Friday, April10, 2020
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Marine Weather and Tides
Folly Beach, 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 6:53AMSunset 7:47PM Friday April 10, 2020 9:49 AM EDT (13:49 UTC) Moonrise 10:00PMMoonset 7:54AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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- 719 Am Edt Fri Apr 10 2020
.small craft advisory in effect until 5 pm edt this afternoon...
Today..NW winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft. A slight chance of showers this morning.
Tonight..NW winds 10 to 15 kt with gusts to 20 kt, becoming N 5 to 10 kt after midnight.
Sat..NE winds 5 to 10 kt, becoming se in the afternoon.
Sat night..S winds 10 to 15 kt.
Sun..SE winds 15 to 20 kt with gusts to 30 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.
Sun night..S winds 20 to 25 kt with gusts to 35 kt. Waves 2 to 3 ft. Showers likely with a chance of tstms.
Mon..SW winds 20 to 25 kt. Waves 2 to 3 ft. Showers likely with a chance of tstms.
Mon night..W winds 10 to 15 kt.
Tue..NE winds 10 kt.
Tue night..NE winds 5 to 10 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 70 degrees.
AMZ300 719 Am Edt Fri Apr 10 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build over the area through Saturday. A warm front will lift north Saturday night, then a cold front will move through Monday morning. High pressure will briefly rebuild early next week before a coastal low pressure system moves through mid week.


7 Day Forecast for Marine Location Near Folly Beach, SC
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location: 32.66, -79.92     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 101125 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 725 AM EDT Fri Apr 10 2020

SYNOPSIS. High pressure will build over the area through Saturday. A warm front will lift north Saturday night, then a cold front will move through Monday morning. High pressure will briefly rebuild early next week before a coastal low pressure system moves through mid week.

NEAR TERM /THROUGH TONIGHT/. At dawn: Radar shows blossoming returns, but with dew point depressions at 20-25 degrees in many places, it will be hard to get much more than a few drops down to the surface. Cloud bases are primarily around 8 kft, also indicative of the very dry sub-cloud layer. This precipitation will move through quickly and should be all finished by mid morning. Previous discussion continues below.

Today: Aloft, a fast moving shortwave trough will pass through the area this morning within zonal flow as it phases with more prominent trough energy to the north. After this feature moves through in the morning, west-northwest flow will prevail through the remainder of the day. At the surface, the main cold front will be well south of the area by the morning, with high pressure building in from the west through the bulk of the day. The only chance for precipitation will come in the morning thanks to remnant convection associated with the aforementioned shortwave energy aloft. This remnant convection is already on a diminishing trend and should be nothing more than isolated light showers through roughly mid morning. Rain chances are held in the 20 percent range, mainly for southeast Georgia. the afternoon will bring clearing skies and much cooler temperatures. Forecast highs are in the upper 60s for most areas, with some low 70s possible across southeast Georgia mainly along and south of I-16. Northwest winds will become breezy quickly after day break and should gust into the 20-25 mph range through at least the early afternoon hours.

Tonight: The center of high pressure will slide eastward across the Tennessee Valley and into the western Carolinas. Winds will shift around from northerly to become more northeasterly with time. We should see decent radiational cooling conditions, and lows are forecast to be much cooler than recent overnight periods. Temperatures are expected to bottom out around 40 inland, ranging to the mid to upper 40s along the coast. There is some low end potential for frost well inland, but current thinking is that dewpoints will be too low. No frost is mentioned in the forecast and the probability is too low to include in the Hazardous Weather Outlook.

SHORT TERM /SATURDAY THROUGH MONDAY/. Cool and dry high pressure will persist through Saturday with sunny skies and high temps in the 70s. The surface high will move offshore late Saturday while upper shortwave energy approaches from the west. A warm front will lift north into our southeast GA zones late Saturday night, then through the remainder of the area Sunday. Moisture and isentropic ascent will increase from south to north from late Saturday night into Sunday. Most of the guidance is in general agreement that a shortwave will move through the area shortly after daybreak Sunday, providing an additional source of lift. Numerous showers are expected to develop over the area on Sunday with the greatest coverage inland. Scattered thunderstorms will be increasingly likely during the day as Lifted Indices eventually go negative.

Low-level helicity and shear increase along and south of the warm front Sunday morning. However, there will likely be extensive cloud cover during the day, along with the potential for stabilizing rains in the morning. It doesn't appear that enough instability will develop to support a significant severe weather threat on Sunday, especially since the greatest upper forcing will be during the morning. The low-level wind fields will be ramping up on Sunday with 850 mb winds out of the south around 40 kt by Sunday afternoon. Relatively deep mixing will result in breezy to windy conditions on Sunday.

A bit of a lull in precipitation is possible Sunday evening into the overnight hours as most of the forcing pushes north of the area along with the warm front. A potent, albeit weakening upper shortwave will move into the area late Sunday night, pushing a cold front through the area Monday mid-morning. A broken line of strong to severe thunderstorms could move through the area during this time. The timing is unfavorable climatologically, however very strong low-level theta-e advection could yield CAPEs of 500-1,000 J/kg, accompanying 50-70 kt of bulk shear and 0-3 km helicity values of 500-600 m2/s2. 850 mb winds will be quite impressive at 60-70 kt, thus even if no severe weather occurs, breezy conditions will exist through the night.

Showers and tstms associated with the cold front will gradually move off the coast on Monday. Downslope flow behind the front will push high temps into the low 80s Monday.

