Thursday, February20, 2020
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Marine Weather and Tides
Mount Pleasant, SC

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 6:56AMSunset 6:09PM Thursday February 20, 2020 9:46 PM EST (02:46 UTC) Moonrise 5:13AMMoonset 3:29PM Illumination 7% Phase: Waning Crescent; Moon at 27 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- 859 Pm Est Thu Feb 20 2020
.small craft advisory in effect through Friday evening...
Tonight..N winds 20 kt with gusts to 30 kt. Waves 2 ft. Rain.
Fri..N winds 15 to 20 kt with gusts to 30 kt. Waves 1 to 2 ft. A slight chance of rain with patchy drizzle in the morning.
Fri night..N winds 10 to 15 kt with gusts to 25 kt.
Sat..NE winds 5 to 10 kt.
Sat night..N winds 5 kt.
Sun..Variable winds 5 kt.
Sun night..SE winds 5 kt. A slight chance of showers.
Mon..SE winds 5 to 10 kt. A chance of showers.
Mon night..S winds 10 kt. Showers likely.
Tue..SW winds 10 to 15 kt. A chance of showers.
Tue night..W winds 5 to 10 kt. A chance of showers. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 57 degrees.
AMZ300 859 Pm Est Thu Feb 20 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Developing low pressure offshore will move northeast tonight. High pressure will then move into the area on Friday, bringing cold, drier air through the weekend. Another warm front will move into the area early next week, bringing more rain to the area.


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 210216 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 901 PM EST Thu Feb 20 2020

SYNOPSIS. Developing low pressure offshore will move northeast tonight. High pressure will then move into the area on Friday, bringing cold, drier air through the weekend. Another warm front will move into the area early next week, bringing more rain to the area.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. Objective analysis 21/02z placed low pressure about 250 miles east/northeast of Folly Beach, SC. Rain intensities are slowly waning with time as the low propagates farther out into the open Atlantic. Light precipitation is expected to slowly end from west-east through the night. Precipitation has remained all liquid so far this evening this far to the south. Mid-evening mPing data show a few reports of rain/snow mix and rain/sleet mix as far south as Columbia.

High resolution guidance has trended slightly slower with the ending of the precipitation across the Charleston Tri-County area early Friday and actually show a nice burst of precipitation developing in the Charleston to McClellanville corridor 09-12z per model reflectivity progs. With this slower movement, there is some concern with p-type as temperatures fall into the lower-mid 30s north of the I-26 corridor. High resolution soundings with support from both the 20/18z NAM3km and GFS show there should be just barely enough moisture left over in the favorable dendritic growth zone (DGZ) to support some ice nucleation. Soundings at KCHS, KMKS and Jamestown in the 09-13z time frame show a sub-freezing layer above the boundary layer so expect hydrometers to remain frozen before melting just before reaching the ground. This scenario will support either a rain-snow/flurry mix or possibly a brief burst of very light snow or flurries before as the precipitation moves offshore, mainly along/north of the I-26 corridor. Sleet appears unlikely after 06z as the warm nose noted on the 21/00z KCHS roab cools and the depth of the freezing layer deepens. No impacts are expected given the warm ground temperatures and this should be more of a novelty event this far to the south.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/. High pressure will continue to build into the area through Friday. A strong pressure gradient will support gusty winds up to 25 kts through Friday night into Saturday morning over Lake Moultrie. Temperatures will continue to be below normal, with lows in the upper 20's and low 30's through the weekend. High pressure will then prevail through the weekend, bringing quiet weather. Sunday will see temperatures in the upper 50s/low 60s.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. A warm front is forecast to lift north through the forecast area on Monday as low pressure lifts into the Ohio River Valley. Some rain could accompany the front, but the best rain chances will come late Monday night and Tuesday as a cold front passes through. Another stronger front could approach on Wednesday as a deep upper trough moves into the eastern U.S. Temperatures through the period are expected to be near to above normal.

AVIATION /02Z FRIDAY THROUGH TUESDAY/. High-end IFR to low-end MVFR cigs will linger through the evening before lifting to more solid MVFR after midnight as rain begins to diminish. VSbys of 2-4 miles will persist before returning to P6SM as the rain wanes. There is a slight chance rain could mix with or briefly change to snow at KCHS just before daybreak as the precipitation ends, but there will be no impacts. VFR will return by mid-morning as skies begin to clear. Gusty winds will persist through the 00z TAF period with gusts 20-25 kt at both KSAV and KCHS.

Extended Aviation Outlook: VFR will prevail through the weekend with gusty winds through Friday night. Some restrictions likely starting Monday.

