Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Folly Beach, SC

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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 6:48AMSunset 7:55PM Sunday August 25, 2019 1:35 AM EDT (05:35 UTC) Moonrise 12:33AMMoonset 3:01PM Illumination 28% Phase: Waning Crescent; Moon at 24 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- 1250 Am Edt Sun Aug 25 2019
Rest of tonight..NE winds 15 kt with gusts to 20 kt. A chance of showers with a slight chance of tstms.
Sun..NE winds 10 to 15 kt. A chance of showers with a slight chance of tstms in the morning, then a chance of showers and tstms in the afternoon.
Sun night..NE winds 10 to 15 kt. A slight chance of tstms in the evening. A slight chance of showers.
Mon..NE winds 10 kt. A slight chance of showers.
Mon night..NE winds 5 to 10 kt. A slight chance of showers.
Tue..N winds 5 kt, becoming W in the afternoon. A chance of showers and tstms.
Tue night..SW winds 5 kt. A chance of showers and tstms.
Wed..SW winds 5 kt. A chance of showers and tstms.
Wed night..SW winds 5 kt. A chance of showers and tstms.
Thu..NE winds 5 to 10 kt. A chance of showers and tstms.
Thu night..E 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 86 degrees.
AMZ300 1250 Am Edt Sun Aug 25 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will cross through the region tonight, then stall just offshore and south of the region on Sunday. Low pressure is expected to pass well offshore early next week, before another cold front impacts the area later in the 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 250526
afdchs
area forecast discussion
national weather service charleston sc
126 am edt Sun aug 25 2019

Synopsis
A cold front will cross through the region tonight, then stall
just offshore and south of the region on Sunday. Low pressure
is expected to pass well offshore early next week, before
another cold front impacts the area later in the week.

Near term until 6 am this morning
The cold front will continue top push through our georgia
counties before dawn, as a high pressure wedge builds in its
wake. Far offshore is a broad area of low pressure that will
begin to lift northeast and reaches near 30n latitude a few
hundred miles east of jacksonville by 12z Sunday. Low level
convergence and considerable moisture will allow for isolated to
scattered showers near the front, and also along our coastal
corridor, with little to no chance of convection elsewhere.

Widespread stratus trapped within the wedge will create overcast
skies, and temps will drop to 70-75f most communities, with
even a few upper 60s far northwest tier, and mid-upper 70s over
parts of coastal georgia.

Short term 6 am this morning through Tuesday
Sunday and Monday: a cold front will slowly progress to the coast
and likely stall just offshore and or south of the area to start off
the week. As this occurs, a cooler wedge-type pattern will follow,
initially setting up across the midlands Sunday, then eventually
nudging closer to parts of southeast south carolina and inland
southeast georgia on Monday as the quasi-stationary front drifts
further south. The position of the front will dictate most precip
coverage across the area through Monday and also keep any tropical
low development track well offshore over the atlantic. Precip
chances should be highest near the southeast georgia coast on
Sunday, where pwats remain between 2.00-2.25 inches near the
southward moving front. Precip chances could persist into Monday,
mainly across southern most locations near the altamaha river where
moisture lingers behind the front. Overall instability will remain
quite low under cloudy skies both days with little to no threat of
severe weather anticipated. Brief heavy rainfall will be the main
concern given deep moisture levels and weak wind fields in place.

High temps will be a few degrees below normal each day, peaking in
the mid 80s across much of southeast south carolina and mid upper
80s across southeast georgia, warmest near the altamaha river.

Overnight lows should range in the upper 60s lower 70s well inland
to mid upper 70s near the coast.

Tuesday: a quasi-stationary front should remain just south of the
region, but a wedge-like pattern should weaken across the southeast
united states in advance of a mid upper lvl trough of low pressure
and associated sfc cold front approaching from the west. Some
guidance suggests what is left of a large cluster of thunderstorms
currently ongoing across the western gulf of mexico to phase with
the longwave trough before shifting toward the area into midweek
(bringing higher precip chances to the area). Regardless, a
developing southwest sfc flow should advect deeper moisture to the
region while mid upper lvl forcing and the sfc front arrive late,
likely after sunset. Given the anticipated pattern, scattered to
numerous showers and or thunderstorms are possible later in the day,
highest chances west of i-95. Temps should warm a few degrees more
than the previous day with highs generally ranging in the mid upper
80s (coolest along the coast) to around 90 degrees across inland
locations of southeast georgia.

Long term Tuesday night through Saturday
A tropical low off the mid-atlantic coast Tuesday night will
continue to lift northeast away from the region on Wednesday.

Another cold front is forecast to cross the area later Wednesday or
Thursday. The front will likely stall off the coast through late
week while high pressure builds inland. Given the front lingering in
the vicinity, rain chances will remain in the forecast. Highest pops
will be near the coast. Temperatures are expected to be near normal.

Aviation 06z Sunday through Thursday
In the wake of a cold font, a strong high pressure wedge will
create a low level inversion that traps considerable moisture
underneath. This leads to ifr ceilings at kchs and ksav through
at least 14z. The inversion lifts enough during the late morning
and afternoon into Sunday night, which should lead to MVFR
ceilings and eventuallyVFR ceilings. Our confidence on exactly
when this will happen is no more than moderate, so adjustments
could be required in later forecasts. Also, kchs is positioned
between the wedge of high pressure to the west and a possible
developing low near the gulf stream. This will create a decent
pressure gradient, resulting in occasional gusty NE winds
during the day.

