Wednesday, June20, 2018 L-36.com


Marine Weather and Tides
Mercersburg, PA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:41AMSunset 8:43PM Wednesday June 20, 2018 8:55 PM EDT (00:55 UTC) Moonrise 12:24PMMoonset 12:26AM Illumination 51% Phase: First Quarter Moon; Moon at 8 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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ANZ538 Patapsco River Including Baltimore Harbor- 732 Pm Edt Wed Jun 20 2018
Tonight..SW winds 5 kt. Waves flat. Showers likely with a chance of tstms this evening, then showers likely with a slight chance of tstms after midnight. Patchy fog after midnight with vsby 1 to 3 nm.
Thu..N winds 5 kt. Waves less than 1 ft.
Thu night..E winds around 5 kt. Waves 1 ft.
Fri..E winds 5 to 10 kt. Waves 1 ft. Showers likely.
Fri night..E winds 5 to 10 kt. Waves 1 ft. Showers likely.
Sat..S winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.
Sat night..SW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers.
Sun..W winds 5 to 10 kt. Waves 1 ft. A chance of tstms. A chance of showers.
Mon..N winds 5 to 10 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 732 Pm Edt Wed Jun 20 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will track from west virginia east over the waters along a stalled front through tonight. The front will then drop farther south Thursday as high pressure briefly builds from the ohio valley to new england. The front will then return north as a warm front Friday night into Saturday as the high moves offshore and low pressure moves from the midwest to the great lakes. A small craft advisory may be needed for a portion of the waters Friday into Saturday.

7 Day Forecast for Marine Location Near Mercersburg , PA
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location: 39.79, -77.93     debug


Area Discussion for - State College, PA
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Fxus61 kctp 210004
afdctp
area forecast discussion
national weather service state college pa
804 pm edt Wed jun 20 2018

Synopsis
A wavy front over the area will settle just south of the state
tonight. After a dry and pleasant Thursday, rounds of showers
and thunderstorms will return Friday into the weekend as warm
air moves back up into the area.

Near term until 7 am Thursday morning
Rain has tapered off for the moment over the laurels, but
additional storms over pit are headed right for them. Will
continue to run the ffa and hold the flw and fls until after
midnight. Central somerset county has had 3-5 inches of rain
with lots of flooding reports. The flooding is not as noticeable
over southern somerset county for the time being, but with the
additional tsra incoming very shortly, that may change. Cams
keep some precip over these locations until 10z.

Scattered showers continue over the rest of the area even up
into the far north. Must allow for these for the next few hours.

Clouds and high dewpoints will keep temps up quite a bit through
the night. Dewpoints may lower slightly in the north and skies
will show some breaks in the clouds as wind becomes slightly
northerly. Temp forecast toughest there, where the amount of
both clearing and drying is in question. Will hold onto current
numbers for the time being. If a trend is evident there later,
adjustments may be necessary.

Short term 7 am Thursday morning through 6 pm Thursday
Wavy frontal boundary should sink far enough south to bring
fair and pleasant conditions on Thursday. The morning will be
cloudy with areas of fog central and south, but a nice afternoon
is on tap with lower humidity and increasing sunshine. Highs
will range from the low to mid 40s north to the lower 80s south.

Long term Thursday night through Wednesday
Frontal system returns Friday with increase in shower and
thunderstorm activity. This will lead to a trough over the area
for the weekend and pops in the forecast. Heights rise early
next week and a much more summerlike weather pattern is expected
by the middle of next week and later.

Aviation 00z Thursday through Monday
Warm front and wave of low pressure moving from the ohio valley
east along the mason-dixon line will produce widespread MVFR
through this afternoon, with areas of ifr CIGS in rain of
varying intensity along with scattered thunderstorms. Showers
diminish through Wed night, but restrictions will remain in
place into early thu.

Outlook
Thu... Early am rain cig and vsby reductions possible - mainly
across the SE half of pa.

Fri... Pm showers cig reductions possible central mountains.

Sat-sun... Am showers cig reductions possible. Sct pm tsra
impacts possible.

Mon... Fair.

Climate
Astronomical summer begins Thursday, june 21st at 607 am.

Ctp watches warnings advisories
Flash flood watch until 10 pm edt this evening for paz033>036.

Synopsis... Dangelo
near term... Dangelo
short term... Devoir steinbugl
long term... Ross steinbugl
aviation... Devoir gartner rxr
climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 80 mi38 min W 4.1 G 4.1 78°F 78°F1008.2 hPa
WASD2 - 8594900 - Washington, DC 80 mi38 min NNW 7 G 11 78°F 78°F1009.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 84 mi38 min SW 1.9 G 2.9 77°F 1008.4 hPa

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD12 mi63 minS 53.00 miLight Rain Fog/Mist71°F69°F94%1009.3 hPa

Wind History from HGR (wind in knots)
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Last 24hrE4E4E3CalmCalmCalmN3N3N3NW5NW53CalmCalmW3W6S8CalmS3E4CalmN5NW7S5
1 day agoSW4SW4SW4S4S5S5CalmN11N3CalmCalmSW3W5NW8NW12N11N11NE8N11N6NE8NE5N8NE5
2 days agoS5S4S4SW3CalmSE3E6SE4S4S5S3S4SW6S654S6W7SE9S5S6W7SW7SW5

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
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Wed -- 01:22 AM EDT     Moonset
Wed -- 02:45 AM EDT     3.27 feet High Tide
Wed -- 05:43 AM EDT     Sunrise
Wed -- 06:52 AM EDT     First Quarter
Wed -- 09:30 AM EDT     0.29 feet Low Tide
Wed -- 01:21 PM EDT     Moonrise
Wed -- 03:06 PM EDT     3.19 feet High Tide
Wed -- 08:37 PM EDT     Sunset
Wed -- 09:55 PM EDT     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
22.73.23.332.41.81.20.70.30.30.91.72.533.232.51.91.30.70.30.10.4

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Wed -- 01:22 AM EDT     Moonset
Wed -- 02:49 AM EDT     3.26 feet High Tide
Wed -- 05:43 AM EDT     Sunrise
Wed -- 06:52 AM EDT     First Quarter
Wed -- 09:33 AM EDT     0.26 feet Low Tide
Wed -- 01:21 PM EDT     Moonrise
Wed -- 03:10 PM EDT     3.17 feet High Tide
Wed -- 08:37 PM EDT     Sunset
Wed -- 09:58 PM EDT     0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
22.73.13.232.41.81.20.70.30.30.81.72.433.232.61.91.30.80.30.10.4

Weather Map and Satellite Images
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wmap_A
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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for State College, PA (20,4,5,8)
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Ground Weather Radar Station Sterling, VA
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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.