Tuesday, May23, 2017 L-36.com


Marine Weather and Tides
Chambersburg, PA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:46AMSunset 8:28PM Tuesday May 23, 2017 1:02 AM EDT (05:02 UTC) Moonrise 3:33AMMoonset 4:54PM Illumination 7% Phase: Waning Crescent; Moon at 27 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- 1032 Pm Edt Mon May 22 2017
Rest of tonight..N winds 5 kt. Waves less than 1 ft. A slight chance of showers late this evening. Patchy fog with vsby 1 to 3 nm.
Tue..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Tue night..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Wed..E winds 5 to 10 kt. Waves 1 ft or less.
Wed night..SE winds 5 to 10 kt. Waves 1 ft. Showers.
Thu..S winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms.
Thu night..W winds 5 to 10 kt. Waves 1 ft or less. A chance of showers.
Fri..W winds 10 to 15 kt. Waves 1 ft. A chance of showers in the morning.
Sat..S winds 5 kt. Waves less than 1 ft. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1032 Pm Edt Mon May 22 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the area this evening. High pressure will briefly build in tonight into early Tuesday before a low pressure system moves up near the delmarva coast Tuesday night. Another area of low pressure will move through the area Wednesday night. Small craft advisories may be needed for portions of the waters Wednesday night into Thursday.

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 230356
afdctp
area forecast discussion
national weather service state college pa
1156 pm edt Mon may 22 2017

Synopsis
A cold front will push to the east of central pa this evening.

High pressure then builds in. However, a storm moving up the
east coast and could brush southeastern pa with a little rain
on Tuesday. It will then be rather unsettled with many chances
for rain through the rest of the week. Temperatures will be
fairly close to normals.

Near term /until 6 am Tuesday morning/
Weak high pressure overspreading western and central pa late
this evening with partial clearing over central and western
areas. Clouds still slow to clear over the east... And earlier
thinking of 06z or afterwards still looks good for partial
clearing. Winds will be light as 1016 mb sfc high overspreads
the area... And mins will range from the lower 40s north to the
mid 50s southeast.

Short term /6 am Tuesday morning through 6 pm Tuesday/
Major trend is toward a lower chc of rain in the SE on Tuesday.

The NAM is very dry and the wet (a few hundreths) GFS and ec
keep any precip to the S of the turnpike. We will start to
weight the forecast toward less clouds and less chc of precip on
tues. Maxes will actually have a chance to overachieve on tues
with lots of Sun in the northern and central counties. 70s
widespread with m70s in the north.

Long term /Tuesday night through Monday/
Trough for Tue night positioned further to the west (over ia/mo)
in latest guidance, which will delay approach of surface low
pressure area and keep trend of mainly dry conditions in
central pa for Tuesday night and Wed morning.

But unsettled weather is on the way. Potent shortwave slides
through the trough for wed, as surface low deepens over the ohio
valley. With sharpening trough working eastward, low and
occluding front will lift across pa Wed night and Thursday
bringing periods of rain/showers and chance for an embedded
thunderstorm in an otherwise dreary day.

By Friday, the low lifts to our NE as trough axis lifts through.

Though the day should bring gradual improvement in the weather,
highs Fri could end up several degrees below current guidance in
caa NW flow, a thicker low-level cloud deck and potential for
light showers/drizzle - ESP NW half of cwa.

Sat should bring a return of brighter skies, albeit briefly,
and may end up being the nicest day of the long weekend as weak
ridge propagates through. Clouds will already be on the
increase Sat afternoon and persist into Sun and Mon as a warm
front develops over the ohio valley (with low pressure gradually
organizing over the midwest). Proximity of this frontal
boundary along with deepening trough over the western great
lakes will bring potential for showers Sun and mon. Plenty of
uncertainty in strength/placement of main weather features
across model guidance during this time however, so forecast
details remain somewhat elusive for late weekend.

Aviation /04z Tuesday through Saturday/
A slow-moving cold front, located from just east of ipt to
around mdt at 03z, is dying out as it pushes into eastern pa
late this evening. West of the front, drier air has arrived and
confidence inVFR conditions through tonight is high. East of
the front, clearing skies, low dewpoint depressions and light
wind will result in areas of fog overnight across southeast pa.

Near term model data suggest ipt will likely see a strong
enough push of drier air this evening to preclude significant
fog issues overnight. However, lns appears likely to experience
ifr conditions overnight and mdt is in between with about a
50/50 pct chance of fog later tonight.

Any fog across eastern pa will burn off around 12z, with a high
confidence forecast ofVFR conditions across most of central pa
for the rest of the day. The only tricky part to the forecast
is the possibility of very light rain, perhaps not even reducing
the CIGS belowVFR, over the southern tier of the state. Would
estimate about a 20 pct chance of late day MVFR CIGS at the
southern airfields, including jst,aoo,mdt and lns.

Outlook
Wed... Evening rain/low CIGS possible, ESP jst/aoo.

Thu... Rain/low CIGS likely.

Fri... Showers/MVFR CIGS nw.VFR se.

Sat... No sig wx expected.

Ctp watches/warnings/advisories
None.

Synopsis... Dangelo
near term... Dangelo/devoir
short term... Dangelo
long term... Lambert/rxr
aviation... Fitzgerald


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 73 mi44 min N 2.9 G 4.1 64°F 70°F1014.8 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 78 mi44 min NNW 4.1 G 5.1 64°F 1015.2 hPa
WASD2 - 8594900 - Washington, DC 81 mi44 min NNE 2.9 G 2.9 65°F 71°F1014.5 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 mi69 minNW 510.00 miFair60°F48°F67%1016.8 hPa

Wind History from HGR (wind in knots)
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Last 24hrS5S5S5S6S5S3S3S7S63S8S6CalmSE3CalmCalmS9S9S5W3NW4NW7NW5Calm
1 day agoCalmS8SE6S8SE5SE3CalmS4S5S3S7S8S10SE10S10SE5SE9SE8SE7SE6SE9S9SE9S9
2 days agoN3N10N11N9N10N12N10N10N10NE10E6N9N9N8NE8NE7NE6NE6NE7NE6NE5NE6NE5E5

Tide / Current Tables for Middle Branch, Baltimore Harbor, Maryland
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Middle Branch
Click for Map
Tue -- 04:29 AM EDT     Moonrise
Tue -- 05:29 AM EDT     1.69 feet High Tide
Tue -- 05:46 AM EDT     Sunrise
Tue -- 12:36 PM EDT     0.38 feet Low Tide
Tue -- 05:42 PM EDT     1.19 feet High Tide
Tue -- 05:48 PM EDT     Moonset
Tue -- 08:20 PM EDT     Sunset
Tue -- 11:51 PM EDT     0.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.50.81.21.51.71.71.51.310.80.50.40.40.50.711.21.21.10.90.60.40.3

Tide / Current Tables for Middle Branch, Baltimore Harbor, Patapsco River, Maryland
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Middle Branch
Click for Map
Tue -- 04:29 AM EDT     Moonrise
Tue -- 05:29 AM EDT     1.69 feet High Tide
Tue -- 05:46 AM EDT     Sunrise
Tue -- 12:36 PM EDT     0.39 feet Low Tide
Tue -- 05:42 PM EDT     1.19 feet High Tide
Tue -- 05:48 PM EDT     Moonset
Tue -- 08:20 PM EDT     Sunset
Tue -- 11:51 PM EDT     0.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.50.81.21.51.71.71.51.310.80.50.40.40.50.711.21.21.10.90.60.40.3

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 (1,6,7,8)
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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.