Monday, March27, 2017

Marine Weather and Tides
Rutherford College, NC

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:17AMSunset 7:46PM Monday March 27, 2017 8:49 AM EDT (12:49 UTC) Moonrise 6:11AMMoonset 6:27PM Illumination 0% Phase: New Moon; Moon at 29 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 Rutherford College, NC
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location: 35.75, -81.54     debug

Area Discussion for - Greenville-Spartanburg, SC
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Fxus62 kgsp 271113
area forecast discussion
national weather service greenville-spartanburg sc
713 am edt Mon mar 27 2017

Moist southerly flow will linger over the southeast through Tuesday,
with several rounds of showers and thunderstorms possible. Drier air
will briefly return by the middle of the week as a cold front
settles south of the area. Another low pressure system will bring
moisture back to the southeast Thursday, increasing rain chances
through late Friday.

Near term /through tonight/
As of 650 am edt: pops have been trimmed back further for the
morning hours given the meager appearance of lingering isolated
showers on radar.

Otherwise, water vapor imagery reveals a cyclonic mid/upper level
circulation moving over missouri early this morning. Low level flow
east of this system is generally south to southwest and this
persistent fetch of gulf moisture across the southeastern states
will yield continued morning clouds and lingering isolated to
scattered showers for our region. This flow regime will continue
across the southeast through the day. The combination of
temperatures warming quickly through the 70s, despite the mostly
cloudy conditions, and dewpoints solidly in the 50s will likely
produce SBCAPE values in the 1000 to 2000 j/kg range this afternoon.

Narrow lobes of vorticity lifting east ahead of the main trough this
afternoon will provide a triggering mechanism for deep convection.

Although thunderstorm coverage will be in the solid scattered range,
several of the storms could be strong to severe as CAPE improves in
the minus 10 to minus 30 c hail growth zone. Relatively modest
spring freezing levels should permit 55 dbz cores reaching the lower
20kft range this afternoon and early evening to yield some
marginally large hail and briefly gusty winds. Fortunately, 850 mb
flow and associated deep layer shear will be less than observed on
Sunday, so cells should not persist as long and a bit less storm
organization is indicated. Will mention the severe potential in the

The deeper forcing will occur with the trough as it crosses the
southern appalachians overnight with better upper jet divergence and
deep layer q vector convergence indicated. However, instability
should be waning a bit overnight and low level flow will start
veering, so this may limit the strong to severe potential somewhat
for the early morning hours. The real question mark will be how well
the more robust convection from the upstream slight to enhanced
severe thunderstorm risk areas is able to survive as it approaches
the mountains. All in all, expect a mild and increasingly wet night.

Short term /Tuesday through Wednesday night/
As of 225 am edt Monday: an ulvl s/w will continue to cross the area
tue and drag a broad cold front east throughout the day. The atmos
will remain unsettled during this time and isol/sct tstms are
probable early on thru the afternoon. The main focusing area for
stronger storms will be east of the mtns as pre-frontal lift
coincides with destabilizing warm sector by 21z. The op models have
varying ideas with the placement of convec and the degree of
instability... But the ERN zones with better sfc TD pooling
associated with increased sfc convg shud be the favored area for
deep convection... Possibly producing a few svr storms. This activity
will wane rather quickly aft FROPA arnd 00z with little if any
showery activity lingering thru the overnight period.

Heights actually begin to rise quickly during the afternoon Tue and
by 12z Wed a deep layered ridge axis will be situated just west of
the fa. A strong subs inversion will engulf the area and prevent
deep convec activity from developing thru the day. There may be some
-shra late and overnight across the NRN zones as a moist wedge
begins to build in. MAX temps will reach 10-12 degrees above normal
in good downslope flow... However td/s will be about 10 degrees
cooler than tue's values. Thus... No good chance will be had to break
the h7 cap in a non/triggered environ. Min temps will remain 8-10
degrees above normal both Tue and Wed nights.

Long term /Thursday through Sunday/
As of 305 am edt Monday: a strong ulvl ridge will cross the ern
conus early Thu thru Fri morning. This will force a cp sfc high off
the mid-atl coast which will ridge south across the fa. This ridge
will bring some glakes moisture which will combine with advecting
llvl atl moisture. Isent lift and increasing precip coverage will
thereby strengthen and hold a wedge in during this time. This will
make for a tricky temp forecast Thu and also the amount of thunder
activity possibly developing across the wedge bndry to the south and
west. For now... Have tstms developing across the far sw/rn zones and
max temps ranging from the u50s NRN piedmont to m70s over the far
srn zones. This could change over the next few fcst packages.

Meanwhile... A strong low pressure system will develop across the
srn plains early Thu and advance toward the oh valley by fri
morning. This feature will bring yet another frontal system to the
area fri. The models agree well with breaking down the sfc wedge
arnd 12z Fri leaving plenty of time for the atmos to destabilize in
a highly dynamic environ... .Possibly producing stg/svr storms along
a retreating tmb. This scenario has a good amount of uncertainty
however as the speed of the cold front or upper s/w could change and
the inherent complexities and uncertainty involved with
frontal/wedge interactions. The front looks to cross east of the
area late Fri and a dry airmass shud build in over the weekend. Max
temps Fri could be tricky as well... But for now have highs reaching
near normal levels. Over the weekend... Highs will likely increase to
about 5 degrees above normal in good insol within a drying column.

Aviation /11z Monday through Friday/
At kclt: only very spotty shower activity is expected nearby this
morning, but MVFR CIGS should settle in and lower through late
morning. Slow improvement to lowerVFR is expected during the early
afternoon. Thunderstorm chances will improve once again after 20z
and continue into the early evening hours. Expect SW winds around 10
kt or less throughout, with a few low end gusts possible this
afternoon. Decreasing nocturnal instability should lead to mainly
showers overnight. MOS is suggesting some ifr early morning ceilings
early Tuesday, but confidence is low at this point.

Elsewhere: isolated shower chances will continue through the morning
hours in persistent, moist southwest flow. Anticipate MVFR level
clouds developing and persisting across the mountains and foothills
before slowly lifting and scattering late morning into early
afternoon. The thunderstorm potential will increase again after 18z
across the mountains and 20z across the foothills. Expect south to
southwest winds throughout at 10 kt or less, with a few low end
afternoon gusts possible. Showers should continue tonight with the
main trough. Ifr CIGS will be possible, but confidence is low so
will keep CIGS MVFR overnight for now.

Outlook: another round of thunderstorms will be possible on Tuesday,
especially near kclt. Continued low level moisture will provide a
good chances of restrictions throughout. Drier conditions should
briefly return during mid-week before another storm system begins
affecting the region Thursday and Friday.

Confidence table...

11-17z 17-23z 23-05z 05-06z
kclt high 87% high 83% high 100% high 100%
kgsp high 87% high 83% high 100% high 83%
kavl high 87% high 100% high 100% low 56%
khky high 87% med 72% high 100% high 87%
kgmu high 81% high 83% high 100% high 83%
kand high 94% high 94% 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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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Morganton-Lenoir Airport, NC6 mi70 minN 00.15 miFog53°F53°F100%1020.7 hPa
Hickory, Hickory Regional Airport, NC9 mi57 minVar 32.00 miFog/Mist56°F55°F100%1017.4 hPa

Wind History from MRN (wind in knots)
Last 24hrSE5SE3SE3CalmSE3CalmS5S5S6SE4SE4CalmSE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmS6S8SW9
2 days agoCalmCalmSW3S5S12

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 (8,2,3,4)
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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.