Friday, March22, 2019 L-36.com


Marine Weather and Tides
Mercersburg, PA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:09AMSunset 7:25PM Friday March 22, 2019 8:47 AM EDT (12:47 UTC) Moonrise 8:30PMMoonset 7:27AM Illumination 98% 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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ANZ538 Patapsco River Including Baltimore Harbor- 737 Am Edt Fri Mar 22 2019
.gale warning in effect through late tonight...
Today..NW winds 25 kt with gusts to 40 kt. Waves 3 ft. Isolated showers this morning, then numerous showers with isolated tstms this afternoon.
Tonight..NW winds 20 to 25 kt with gusts to 40 kt. Waves 3 ft.
Sat..NW winds 15 to 20 kt with gusts to 30 kt. Waves 2 ft.
Sat night..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Sun..W winds 5 kt. Waves less than 1 ft.
Sun night..SW winds 5 kt. Waves less than 1 ft.
Mon..N winds 5 to 10 kt. Waves 1 ft or less. Showers likely .
Tue..NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 737 Am Edt Fri Mar 22 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will strengthen as it moves toward the canadian maritimes through tonight. High pressure will return for the weekend before low pressure and its associated cold front impact the waters early next week. The gale warning may be need to be continued into Saturday morning, but otherwise a small craft advisory will likely be needed Saturday into Saturday night. Small craft advisories may also be needed Monday into Tuesday.


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 221024
afdctp
area forecast discussion
national weather service state college pa
624 am edt Fri mar 22 2019

Synopsis
Windy and colder conditions with rain showers, snow showers, and
locally heavier squalls will follow behind a strong coastal
storm that brought heavy rain to the lower susquehanna valley.

Improving weather is expected over the weekend with moderating
temperatures. The next weather system is expected into early
next week.

Near term through tonight
Rain and high elevation snow will end across the far eastern
part of the CWA early this morning. Small streams in the
juniata and lower main stem susquehanna river basins have
responded to the rainfall with several points cresting above
caution stage.

Focus shifts to changing weather expected over the next 24
hours. A strong shortwave will combine with strong march Sun and
cold air aloft to produce gusty winds and convective rain snow
showers. Locally heavier squalls (possibly containing small hail
or graupel) are possible and could be accompanied by rumbles of
thunder. Issued wind advisory for part of south central pa
where fcst soundings and hires guidance indicates potential for
max winds gusts around 50 mph. The most likely timing for max
gusts would be later this afternoon into early tonight as
subsidence region moves over the area in the wake of the
vigorous shortwave. Frequent snow showers will likely bring a
light snow accumulation and areas of slippery travel to the
higher elevations of the western alleghenies through tonight.

Short term Saturday through Sunday night
Snow showers should end early Saturday morning followed by
gradually subsiding winds into Saturday night. High pressure
will provide dry wx over the weekend with temperatures trending
warmer on Sunday. Models are in decent agreement with the next
system returning light precipitation to the area late Sunday
night into Monday.

Long term Monday through Thursday
There is growing confidence in a period of light precipitation
on Monday. Dry weather is fcst from Monday night through late
week. Temperatures should trend colder early next week before
rebounding above average toward the end of the month.

Aviation 10z Friday through Tuesday
Rain associated with coastal storm is exiting the eastern part
of the forecast area at 1030z. CIGS have been rising across most
of the region early this morning, as a gusty northwest wind
pulls drier air in. Latest model soundings supportVFR
conditions across the eastern half of the forecast area by 12z.

Further west, upsloping flow will likely yield persistent low-end
MVFR CIGS this morning over the high terrain from kbfd to kjst.

A potent cold front will dive southeast across the region late
today, accompanied by snow squalls across the high terrain of
northern and western pa and rain showers with possible thunder
across the southeast half of the state. A few dips to ifr lifr
vsbys appear likely at kbfd kjst and possible at kunv kaoo this
afternoon. Further east, temperatures should be too warm for
snow, so the threat of significant vsby reductions are low.

Behind the front, strong gusty northwest winds will be the main
issue late today and this evening. Bufkit soundings support
gusts to around 40kts during this time.

Outlook
Sat... Still gusty northwest winds.

Sun... No sig wx expected.

Mon... Rain snow low CIGS possible, mainly N and W mtns.

Tue... No sig wx expected.

Hydrology
Camp hill yellow breeches responded quickly and will crest
over fs around 8ft early this morning. We are monitoring a few
other lower main stem tribs with harper tavern swatara creek
approaching minor fs. Expect falling stages by later today.

Ctp watches warnings advisories
Flood watch until 8 am edt this morning for paz036-057>059-
063>066.

Wind advisory from 1 pm this afternoon to 5 am edt Saturday
for paz024>028-033>036-056-063-064.

Synopsis... Steinbugl
near term... Steinbugl
short term... Steinbugl
long term... La corte
aviation... Fitzgerald
hydrology...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 80 mi36 min NNW 13 G 21 46°F 47°F1000.7 hPa
WASD2 - 8594900 - Washington, DC 80 mi30 min WNW 16 G 28 46°F 49°F1003.2 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 84 mi30 min WNW 23 G 30 46°F 1000.4 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD12 mi55 minNW 20 G 2710.00 miOvercast and Breezy42°F30°F62%1004.6 hPa

Wind History from HGR (wind in knots)
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Last 24hrN4NW4N8N7N7N8N11N10N8NW10NW11NW10--NW17NW15NW10N9NW10NW13NW15NW17
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S13S11S11S13S12S7SE7SE4SE7SE5SE10SE7CalmCalmW3CalmNE3NE4N4E7
2 days agoSW3W3CalmN5S54Calm3CalmCalmS3SE5SE5SE4SE5CalmCalmCalmE3E5E5E5SE4Calm

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 04:49 AM EDT     -0.23 feet Low Tide
Fri -- 07:09 AM EDT     Sunrise
Fri -- 08:24 AM EDT     Moonset
Fri -- 10:25 AM EDT     3.59 feet High Tide
Fri -- 05:21 PM EDT     -0.33 feet Low Tide
Fri -- 07:22 PM EDT     Sunset
Fri -- 09:26 PM EDT     Moonrise
Fri -- 10:55 PM EDT     3.37 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.51.81.10.4-0-0.20.21.22.33.13.53.532.21.40.70.1-0.3-0.20.51.62.53.23.4

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Fri -- 04:44 AM EDT     -0.23 feet Low Tide
Fri -- 07:09 AM EDT     Sunrise
Fri -- 08:24 AM EDT     Moonset
Fri -- 10:20 AM EDT     3.59 feet High Tide
Fri -- 05:16 PM EDT     -0.33 feet Low Tide
Fri -- 07:22 PM EDT     Sunset
Fri -- 09:26 PM EDT     Moonrise
Fri -- 10:50 PM EDT     3.37 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.51.710.4-0.1-0.20.31.32.43.23.63.52.92.21.40.70.1-0.3-0.20.61.72.63.23.4

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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Wind Forecast for State College, PA (8,2,3,4)
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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.