Tuesday, November20, 2018 L-36.com


Marine Weather and Tides
Bethel Park, PA

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 7:11AMSunset 5:00PM Tuesday November 20, 2018 2:18 PM EST (19:18 UTC) Moonrise 3:53PMMoonset 4:04AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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 Bethel Park , PA
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location: 40.34, -80.02     debug


Area Discussion for - Pittsburgh, PA
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Fxus61 kpbz 201753 aac
afdpbz
area forecast discussion... Updated
national weather service pittsburgh pa
1253 pm est Tue nov 20 2018

Synopsis
A series of upper air disturbances and a arctic cold front
Wednesday bring off and on snow showers. Near record breaking
cold will arrive for thanksgiving day. A low pressure system
arriving Saturday could bring a wintry mix. Temperatures will be
below normal through Friday then a brief warm up back above
normal.

Near term until 6 pm this evening
The longwave pattern of days past continues, with an ern-conus
trough and wrn-conus ridge. Little change in this configuration
is expected for the next couple of days.

A shortwave trough moving ewd across the ERN great lakes today
will support a region of light snow in the i-80 corridor and in
the ridges. The wave will drive a subtle cold front swd across
lake erie, leading to a brief period of onshore wind amid
steepening low-level lapse rates. This combination will yield
deeper instability and a short window for vigorous snow showers
in the NRN zones. High pops were retained thru the afternoon in
both locations owing to the upper-level support provided by the
shortwave trough.

Short term 6 pm this evening through Thursday night
The ern-conus trough will amplify in response to an amplifying
wrn-conus ridge that will shift slightly ewd tonight and wed.

Cyclogenesis NW of the great lakes region will produce a sfc
low that will deepen rapidly and shift ewd across sern canada
by Wed afternoon.

Cold air will funnel into the region as this system passes to
the north, with trajectories favoring lake enhancement Wed into
wed night, especially along and north of i-80. Minor snow
accumulations will also be possible along the ridges and higher
elevations. Little to no snow is expected across the SRN zones.

Dry, cold arctic air arrives Wed night as high pressure begins
to build in from the west. Temperatures Thu morning will be the
coldest yet this season, with much of the area dropping into
the teens.

Cold air advection will keep thanksgiving afternoon temperature
near record-low maxima, even with diurnal heating under a mostly-
clear sky (see climate section below for specifics). Maxima will
struggle to reach 30f for all but the far-swrn portion of the area,
and locations N E of pittsburgh will struggle to exceed the low-mid
20s.

Long term Friday through Tuesday
Sfc high pressure and an upper ridge begin to shift ewd on fri.

Upper ridging will support closer-to-seasonal temperature in
the 40s Fri afternoon amid increasing warm advection,
especially for the swrn half of the forecast area.

Precipitation will develop late Fri night as warm advection
strengthens. Given the cold air preceding its onset, there is a
chance for a brief wintry mix of snow, sleet or freezing rain
before the warm air dominates, bumps the temperature up to the
upper 40s and changes all precipitation to liquid rain by mid-
day sat.

Aviation 18z Tuesday through Sunday
Widespread MVFR ifr conditions will slowly improve through the
afternoon and evening due to incoming drier air and mixing of
low-level moisture. The sfc cold front is currently moving
southeast through the area and producing some gustier wind and
a band of light snow. After its passage, snow showers will
generally end, though isolated showers will remain possible
especially north of i-80.

Outlook...

a more potent cold front will bring additional restrictions with
scattered snow showers Wednesday into Thursday morning.

Climate
With arctic air invading for thanksgiving, currently we are not
forecasting any record low maximum temperatures for november
22nd. The record for pittsburgh is 23, set in 1880. This turkey
day is shaping up to be the coldest thanksgiving day since 2013
(nov 28), when the mercury only reached 28 degrees at
pittsburgh.

Other record low maxima are listed below for 11 22:
morgantown: 26 set in 1880
new philadelphia: 25 set in 1964
wheeling: 27 set in 2000 and 2008
zanesville: 28 set in 1929

Pbz watches warnings advisories
Md... None.

Oh... None.

Pa... None.

Wv... None.

Update... Kramar


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pittsburgh - Allegheny County Airport, PA5 mi26 minW 9 G 169.00 miOvercast34°F30°F85%1019.4 hPa
Pittsburgh, Pittsburgh International Airport, PA16 mi28 minW 129.00 miLight Snow34°F30°F85%1020.1 hPa

Wind History from AGC (wind in knots)
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Last 24hrE3CalmCalmCalmCalmCalmCalmNW3NW3NW6NW6NW7NW6NW6NW3W6W10NW4W9W8W4W11
G18
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1 day agoNW3N4N5N3N5N6N6N4CalmCalmCalmCalmN4CalmN4N3N4N4NE4CalmNE4E3CalmE5
2 days agoW54W5SW3SW3SW4CalmCalmCalmNE3NE33NE3E4NE3NE3E4E4E3SE3S7S8W63

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    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Pittsburgh, PA (14,3,4,5)
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Ground Weather Radar Station Pittsburgh, PA
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Disclaimer:
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 L-36.com. 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 L-36.com 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.