Sunday, August25, 2019

Marine Weather and Tides
Lake Norman of Catawba, NC

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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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Sunrise 6:48AMSunset 8:01PM Sunday August 25, 2019 12:20 PM EDT (16:20 UTC) Moonrise 12:30AMMoonset 3:13PM Illumination 24% Phase: Waning Crescent; Moon at 25 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 Lake Norman of Catawba, NC
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location: 35.6, -80.98     debug

Area Discussion for - Greenville-Spartanburg, SC
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Fxus62 kgsp 251424
area forecast discussion
national weather service greenville-spartanburg sc
1024 am edt Sun aug 25 2019

A cool wedge of high pressure will linger across the region into
Monday. Warmer air and increased shower chances are on tap ahead of
an approaching cold front Tuesday and Wednesday. Drier weather is
possible behind the front to end the work week.

Near term through tonight
As of 10:15 am edt: only minor tweaks were made to the near-term
fcst for this update. So far, we remain shower free across the cwfa
with some patchy showers currently over the tenn ga border and a few
to our south. Cloud cover has filled back in over the past hour or 2
with most sites reporting bkn to ovc CIGS in the 1500 to 3000ft
range, although some sites remainVFR. The parent high of our
ongoing cad event is centered near the east end of the us-canada
border. The wedge boundary looks to have pushed as far south as i-20
in sc, curving up into north central ga. Isentropic lift above the
wedge is minimal--winds are northerly aloft--which is likely
responsible for the loss of the low cloud in the deeper part of the
wedge. Most areas are expected to stay dry thru tonight to boot.

Near the escarpment, easterly sfc flow will give an upslope boost
and a small pop continues to be warranted today, and the SW nc
mountains have a small chance of sfc-based convection this aftn,
with heavy rainfall being the main threat from those. The upglide o,
and the midlevels subsequently dry. This leads model guidance to
depict lifting CIGS and perhaps breaks in the clouds that will
permit MAX temps mainly in the 70s for the piedmont; temps overall
will be much more uniform than yesterday, when the immature wedge
brought a remarkable temp gradient across the area.

Low-level flow veers to a more typical southeasterly direction
tonight, with moist upglide reinforcing cloud cover but still not
looking likely to produce much pop on its own. The approach of
a shortwave from the lower mississippi valley warrants a gradual
uptick in pops over the western zones overnight. Piedmont mins will
be mainly in the mid to upper 60s, with lower 60s in the mountain
valleys and northern foothills.

Short term Monday through Tuesday night
As of 308 am edt Sunday: the early part of the week still looks
complicated with all the interaction between an upper level
block over northeastern north america, a potential tropical or
sub-tropical low pressure off the carolina coast, and a short wave
lifting northeast across the tn oh valleys. The upper block to our
northeast will continue to support parent sfc high pressure wedging
down the east side of the appalachian mountain chain through Monday
and Monday night. The high will conspire with the low pressure
system off the nc coast to keep conditions relatively inhospitable
to convection east of the mtns as the short wave lifts past to our
nw. Thus, we keep the more meaningful precip chances over the mtns
into Monday evening. Eventually, this arrangement will facilitate
the draining of the old wedge on Tuesday as we lose the strength
of the parent high. Instability will creep back from the S SW by
afternoon, allowing a better chance for convection, at least over
the SRN half of the fcst area. The fcst follows closer to the nam
with its better coverage of precip by afternoon, but this could
easily be overdone. High temps will remain on the cool side of
normal... By about ten degrees.

Long term Wednesday through Saturday
As of 326 am edt Sunday: not much change to earlier thinking that
by Wednesday, any lingering affect from the remnant wedge will
have ended as a sfc front approaches from the west. Temps ought
to rebound close to normal, which means a return to the usual
summertime instability that will fuel scattered thunderstorms
Wednesday afternoon and evening. The front should cross the region
Wednesday night as it is driven east by an advancing upper trof. The
latest guidance has more of a drying trend behind the front for
the latter half of the week as sprawling high pressure builds in
from the west. So, precip chances were cut back to give us a few
dry days. Temps should be close to normal.

Aviation 15z Sunday through Thursday
At kclt and elsewhere: cold-air damming ongoing across the area will
maintain CIGS into this afternoon, with breezy NE winds. Drying of
the cloud layer from the top down should permit increased insolation
and further lifting for a time this afternoon. Upglide over the
wedge looks to be very weak tonight; model trends reflect this
by favoring less restrictive conditions tonight than previously
progged. However enough lift should be present for at least a
lowVFR cig at all site--plus MVFR at kavl due to upsloping, and
at kand due to its proximity to the better forcing near the wedge
front. Precip chances are too low to mention; some patchy -dz could
occur at any time near the east-facing slopes NE and SW of kavl.

Outlook: expect improving conditions going into Monday as drier
air moves in, however moisture and another frontal system move
back in by midweek with associated restrictions possible again.

Confidence table...

14-20z 20-02z 02-08z 08-12z
kclt high 89% high 100% high 100% high 100%
kgsp high 89% high 100% med 66% high 100%
kavl high 87% high 97% med 68% med 77%
khky high 84% high 100% high 100% high 96%
kgmu high 86% high 100% low 55% high 100%
kand high 89% high 100% med 68% med 78%
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 89 mi50 min NNE 4.1 G 8 75°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Statesville Municipal Airport, NC11 mi25 minNE 610.00 miOvercast69°F61°F76%1022 hPa
Lincolnton, Lincolnton-Lincoln County Regional Airport, NC13 mi25 minNE 310.00 miOvercast70°F60°F73%1022 hPa
Concord Regional Airport, NC20 mi30 minNE 910.00 miOvercast72°F62°F73%1022.3 hPa
Hickory, Hickory Regional Airport, NC24 mi27 minENE 610.00 miOvercast70°F60°F71%1020.4 hPa

Link to 5 minute data for KSVH

Wind History from SVH (wind in knots)
Last 24hrN9NE10NE10
1 day agoW5W5SW4S3CalmCalmSW4SE3E3CalmS4CalmCalmCalmCalmE3NE5NE7NE8NE6NE7NE7NE9NE8
2 days agoCalmSE5S9N8NW6CalmCalmCalmCalmCalmCalmSW4NW6E12CalmSW5CalmCalmCalmW3SW4S4S3SW6

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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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.
Link to Loop

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Wind Forecast for Greenville-Spartanburg, SC (12,3,4,5)
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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.