Friday, March22, 2019

Marine Weather and Tides
Charlotte, NC

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:22AMSunset 7:37PM Friday March 22, 2019 10:23 AM EDT (14:23 UTC) Moonrise 8:39PMMoonset 7:41AM Illumination 97% Phase: Waning Gibbous; Moon at 16 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 221056
area forecast discussion
national weather service greenville-spartanburg sc
656 am edt Fri mar 22 2019

Cool and dry high pressure moves over our region from the
great lakes today, and then moves off into the atlantic late in the
weekend as a brief warming trend returns. An area of low pressure is
forecast to track across our area early in the week, bringing the
chance of rain and a few thunderstorms, then dry high pressure
returns for Wednesday.

Near term through tonight
As of 700 am: forecast is on track. Cloud cover within the NW flow
is holding on, but still little, if any, precip falling. A little
concerned about dewpts today, as they are running a few deg below
guidance, and we haven't even started mixing yet. Aftn rh values may
be a little lower than current forecast. See fire wx section below
for fire wx concerns.

As of 315 am: the western side of a double-barreled 500 mb low will
dive southeast across the central appalachians today. This feature
will bring a second shot of strong CAA and increased nwly 850 mb
winds across the CWA today. Despite a modest 1025 mb sfc high
building in behind a departing coastal low pressure system, it looks
to be a breezy to windy day for the fcst area. Winds across the
northern nc mountains will be close to the advisory criteria of 30-
40 mph and gusts of 45-60 mph, while the piedmont looks to have 15-
25 mph and gusts of 25-35 mph, ESP across the nc zones. After
coordination with rnk, have opted to issue a wind advisory for the
northern mountains and adjacent escarpment zones for today through 6
am Saturday. The winds combined with the mixing of dewpts down into
the 20s will result in low rh for most of the lower elevations,
which have fire weather impacts (see fire wx section below).

Otherwise, it should be sunny today (with some lingering stratocu
along the tn border thru late morning). MAX temps will be a little
below normal, ranging from the 40s to upper 50s in the mountains and
in the 60s across the piedmont.

Tonight, the 850 mb CAA will continue, but overall winds should
gradually decrease---first over the piedmont in the evening, then in
the mountains overnight. Temps will be held up somewhat by the
mixing, but still should drop a couple categories below normal
(mainly in the 20s lower 30s mountains and mid to upper 30s

Short term Saturday through Sunday night
As of 245 am edt Friday: overall fairly quiet through most of the
short term, with troughing down the east coast pushing offshore and
giving way to ridging that will build into the area. High pressure
over the midwest to start the period will work is way southeast and
offshore by Sunday morning. Pressure gradient will decrease and flow
will gradually shift back around to the south, so expect a gradual
warming trend through the period... And overall a very pleasant
weekend. The ridge amplitude will decrease as a trough moving off
the rockies damps and lifts toward the great lakes through the
period. Some anemic moisture attendant with this system may move
into the mountains Sunday afternoon and evening, drying up as it
pushes east. A secondary shortwave will dive down behind the trough
Sunday night as a surface low over the ohio valley is forced
southeast, but best forcing with this system will hold off until

Long term Monday through Thursday
As of 300 am est Friday: approaching system will be on our doorstep
Monday morning, passing through the area during the day. Still some
timing differences with the global models on the frontal passage,
but the overall look of the system is fairly similar. By the time it
gets to our area, the shortwave will have weakened to the point that
deep-layer shear certainly leaves something to be desired, but there
might be enough airmass recovery ahead of the front, with afternoon
highs climbing just a hair above seasonal normals, that instability
is able to develop Monday afternoon and evening, possibly lingering
into the early overnight hours. SBCAPE values remain below about
750j kg and generally below 500, so have continued the thunder
wording across most of the area, mainly along and south of i-40.

Moisture dries up fairly quickly but any lingering moisture at the
higher elevations around daybreak Tuesday may switch over to some
brief snow. GFS is a little faster with exiting the precip while
ecmwf holds onto it just a little longer, so a generic blend seems
to work for now.

Behind the front, should see temperatures knocked back down 10-12
degrees for Tuesday with dry high pressure stretching down the
eastern seaboard. Dry conditions with a gradual warming trend
through the end of the period.

Aviation 12z Friday through Tuesday
At kclt and elsewhere: not much change from previous forecast. Still
expect NW winds to pick up after sunrise, with gusts in the 20-30 kt
range at all sites by midday. Gusts will be at their peak during the
aftn hours, then gradually diminish after sunset. Winds at clt will
be close to due west, thanks to a lee trough, but are expected to
favor a slightly north of due west direction thru the day. There is
a low stratocu deck persisting across the nc mountains, briefly
producing an MVFR cig at kavl. Those clouds should gradually
dissipate over the next few hours. Otherwise, mainly skc east of the
mountains thru most of the period.

Outlook: gusty winds will gradually taper off this evening.

Otherwise, expectVFR to prevail into the weekend. The next weather
system will affect the area by Monday, bringing some precip and
chances for restrictions at that time.

Confidence table...

11-17z 17-23z 23-05z 05-06z
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% high 100%
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 mi53 min NNW 8.9 G 20 53°F
LMFS1 - Lake Murray SC 80 mi63 min WNW 6 G 13 46°F 1014.2 hPa

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charlotte, Charlotte / Douglas International Airport, NC6 mi31 minVar 610.00 miA Few Clouds49°F32°F52%1013 hPa
Concord Regional Airport, NC14 mi33 minW 910.00 miFair48°F33°F58%1013.2 hPa
Gastonia Municipal Airport, NC17 mi29 minN 010.00 miFair49°F30°F48%1013 hPa
Monroe, Monroe Airport, NC17 mi30 minW 10 G 1510.00 miFair48°F32°F54%1014.1 hPa
Rock Hill, Rock Hill - York County Airport, SC20 mi29 minWNW 810.00 miFair48°F34°F58%1013.6 hPa

Wind History from CLT (wind in knots)
Last 24hr55SW6W11
1 day agoNE9N12NE9
2 days agoE11

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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GOES Local Image of Mid-Atlantic    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Greenville-Spartanburg, SC (10,2,3,4)
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Ground Weather Radar Station Greer, SC
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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.