Monday, November30, 2020
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Marine Weather and Tides
Murrysville, PA

Version 3.4
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8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:20AMSunset 4:54PM Monday November 30, 2020 9:18 PM EST (02:18 UTC) Moonrise 5:13PMMoonset 7:30AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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 Murrysville , PA
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location: 40.45, -79.68     debug


Area Discussion for - Pittsburgh, PA
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FXUS61 KPBZ 010212 AFDPBZ

Area Forecast Discussion National Weather Service Pittsburgh PA 912 PM EST Mon Nov 30 2020

SYNOPSIS. A strong low pressure system will bring rain transitioning to accumulating snow tonight into early Wednesday morning. Dry weather returns Wednesday afternoon and Thursday under building high pressure.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. Low clouds and light rain/drizzle continue across much of the area as low pressure tracks across NY. Deep layer moisture aloft has decreased in a with a dry slot ahead of an approaching upper low, as seen on water vapor satellite and the 00Z PIT sounding. The rain has already changed to snow across portions of Ohio, and this trend should continue from W-E across the remainder of the area as cold advection occurs. Timed this changeover in the forecast using 850 mb temps and critical thicknesses.

Increasing deep layer moisture and lift should result in more widespread snow developing overnight as the upper low moves over the Upper Ohio Valley region. Snow accumulation by morning should range from 2 to 4 inches across much of Ohio, with lesser amounts to the east where a later transition to snow, and a later return to more widespread precip is expected. Maintained all Winter Weather Advisories and Winter Storm Warnings as previously issued. Made no other significant changes to the forecast for the late evening update.

SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/. Upper trough will then remain situated over the eastern Great Lakes through the first half of Wednesday, maintaining snow, with some lake enhancement/upslope for the areas in the Winter Storm Warning. Winter weather advisories will be maintained for all other areas for a general 3 to 5 inches of snow.

Based on Hi-Res model soundings, some of the best snowfall rates will likely occur early afternoon through evening rush hour Tuesday as a surge of colder air (850mb near -9C) deepens the depth of the dendritic growth zone (about 10kft).

Snow showers will begin to diminish into the day on Wednesday as high pressure begins to build.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/. Brief high pressure should promote dry conditions on Thursday before precipitation chances increase once again on the van of yet another, deepening Mississippi Valley low. This should increase precipitation chances from south to north across the region on Friday. The Friday evening and Friday night period hints at another Lake Effect scenario with northwest flow setting up. High pressure once again then follows this setup with dry conditions to end the extended forecast period.

AVIATION /02Z TUESDAY THROUGH SATURDAY/. Rain has transitioned to snow across most of eastern Ohio this evening, and will continue to transition across PA and WV through the early overnight. Dry-slotting is providing a brief lull in rainfall or only -DZ for several eastern sites at TAF issuance time, but these should quickly fill back in over the next couple of hours. Snow should be fairly persistent through the remainder of the period.

MVFR/IFR conditions are likely through much of the period given a saturated sfc and boundary layer plus eventual cold advection. Cigs will improve slightly Tuesday amid increased mixing (which will lead to gustier aftn wind), but areawide snow should keep visibilities low.

Outlook. Restrictions will slowly improve Tuesday night into Wednesday as the low pressure system lifts into eastern Canada, with high pressure building in its wake.

PBZ WATCHES/WARNINGS/ADVISORIES. PA . Winter Weather Advisory from 1 AM Tuesday to 7 AM EST Wednesday for PAZ009-013>016-020>023-029-031-073-075. Winter Storm Warning from 1 AM Tuesday to 7 AM EST Wednesday for PAZ007-008-074-076. OH . Winter Weather Advisory until 7 AM EST Wednesday for OHZ039>041- 048>050-057>059-068-069. WV . Winter Weather Advisory from 1 AM Tuesday to 7 AM EST Wednesday for WVZ001>004-012-021-509. Winter Storm Warning from 1 AM Tuesday to 7 AM EST Wednesday for WVZ510>514.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pittsburgh - Allegheny County Airport, PA15 mi25 minW 85.00 miFog/Mist37°F36°F96%1000.5 hPa
Latrobe / Westmoreland, PA19 mi31 minWSW 10 G 154.00 miLight Rain37°F37°F100%999.7 hPa

Link to 5 minute data for KAGC

Wind History from AGC (wind in knots)
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Last 24hrSE5SE5SE5S4SE4E3E6NE3E5NE553N5N5NW4NW7W7
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1 day agoSW6S6S7S7S7S6S3S6S8S7S7S9S8S5S6S4--S5S4E3CalmE4E4SE3
2 days agoW5SW4S5SW6SW6SW5SW4W5W6W7W7W7W6
G15
W6NW744NW7W5W8SW5SW6SW6W6

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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

Other links: Northern Pacific     Contential US     Full GOES-East
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 numerous 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.