Extended aviation outlook: flight restrictions are possible at both
chs and sav terminals into Monday, mainly due to lower cloud ceilings
and showers associated with a building wedge-type pattern across
the area early next week. Brief flight restrictions will also be
possible with showers thunderstorms ahead of an approaching cold
front Tuesday into the middle of next week.

Marine
Overnight: the cold front continues its march southward at a
steady clip, and will pass into the georgia waters before
daybreak, and then south of all waters by sunrise. A tightening
of the gradient with the inland wedge and broad low pressure off
to the south-southeast of the area will generate increasing
winds and building seas. We have small craft advisory conditions
on the amz350 waters, for NE winds of 15-20 kt with gusts of 25
kt and seas of 3-5 ft. On the other waters conditions will stay
below advisory limits, but we did raise NE winds and seas from
the previous forecast. Mariners can expect a few strong t-storms
to occur, with lightning strikes and heavy rains.

Sunday through Thursday: high pressure will build across inland
areas behind a cold front shifting south of the area early next week
while tropical low pressure tracks well east of the area offshore.

The pattern will likely result in a tightening pressure gradient
over coastal waters Sunday and Monday, favoring north northeast
winds 15-20 kts and seas building up to 4-5 ft. Conditions could
approach small craft advisory levels for a period on Sunday or
Monday before the tropical low departs north northeast of the region
Tuesday. Conditions will then remain well below small craft advisory
levels through midweek.

Rip currents: increasing east northeast winds could contribute to an
enhanced risk of rip currents on area beaches late this weekend into
early next week, especially if tropical low pressure intensifies
while tracking well offshore.

Tides coastal flooding
Astronomical tides will be running close to minor coastal flood
advisory levels next week and onshore winds could lead to even
higher tides, mainly during the evening high tide cycles starting
Monday. In addition, there is the potential for some heavy rain
around the times of high tide which could exacerbate any flooding
issues.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory from 5 am early this morning to 6 am edt
Monday 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
FBIS1 - Folly Island, SC 2 mi36 min N 14 G 17 76°F 1017.5 hPa (+0.5)75°F
CHTS1 8 mi48 min NNW 8.9 G 12 76°F 86°F1017.4 hPa
41029 - Capers Nearshore (CAP 2) 19 mi88 min NE 18 G 23 78°F 85°F1016.7 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi111 min N 2.9 77°F 1017 hPa76°F
41033 37 mi88 min NE 16 G 19 80°F 85°F1016.2 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 45 mi36 min ENE 5.8 G 9.7 82°F 1015.7 hPa (-0.3)76°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC5 mi4 hrsN 010.00 miMostly Cloudy81°F77°F89%1016.6 hPa
Charleston, Charleston Air Force Base, SC18 mi2.7 hrsNNE 910.00 miLight Rain75°F73°F94%1017.2 hPa
Mount Pleasant Regional-Faison Field, SC18 mi4 hrsVar 39.00 miOvercast79°F77°F94%1016.6 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrNW10CalmE4N4N3NE3NE6NE5NE6N6NE5N9NE6N4NE6NE6NE5E11SE6NE7N9NE9N9N11
1 day agoS3S4CalmCalmSW3CalmW3W6W6S5W4W4W6S8S13S8S9S8S7S3S3S4CalmW4
2 days agoS6S4SW5SW5W3W3W5W7SW10W95SW7SW8S6SW10SW6S4S6S8S6S4S6S6SW5

Tide / Current Tables for Folly Island (outer coast), South Carolina
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Folly Island (outer coast)
Click for Map
Sun -- 01:33 AM EDT     Moonrise
Sun -- 03:18 AM EDT     4.59 feet High Tide
Sun -- 06:49 AM EDT     Sunrise
Sun -- 09:38 AM EDT     0.66 feet Low Tide
Sun -- 04:00 PM EDT     Moonset
Sun -- 04:05 PM EDT     5.70 feet High Tide
Sun -- 07:53 PM EDT     Sunset
Sun -- 10:32 PM EDT     1.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.83.74.34.64.543.12.11.30.80.71.22.33.64.75.45.75.54.73.72.71.81.21.2

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sun -- 12:38 AM EDT     1.19 knots Max Flood
Sun -- 01:32 AM EDT     Moonrise
Sun -- 03:36 AM EDT     -0.00 knots Slack
Sun -- 06:49 AM EDT     Sunrise
Sun -- 07:17 AM EDT     -1.79 knots Max Ebb
Sun -- 10:19 AM EDT     0.00 knots Slack
Sun -- 01:04 PM EDT     1.64 knots Max Flood
Sun -- 04:00 PM EDT     Moonset
Sun -- 04:44 PM EDT     -0.00 knots Slack
Sun -- 07:53 PM EDT     Sunset
Sun -- 08:14 PM EDT     -2.11 knots Max Ebb
Sun -- 11:25 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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1.11.10.70.3-0.2-0.9-1.5-1.8-1.7-1.1-0.30.51.31.61.40.90.5-0.2-1.1-1.7-2.1-1.9-1.2-0.4

Weather Map and Satellite Images
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wmap_A
GOES 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 (1,6,7,8)
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Ground Weather Radar Station Charleston, SC
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Disclaimer:
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 numerious 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.