Saturday, August15, 2020
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Marine Weather and Tides
Lowndesville, 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 6:50AMSunset 8:19PM Saturday August 15, 2020 4:36 AM EDT (08:36 UTC) Moonrise 2:02AMMoonset 4:55PM Illumination 13% Phase: Waning Crescent; Moon at 26 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 150759 AFDGSP

Area Forecast Discussion National Weather Service Greenville-Spartanburg SC 359 AM EDT Sat Aug 15 2020

SYNOPSIS. Numerous to widespread showers and thunderstorms are expected today and will end overnight tonight. Thunderstorm chances will return to more typical levels for Sunday and Monday, then increase through the week. Highs will be around normal through the first part of the week then fall below normal.

NEAR TERM /THROUGH TONIGHT/. As of 330 AM EDT Saturday: An upper trough can be seen on water vapor imagery slowly drifting east across the TN Valley and will cross the forecast area today. This will provide mid to upper-level DPVA and jet divergence for continued upper support for convection. Meanwhile, a subtle wedge-like boundary has set up across the NC Foothills and Piedmont, and this has focused very heavy rain across Catawba, Burke and Caldwell counties. Numerous rain showers and embedded tstms have also blossomed along the escarpment extending southwest to northern GA. Fortunately so far, outside the current Flash Flood Warnings, rain rates have been manageable. There is some concern that additional flash flooding may develop later later today across the SLY/SWLY upslope areas of the southern NC mountains and the GA/SC mountains, along with the NC piedmont wherever the wedge front sets up. But confidence is still too low for widespread flooding attm, as guidance is not in agreement on placing the heaviest rain. Two limiting factors are that CAPE will remain modest (1000-2000 J/kg) and storms should have decent motion. For now, will leave the Flash Flood Watch as is. Overall, ingredients are still in place for isolated flash flooding across the entire forecast area. Plenty of cloud cover today should keep temps in the upper 70s to mid 80s, which is a little below normal. But it will feel muggy.

The upper trough will shift east of the area tonight, allowing for some drying from the west. But lingering low-level moisture will keep areas of stratus and patchy fog development late tonight. A weak sfc low will track across SC, and will keep things just mixed enough that dense fog is not expected. Lows will be near normal.

SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/. As of 340 AM EDT Saturday: A mid level trof and associated cold front move east of the area Sunday with a drier air mass moving in. Still, there will be some lingering moisture and instability. Isolated diurnal convection will be possible Sunday with scattered convection on Monday. Highs both days will be near or slightly below normal.

LONG TERM /TUESDAY THROUGH FRIDAY/. As of 350 AM EDT Saturday: Another mid level trof is expected to develop to our west for the middle to latter part of next week. This should act to pull deeper moisture back into the area leading to a more active, mainly diurnal, convective pattern. The increased cloud cover and rainfall should keep high temperatures in check and a few degrees below normal through the period for all but Tuesday where temps will be near normal.

AVIATION /08Z SATURDAY THROUGH WEDNESDAY/. At KCLT and Elsewhere: A cluster of tstms continues to impact KHKY to start the 06z TAF, but should rain out and shift north over the next couple of hours. However, overall set up is for expanding SHRA across the area thru the morning hours as an upper disturbance approaches from the west. A weak wedge-like boundary has set up, with IFR cigs north of it across the KHKY area. Not confident it will reach KCLT, but still expect to see some MVFR cigs developing there and across the Upstate sites thru daybreak. Rain moving into the French Broad Valley will support MVFR cigs and possibly vsby. A lull in precip across the Piedmont during the mid-morning thru midday, but showers continue across the mountains. Then another round of widespread convection expected late aftn thru the evening. the aforementioned boundary may set up near KCLT and could result in a few hours of SHRA/TSRA around. So will go with prevailing TSRA from 19-02z at KCLT. Expect very slow drying to begin from the west right around the end of the TAF period, but with low-level moisture persisting. Light and variable winds will be mainly S to SW with any mixing tonight through Saturday, except NW at times in the French Broad Valley tonight. Winds will be briefly gusty near any thunderstorms.

Outlook: Slightly less thunderstorm coverage is expected Sunday and Monday compared to recent days, but perhaps still slightly above normal as low-level moisture continues. An uptick in thunderstorm coverage is then likely Tuesday through Wednesday. Fog and low stratus restrictions will be possible each morning, especially over the usual mountain valleys.

Confidence Table .

08-14Z 14-20Z 20-02Z 02-06Z KCLT Med 73% High 87% High 100% High 87% KGSP High 84% High 91% High 100% High 94% KAVL High 85% High 86% High 93% Med 79% KHKY High 80% Med 77% High 91% Med 77% KGMU High 81% High 91% High 100% High 94% KAND High 81% High 86% 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 are available at the following link:

www.weather.gov/gsp/aviation

GSP WATCHES/WARNINGS/ADVISORIES. GA . None. NC . Flash Flood Watch through this evening for NCZ033-035>037-056- 057-501>506. SC . None.

SYNOPSIS . ARK NEAR TERM . ARK SHORT TERM . RWH LONG TERM . RWH AVIATION . ARK

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHDS1 - Strom Thurmond Dam, SC 46 mi77 min Calm G 1.9 73°F
LMFS1 - Lake Murray SC 74 mi77 min SSW 8 G 9.9 78°F
Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Anderson, Anderson County Airport, SC18 mi41 minN 010.00 miOvercast74°F72°F94%1011.7 hPa

Link to 5 minute data for KAND

Wind History from AND (wind in knots)
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Last 24hrCalmCalmCalmS3SE4S5S5SW5SW6S5CalmCalmSW4SW4SE4S3CalmSW5CalmCalmS5S5SW3Calm
1 day agoN4NE3CalmCalmN3NE4CalmCalm66W7W6CalmSW7SW5CalmCalmCalmE8E6CalmN4CalmN4
2 days agoCalmCalmCalmN3NE4E64N56N4CalmSE4S5SE4E7SE4NE10N18
G24		3SE4N4N3N3Calm
Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS Local Image of    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 Greenville-Spartanburg, SC (4,6,7,8)
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Ground Weather Radar Station Greer, SC
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weather_mapweather_map weather_map

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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 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.