Friday, June23, 2017 L-36.com


Marine Weather and Tides
West Homestead, PA

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 5:48AMSunset 8:55PM Friday June 23, 2017 1:14 PM EDT (17:14 UTC) Moonrise 4:33AMMoonset 7:25PM 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 West Homestead , PA
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location: 40.4, -79.91     debug


Area Discussion for - Pittsburgh, PA
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Fxus61 kpbz 231525
afdpbz
area forecast discussion
national weather service pittsburgh pa
1125 am edt Fri jun 23 2017

Synopsis
Downpours are possible through tonight with a tropical airmass
in place. A cold front sweeping through early Saturday will
return comfortable humidity levels by the weekend.

Near term until 6 pm this evening
Warm rain process in full effect this morning. One area of rain
is almost through with a break then another round this afternoon.

Our radar is now in a tropical z r relationship. No changes to
the forecast as its in good shape with radar trends. Previous
discussion follows:
rain showers associated with an upper-level shortwave are
moving through eastern oh and southwestern pa. These light to
moderate showers will slide northeast this morning following the
shortwave, bolstered by mid-level speed convergence and upper-
level divergence. This rain will continue to pre-condition much
of the flash flood watch area with a quarter to half an inch of
rain, before the heavier rain chances arrive later today. With
many locations in indiana and armstrong counties still impacted
by yesterday's flash flooding including many road closures, an
areal flood warning will be in effect through tonight.

This morning will feature a break in the widespread rain as the
initial wave moves east. At this point the remnants of t.S.

Cindy will be slowly moving through the lower ohio valley and
the cold front descending through the southern great lakes.

Showers and thunderstorms are expected Friday afternoon evening
everywhere as the converging systems begin to phase near the
local forecast area. Strong ascent will meet a moisture-rich
environment to the tune of 2" or greater pwat values. Increasing
850mb flow into deep warm cloud depths nearing 13kft will be
plenty sufficient to support tropical rain rates... Causing very
heavy rainfall at times. To prepare for this, the local wsr-88d
has been modified to a tropical z r relationship.

High surface dewpoints will continue to fuel modest instability
with sb CAPE values progged in the 1000-1500 j kg range. This,
along with moderate shear through the mid-levels should be
sufficient for thunderstorm development with a few strong to
severe possible. Freezing levels will be lofty, so the primary
threat will remain convective wind damage, but some veering in
the lowest 200mb and relatively low lcls reveals that an
isolated tornado cannot be ruled out. The forecast area is
currently blanketed by a marginal risk from spc, and a small
area of slight risk extending into our southern counties.

Possibility of severe weather would likely expand if more
clearing across our southern counties is achieved.

With very high dewpoints in place and expansive cloud deck
expected, temperatures won't range wildly over the next 24
hours. Highs today will be near or a few degrees below average,
but the muggy conditions will prevail.

Short term 6 pm this evening through Saturday night
Instability will lessen heading into the evening which will
decrease the severe threat, however, another period of moderate
rain still looks likely pittsburgh along and ahead of the
aforementioned cold front and under the right-rear quadrant of
the jet. By Saturday morning precipitation should be east of the
ridges as drier air moves in behind the front. Saturday should
be noticeably more comfortable with highs in the upper 70s and
lower humidity. Benign weather can be expected Saturday night
with high pressure.

Long term Sunday through Thursday
Sfc high pressure will remain largely in control on Sunday,
however, a shortwave passing to the north could result in
scattered precipitation along and north of i-80 during the
afternoon. A stronger shortwave will deepen the eastern conus
longwave trough on Monday... Maintaining slightly below normal
temperatures and return chances of precipitation during the
afternoon through Tuesday morning. Upper ridging will follow...

bringing temperatures back to their normal location and
returning dry weather.

Aviation 15z Friday through Tuesday
Tropical moisture will continue to stream northward ahead of an
approaching cold front this afternoon. Interaction with the
aforementioned front and digging shortwave will support periods
of rain and an increasing chance for thunderstorms through the
afternoon. Confidence in widespread MVFR and brief ifr
visibility restrictions is high for the remainder of the day in
periods of heavy rain, with the expectation that ifr CIGS will
lift over most terminals this afternoon. Some thunderstorms may
be severe, with strengthening shear jet support, which could
result in strong severe gusts at terminals this afternoon.

Restrictions will likely continue tonight as the remnants of
cindy pass along the pa WV border. CIGS may fall back to ifr
after sunset with some fog possible with saturated conditions.

But, improvement is expected by Saturday morning as surface
ridging builds overhead.

Wsw wind will remain gusty through the afternoon and again
tomorrow.

Outlook
Upper trough may bring occasional restrictions Sun and Mon in
afternoon showers storms.

Hydrology
A flash flood watch has been issued for areas along and south
of interstate 70. In addition, allegheny, armstrong and indiana
counties have been included, due to very low flash flood
guidance.

Meteorologically values all point to high water issues with
pwats over two inches, warm cloud depths above 13kft, and a
strong low level jet. GEFS m-climate values are near or at
record levels for pwats on return interval, and climate
anomaly.

Widespread 1.5" to 2.5" through tonight could lead to strong
rises on the monongahela, cheat and ohio rivers and their
tributaries. Slightly less is expected north of the watch area,
but the allegheny basin could still see a widespread 1" to 2".

Pbz watches warnings advisories
Md... Flash flood watch through late tonight for mdz001.

Oh... Flash flood watch through late tonight for ohz057>059-068-069.

Pa... Flash flood watch through late tonight for paz021>023-029-031-
073>076.

Wv... Flash flood watch through late tonight for wvz002>004-012-021-
509>514.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pittsburgh - Allegheny County Airport, PA4 mi22 minSW 1410.00 miLight Rain76°F70°F82%1006 hPa
Pittsburgh, Pittsburgh International Airport, PA18 mi24 minSW 9 G 2110.00 miLight Rain75°F72°F90%1005.8 hPa

Wind History from AGC (wind in knots)
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Last 24hrSW9S10S14SW16
G20
S10S10S6S5S6S8SW8SW11SW12S8S7S6S5S6SW6SW8SW10S10
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1 day agoW12
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NW6NW76NW5NW4NW4W4W3SW6NW4CalmCalmS4S4S4S4S5S5S9S4SW7SW9SW10
2 days agoW9
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SW10SW9S5S6S5S7S6S7S83S4CalmS6CalmW3SW6W8W6
G15
W12
G18

Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Pittsburgh, PA (13,3,4,5)
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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.