MARINE. Tonight: Solid Small Craft Advisory conditions will give way to Gale Warning conditions outside Charleston Harbor as the pressure gradient intensifies due to low pressure strengthening just east of the waters. We do not have a Gale Warning in Charleston Harbor at this point but certainly can't rule out a few gale force gusts near the mouth of the harbor. Waves will build substantially with 6-9 foot seas beyond the pilot buoys and 10-12 ft out closer to the warm Gulf Stream waters.

Friday through Tuesday: Winds will remain quite gusty through Saturday evening. Gale warnings will be in effect through Friday evening for all Charleston waters except the Charleston Harbor, which has a small craft advisory. As the pressure gradient relaxes, small craft advisories will be needed to replace the gale warnings which should remain in effect until Saturday afternoon/evening for all waters.

No concerns expected Sunday into Monday, however an uptick in winds and seas is possible on Tuesday ahead of the next low pressure system.

TIDES/COASTAL FLOODING. Tide levels in the Charleston Harbor are expected to peak around 7.1 ft MLLW with Friday morning's high tide. A Coastal Flood Advisory could be needed along parts of the lower South Carolina coast.

Strong northeast winds are likely to cause minor coastal flooding with the Friday morning high tide along the SC coast, possibly Saturday morning as well.

EQUIPMENT. There will be a 03Z special sounding released in support of the NASA IMPACTS winter storm project.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . Lake Wind Advisory until 7 PM EST Friday for SCZ045. MARINE . Gale Warning until 5 PM EST Friday for AMZ350-352-354. Gale Warning until 10 PM EST Friday for AMZ374. Small Craft Advisory until 7 PM EST Friday for AMZ330.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 11 mi46 min N 16 G 23 43°F 58°F1022.6 hPa (+1.3)
41029 - Capers Nearshore (CAP 2) 14 mi38 min ENE 25 G 33 44°F 57°F1022.9 hPa
FBIS1 - Folly Island, SC 17 mi46 min NNE 17 G 20 42°F 1022.6 hPa (+1.5)42°F
ACXS1 - ACE Basin Reserve, SC 42 mi61 min N 5.1 40°F 1022 hPa40°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 45 mi61 min NNE 8.9 40°F 1022 hPa38°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 49 mi26 min 29 G 37 69°F1020.2 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC3 mi51 minN 8 G 144.00 miRain39°F39°F100%1022.3 hPa
Charleston, Charleston Air Force Base, SC11 mi1.8 hrsNNE 10 G 192.00 miLight Rain Fog/Mist40°F37°F93%1022.1 hPa
Charleston Executive Airport, SC18 mi51 minN 11 G 195.00 miLight Rain41°F39°F93%1022.3 hPa
Moncks Corner Berkeley County, SC21 mi71 minNE 1110.00 miLight Rain37°F37°F100%1022.7 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrNE8NE8N7NE8N11NE11NE10NE8NE8NE8NE9NE9N9NE14
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1 day agoSE4SE4S3S4SW5NW3Calm3NW6CalmN3CalmCalmCalmNW9N8N13N13NE10NE9NE10NE12NE8NE9
2 days ago--NE4NE5NE5NE5NE5NE3NE4N4N3CalmN4CalmNW4NE3CalmCalmCalmE4CalmE3SE5S5S3

Tide / Current Tables for Cainhoy, Wando River, South Carolina
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Cainhoy
Click for Map
Thu -- 05:12 AM EST     Moonrise
Thu -- 06:37 AM EST     6.43 feet High Tide
Thu -- 06:58 AM EST     Sunrise
Thu -- 12:26 PM EST     0.22 feet Low Tide
Thu -- 03:29 PM EST     Moonset
Thu -- 06:08 PM EST     Sunset
Thu -- 06:48 PM EST     5.37 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.61.734.45.66.36.45.74.42.81.20.30.31.12.23.44.45.25.44.93.82.41

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Thu -- 03:56 AM EST     1.36 knots Max Flood
Thu -- 05:12 AM EST     Moonrise
Thu -- 06:23 AM EST     -0.00 knots Slack
Thu -- 06:57 AM EST     Sunrise
Thu -- 09:24 AM EST     -2.36 knots Max Ebb
Thu -- 12:25 PM EST     0.00 knots Slack
Thu -- 02:20 PM EST     1.17 knots Max Flood
Thu -- 03:29 PM EST     Moonset
Thu -- 06:08 PM EST     Sunset
Thu -- 06:23 PM EST     -0.00 knots Slack
Thu -- 09:41 PM EST     -1.99 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.91.21.31.41.10.4-0.6-1.6-2.3-2.2-1.5-0.50.61.11.110.80.3-0.5-1.2-1.8-2-1.5

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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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.