Thursday, January21, 2021
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Marine Weather and Tides
Claremont, NC

Version 3.4
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8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:30AMSunset 5:42PM Thursday January 21, 2021 4:01 PM EST (21:01 UTC) Moonrise 12:23PMMoonset 1:07AM Illumination 60% Phase: Waxing Gibbous; Moon at 8 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 Claremont, NC
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location: 35.73, -81.14     debug


Area Discussion for - Greenville-Spartanburg, SC
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FXUS62 KGSP 211944 AFDGSP

Area Forecast Discussion National Weather Service Greenville-Spartanburg SC 244 PM EST Thu Jan 21 2021

SYNOPSIS. A weak cold front will continue tracking across the region this afternoon and evening. This front will stall across the Gulf Coast Friday potentially leading to low rain chances for the southern tier of the CWA. High pressure builds into the region this weekend. Early next week another frontal system will bring better rain chances to the area.

NEAR TERM /THROUGH FRIDAY/. As of 215 PM: The region remains under a fast quasi-zonal flow aloft, though a very shallow trough has now shifted east of the CWA. With that, isentropic upglide has diminished such that shower activity has fizzled out across the CWA. A continuing chance does exist TN/NC border where the westerly flow will keep some chances going until the best moisture advects east of the mtns later today; some faint returns appear on the west side of the Appalachians, from Morristown TN radar. To our immediate south this afternoon--and really through the end of the period tomorrow evening--some weak DPVA may occur at times with pockets of vorticity ejecting from weakening SW CONUS shortwave. This will ride atop a stalled frontal boundary, where abundant low to mid-level moisture remains. A few sprinkles may occur from time to time in the southern third of the CWA as a result. In the mountains, cloud cover has allowed temps to remain chilly, but they have mostly warmed enough to allow precip to change to rain. Some snow or sleet may continue at high elevations via the upslope lift, until finally tapering off later this afternoon.

Whatever breaks in the clouds are present this afternoon appear likely to fill back in by this evening, as abundant alto/cirrus layers precede the aforementioned southern-stream wave. Guidance has mostly backed off QPF, but as noted above a few sprinkles certainly could occur into tomorrow morning, especially in the GA/SC zones. A small chance of measurable precip is retained only in the far south. Low temps will remain above normal, and more importantly well above freezing where precip is plausible. Upper flow will diminish during the day Friday as a sfc high spreads in from the mid-Mississippi Valley, and the cirrus should begin to thin or advect out. Increasing sunshine will allow max temps to rise back into the mid to upper 50s across the lower mtn valleys and NW NC Piedmont, and closer to 60 across the remainder of the Piedmont. Dewpoints will mix out such that RH will drop to 25-30 percent across some of the area, enhancing fire danger slightly, but winds will be light.

SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/. As of 300 PM Thursday: Zonal flow Friday evening will transition into broad weak ridging throughout the day on Saturday as a high pressure system located near the Great Lakes Region builds into the southeastern United States. This will lead to dry conditions and plenty of sunshine along with temps near or just below normal. Saturday night minimal cloud cover will lead to good radiational cooling allowing temps to drop into the mid to low 20s in the foothills and higher elevations, and upper 20s and low 30s elsewhere, a few degrees below normal for this time of year. Sunday morning high pressure should be centered over the Carolinas. However, this high pressure system should track offshore Sunday afternoon into Sunday evening as a low pressure system develops across the Southern Plains. The warm front associated with this low pressure system will lift north over the southeastern United States Sunday afternoon into Sunday night increasing rain chances for the CWA.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. As of 2:30pm EST Thursday: Weather activity will pick-up in the extended with 2 southern upper synoptic systems moving through: the first on Monday, and the second on Wednesday or Thursday. Both of these systems will be on the warm side for this time of year, with precipitation currently looking to be all rain in all parts of the CWA, with the possible exception of a little snow on Wednesday at the higher elevations in North Carolina.

For the first system, the only real differences between GFS and EC models is that the EC weakens the ridge late on Sunday with some small shortwaves and brings some light precipitation into the area prior to the main front later on Monday. For the second system, GFS and EC differ considerably on timing, with the EC nearly a day behind the GFS, not bringing in the second round until Thursday.

FROPA with the first system concurrently looks to be around Monday night, with southwesterly warm and moist advection ahead of it, followed by dry northwesterly advection on Tuesday. Winds continue to veer to northeastward Tuesday evening, creating cold-air-damming (CAD) conditions that look to last through the next system passage Wednesday or Thursday. CAD on Wednesday should preclude the possibility of thunder for the second system, but there is an outside chance for a little thunder late on Monday with some showers that move into the CWA from the west where GFS predicts a small amount of SBCAPE. FROPA should occur behind the second system late on Wednesday or Thursday.

Due to southern track of these 2 systems and consequent southerly flow at times, temperatures will be generally above normal Monday and Tuesday, with CAD creating cloudy and mild conditions on Wednesday.

AVIATION /20Z THURSDAY THROUGH TUESDAY/. At KCLT and elsewhere: Isentropic lift across the area will continue to diminish as a weak cold front settles south by this evening. A few light showers are possible across the mountains this afternoon, possibly falling as mixed RA/SN/IP in the colder valleys, but not likely affecting KAVL. The moisture supply is similarly diminishing with WNW flow above the sfc, and downwind of the Appalachians this means cigs should be high enough not to have much operational impact. Better low-level moisture does remain near KAVL and KAND, so will maintain a chance of restrictions in TEMPO at those sites. Otherwise, expect abundant alto/cirrus decks overnight with high-altitude moisture invof jet streak. Generally SW winds this aftn will veer to WNW or NW overnight but then back again due to weak lee troughing Friday. KAVL is again the exception, seeing continuing NW winds. Precip and restrictions Friday now look to be confined to stalled frontal zone south of the area.

Outlook: VFR Friday should continue into the weekend. Moisture return may bring a restriction back from the south Sunday afternoon, which would continue into early next week.

Confidence Table .

19-01Z 01-07Z 07-13Z 13-18Z KCLT High 100% High 100% High 100% High 100% KGSP High 100% High 100% High 100% High 100% KAVL Med 79% 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 Med 75% High 91% 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 . None. SC . None.

SYNOPSIS . AP NEAR TERM . Wimberley SHORT TERM . AP LONG TERM . WJM AVIATION . Wimberley


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WATS1 - Lake Wateree, SC 99 mi92 min SW 6 G 12 55°F 1009.5 hPa

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Statesville Municipal Airport, NC10 mi67 minSSW 510.00 miMostly Cloudy53°F33°F46%1008.5 hPa
Hickory, Hickory Regional Airport, NC13 mi69 minWNW 810.00 miOvercast54°F38°F55%1007.5 hPa
Lincolnton, Lincolnton-Lincoln County Regional Airport, NC17 mi67 minSSW 310.00 miPartly Cloudy56°F34°F45%1008.8 hPa

Link to 5 minute data for KSVH

Wind History from SVH (wind in knots)
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Last 24hrNW6NW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW5CalmSW3SW6W5W4
1 day agoSW4SW3CalmCalmSW5SW6SW5SW7SW6SW4SW4SW5SW9SW6W5W7W7W8
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2 days agoW12
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W9W5CalmNW7CalmCalmCalmCalmCalmSW3CalmCalmCalmCalmCalmSW3SW3SW3SW4S3S4SW6W9

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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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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.