a bit longer to subside. Low pressure will pass over or near the waters late week into early weekend, followed by a return to high pressure. No additional concerns are expected at this time.

TIDES/COASTAL FLOODING. Elevated tide cycles are expected late week due to increasing astronomical influences with the full moon on Thursday and strong northeasterly winds. Minor to moderate coastal flooding will be possible with the morning high tides Thursday through Saturday. Coastal Flood Advisories could be required. Also of note, if significant rainfall occurs around the morning high tides Friday and Saturday, the potential for flooding of poor drainage areas could increase along the coast.

CLIMATE. Record Maximum Temps for the month of December . KCHS . 83F set on December 11, 1972. KSAV . 83F, set multiple times, the last on December 24, 2015.

Record Maximum Temps December 10th . KCHS . 82F set in 1972. KCXM . 79F set in 1943. KSAV . 82F set in 1972.

Record High Minimum Temp December 10th . KCXM . 62F last set in 2012.

EQUIPMENT. KCLX will remain down until further notice.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from noon Wednesday to 4 PM EST Friday for AMZ352-354. Small Craft Advisory from noon Wednesday to 4 PM EST Saturday for AMZ374. Small Craft Advisory from 7 AM Wednesday to 4 AM EST Saturday for AMZ350.



NEAR TERM . BSH/33 SHORT TERM . ETM LONG TERM . ETM AVIATION . 33/ETM MARINE . 33/ETM TIDES/COASTAL FLOODING . CLIMATE . EQUIPMENT .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 9 mi59 min SSW 6 G 8 71°F 57°F1019.4 hPa
FBIS1 - Folly Island, SC 16 mi89 min SW 8.9 G 12 63°F 1019.9 hPa (+1.2)62°F
41029 - Capers Nearshore (CAP 2) 18 mi81 min SW 9.7 G 14 60°F 56°F1020.1 hPa
ACXS1 - ACE Basin Reserve, SC 36 mi104 min SSW 1 65°F 1019 hPa63°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 50 mi104 min SW 7 65°F 1018 hPa61°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston, Charleston Air Force Base, SC5 mi93 minWSW 810.00 miMostly Cloudy67°F62°F84%1019 hPa
Mount Pleasant Regional-Faison Field, SC8 mi34 minSW 6 G 1110.00 miFair72°F64°F78%1019.3 hPa
Charleston Executive Airport, SC15 mi34 minSW 79.00 miFair72°F64°F78%1019.6 hPa
Moncks Corner Berkeley County, SC20 mi34 minWSW 77.00 miOvercast66°F64°F94%1019.3 hPa
Summerville Airport, SC21 mi34 minN 010.00 miOvercast68°F64°F88%1019 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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1 day agoN7NE10N8NE10N9NE7N5N5NE4NE5NE6E5N6NE5NE3E4E5E4E4N3E3CalmE4Calm
2 days agoNE9NE7E9E7NE8E8E7E6E7NE5NE4NE7NE8NE9NE8NE9NE8NE9NE7NE7N6NE8NE9NE7

Tide / Current Tables for Clouter Creek, north entrance, Cooper River, South Carolina
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Clouter Creek
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Tue -- 12:37 AM EST     0.12 feet Low Tide
Tue -- 05:26 AM EST     Moonset
Tue -- 07:05 AM EST     6.05 feet High Tide
Tue -- 07:11 AM EST     Sunrise
Tue -- 01:14 PM EST     0.43 feet Low Tide
Tue -- 04:19 PM EST     Moonrise
Tue -- 05:13 PM EST     Sunset
Tue -- 07:24 PM EST     5.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.92.23.64.95.76.15.84.83.62.21.10.50.71.52.73.84.65.154.33.21.9

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Tue -- 12:36 AM EST     0.00 knots Slack
Tue -- 03:06 AM EST     1.77 knots Max Flood
Tue -- 05:26 AM EST     Moonset
Tue -- 06:55 AM EST     -0.00 knots Slack
Tue -- 07:10 AM EST     Sunrise
Tue -- 10:10 AM EST     -2.39 knots Max Ebb
Tue -- 01:18 PM EST     0.00 knots Slack
Tue -- 03:30 PM EST     1.48 knots Max Flood
Tue -- 04:19 PM EST     Moonrise
Tue -- 05:13 PM EST     Sunset
Tue -- 07:01 PM EST     -0.00 knots Slack
Tue -- 10:19 PM EST     -2.24 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.60.41.31.81.61.30.8-0.1-1.1-1.9-2.4-2.1-1.3-0.30.71.41.41.10.70-0.9-1.7-2.2-2.1

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (10,2,3,4)
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Ground Weather Radar Station Charleston, SC
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