Wednesday, June28, 2017

Marine Weather and Tides
Charlotte, NC

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 6:10AMSunset 8:43PM Wednesday June 28, 2017 1:24 PM EDT (17:24 UTC) Moonrise 10:10AMMoonset 11:24PM Illumination 22% 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 Charlotte, NC
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location: 35.21, -80.83     debug

Area Discussion for - Greenville-Spartanburg, SC
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Fxus62 kgsp 281452
area forecast discussion
national weather service greenville-spartanburg sc
1052 am edt Wed jun 28 2017

Dry and cool high pressure will continue today, but will move off
the east coast on Thursday. Warm and moist air will move north from
the gulf through the weekend, bringing back the summer heat as well
as a daily chance of afternoon and evening showers and
thunderstorms through the independence day holiday.

Near term through tonight
As of 1045 am Wednesday: heights will continue to gradually rise over
the region as the upper trof lifts farther to our NE today and
tonight and broad upper ridging begins to build to our south. At the
sfc, high pressure currently centered just to our north will slowly
slide eastward thru the day and then move offshore later tonight and
early tomorrow. This will cause low-lvl winds to veer around to sely
later today and then more sly by early tomorrow bringing a more
typical moist, summertime airmass to the region. As for the sensible
wx, continued low rh thru a deep layer will keep mostly clear skies
over the cwfa with just a few fair wx cumulus breaking out during
the afternoon. Sly flow and abundant sunshine will allow temps to
top out about 2 to 4 degrees warmer today than yesterday.

Short term Thursday through Friday night
As of 230 am edt Wednesday: the surface high will be off the nc va
coasts as we begin the short term. A weakness aloft over the lower
ms valley combined with the return moisture flow from the gulf
around the western periphery of the high will allow precip to being
to lift north into the deep south as isentropic upglide increases
during the day. Best rain chances will generally be across the upper
savannah valley, closer to the deep moisture associated with the
upper weakness, but with widespread cloud cover continuing the trend
of below-normal high temps.

Meanwhile a northern stream shortwave will cross the great lakes on
Thursday, dragging a weak front through the upper midwest and toward
the ohio valley Thursday night. As the surface high moves farther
out into the atlantic, another, deeper wave will dive out of canada,
with these systems beginning to phase. Temperatures will increase
only incrementally Friday afternoon due to continued cloud cover,
but we'll really feel the additional surface moisture in the form of
increased overnight lows, which will return back to seasonal normals
by Friday morning and a couple of degrees above for Saturday
morning. Convection chances ramp up rapidly on Friday as all this
moisture pushes into the area, but with moderate instability
(limited by less surface heating than usual on a summer afternoon)
and no shear, expected pulse thunderstorms with slightly better
coverage than usual especially across the western half of the area.

Long term Saturday through Tuesday
As of 245 am edt Wednesday: the wave moving across the northern tier
will phase with the lower ms valley weakness around the start of the
period, merging into a longwave trough which puts us in diffluent sw
flow aloft. Attendant cold front will be stretched down the ohio
valley and we will remain solidly in the warm sector, with continued
enhancement to diurnal convection expected on Saturday. As for
severe potential, still no real shear to speak of even on Saturday
with the front nearby, but sbcapes increase to >2000j kg by peak
heating Saturday across the piedmont, so that plus increased pws
(water loading) may lead to a slightly higher threat for damaging
winds, but not markedly so.

The front is now progged by global models to pass through the area
Saturday night, but don't let that fool you - between NW downsloping
surface flow off the mountains plus a bit of clearing out of cloud
cover, temperatures on Sunday will rise back to seasonal normals
across the area, and though dewpoints will decrease behind the
front, not enough to wipe out any pop chances. So in this case,
Sunday actually looks like a fairly typical summer day with diurnal
pops... Just with NW surface winds instead of S sw.

The front will slowly meander offshore Monday and independence day,
and by this time strongly mixed boundary layer should bring
dewpoints down further at least on Monday, somewhat limiting typical
diurnal convection. By the independence day holiday, we are looking
at highs 2-3 degrees above seasonal normals (we knew this couldn't
last forever), but with convection chances increasing again as
another shortwave pushes down the ms valley.

Aviation 15z Wednesday through Sunday
At kclt and elsewhere:VFR conditions expected thru 12z TAF period.

The latest IR imagery continues to show patchy stratus in the 6 to
8kft range streaming across northern georgia and the upstate. The
stratus will likely persist for a few more hours until we get some
insolation and the near-sfc inversion erodes. Winds will gradually
veer around to sely by midday as high pressure settles east of the
region and become more sly by early Thursday as the high begins to
move offshore. Some patchy cumulus will likely develop during the
afternoon, but coverage will remain limited.

Outlook: moist, sly return flow will develop around the offshore
ridge on Thursday. As a result, typical summertime conditions will
return by the end of the work week, with mainly late afternoon evening
shra tsra causing possible restrictions through the weekend.

Confidence table...

15-21z 21-03z 03-09z 09-12z
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% med 66%
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
WATS1 - Lake Wateree, SC 61 mi55 min ESE 5.1 G 8.9 81°F
LMFS1 - Lake Murray SC 80 mi65 min E 8 G 12 80°F 1021.3 hPa

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charlotte, Charlotte / Douglas International Airport, NC6 mi33 minNE 410.00 miA Few Clouds80°F53°F39%1022.5 hPa
Concord Regional Airport, NC14 mi35 minE 410.00 miFair79°F51°F39%1024.4 hPa
Gastonia Municipal Airport, NC17 mi31 minN 510.00 miFair81°F54°F39%1022.7 hPa
Monroe, Monroe Airport, NC17 mi32 minVar 510.00 miFair80°F50°F35%1022.8 hPa
Rock Hill, Rock Hill - York County Airport, SC20 mi31 minVar 410.00 miFair81°F54°F39%1022.2 hPa

Wind History from CLT (wind in knots)
Last 24hrN4NE5NE7N7N7N7NE5N4NE54CalmCalmN3N3N7N5N3W4CalmNE6E6NE55NE4
1 day ago4N7S46Calm5SW4S6SW3S5CalmCalmW4NW3CalmN6CalmN3CalmN5N10
2 days agoNE4N9

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 Mid-Atlantic    EDIT

Wind Forecast for Greenville-Spartanburg, SC (13,3,4,5)
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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.