Thursday, August6, 2020
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Marine Weather and Tides
Timber Hills, PA

Version 3.4
NOTICE
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 6:07AMSunset 8:15PM Thursday August 6, 2020 9:40 PM EDT (01:40 UTC) Moonrise 9:14PMMoonset 7:54AM Illumination 90% Phase: Waning Gibbous; Moon at 18 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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ANZ530 Chesapeake Bay North Of Pooles Island- 738 Pm Edt Thu Aug 6 2020
Tonight..E winds 5 to 10 kt. Waves 1 ft or less. Numerous showers and scattered tstms this evening, then scattered showers with isolated tstms after midnight with vsby 1 to 3 nm.
Fri..E winds 5 kt. Waves flat. Showers likely with a chance of tstms. Patchy fog. Vsby 1 to 3 nm.
Fri night..NE winds 5 kt. Waves flat. Showers likely with a chance of tstms.
Sat..N winds 5 kt. Waves flat. A chance of showers.
Sat night..S winds around 5 kt. Waves flat.
Sun..SW winds around 5 kt. Waves flat.
Sun night..S winds 5 to 10 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft.
Tue..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 738 Pm Edt Thu Aug 6 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A stationary boundary will linger near the region and our marine areas through Friday. This will result in chances for showers and Thunderstorms each day during the late afternoon and evening.


7 Day Forecast for Marine Location Near Timber Hills, PA
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location: 40.24, -76.51     debug


Area Discussion for - State College, PA
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FXUS61 KCTP 062353 AFDCTP

Area Forecast Discussion National Weather Service State College PA 753 PM EDT Thu Aug 6 2020

SYNOPSIS. A ridge of high pressure will hold to our north into Friday, while a stationary front will be located south of the Mason- Dixon line. A few weak waves of surface low pressure developing over the Central Appalachians and Delmarva region today and Friday will bring scattered to numerous showers and thunderstorms. For the weekend, plenty of sunshine and dry weather will precede the arrival of warmer, more humid air and daily thunderstorm chances during the first part of next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. Isold heavy rain has lifted north of the PA/MD border in southeast Adams County producing heavy downpours and frequent lightning. Some minor flooding is likely to accompany it over the next 60-90 minutes. So far the areas hit hardest by Isaias's rains have seen little. Still holding onto the Flash Flood Watch for those three southeast counties this evening, as weak shear and slow storm motions in rich moisture environment will need to be watched.

High pressure supplying a mainly dry time for our NW few counties, but all other locations have at least mentionable PoPs, and likely to cat PoPs warranted over the SE half of the area.

Mins tonight will be a function of where and how much rain falls and the residual cloud cover. Much of the area could lose the lower clouds after this initial wave pushes through, but the long-wave trough moving in and light/easterly wind to the north of the boundary to our south could allow a widespread low deck. Will hold with current mins as they reflect the possibility of the low clouds.

SHORT TERM /6 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/. Showers should be mainly off to thew east of the area at sunrise, but the long-wave trough will be over the PA/OH border then. The trough does not move very far through the day. The clouds will try to break up/lift in the morning, but may not do very well. Still, the sfc high will be a little more to the NE than Thurs and more Atlantic moisture will be building in. PWATs rise slightly overall. SHRA/TSRA will be numerous over the eastern half or so of the CWA on Fri, but the srn third will still be most likely to get wet. Excessive rainfall is less likely than Thurs with higher stability on the whole. But, we will continue to assess the need for another/subsequent FFA, especially if continues to look like the SE/wettest area will again get the tallest storms Fri.

LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/. By 00z Sat, models prog the trough axis to be over central PA, with linger showers/tstms over mainly eastern PA. Heights will rise on Saturday behind the departing trough, with increasing sunshine through the day and just a slight chance of a stray shower Saturday afternoon. Sunday will also be sunny with high pressure overhead. Temps this weekend will be a few degrees above normal, with highs in the 80s, and dewpoints in the upper 50s and 60s.

