Saturday, December14, 2019
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Marine Weather and Tides
Mount Pleasant, 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 7:12AMSunset 5:15PM Saturday December 14, 2019 9:41 PM EST (02:41 UTC) Moonrise 7:48PMMoonset 9:27AM Illumination 88% Phase: Waning Gibbous; Moon at 18 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- 914 Pm Est Sat Dec 14 2019
Tonight..W winds 15 kt early, diminishing to 10 to 15 kt, then 5 to 10 kt late.
Sun..W winds 5 to 10 kt.
Sun night..S winds 5 kt.
Mon..S winds 5 kt, increasing to 10 kt in the afternoon.
Mon night..S winds 10 kt. A slight chance of showers after midnight.
Tue..SW winds 10 to 15 kt with gusts to 20 kt. A chance of showers in the morning, then showers likely with a slight chance of tstms in the afternoon.
Tue night..NW winds 10 kt, becoming N with gusts to 20 kt after midnight. A chance of showers.
Wed..N winds 10 to 15 kt.
Wed night..N winds 10 kt.
Thu..NE winds 5 to 10 kt.
Thu night..NE winds 5 kt. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 56 degrees.
AMZ300 914 Pm Est Sat Dec 14 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build from the west through the weekend and then slide offshore on Monday. A cold front will then cross the area late Tuesday, followed by high pressure into late next week. Low pressure should then develop along the coast next weekend.


7 Day Forecast for Marine Location Near Mount Pleasant, SC
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location: 32.93, -79.83     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 142347 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 647 PM EST Sat Dec 14 2019

SYNOPSIS. High pressure will build from the west through the weekend and then slide offshore on Monday. A cold front will then cross the area late Tuesday, followed by high pressure into late next week. Low pressure should then develop along the coast next weekend.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. Other than to tweak hourly temps down a little this evening based on recent trends and decoupling to occur, plus to make it about 1-2F colder far inland for min temps, the ongoing forecast looks to be in excellent shape.

Previous discussion . Dry high pressure will settle over the area tonight with weakening winds this evening. Fairly good radiational cooling will produce a cool night with lows in the upper 30s to lower 40s. Some fog could move into our far southern GA zones late tonight after developing over central GA.

SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/. Sunday: Sfc high pressure will begin the day on Sunday centered over the FL/GA line. The high center is expected to drift east during the day, positioned off Southeast U.S. coast by Sunday afternoon. As a result, weak return flow will develop across the forecast area by Sunday afternoon. The combination of warming thicknesses and mostly sunny conditions should result in steady heating through the day. High temperatures are forecast to range from the upper 60s across SE GA to the mid 60s across the I-26 corridor.

Sunday night through Monday night: The forecast area will remain between high pressure over the Atlantic and developing low pressure over the ArkLaTex. Strengthening return flow, especially on Monday, is forecast to result in steadily warming thicknesses Sunday night through Monday. Mostly clear conditions and light to calm winds should support radiational cooling Sunday night, lows forecast to range in the 40s. Mild thicknesses and llvl temperatures should result in around 25 degrees of warming during the daylight hours on Monday. High temperatures are forecast to range from the low 70s across Berkeley County to the upper 70s across SE GA. Monday night, winds should remain steady from southwest, maintaining mixing. Short term guidance times the arrival of weak showers during the late night hours Monday night. Using a blend of MOS, low temperatures are forecast to range in the upper 50s to around 60.

Tuesday: A cold front will approach the forecast area from the west, remaining west during the morning hours. The cold front is expected to reach SE GA and SC by the afternoon, pushing offshore during the evening hours. The GFS indicates that between 500-1000 J/kg of CAPE will develop along and ahead of the cold front. I will indicate a band of showers with embedded thunderstorms crossing the forecast area Tuesday afternoon into the early evening. High temperatures are expected to range slightly cooler than Monday.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/. Dry and cooler high pressure will spread across the region Tuesday night through Thursday with high/low temps some 15-20 degrees cooler than earlier in the week. In general, high temps will peak in the mid 50s Wednesday and Thursday while overnight lows dip into the low/mid 30s away from the coast Wednesday night and Thursday night. Guidance then suggests the potential for precip to return across the area next weekend, mainly due to a coastal trough/low developing just off the Southeast Coast. Precip chances should be highest near the land/sea interface Saturday. Temps will be slightly more mild during the weekend as well, peaking in the upper 50s/lower 60s each day. Overnight lows should range in the upper 30s/lower 40s away from the coast.

AVIATION /00Z SUNDAY THROUGH THURSDAY/. VFR at KCHS and KSAV through 00Z Monday. Low end chance of some ground fog at KSAV around daybreak Sunday.

