Friday, August18, 2017 L-36.com


Marine Weather and Tides
Chambersburg, PA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:24AMSunset 8:03PM Friday August 18, 2017 2:23 PM EDT (18:23 UTC) Moonrise 1:53AMMoonset 4:43PM Illumination 13% Phase: Waning Crescent; Moon at 26 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- 133 Pm Edt Fri Aug 18 2017
.small craft advisory in effect until 1 am edt Saturday...
This afternoon..S winds 10 kt with gusts to 20 kt. Waves 1 ft. Tstms likely with showers. Vsby 1 nm or less.
Tonight..W winds 5 to 10 kt. Gusts up to 20 kt until early morning. Waves 1 ft. Showers with tstms likely. Vsby 1 nm or less.
Sat..W winds 5 kt. Waves less than 1 ft.
Sat night..NW winds around 5 kt. Waves 1 ft or less.
Sun..NW winds around 5 kt. Waves flat.
Sun night..SE winds around 5 kt. Waves flat.
Mon..S winds around 5 kt. Waves flat.
Tue..SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 133 Pm Edt Fri Aug 18 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold will cross the waters tonight. A pressure trough will remain nearby for Saturday and Sunday while high pressure positions itself just to our north and west. The high will move offshore early next week. Small craft advisories may be needed Monday night and Tuesday.

7 Day Forecast for Marine Location Near Chambersburg , PA
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location: 39.93, -77.66     debug


Area Discussion for - State College, PA
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Fxus61 kctp 181504
afdctp
area forecast discussion
national weather service state college pa
1104 am edt Fri aug 18 2017

Synopsis
A cold front will move through the region today. An upper trough
will move across the area on Saturday. Temperatures will stay
above normal but rise even higher each day through Tuesday as a
ridge builds aloft. Another cold front should trigger showers
around mid-week and the week should end on a cooler note.

Near term through tonight
Broken area of rain is now becoming more showery and a line is
forming to the west of jst fig. Instability back in the clear-er
air over the NW is also firing up a sct line of shra which may
produce TS soon. Some pockets of heavy rain are possible as
pwats dewpoints are very high - some of the highest of the
summer in many places. Temps aloft are very warm but the temps
aloft should be cooling slightly this aftn and, as is happening
in the nw, thunder is possible in most places. Timing still
looks very solid with the storms rain pushing out of the SE by
21z, and only a sct shra tsra in the NRN mtns after that but
well before midnight.

Prev...

with the front passing off to the east this evening, the bulk
of the overnight hours will be dry, with the best chance for a
lingering shower after dark being over the far eastern areas.

Cooler and drier air will seep in overnight. Lows will drop back
into the upper 50s to mid 60s.

Short term Saturday
High pressure will nose into the state to start the day with
fair-dry conditions. However a potent shortwave rotating through
the base of the long-wave trough passing overhead will bring a
renewed threat for scattered showers and perhaps thunder back
into the forecast area during the afternoon. The timing is
almost perfectly lined up for daytime heat and the short-wave
trough forcing. Dewpoints should be around 60f by that time.

Saturday's highs will range from the mid 70s north to mid 80s
south which will average a couple of deg either side of normal.

Long term Saturday night through Thursday
After the shortwave moves through the area by later Saturday,
heights aloft are forecast to rise and become quasi-zonal.

Sunday into Tuesday looks warm and dry, with Tuesday even ending
up hot over most of the area. A new shortwave moving through
srn canada will an bring an increasing chance for rain, possibly
as early as Tuesday afternoon over western sections of the
forecast area.

There are differences in timing of the rain with the ecmwf
suggesting it holds off until Tuesday night. Blended MOS pops
show a small chance of showers moving into western sections
Tuesday afternoon, but the highest pops are reserved for the
overnight.

Cyclonic flow aloft will then dominate the flow pattern through
Thursday. The cool air aloft will help trigger a few mainly
diurnal showers Wednesday and Thursday. The showers will tend to
favor northern and western higher elevations. Temperatures will
be significantly cooler for the second half of the week.

Aviation 15z Friday through Tuesday
Almost solid area of showers rain running right thru the central
part of the area from SE to NW is sliding only slowly to the
east. Breaks in the sky cover will allow it to get unstable and
make sct-nmrs tsra this aftn. Reductions to MVFR are likely and
some ifr is possible through early aftn in bfd, and 20z in the
central terminals, and 22z in mdt lns.

A final push of drier air will move through this evening and
early tonight. Thus, a few shra tsra are possible in bfd between
23z and 02z - but the other terminals should stay dry this
evening and tonight. Fog is possible for most of the area
tonight, but more so in the SE where the dry air arrives later.

Lower clouds should form over the NW mtns tonight, but these
should stop around the old aoo-unv-ipt line.

An upper level trough and rather strong forcing passing
directly overhead in the cooler air aloft could make sct
shra tsra across the northern third half of pa on Sat aftn.

Much drier air will make for a mainly-vfr sun-mon with only
valley fog in the am a potential issue.

Outlook
Sun-mon... No sig wx.

Tue... Shra tsra poss.

Ctp watches warnings advisories
None.

Synopsis... Dangelo la corte
near term... Dangelo
short term... La corte
long term... La corte
aviation... Dangelo martin


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 73 mi54 min S 5.1 G 8 85°F 83°F1009.2 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 78 mi54 min ESE 8.9 G 9.9 82°F 1009.7 hPa
WASD2 - 8594900 - Washington, DC 81 mi54 min S 8.9 G 11 86°F 81°F1009.2 hPa

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD16 mi31 minSSW 12 G 216.00 miLight Rain82°F72°F72%1010.2 hPa

Wind History from HGR (wind in knots)
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Last 24hrS7SE10S7S5SE8S8SE9S9S11S8S5S3S3SE4S4S63S9S6S9S7S8S10SW12
G21
1 day agoNW6NW4N6N7NE6NE4E3CalmCalmCalm3NE6E5CalmCalmCalmNW5NW5NW6Calm33W4S6
2 days agoW3NE53CalmCalmCalmCalmCalmCalmSW4CalmSE3S3S4CalmCalmCalmCalmCalmCalmCalmCalmCalmNW3

Tide / Current Tables for Middle Branch, Baltimore Harbor, Maryland
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Middle Branch
Click for Map
Fri -- 02:50 AM EDT     Moonrise
Fri -- 04:33 AM EDT     1.86 feet High Tide
Fri -- 06:22 AM EDT     Sunrise
Fri -- 12:01 PM EDT     0.54 feet Low Tide
Fri -- 04:38 PM EDT     1.17 feet High Tide
Fri -- 05:36 PM EDT     Moonset
Fri -- 07:57 PM EDT     Sunset
Fri -- 10:47 PM EDT     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.611.41.71.81.81.71.51.310.80.60.50.60.811.11.21.10.90.60.40.30.3

Tide / Current Tables for Middle Branch, Baltimore Harbor, Patapsco River, Maryland
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Middle Branch
Click for Map
Fri -- 02:50 AM EDT     Moonrise
Fri -- 04:32 AM EDT     1.86 feet High Tide
Fri -- 06:22 AM EDT     Sunrise
Fri -- 12:01 PM EDT     0.54 feet Low Tide
Fri -- 04:38 PM EDT     1.18 feet High Tide
Fri -- 05:37 PM EDT     Moonset
Fri -- 07:57 PM EDT     Sunset
Fri -- 10:47 PM EDT     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.611.41.71.81.81.71.51.310.80.60.50.60.811.11.21.10.90.60.40.30.3

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for State College, PA (14,3,4,5)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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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.