Monday, January18, 2021
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Marine Weather and Tides
Thornburg, 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 7:37AMSunset 5:23PM Monday January 18, 2021 8:40 PM EST (01:40 UTC) Moonrise 11:02AMMoonset 11:11PM Illumination 31% Phase: Waxing Crescent; Moon at 6 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 182312 AFDPBZ

Area Forecast Discussion National Weather Service Pittsburgh PA 612 PM EST Mon Jan 18 2021

SYNOPSIS. Fluctuating temperature with periodic snow showers is expected for most of the week.

NEAR TERM /THROUGH TUESDAY/. Shortwave ripples in quasi-zonal flow aloft wl maintain snow flurry and snow shower potential through the night. Better ascent/snow enhancement is projected on Tuesday morning with the development of an E-W oriented jet to the south of the immediate area. Problematic totals are not anticipated, but an inch or two is possible in any areas that see repetitive snow showers.

SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/. The aforementioned shortwave will traverse the region Tuesday morning into early afternoon within developing zonal flow. Enough influence from the upper jet setting up south of the region plus orographic lift due to strengthening westerlies will allow for snow development over northern WV, favoring the higher terrain. Influence will be more limited farther north, keeping snow showers more isolated. All snow will quickly dissipate in the aftn as dry air filters in behind the exiting shortwave. Late day warming may push area temperature near to slightly above seasonal averages when a warm front lifts northward in advance of a deepening shortwave that will drop out of the western Great Lakes.

Snow showers will return late Tuesday into Wednesday with the approach/passage of the western Great Lakes shortwave and its associated cold front. A combination of strong upper dynamics, plenty of moisture, cold advection plus transition to NW flow (allowing for lake enhancement) will allow for more notable accumulations, favoring the eastern ridges. The cold intrusion will also drop area temperature well below seasonal averages, with most sites struggling to reach 30 degrees.

Increasing subsidence and building sfc high pressure will slowly turn off the lake enhanced snow showers Wednesday afternoon, with dry conditions developing by the night with the potential for some breaks in the clouds as they thin southwest to northeast.

LONG TERM /THURSDAY THROUGH MONDAY/. A low pressure system is expected to move from central Canada to the northern Great Lakes Thursday, with warm SW flow developing over the upper OH River Valley. Above seasonal average temperature is expected, but will be short-lived, with the cold front dropping southeast through the region Thursday aftn. Moisture and forcing will be limited and better located farther north, meaning only isolated snow to rain/snow mix showers are expected along the advancing boundary.

Additional precipitation chances may develop Friday as cold NW flow develops in the wake of the eastward exiting low and upper trough. Otherwise, cold advection will once again drop area temperature well below seasonal averages.

Upper ridging and sfc high pressure will promote dry but cool weather through the weekend. Widespread precipitation is likely to return early next week as low pressure moves out of the Colorado Front Range.

AVIATION /23Z MONDAY THROUGH SATURDAY/. MVFR cigs should prevail through at least the first half of the period as continued shortwave supported snow showers trek along the base of a broad Great Lakes trough. Brief shortwave ridging should then promote the return to VFR / end of show showers toward the end of the TAF period for some ports; though a low-VFR cig deck should prevail under a weak inversion.

Outlook. Occasional restrictions will continue late Tuesday through early Wednesday under broad upper troughing. Brief high pressure should return VFR later Wednesday before being interrupted once more by an encroaching trough on Thursday.

PBZ WATCHES/WARNINGS/ADVISORIES. PA . None. OH . None. WV . None.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pittsburgh, Pittsburgh International Airport, PA9 mi50 minWSW 76.00 miLight Snow30°F24°F79%1017.3 hPa
Pittsburgh - Allegheny County Airport, PA10 mi48 minWSW 14 G 232.50 miLight Snow30°F25°F82%1016.8 hPa

Link to 5 minute data for KPIT

Wind History from PIT (wind in knots)
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Last 24hrSW5SW6W4SW7SW7W7SW6SW7W6W9W11W9W7W5W9W10W12
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1 day agoSW7W6W7SW8W7SW8SW5SW7W6SW5W6W6W8
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2 days agoS3S4CalmCalmCalmCalmCalmCalmCalmSE3CalmS3S3CalmCalmCalmW7W5W4W6W7W6SW4SW6

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

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Ground Weather Radar Station




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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 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.