Extended Aviation Outlook: Brief patchy fog is possible around dawn Monday morning at both CHS and SAV terminals. Otherwise, conditions will remain VFR. Flight restrictions are possible at both terminals Tuesday due to showers/thunderstorms along a passing cold front. VFR conditions are forecast at both terminals Wednesday.

MARINE. The gradient will gradually relax this evening and overnight. Small Craft Advisories drop off sequentially through the evening and overnight.

Sunday through Thursday: Sfc high pressure will begin the day on Sunday centered over the FL/GA line. The high center is expected to drift east during the day, positioned off Southeast U.S. coast by Sunday afternoon and will linger through Monday night. Light south winds are forecast Sunday through Monday, with winds increasing from the southwest Monday night. Seas will range from 1-3 ft on Sunday, building to 3-5 ft by Monday night. A cold front will approach the forecast area from the west, remaining west during the morning hours. The cold front is expected to reach SE GA and SC by the afternoon, pushing offshore during the evening hours. Small Craft Advisory seas and wind gusts could develop during the day across AMZ350 and 374. Small Craft conditions may spread into the other near shore waters Tuesday night into Wednesday morning. Building high pressure will continue in the wake of the cold front, maintain steady to gusty NW winds Wednesday, turning from the NE on Thursday. Seas around 6 ft may continue across the outer GA waters from Tuesday through Thursday.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 9 PM EST this evening for AMZ352. Small Craft Advisory until 5 AM EST Sunday for AMZ374. Small Craft Advisory until midnight EST tonight for AMZ350.

NEAR TERM . SHORT TERM . LONG TERM . DPB AVIATION . MARINE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 11 mi59 min WSW 7 G 9.9 53°F 56°F1011.9 hPa
41029 - Capers Nearshore (CAP 2) 14 mi33 min W 18 G 21 55°F 56°F1012.7 hPa
FBIS1 - Folly Island, SC 17 mi41 min W 9.9 G 14 52°F 1012.7 hPa (+3.1)47°F
ACXS1 - ACE Basin Reserve, SC 42 mi116 min Calm 49°F 1012 hPa46°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 45 mi116 min WSW 7 51°F 1009 hPa45°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 49 mi41 min 23 G 31 72°F1011.2 hPa (+3.2)

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC3 mi46 minW 7 G 1410.00 miFair52°F46°F82%1011.8 hPa
Charleston, Charleston Air Force Base, SC11 mi1.8 hrsW 910.00 miFair49°F44°F83%1011.1 hPa
Charleston Executive Airport, SC18 mi46 minN 010.00 miFair50°F46°F88%1012.5 hPa
Moncks Corner Berkeley County, SC21 mi46 minWSW 310.00 miFair46°F42°F87%1011.8 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrNW3NW3CalmSW4CalmW5CalmCalmNW7S4W8W5W10W10W12
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1 day agoNE12NE9NE10NE7NE9NE8NE9NE7NE9NE8NE9N10N10N6NW8NW7N9NE7NE4N5N4CalmNW6NW6
2 days agoN12NE10NE9NE10NE10NE8NE6NE9NE8NE9NE11NE12NE9NE8NE8NE11NE11NE9NE8NE10NE10NE10NE8NE6

Tide / Current Tables for Cainhoy, Wando River, South Carolina
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Cainhoy
Click for Map
Sat -- 03:26 AM EST     -0.25 feet Low Tide
Sat -- 07:13 AM EST     Sunrise
Sat -- 09:26 AM EST     Moonset
Sat -- 10:00 AM EST     7.25 feet High Tide
Sat -- 04:09 PM EST     0.14 feet Low Tide
Sat -- 05:13 PM EST     Sunset
Sat -- 07:47 PM EST     Moonrise
Sat -- 10:21 PM EST     5.71 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.72.10.7-0.2-0.10.92.64.45.96.97.36.85.63.92.20.80.20.51.534.35.25.75.6

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sat -- 12:28 AM EST     -2.42 knots Max Ebb
Sat -- 03:18 AM EST     0.00 knots Slack
Sat -- 06:06 AM EST     2.10 knots Max Flood
Sat -- 07:13 AM EST     Sunrise
Sat -- 09:26 AM EST     Moonset
Sat -- 09:53 AM EST     -0.00 knots Slack
Sat -- 01:05 PM EST     -2.75 knots Max Ebb
Sat -- 04:13 PM EST     0.00 knots Slack
Sat -- 05:14 PM EST     Sunset
Sat -- 06:34 PM EST     1.60 knots Max Flood
Sat -- 07:48 PM EST     Moonrise
Sat -- 10:01 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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-2.3-2.3-1.5-0.40.81.72.11.91.40.8-0.1-1.3-2.3-2.7-2.4-1.4-0.20.81.51.51.10.70-1

Weather Map
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wmap_A
GEOS Local Image of Southeast    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 (21,6,7,8)
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Ground Weather Radar Station Charleston, SC
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