Tuesday, September28, 2021
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Marine Weather and Tides
Lowndesville, SC

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:22AMSunset 7:20PM Tuesday September 28, 2021 1:40 PM EDT (17:40 UTC) Moonrise 11:13PMMoonset 1:27PM Illumination 52% Phase: Third Quarter Moon; Moon at 22 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 281409 AFDGSP

Area Forecast Discussion National Weather Service Greenville-Spartanburg SC 1009 AM EDT Tue Sep 28 2021

SYNOPSIS. Dry high pressure will persist across the region today, with continued warming temperatures. A back door cold front will approach from the north tonight and enter the region on Wednesday before moving south of the area by late week. Another cold front may approach from the northwest by early next week, with better moisture possible.

NEAR TERM /THROUGH TONIGHT/. As of 1000 AM EDT: No significant changes this update. Fog continues to mix out across the mountain valleys this morning as daytime heating increases. Otherwise, dry high pressure remains in place across the region today, with a persistent lee trough keeping winds mainly southwesterly through the day and allowing the airmass to continue to modify. Aloft, a 500 mb vorticity lobe will pass north of the forecast area today. Increased cloud cover across the northern tier of the forecast area as this feature will mainly act to increase clouds, however cannot completely rule out a stray shower brushing the NW NC Piedmont around midday. Confidence remains too low for any mentionable PoPs given very limited instability. Anticipate maximum temperatures gaining another category over yesterday's values with decent insolation and a warming westerly downslope flow east of the mountains.

Upper heights will build from the west late today through tonight as a backdoor cold front begins to make an approach from the north as it crosses the Virginias. Shallow pre-frontal moisture may spill into the northern mountains overnight on northwesterly upslope flow. Will feature some increasing clouds late in the northern and western mountains, but keep any shower PoPs sub slight chance. Will continue to shade minimum temperatures toward the cooler side of guidance given the recent performance.

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/. As of 200 AM EDT Tuesday: Deep upper trough will set up shop over New England and Atlantic Canada and in return, send an attendant back-door cold front south into the CFWA by the start of the forecast period. Model guidance shows the frontal boundary staggering over the area into early Thursday before exiting south of the CFWA during the second half of the short-term. Any cooler air behind the front will lag just a tad until later Thursday as winds shift to a northerly component. Either way, partly to mostly sunny skies will be in store due to the lack of moisture available with the front's arrival and better forcing staying confined to the Carolina coast. A steep surface based inversion late early each morning may support fog or low clouds focused across the mountains. Highs will be ~5-8 degrees above normal Wednesday, while a downtick of a few degrees will occur Thursday, especially in the northern counties with the front expected to have passed through this portion of the CFWA by peak heating. Overnight lows will be slightly above normal Wednesday night with a similar downtick by a few degrees Thursday night and a noticeable dip in the northern half of the CFWA.

LONG TERM /FRIDAY THROUGH MONDAY/. As of 300 AM EDT Tuesday: Model discrepancy continues during the extended period. Surface high over the Great Lakes region will place the CFWA into a wedge pattern. This wedge-like set up will likely be short-lived as the surface high quickly dives south in the Mid-Atlantic region Saturday into Sunday. Only minor changes to temperatures as nothing in current guidance trends toward a better consensus. Upper ridging will begin to stack over the southeastern CONUS early this weekend before breaking down as embedded shortwaves from the west interacts with the longwave ridge. The GFS continues to be aggressive with this setup as the wedge boundary lifts north and evolves into a warm front with potential precip developing in the vicinity of this boundary by Saturday. This seems a bit far fetched compared to the other deterministic models, so decided to lean towards the ECMWF solution instead. The ECMWF has the aforementioned surface high setting up shop over the area through the weekend and is slower with lifting the wedge configuration over the weekend. This scenario will allow for the CFWA to remain dry through much of the weekend. Both models have a cold front approaching from the west, but gradually encroaches the area with no clear time table for a potential fropa. An active pattern begins to develop by early next week as a broad trough settles over the eastern two-thirds of the CONUS and transports moisture aloft and embedded vort lobes from the southwest. Temperature forecast will be tricky during the medium range, but the synoptic pattern would suggest at or slightly above normal temperatures through much of the period.

AVIATION /14Z TUESDAY THROUGH SATURDAY/. At KCLT and elsewhere: Mountain river valley fog and low stratus continues to spread in the French Broad Valley near KAVL, and a period of IFR vsby and LIFR cigs looks likely through 13Z or 14Z. Lakelands daybreak fog now appears to be a bit less expansive than yesterday so will cap any fall at KAND to 6SM for a couple hours after daybreak. Otherwise, conditions should remain dry today with limited moisture in profiles and any upper support passing the region mainly to the north. Lee troughing will keep southwest winds in place at speeds less than 10 kt, with mainly NW flow continuing at KAVL. Clouds may increase along the spine of the mountains tonight as a backdoor front settles southward toward the area.

Outlook: Mostly VFR conditions are expected to persist through the week, however, mountain valley fog is likely each morning. Moisture may arrive over the weekend with the next approaching front from the northwest.

GSP WATCHES/WARNINGS/ADVISORIES. GA . None. NC . None. SC . None.

SYNOPSIS . DEO NEAR TERM . AP/HG SHORT TERM . CAC LONG TERM . CAC AVIATION . HG


Weather Reporting Stations
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On 03/09/2021 the NDBC primary processing servers were shut off due to a facilities issue. Station pages on the NDBC website are not updating and there is no ETR at this time. We will update this banner as we learn more.
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHDS1 - Strom Thurmond Dam, SC 46 mi80 min N 5.1 G 6
LMFS1 - Lake Murray SC 74 mi80 min SSW 8 G 9.9 78°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Anderson, Anderson County Airport, SC18 mi44 minW 510.00 miFair80°F61°F52%1016.1 hPa

Link to 5 minute data for KAND

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Last 24hrW8CalmW3W4SW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW7SW96W5
1 day agoW7W5SW7W4SW5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW3CalmCalmSW6SW9
2 days agoNW7W106SW5W3S4CalmCalmCalmCalmCalmCalmCalmN6CalmN3CalmCalmCalmCalmCalm346

Tide / Current Tables for
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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