Monday, August19, 2019 L-36.com


Marine Weather and Tides
Thornburg, PA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:33AMSunset 8:13PM Monday August 19, 2019 4:22 PM EDT (20:22 UTC) Moonrise 9:32PMMoonset 9:15AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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 Thornburg , PA
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location: 40.44, -80.08     debug


Area Discussion for - Pittsburgh, PA
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Fxus61 kpbz 191921
afdpbz
area forecast discussion
national weather service pittsburgh pa
321 pm edt Mon aug 19 2019

Synopsis
Warmth, humidity, and daily thunderstorm chances will continue
through midweek. Relatively cooler temperature can be expected to end
the week.

Near term until 6 am Tuesday morning
Weak nwly flow around the NRN periphery of sfc high pressure has
generated lake-enhanced CU roughly north of a line from ucp-idi,
owing to steep low-level lapse rates and modest moisture enhancement
from the cross-lake flow.

Deeper CU also are beginning to appear from near hlg-mgw in the
higher-dewpoint air spreading slowly ewd with time. Between these
two regions, relatively drier air is limiting cloud development
despite strong heating.

Any potential for convective initiation will come from focused
convergence that is not readily apparent in sfc analysis. Such
regions could materialize in ERN oh, the i-80 corridor or the ridges,
the result of weak upslope flow. If convection initiates, it will
remain isolated and will subside quickly after sunset with loss of
heating. Initiation is conditional, however, and warrants low pops.

As the sfc high shifts ewd and abundant moisture continues its ewd
spread, fog appears likely to form tonight, especially in the river
valleys. Any fog will burn off in the morning.

Short term 6 am Tuesday morning through Thursday night
Zonal flow around the periphery of a south-central CONUS ridge will
direct a low-amplitude shortwave trough through the upper oh valley
on tue. The atmosphere will become increasingly primed for
thunderstorms on tue, with near-70f dewpoint air, strong heating into
the upper 80s and steepening lapse rates yielding moderate to strong
instability by Tue afternoon.

Although shear is a limiting factor for updraft organization, the
primary expected threat on Tue afternoon will be from damaging
downburst wind and perhaps hail. Thunderstorms are expected to
develop by mid-afternoon.

Farther west, a MCS is forecasted to advance through the midwest
during the afternoon. There is model uncertainty as to the eventual
track of the system, with some model output suggesting it maintains a
nly track while others (the more likely outcome given the instability
axis) suggest it develops a sely movement with time.

Instability remains on wed, but lapse rates potentially weaken
(either from being worked over by Tue storms or from advection of
warmer air aloft). So although thunderstorms can be expected ahead of
a swd-advancing cold front, potential for strong updrafts is
correspondingly diminished by Wed afternoon.

A cold front advances through the region on Thu morning, and rain
chances shift sewd with the boundary. As high pressure builds in
behind the front, and dry air erodes any low-level moisture, a
seasonal end to the week is anticipated.

Long term Friday through Monday
Surface high pressure building under upper-level troughing in the
nern CONUS should return dry, cooler and less-humid weather to end
the week.

Aviation 19z Monday through Saturday
Diurnal heating will yield a growing CU field this aftn, becoming
sct bkn for most places. A weak cap between 850mb and 700mb and a
lack of a lifting mechanism will limit storm generation, though an
isolated TSTM can't be ruled out this aftn eve. The best chances
will be mainly north of i-80 where more extensive CU growth is
occurring. With isold sct showers tstms developing mainly north of
i-80.

Some hi-res models hint at storm generation overnight from kzzv to
kmgw in association with a weak sfc trough, but a fairly stable
environment and lack of model consensus leaves confidence too low for
mention of this feature.

The lack of moisture evacuation plus enough clearing of clouds will
combine with light winds for patchy fog developing through
radiational cooling Tuesday morning. Confidence highest for valley
areas around and north of kpit where cloud coverage is expected to be
thinnest.

Outlook
With a number of disturbances passing through the region, periods of
flight restrictions due to tstms and patchy morning fog are likely
through Friday morning.

Pbz watches warnings advisories
Md... None.

Oh... None.

Pa... None.

Wv... None.

Kramar


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pittsburgh, Pittsburgh International Airport, PA9 mi31 minVar 510.00 miA Few Clouds86°F62°F45%1017.4 hPa
Pittsburgh - Allegheny County Airport, PA10 mi29 minVar 610.00 miFair86°F64°F49%1017.1 hPa

Link to 5 minute data for KPIT

Wind History from PIT (wind in knots)
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Last 24hr6SW8SW8S5SE6S5S5S4S4CalmNW19
G33
N5S45NW5W3W3SW7N4NW54SW7W65
1 day agoSW9W4SW10S3CalmS3CalmCalmS3CalmCalmCalmS3CalmS3SE3SE6S5SW9SW9W9S8SW11
G17
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2 days agoW8W8W5W4W3CalmCalmCalmCalmCalmS3CalmCalmSE3CalmS4S3S6SW6SW11
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SW10SW9SW9

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 (16,3,4,5)
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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.