LONG TERM /MONDAY NIGHT THROUGH THURSDAY/. A series of high pressure systems will move through the central and eastern United States through the period. A coastal low could move up the coast Tuesday night and Wednesday, bringing numerous showers to the area.

AVIATION /12Z FRIDAY THROUGH TUESDAY/. VFR conditions are expected to prevail at KCHS and KSAV through 12z Saturday. A brief period of light rain will be possible at both KCHS and KSAV through about 14z, but no flight category impacts are expected. Northwest winds will become breezy shortly after sunrise, and should gust into the low 20 knot range through the early afternoon hours.

Extended Aviation Outlook: Periodic flight restrictions Sunday into midday Monday as numerous showers and tstms affect the area. Strong winds anticipated Sunday into Monday.

MARINE. Today: Elevated northwest winds are expected this morning through the afternoon behind a departing cold front. Winds should generally top out in the 15-20 knot range, but a few gusts to 25 knots will be possible in the Charleston County waters and the outer Georgia waters. Conditions could be near Small Craft Advisory criteria for a short time, but will hold off on any headlines for now. However, gusts to 25 knots in and around the Charleston Harbor should be more frequent so an advisory has been issued that runs from 8 am through 5 pm. Seas should generally average 2-4 feet, but could be up to 5 feet in the outer waters at times.

Tonight: High pressure will become centered north of the local waters overnight and winds will shift around to more northerly and even northeasterly late. Wind speeds should top out in the 10-15 knot range for the most part. Seas are expected to average 1-3 feet.

Small Craft Advisories will likely be needed Sunday into Monday or Monday night as strong southerly flow precedes a cold front, then seas gradually subside behind the front. Gales may be needed for some of the waters Sunday night into Monday morning when the strongest winds impact the waters.

FIRE WEATHER. Relative humidity values are expected to fall into the 20-25 percent range inland, and the 25-30 percent range closer to the coast this afternoon with frequent northwest wind gusts into the 20-25 mph range. The best combination of low relative humidity and breezy conditions will be late this morning through early this afternoon. We have opted for a Fire Danger Statement for all of southeast Georgia and southeast South Carolina for today given these meteorological conditions and drying fine fuels.

TIDES/COASTAL FLOODING. Offshore winds are expected to reduce tidal departures through the day. The Friday evening high tide will likely peak right around 7 feet MLLW in Charleston Harbor, and a Coastal Flood Advisory could be needed. It seems less likely that Fort Pulaski will approach or reach 9.2 feet MLLW.

Higher than normal tides are expected the next several days due to astronomical influences from the full moon and perigee. Additionally, winds are forecast to be onshore Saturday into Sunday, which could further elevate the tides. As a result, minor coastal flooding is expected with the evening high tides through the weekend and perhaps into Monday.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 5 PM EDT this afternoon for AMZ330.



NEAR TERM . BSH SHORT TERM . JRL LONG TERM . JRL AVIATION . BSH/JRL MARINE . BSH/JRL FIRE WEATHER . BSH TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 2 mi49 min W 7 G 9.9 62°F 1009.8 hPa (+4.0)45°F
CHTS1 8 mi49 min W 7 G 11 64°F 70°F1009.3 hPa (+4.0)
41029 - Capers Nearshore (CAP 2) 19 mi41 min NW 16 G 21 65°F 68°F1008.3 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi64 min WSW 1 60°F 1010 hPa46°F
41033 37 mi41 min WNW 12 G 19 63°F 68°F1009 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 45 mi39 min 16 G 21 68°F 71°F1008.7 hPa59°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC5 mi54 minW 69.00 miPartly Cloudy61°F42°F52%1009.5 hPa
Charleston, Charleston Air Force Base, SC18 mi1.9 hrsWNW 810.00 miLight Rain63°F39°F41%1007.7 hPa
Mount Pleasant Regional-Faison Field, SC18 mi54 minWNW 610.00 miMostly Cloudy64°F39°F40%1008.5 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Tide / Current Tables for Folly Island (outer coast), South Carolina
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Folly Island (outer coast)
Click for Map
Fri -- 04:21 AM EDT     -0.70 feet Low Tide
Fri -- 06:55 AM EDT     Sunrise
Fri -- 08:54 AM EDT     Moonset
Fri -- 10:34 AM EDT     5.57 feet High Tide
Fri -- 04:31 PM EDT     -0.60 feet Low Tide
Fri -- 07:46 PM EDT     Sunset
Fri -- 11:00 PM EDT     Moonrise
Fri -- 11:07 PM EDT     6.44 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.33.71.80.2-0.6-0.50.523.54.75.55.54.83.41.90.4-0.5-0.50.41.93.5566.4

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Fri -- 02:03 AM EDT     -3.41 knots Max Ebb
Fri -- 05:07 AM EDT     0.00 knots Slack
Fri -- 06:55 AM EDT     Sunrise
Fri -- 07:27 AM EDT     2.11 knots Max Flood
Fri -- 08:53 AM EDT     Moonset
Fri -- 11:07 AM EDT     -0.00 knots Slack
Fri -- 02:16 PM EDT     -2.80 knots Max Ebb
Fri -- 05:16 PM EDT     0.00 knots Slack
Fri -- 07:46 PM EDT     Sunset
Fri -- 07:54 PM EDT     2.11 knots Max Flood
Fri -- 11:00 PM EDT     Moonrise
Fri -- 11:45 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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-1.6-2.9-3.4-2.9-1.7-0.21.2221.71.10.2-1.1-2.2-2.8-2.6-1.6-0.40.91.82.11.91.60.9

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 (9,2,3,4)
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Ground Weather Radar Station Charleston, SC
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