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Marine Weather and Tides
Version 3.4 |
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 6:53AM | Sunset 8:14PM | Tuesday August 20, 2019 9:36 PM EDT (01:36 UTC) | Moonrise 10:13PM | Moonset 10:21AM | Illumination 71% |  |
7 Day Forecast for Marine Location Near Lowndesville, SC
Hourly EDIT Helplocation: 34.23, -82.66 debug
Area Discussion for - Greenville-Spartanburg, SC
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus62 kgsp 210003 afdgsp area forecast discussion national weather service greenville-spartanburg sc 803 pm edt Tue aug 20 2019 Synopsis An area of low pressure and elevated moisture will persist across the western carolinas and northeast georgia through Wednesday. A cold front will approach the region Thursday and become stationary over the area on Friday. The front will gradually settle south of the region through the weekend as high pressure builds in from the north and maintains cooler than normal temperatures. Moisture could linger behind the front. Near term through Wednesday As of 750 pm: a weak upper low over the region has provided enough shear for relatively low-topped if not long-lived cells this afternoon. With diurnal instability on the decline, coverage has diminished, but new development could still occur much of the night with modest lapse rates aloft, and the aid of weak WAA occurring in the low levels. This is most likely over the lower piedmont, southeast of i-85. Sfc-based convection looks unlikely overnight, and effective shear drops below 20 kt in most places, so while storms may continue to exhibit some rotation, we don't expect any more "cold air funnels" as was reported earlier today. The upper low starts to get absorbed into the upper trough moving over the mid-atlantic early Wed morning. Fcst soundings continue to suggest stratus development within the aforementioned waa overnight, along with patchy areas of fog development as well. Given anticipated cloud cover overnight, once again, expect overnight min temperatures to remain above normal. On Wednesday, expect the unsettled weather pattern to continue, as a cold front continues to very slowly approach the area from the nw (though not entering the fa during the forecast period). Low level wsw flow will supply plenty of moisture in across the area, with weak upper troughing swinging through just to the north. Latest guidance continues to prog a few pieces of S W energy moving overhead throughout the day, with some available instability in place. MAX temperatures will climb to normal, with some locations possibly reaching a degree or two above normal. Short term Wednesday night through Friday As of 200 pm edt Tuesday: broad troughing will remain in place as we begin the short term, with surface front extending from a low in southwestern quebec. Plentiful moisture across the area plus the lift associated with the front will lead to enhanced pops especially across the mountains by Thursday afternoon, especially as an area of channeled vorticity works up the oh valley toward the appalachians with associated additional moisture. This wave will serve to elongate the upper trough over eastern canada, with the axis stretching toward the upper midwest, which will rotate around toward the appalachians as the wavetrain pushest east into Friday. The surface trough will remain stalled across the area but precip will be enhanced again Friday as the shortwave rotates around. Expect instability to rise to fairly respectable levels both days, 1500- 2500 j kg depending on which model you prefer, but deep-layer shear will be minimal to nonexistant. Storms shouldn't be particularly organized without the shear and there should be some movement given the upper flow, but with the abundant moisture (pw over 2" Thursday afternoon and even higher Friday), wpc marginal for excessive rain Friday looks well-placed. Should see a decreasing trend in temperatures through the period, from maybe a hair above seasonal normals to a hair below with the |
increasing moisture and the front laying out across the area. Long term Friday night through Tuesday As of 230 pm edt Tuesday: extended begins Friday evening with the channeled vort MAX shortwave sliding down to the area and basically stalling through the weekend as it dissipates. Strong surface high over southeast canada by this point will try to dam down the appalachians, though not very strongly for Saturday. Plentiful cloud cover and moisture will lead to a cooling trend with showers and a few thunderstorms possible, depending on where the potential wedge front sets up (gfs is farther south than the ecmwf). Temperatures will be noticeably cooler Saturday afternoon, lower mid 80s across the upstate and cooler elsewhere, a good 5-8 degrees below normal. As we move into Sunday, the damming becomes much more pronounced on the global models, and expect to see afternoon highs drop another few degrees, by this time maybe 10 degrees below normal. Highest pops will be concentrated in S and W zones around the strongest damming, and may need to trend downward with later updates for pops in the NW piedmont. By Monday we'll be losing the support from the parent high, leaving us more in just a residual cool pool. Beyond that going into the new day 7, a lot of uncertainty with model guidance diverging, but have trended slightly warmer and still fairly wet. Overall through the period, though wet, not really a huge soaker with storm-total precip for now maxing out just over 3 inches in the typical upslope areas of the SW mountains. Adding the short term to that and we could probably see widespread 2-3" with isolated 4+", but over a 6-day period right now it doesn't look too bad, rather just some relief from the drying conditions that have begun to emerge. Aviation 00z Wednesday through Sunday At kclt and elsewhere: weak upper low spinning over the area will maintain a few shra or even tsra this evening, with the most likely areas being on the periphery of the current activity. Only kclt has a mentionable chance; aided by weak near-sfc WAA this chance persists into the early morning there. Also as a result of the waa, low stratus is expected to develop over the nc piedmont before daybreak. Some patches of ifr are possible, but MVFR is more likely to prevail. A small chance exists this cloud deck will affect the northern upstate as well. Elsewhere, mountain valley fog stratus are anticipated, including kavl. The upper low should get absorbed into an approaching shortwave trough on Wednesday, which settles over the area ahead of a cold front. This will enhance diurnal tsra chances--possibly coming in multiple rounds. The period of peak chance is handled with a prob30, beginning at midday over the mountains and in the aftn across the piedmont. Outlook: shra tsra chances will increase with a cold front Thursday and Friday, remaining elevated thru the weekend as the front stalls. Some areas of morning fog and low stratus will be possible each day. Confidence table... 00-06z 06-12z 12-18z 18-00z kclt high 97% high 83% high 95% high 100% kgsp high 97% high 80% high 92% high 100% kavl high 100% high 83% high 90% high 100% khky high 96% high 83% high 93% high 100% kgmu high 96% med 74% high 93% high 100% kand high 100% high 97% high 94% 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
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| CHDS1 - Strom Thurmond Dam, SC | 46 mi | 76 min | Calm G 5.1 | 80°F | ||||
| LMFS1 - Lake Murray SC | 74 mi | 76 min | SW 1.9 G 2.9 | 81°F | 1017.6 hPa |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Anderson, Anderson County Airport, SC | 18 mi | 1.7 hrs | SSE 3 | 10.00 mi | Fair | 79°F | 72°F | 79% | 1017.9 hPa |
Link to 5 minute data for KAND
Wind History from AND (wind in knots)
| 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | |
| Last 24hr | W | N | N | SW | Calm | Calm | NE | Calm | Calm | Calm | Calm | S | SE | SE | SW G20 | NE | E | SE | S | S | S | Calm | ||
| 1 day ago | E | NW | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | SW | Calm | S | Calm | Calm | Calm | SE | N | NW G18 | W | E | Calm | ||
| 2 days ago | E | E | E | Calm | Calm | NE | NE | Calm | E | Calm | Calm | S | Calm | Calm | SW | SE | N G15 | NE | N | SW | SE |
Tide / Current Tables for
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Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Greenville-Spartanburg, SC (21,6,7,8)
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Ground Weather Radar Station Greer, SC
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