Sunday, July5, 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 6:15AMSunset 8:32PM Sunday July 5, 2020 12:35 PM EDT (16:35 UTC) Moonrise 8:17PMMoonset 5:30AM Illumination 100% Phase: Full Moon; Moon at 15 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- 1022 Am Edt Sun Jul 5 2020
Rest of today..SE winds 5 kt, increasing to 15 kt.
Tonight..S winds 10 to 15 kt. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight.
Mon..SE winds 5 to 10 kt. Showers and tstms likely.
Mon night..S winds 5 to 10 kt. Showers and tstms likely.
Tue..S winds 5 to 10 kt. Showers and tstms.
Tue night..S winds 5 to 10 kt. Showers and tstms.
Wed..SW winds 5 to 10 kt. Showers and tstms.
Wed night..W winds 5 to 10 kt. A chance of showers and tstms.
Thu..W winds 5 to 10 kt. A chance of showers and tstms.
Thu night..SW winds 5 to 10 kt. A chance of showers and tstms. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 84 degrees.
AMZ300 1022 Am Edt Sun Jul 5 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A stationary front will linger south of the area today, before lifting back north tonight into Monday. Low pressure will then bring unsettled weather to the region for much of the week.


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 051440 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1040 AM EDT Sun Jul 5 2020

SYNOPSIS. A stationary front will linger south of the area today, before lifting back north tonight into Monday. Low pressure will then bring unsettled weather to the region for much of the week.

NEAR TERM /THROUGH TONIGHT/. Morning Update: Radar indicates scattered convection across the GA coastal waters, moving into the coastal GA counties. Based on the current radar trends, we tweaked the POPs to better reflect what's going on this morning and blended it with the afternoon expectations. Likewise, made some changes to the sky cover to match this thinking. The other aspects of the forecast remain on track.

Otherwise, today will mark the change of our weather pattern that becomes more unsettled for the upcoming week.

The stationary front near the Florida-Georgia border will meander south of the area, making some progress northward through the day. This occurs under a regime aloft that feature a broad trough covering the northern Gulf Coast states and the Gulf of Mexico. Deeper moisture will continue to work its way north and gradually scours out the drier air of the past one to two days. PWat climbs to near 2 inches across our central and southern zones, and it is these regions where we have our best convective rain chances.

DPVA will drift into our Georgia counties from the south and southwest, while NVA holds further north. Isentropic lift and low level convergence will also expand northward, allowing for a steady progression north of the convection. With diurnal destabilization the better chances of showers and t-storms will then shift a little further inland this afternoon. For the afternoon we ramp PoPs up to as high as 60-70% south of I-16, with PoPs trending down to 20-30% over Beaufort County and the other South Carolina counties bordering the Savannah River.

Provided there is enough insolation, since there will remain some drier mid level air, the DCAPEs are still forecast as high as 1000 or 1200 J/kg. This could support a risk for a few stronger downbursts of wind, maybe even one or two storms that are marginally severe.

Storm motion is slowly west-northwest, and that along with the elevated moisture content there will be some heavy downpours over our Georgia zones, especially this afternoon. Maybe enough for some localized flooding problems. QPF looks to be 1/4 to 1/2 inch south of I-16, with pockets of higher amounts. Less QPF will be located further north.

The Charleston quad-county area should stay rainfree the entire day, with mostly sunny skies to prevail, as they remain more under the influence of ridging aloft.

Our latest thinking is that 90-94F will be realized north and west sections, with 85-90F most elsewhere. Adjustments could be forthcoming pending the timing and exact coverage of convection.

Tonight: The stationary front will begin a more steady progression northward, probably as it transitions into a warm front that lifts into our Georgia zones early, and eventually into South Carolina late. Short wave energy aloft, upper difluence, and continued forcing from the front will lead to at least scattered showers and t-storms throughout. Highest probabilities will transition to the eastern zones as the night progresses, where we find the best low level convergence and forcing, plus the greatest instability. QPF will be up to 1/4 or 1/3 inch across most places, although the typical locally higher amounts will occur as PWat climbs to 2-2.25 inches. Min temps in the lower-middle 70s will prevail.

SHORT TERM /MONDAY THROUGH WEDNESDAY/. An active period is on tap for the early to middle part of the work week. A very broad mid level low/trough will linger over the Gulf coast states on Monday. At the surface, a weak front will lift north through the forecast area. An initial batch of showers and thunderstorms is forecast to accompany the front as it progresses northward, then highest rain chances will transition more to the southern zones as shortwave energy approaches. It will likely stay fairly active overnight as the front remains the vicinity, although models vary in coverage.

The mid level low will gradually lift northeast into the western Carolinas on Tuesday. An associated surface low will take a similar track, lifting from central Georgia in the morning into or near the area Tuesday night. Deep moisture, noted by PWats of ~2.25 inches, and ample lifting mechanisms in play will allow widespread showers and thunderstorms to develop. Periods of heavy rain will be possible, which will bring an inherent risk for minor flooding.

At the start of the day Wednesday, low pressure will likely be over or near the northern zones, although it's worth noting that there are large discrepancies between models regarding the position and strength of the low. The low should slowly lift to the upper SC coast through the day. Another round of convection is likely with additional heavy rainfall possible. All in all, average forecast rainfall Monday through Wednesday is between 1.5-2.5 inches, however locally higher amounts are likely. Refinements will most certainly be needed.

High temperatures through the period will be cooler than normal, generally in the mid to upper 80s, thanks to rain and widespread cloud cover. Lows overnight will be in the low to mid 70s.

LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/. Surface low pressure will likely be located off the Carolina coast at the start of the period. Large differences regarding the timing and evolution of the low exist between models, leading to a lower confidence forecast. The low should gradually lift northward through late week, although surface troughing will linger over the local area. Kept rain chances fairly middle of the road, with PoPs no higher than 50%. Temperatures will be seasonable.