The longer term will feature a return of warmer weather, with temperatures generally 5-10 degrees above average from Mon through Wed as an upper ridge builds over the Eastern US. Dewpoints climb back to the upper 60s and 70s for Tue and Wed, and perhaps even the mid 70s in the Lower Susq. Combined with temps in the upper 80s to near 90, this would mean Heat Index values take a run at the upper 90s to near 100 in the Lower Susq, so long as the low level moisture doesn't mix out in the afternoon and cause the dewpoint to drop. We did knock afternoon dewpoints down from NBM guidance across central and northwestern zones Mon and Wed afternoon, where it looks like drier air will mix down.

Isolated airmass thunderstorms are possible Mon afternoon, although weak forcing and perhaps some capping should limit coverage. With the increase in humidity and approach of a weak cold front Tue-Wed, showers/tstms will likely become more numerous.

AVIATION /00Z FRIDAY THROUGH TUESDAY/. Best chance for TS will be at MDT and LNS this evening, with scattered showers possible at all but JST and AOO before midnight. As the atmos stratifies and light/east wind continues, low clouds become possible for most locations, esp the mtns. Have brought many sites into IFR cigs and/or vsby since the llvl humidity should rise along with the cloud cover overnight.

Cigs will be slow to recover on Friday with visibility improving in the morning. Scattered showers and thunderstorms appear likely to redevelop by afternoon with short-duration cig/vis reductions expected.

Outlook .

Sat-Mon . VFR. AM fog poss nrn valleys. Tue . Front approaching fm W. PM TSRA, mainly W.

CTP WATCHES/WARNINGS/ADVISORIES. Flash Flood Watch until 6 AM EDT Friday for PAZ036-064>066.

SYNOPSIS . Dangelo NEAR TERM . DeVoir/Dangelo SHORT TERM . Dangelo LONG TERM . Colbert AVIATION . Dangelo/Banghoff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 62 mi53 min 84°F
MRCP1 - 8540433 - Marcus Hook, PA 65 mi53 min 81°F
BLTM2 - 8574680 - Baltimore, MD 67 mi53 min 78°F 82°F1018 hPa

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muir Army Air Field / Indiantown, PA14 mi45 minVar 210.00 miOvercast74°F66°F78%1019 hPa
Lancaster, Lancaster Airport, PA14 mi48 minSE 410.00 miPartly Cloudy75°F68°F79%1018.7 hPa
Harrisburg, Harrisburg International Airport, PA14 mi45 minS 76.00 miThunderstorm Rain76°F70°F82%1018.2 hPa
Harrisburg, Capital City Airport, PA18 mi45 minWSW 31.50 miHeavy Rain74°F69°F85%1018.5 hPa

Link to 5 minute data for KLNS

Wind History from LNS (wind in knots)
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Last 24hrCalmNE3SE3CalmCalmCalmE3CalmCalmCalmE4NE8E7NE8NE5E6E4E7E6E6SE6E5E4SE4
1 day agoW4NW3CalmW5CalmCalmNW4W4SW3W3NW4NW7NW63W6W6W9NW7W10
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2 days agoE3SE4S3E4E4E3CalmCalmNE6NE6NE10N9N13
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Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Thu -- 01:00 AM EDT     2.69 feet High Tide
Thu -- 06:08 AM EDT     Sunrise
Thu -- 07:54 AM EDT     0.95 feet Low Tide
Thu -- 08:53 AM EDT     Moonset
Thu -- 01:23 PM EDT     3.41 feet High Tide
Thu -- 08:11 PM EDT     Sunset
Thu -- 09:10 PM EDT     1.03 feet Low Tide
Thu -- 10:11 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.52.72.62.31.91.61.2111.11.72.433.43.43.12.82.31.81.41.211.21.6

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland (2)
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Havre de Grace
Click for Map
Thu -- 12:07 AM EDT     2.25 feet High Tide
Thu -- 06:08 AM EDT     Sunrise
Thu -- 06:26 AM EDT     0.79 feet Low Tide
Thu -- 08:53 AM EDT     Moonset
Thu -- 12:30 PM EDT     2.85 feet High Tide
Thu -- 07:42 PM EDT     0.85 feet Low Tide
Thu -- 08:10 PM EDT     Sunset
Thu -- 10:11 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.32.21.91.61.210.80.81.11.522.52.82.82.62.31.91.41.10.90.91.11.41.9

Weather Map
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wmap_A
GEOS 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 State College, PA (21,6,7,8)
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Ground Weather Radar Station Philadelphia, PA
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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.