Thursday, November23, 2017

Marine Weather and Tides
Lowndesville, SC

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:11AMSunset 5:23PM Thursday November 23, 2017 9:57 AM EST (14:57 UTC) Moonrise 11:13AMMoonset 9:46PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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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7 Day Forecast for Marine Location Near Lowndesville, SC
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location: 34.23, -82.66     debug

Area Discussion for - Greenville-Spartanburg, SC
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Fxus62 kgsp 231120
area forecast discussion
national weather service greenville-spartanburg sc
620 am est Thu nov 23 2017

Dry high pressure will persist over the area over the next couple
of days. A fast-moving cold front may bring a few showers to the
mountains Saturday. Another dry surface high builds in thereafter,
persisting into the middle of next week.

Near term through tonight
As of 620 am est Thursday: an upper trough builds into the
southeastern us today. The southerly jet stream flow ahead of this
trough is keeps widespread cirrus over the area this morning. The
cirrus diminishes this afternoon as the trough and jet stream move
east. At the surface, high pressure builds into the area from the ne
as an inverted trough develops over central ga. Southerly low level
flow around the high and trough will bring some shallow low level
moisture into the NE ga and the western upstate. This should create
some stratocu moving north across those areas this morning which
dissipate through the afternoon as the high and trough weaken. All
this to say the dry and mostly sunny but cool forecast continues.

Highs will be around 5 degrees below normal.

Weak high pressure remains over the area tonight as the upper trough
axis moves into the area. Mostly clear skies are expected but
mountain valley fog could develop overnight. Lows will be a few
degrees below normal.

Short term Friday through Sunday night
As of 130 am thu: a weak sfc ridge will sit over the region Friday,
even as a shortwave to our south maintains an area of low pressure
off the southeast coast. Consensus of the operational models is
for this low to remain far enough offshore that only the lowcountry
would be affected by any precip. A small contingent of SREF members
does show precip spreading up into the i-85 corridor, but this
does not lend enough confidence to warrant a mention in the fcst.

Early Saturday, a mature low pressure system will move across
james bay, pulling a broad trough and cold front across the eastern
conus. For several days models have depicted this front as bringing
barely enough moisture to expect precip, and the latest runs
continue the trend. The GFS is the wettest--but it only wrings out
a few hundredths Saturday afternoon evening. A slight chance of
showers has been included as a result. In the wake of the front,
dry high pressure expands into the area through early next week.

Temps will trend warmer from Fri to sat, going from around normal
to about a category above normal. The mtns will see temps turn
colder Saturday night behind the front, with the remainder of
the area not seeing cooler temps until the high builds in Sunday,
resulting in mins a few degrees below normal Mon morning.

Long term Monday through Wednesday
As of 300 am thu: sfc high pressure becomes centered off the east
coast late Monday, turning the flow southerly. Meaningful moisture
return will take some time, though a warming trend will begin
and continue into midweek. The high will lose influence on our
area by Wednesday, though model solutions diverge as to what comes
next. The north american models show a fairly deep trough and cold
front reaching the southern appalachians Wednesday morning. The ec
features separate troughs in the northern and southern streams;
the northern one is timed similar to the one depicted by the
gfs and canadian, but without the pronounced front. The ec's
southern wave then reaches our area Thursday. The fcst package
mainly will reflect the solutions of the north american models,
with pops increasing gradually from Tuesday night onward. Though
temps will be too warm for anything but rain at onset, temps cool
enough by early Thu that snow is mentioned in the mtns.

Aviation 11z Thursday through Monday
At kclt and elsewhere: dry high pressure over the area will result
in mostlyVFR conditions through the period. Clouds should primarily
be limited to sct-ovc high clouds. However, some stratocu in the 040-
050 range will approach kand this morning as a shallow layer of
lower level moisture sneaks into the area in association with an
area of low pressure developing in the eastern gulf of mexico. Ne
winds will continue through the morning but will become light and
variable for the afternoon or even toggle to sse at kavl and khky.

Light and variable winds expected this evening. Better chances for
mountain valley fog Friday morning.

Outlook: expect mainlyVFR through the forecast period as dry cool
conditions prevail.

Confidence table...

11-17z 17-23z 23-05z 05-06z
kclt high 100% high 100% high 100% high 100%
kgsp high 100% high 100% high 100% high 100%
kavl high 100% high 100% high 100% high 100%
khky high 100% high 100% high 100% high 100%
kgmu high 100% high 100% high 100% high 100%
kand high 100% high 100% high 100% high 100%
the percentage reflects the number of guidance members agreeing
with the scheduled TAF issuance flight rule category. Complete hourly
experimental aviation forecast consistency tables and ensemble forecasts
are available at the following link:

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHDS1 - Strom Thurmond Dam, SC 46 mi78 min NNE 7 G 11 45°F
LMFS1 - Lake Murray SC 74 mi38 min NE 2.9 G 8 44°F 1019.3 hPa

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Anderson, Anderson County Airport, SC18 mi2 hrsNE 410.00 miFair40°F28°F65%1020 hPa

Wind History from AND (wind in knots)
Last 24hrNE63CalmCalmCalmS4CalmSE4E3CalmNE6NE7NE8NE8NE7NE7E9E8E6NE5NE4NE5NE4NE7
1 day agoNE5--E4CalmCalmCalmCalmE3CalmCalmE3CalmCalmNE3NW3CalmCalmCalmCalmCalmCalmNW3NE4Calm
2 days agoCalmCalmCalmSW45S4S5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW4NE5NE33NE3

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Southeast    EDIT

Wind Forecast for Greenville-Spartanburg, SC (9,2,3,4)
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Ground Weather Radar Station Greer, SC
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weather_mapweather_map weather_map

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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 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 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.