AVIATION /15Z SUNDAY THROUGH THURSDAY/. KCHS: VFR will prevail through 12Z Monday.

KSAV: A stationary front to the south today will slowly lift north through tonight, leading to an increase in clouds, lowering ceilings and at least a chance of SHRA/TSRA. Until radar trends are more evident we opted to not go anything more than VCTS from 15-20Z, followed by VCSH thereafter. Should any of the convection impact the terminal, then flight restrictions would occur. Brief gusty winds and heavy rains are possible in any of the SHRA/TSRA today.

Extended Aviation Outlook: Flight restrictions likely at times through at least mid week due to showers/thunderstorms.

MARINE. Today and tonight: Weak high pressure across our South Carolina waters today will give way to a stationary front that will transition into a warm front tonight as it lifts north into our Georgia waters. SE and S winds that are generally around 10 kt or less this morning will be SE all areas this afternoon as speeds climb at least to as high as 15 kt with sea breeze influences to occur. Mostly S winds of 10-15 kt are expected tonight. Seas will average 2-3 ft throughout. Mariners can expect at least scattered convection on the Georgia waters today, with little to no activity further north. Then scattered to perhaps numerous showers and t-storms will impact all waters tonight. Any of these storms will produce frequent lightning strikes and heavy rain, and maybe a few of them will produce winds of 30 or 40 kt.

Monday through Friday: A stalled front will linger across the region on Monday, before low pressure passes over or near the area towards the middle of the week. The low should then slowly lift north through late week. Winds and seas will ultimately be dependent on the position of the low, so forecast confidence towards the middle of the week lowers considerably. At this point, conditions are forecast to stay below Small Craft Advisory criteria.

TIDES/COASTAL FLOODING. Astronomical high tides will continue, as the full moon occurs this afternoon. Tidal departures have been running high the past several days, and with onshore winds to prevail, tides will remain well above predicted levels. High enough where we expect the need for another Coastal Flood Advisory for the high tide around 9-10 pm this evening along parts of the South Carolina coast, especially in and near Charleston.

Astronomical influences will maintain higher than normal tide levels through Monday. Minor coastal flooding will be possible around the time of the evening high tide, primarily along the South Carolina coast. In addition, the risk for heavy rain will only add to any tidal flooding.

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

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 11 mi48 min E 6 G 8 83°F 85°F1016.7 hPa
41029 - Capers Nearshore (CAP 2) 14 mi28 min ESE 5.8 G 7.8 83°F 84°F1016.6 hPa
FBIS1 - Folly Island, SC 17 mi36 min E 6 G 7 83°F 1017.1 hPa (+1.2)
ACXS1 - ACE Basin Reserve, SC 42 mi111 min ESE 1.9 86°F 1016 hPa74°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 45 mi111 min ESE 1.9 84°F 1016 hPa73°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 49 mi26 min ESE 5.8 G 7.8 82°F 84°F1016.8 hPa71°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC3 mi41 minESE 610.00 miFair86°F73°F66%1016.3 hPa
Charleston, Charleston Air Force Base, SC11 mi1.7 hrsSE 310.00 miMostly Cloudy84°F71°F65%1015.9 hPa
Charleston Executive Airport, SC18 mi41 minE 610.00 miMostly Cloudy84°F71°F66%1016.6 hPa
Moncks Corner Berkeley County, SC21 mi41 minSE 310.00 miFair86°F69°F59%1016.3 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrCalmSW33SE9SE12S9S8S7S7S5S3S4CalmN3CalmCalmCalmCalmCalmCalmCalmSE3SE3SE3
1 day agoE83N53S8S10S6S9S6S3CalmSW3W3W3W3W3CalmCalmCalmCalmW4N54E6
2 days agoCalmN5N7SE8SE4E7NE8CalmNE4NE3NE3N4NE3CalmCalm--N4NW4CalmNE5N6--E4NE8

Tide / Current Tables for Cainhoy, Wando River, South Carolina
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Cainhoy
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Sun -- 12:44 AM EDT     Full Moon
Sun -- 03:21 AM EDT     -0.14 feet Low Tide
Sun -- 06:16 AM EDT     Sunrise
Sun -- 06:30 AM EDT     Moonset
Sun -- 09:37 AM EDT     5.81 feet High Tide
Sun -- 03:21 PM EDT     -0.37 feet Low Tide
Sun -- 08:31 PM EDT     Sunset
Sun -- 09:17 PM EDT     Moonrise
Sun -- 10:13 PM EDT     7.48 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.72.70.9-0.10.112.43.855.75.853.72.10.6-0.3-0.20.92.54.25.76.97.57.2

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sun -- 12:16 AM EDT     -3.06 knots Max Ebb
Sun -- 12:44 AM EDT     Full Moon
Sun -- 03:23 AM EDT     0.00 knots Slack
Sun -- 05:24 AM EDT     1.51 knots Max Flood
Sun -- 06:17 AM EDT     Sunrise
Sun -- 06:30 AM EDT     Moonset
Sun -- 09:12 AM EDT     -0.00 knots Slack
Sun -- 12:27 PM EDT     -2.37 knots Max Ebb
Sun -- 03:25 PM EDT     0.00 knots Slack
Sun -- 05:57 PM EDT     1.76 knots Max Flood
Sun -- 08:31 PM EDT     Sunset
Sun -- 09:16 PM EDT     Moonrise
Sun -- 09:56 PM EDT     -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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-3-2.8-1.8-0.50.81.51.41.20.90.2-0.8-1.7-2.3-2.3-1.5-0.50.61.51.81.71.51-0.1-1.3

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (12,3,4,5)
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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.