Friday, December13, 2019
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Marine Weather and Tides
Summerville, 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 7:13AMSunset 5:16PM Friday December 13, 2019 3:02 AM EST (08:02 UTC) Moonrise 6:48PMMoonset 8:31AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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- 1255 Am Est Fri Dec 13 2019
Rest of tonight..NE winds 15 to 20 kt, diminishing to 10 to 15 kt. Waves 1 to 2 ft. A chance of rain.
Fri..NE winds 10 kt, becoming e, then variable 5 to 10 kt late. Rain.
Fri night..S winds 10 kt, becoming sw. A slight chance of tstms. Showers.
Sat..W winds 10 to 15 kt. A chance of showers in the morning.
Sat night..W winds 10 to 15 kt.
Sun..W winds 5 to 10 kt.
Sun night..S winds 5 kt.
Mon..SE winds 5 kt.
Mon night..S winds 10 kt. A slight chance of showers.
Tue..SW winds 10 to 15 kt. Showers likely.
Tue night..NW winds 10 to 15 kt. A chance of showers. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 57 degrees.
AMZ300 1255 Am Est Fri Dec 13 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Strong high pressure north of the area will shift off the coast tonight, as low pressure emerges from the gulf of mexico. The low will track north across our area Friday and will produce widespread rain especially later tonight into Friday night. High pressure will then build over the region and will provide dry and warmer conditions Saturday afternoon through early next week. A cold front will cross the area Tuesday, followed by much cooler high pressure into late next week.


7 Day Forecast for Marine Location Near Summerville, SC
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location: 32.96, -80.2     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 130607 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 107 AM EST Fri Dec 13 2019

SYNOPSIS. Strong high pressure north of the area will shift off the coast tonight, as low pressure emerges from the Gulf of Mexico. The low will track north across our area Friday and will produce widespread rain especially later tonight into Friday night. High pressure will then build over the region and will provide dry and warmer conditions Saturday afternoon through early next week. A cold front will cross the area Tuesday, followed by much cooler high pressure into late next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/. Shower coverage has been sparse prior to 06Z, we have made some initialization adjustments trending down on POPs until later tonight when coverage expands. Widespread lower clouds should continue to build down. Since winds remain elevated along coastal zones, the risk for stratus build down to increase fog potential looks low at this time. Temperatures will not change much overnight with lows mainly ranging from the lower-mid 40s well inland to lower-mid 50s near the coast.

SHORT TERM /6 AM THIS MORNING THROUGH SUNDAY/. Significant rainfall Friday and Friday night will highlight this period.

Friday: Ahead of low pressure emerging from the Gulf of Mexico, deep- layered moisture transport will overrun the wedge of surface high pressure in place over the region. As a result, rain will be overspreading the region and should advance to the Santee River as the morning progresses. As the low pressure tracks north/northeast and an associated coastal front intensifies, rain could become heavy at times. Later in the day into Friday evening, as the low pressure passes over or close to our coast, the coastal front could push onshore as a warm front. Thus, for a few hours this scenario could support a couple of stronger thunderstorms with potential for rotation, especially along the coast. However, best low-level instability could remain in the warm sector just offshore, so the probability for severe weather should remain low.

Friday night: The surface low and associated prime overrunning regime/pool of deepest moisture will lift north of the region. However, even as steady rain exits the region, additional scattered/numerous showers should persist through the night as the parent upper trough approaches from the west.

Saturday: As the upper trough advances toward the east coast, Isolated/scattered showers could persist to start the day. Then, most guidance depicts significant drying especially during the afternoon, with elevated west winds pushing high temperatures into the 60s. Of note, the 12Z NAM12 depicts a significant shield of precipitation accompanying the upper trough into our area Saturday later morning into mid-afternoon. However, this solution is not supported by other guidance and has been discounted for the latest forecast.

Saturday night and Sunday: High pressure will provide dry and slightly-above normal temperatures.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. High pressure will shift into the Atlantic Sunday night into Monday, with the area becoming positioned in the warm sector ahead of low pressure tracking into the Ohio River Valley. Meanwhile, heights will build aloft. Large scale subsidence should preclude any rainfall through Monday. The low and associated cold front will approach on Monday night, then pass through the area Tuesday, bringing the next chance of rain with it. Dry high pressure will build in on Wednesday. Temperatures will be well above normal through Tuesday, then fall below normal on Wednesday after frontal passage.

AVIATION /06Z FRIDAY THROUGH TUESDAY/. Overnight: Stratocu should build down to stratus across the coastal corridor, resulting in widespread IFR cigs. Chances for showers will increase at KSAV initially late, then spread and develop northward.

The rain is still on the way and we have prevailing rains and IFR cigs today along with IFR vsbys likely at times in heavier showers. As a warm front develops later today, there is a chance that LIFR conditions develop develop late day or early this evening in the wake of the surface low that skirts up the SC coast. We will continue to monitor surface/model trends for build down low clouds during this time period.

Extended Aviation Outlook: IFR or lower flight categories will prevail much of the time into Saturday morning as low pressure produces rain across the region. VFR will return thereafter and prevail until a cold front arrives with showers Tuesday.

MARINE. Overnight: Persistent, elevated northeast winds will prevail given the tight pressure gradient between inland high pressure and offshore low pressure, although speeds will be slowly lowering with time. Small Craft Advisory conditions are expected for all waters overnight. It remains quite gusty near the CHS Harbor Entrance, however winds were below SCA criteria in the harbor per latest observations.

Friday through Tuesday: Small Craft Advisories mainly due to elevated seas will be ongoing at the start of this period for all coastal waters. Seas are expected to subside and advisories expire from south to north through the day. The exception would be in the outer Georgia waters where at least 6 ft seas will persist into Saturday. As low pressure tracks over or close to the waters later Friday and Friday evening, a few stronger thunderstorms could prompt Special Marine Warnings. Also of note, dewpoints around 60 degrees, water temperatures in the 50s and a period of light winds could translate to pockets of fog over nearshore marine waters Friday night. Low pressure will advance north of the waters and will pull an associated cold front through the waters by Saturday morning. Thus, a brief surge of offshore winds is expected Saturday afternoon into Saturday night, and additional Small Craft Advisories could be needed for portions of the waters. Then, high pressure will provide tranquil marine conditions Sunday into Monday. Another cold front is expected to cross Tuesday, with S/SW winds increasing ahead of the front and elevated winds shifting to the NW then N after cold fropa Tuesday night. Small Craft Advisories could again be required Tuesday/Tuesday night, especially across AMZ350 and AMZ374.

TIDES/COASTAL FLOODING. Latest tide forecast indicates minor coastal flooding along the SC coast Friday morning while tides along the northern GA coast should remain just low enough to keep the risk of flooding pretty low. However, heavy rainfall could be occurring along the GA coast around the time of this high tide, so this may end up causing some minor flooding anyway. The heavier rain should remain away from the SC coast during the morning high tide. Even after the elevated Friday morning high tide, locally heavy rainfall could produce minor flooding of poor drainage areas in coastal communities into Friday evening.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 1 PM EST this afternoon for AMZ352- 354. Small Craft Advisory until 5 AM EST Sunday for AMZ374. Small Craft Advisory until 4 PM EST this afternoon for AMZ350.

NEAR TERM . SHORT TERM . LONG TERM . AVIATION . MARINE . TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 19 mi51 min N 12 G 15 50°F 57°F1024.1 hPa
FBIS1 - Folly Island, SC 25 mi63 min NNE 19 G 21 50°F 1024.3 hPa (-3.2)49°F
ACXS1 - ACE Basin Reserve, SC 31 mi78 min NNE 5.1 49°F 1024 hPa45°F
41029 - Capers Nearshore (CAP 2) 32 mi55 min ENE 21 G 27 50°F 56°F1024.8 hPa
41033 48 mi55 min ENE 21 G 29 53°F 56°F1024.8 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Summerville Airport, SC8 mi68 minNE 510.00 miOvercast46°F39°F76%1024.7 hPa
Charleston, Charleston Air Force Base, SC10 mi67 minNNE 910.00 miOvercast47°F39°F74%1024.5 hPa
Moncks Corner Berkeley County, SC18 mi68 minNE 67.00 miOvercast45°F35°F71%1025.4 hPa
Charleston Executive Airport, SC21 mi68 minN 07.00 miOvercast50°F44°F82%1024 hPa
Mount Pleasant Regional-Faison Field, SC23 mi68 minN 510.00 miOvercast48°F42°F82%1024.7 hPa
Walterboro Lowcountry Regional Airport, SC24 mi68 minNE 10 G 1410.00 miOvercast45°F39°F81%1024.7 hPa

Link to 5 minute data for KDYB

Wind History from DYB (wind in knots)
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Last 24hrCalmCalmCalmNE84
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53Calm6Calm5W5CalmN7N85

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
Click for Map
Fri -- 05:50 AM EST     -0.09 feet Low Tide
Fri -- 07:14 AM EST     Sunrise
Fri -- 08:31 AM EST     Moonset
Fri -- 11:04 AM EST     2.31 feet High Tide
Fri -- 05:15 PM EST     Sunset
Fri -- 06:32 PM EST     0.05 feet Low Tide
Fri -- 06:47 PM EST     Moonrise
Fri -- 11:23 PM EST     1.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.410.60.2-0-0.10.20.91.62.12.32.221.61.10.70.30.10.10.51.11.61.8

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Fri -- 02:35 AM EST     0.00 knots Slack
Fri -- 05:20 AM EST     2.07 knots Max Flood
Fri -- 07:12 AM EST     Sunrise
Fri -- 08:29 AM EST     Moonset
Fri -- 09:08 AM EST     -0.00 knots Slack
Fri -- 12:20 PM EST     -2.75 knots Max Ebb
Fri -- 03:28 PM EST     0.00 knots Slack
Fri -- 05:14 PM EST     Sunset
Fri -- 05:46 PM EST     1.62 knots Max Flood
Fri -- 06:46 PM EST     Moonrise
Fri -- 09:14 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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-2.4-1.8-0.70.51.421.91.510.2-1-2.1-2.7-2.6-1.7-0.50.61.41.61.20.80.2-0.8-1.8

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 (3,6,7,8)
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Ground Weather Radar Station Charleston, SC
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