Saturday, January25, 2020
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Marine Weather and Tides
Chambersburg, 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 7:23AMSunset 5:22PM Saturday January 25, 2020 2:25 PM EST (19:25 UTC) Moonrise 8:07AMMoonset 6:09PM Illumination 0% Phase: New Moon; Moon at 1 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- 1239 Pm Est Sat Jan 25 2020
This afternoon..W winds 10 kt. Waves 1 ft or less. Scattered showers.
Tonight..W winds 5 to 10 kt. Waves 1 ft.
Sun..W winds 5 to 10 kt. Waves 1 ft.
Sun night..W winds 5 to 10 kt. Waves 1 ft.
Mon..W winds 5 to 10 kt. Waves 1 ft.
Mon night..NW winds 5 to 10 kt. Waves 1 ft.
Tue..NW winds 5 to 10 kt. Waves 1 ft.
Wed..N winds 5 kt. Waves less than 1 ft.
ANZ500 1239 Pm Est Sat Jan 25 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A low pressure system will move away from the waters through tonight. Northwest flow ahead of weak high pressure will build behind this system. Small craft advisories may be required Monday night into 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 251828 AFDCTP

Area Forecast Discussion National Weather Service State College PA 128 PM EST Sat Jan 25 2020

SYNOPSIS. High pressure will build in very slowly from the north through the next few days. Expect the west to northwest wind to generate snow showers over the Allegheny Plateau and Laurel Highlands tonight into early Monday. The high pressure will keep it mainly dry for most of the upcoming work week. Near to slightly above average temperatures are forecast through the end of the month.

NEAR TERM /UNTIL 11 PM THIS EVENING/. Main band of rain and mix has pushed out of all but the far NE counties as of 1 PM. Spotty rain showers will last into the late aftn/early evening over all but the SErn third of the area. HRRR and NAM hint at a very light snowfall for the northern mountains as a weak vort max drives a little light precip through late this aftn. Have mentioned RA/SN mix there, but no accums until after 00Z. The flow aloft is already cyclonic and the upper low is nearing. A general upslope flow, cold advection and falling heights equate to a dismal, cloudy time for the evening over the west and north. Some breaks will shortly be appearing in the clouds over the SE in the developing downslope and will expand through the evening. Most places will stay cloudy. The temps dip slowly and the type of light precip over the western highlands will mix with and turn to snow through the early evening.

SHORT TERM /11 PM THIS EVENING THROUGH 6 PM SUNDAY/. The upper low spins overhead or just to our north through the night. An inch or two of snow is likely over the western highlands. Some fog could linger or thicken overnight, but the wind will try to keep it mixed. Most likely foggy places would be in the east, esp if the clearing happens close to sunset (which it looks like it will be). Will hold off on mentioning more than just patchy fog for now. The upper low lifts away on Sun, but the westerly flow will last through the period. Wind should pick up and get gusty as the daylight helps us mix, but gusts should be 25MPH or less. Mins tonight could be very homogeneous with at least partial clearing and lighter wind in the east overnight, they could be cooler than the cloudier, slightly more windy west. But, the wind is a downslope and guidance is a little milder in the SE. Will try to balance the two main factors and make them slightly more homogeneous than MOS guidance. Maxes on Sunday will be around normal in the west and 4-5F above in the east.

LONG TERM /SUNDAY NIGHT THROUGH SATURDAY/. Cyclonic flow aloft and westerly low level flow brings an expected period of upslope/orographic snow showers to the favored high terrain of the western Alleghenies Sunday through Tuesday next week. With mild air temperatures, moisture flux from Lake Erie should be limited and accumulations will be minor. Cloud cover will persist for all but perhaps the lower Susquehanna.

A weak and moisture-free cold front will drift south across the Commonwealth Tuesday resulting in a hardly-noticeable dip in high temperatures to a couple degrees below normal. It's remarkable that a degree or two departure below average is worth talking about, but that seems to be how the month and season have gone so far. Low temperatures will remain 5 to 10 degrees above average through the week.

High pressure will pass overhead Thursday night into Friday bringing ample sunshine to the Commonwealth, albeit short-lived. There is still considerable uncertainty with next weekend's weather. Both the operational GFS and ECMWF have backed off on winter storm potential because of phasing issues between surface moisture and cold air. Current guidance suggest a system of low pressure originating in the Gulf of Mexico will track off the east coast into the Atlantic and remain too warm to produce any snow. Meanwhile, the upper trough digging into the mid- Atlantic and bringing the cold air necessary to produce wintry precipitation, is disconnected in space and time. The system certainly bears watching, but with the track record of other winter storms so far this winter and the absence of any significant cold air in the forecast, it would be seems a fools errand to be hopeful for a significant snowfall to start February.

AVIATION /18Z SATURDAY THROUGH THURSDAY/. Main area of rain is off to the east of our terminals and spotty light SHRA filling in behind. Temps will be cooling as night falls and some snow will be mixing in late this aftn in BFD and over the northern mtns. Good but not strong upper forcing arrives just before the upper low passes overhead. The upslope/lake enhanced SHSN at BFD and JST will probably be most likely to make LIFR vis in the middle of the night, as the lowest upper heights should be overhead at 12Z. The showers that remain over the north and west after sunset will be all snow and perhaps a little snizzle (snow/drizzle mix).

Winds will be westerly at all terminals very shortly if they aren't already. Already some BINOVC in the SW and SE. While JST is expected to stay IFR for much of the TAF period, the downslope flow will help bring VFR conditions to MDT and LNS, and probably to IPT this evening. The wind does pick up and get a little gusty (20-22KT over the mountains) during the day on Sunday. The persistent westerly llvl flow will continue to generate -SHSN over the NW into Monday, and flurries will probably sneak into AOO, UNV and IPT here and there.

Outlook.

Mon . Snow showers ending early wrn 1/3.

Tue . Low cigs psbl wrn 1/3. Otherwise, no sig wx.

Wed-Thu . Mainly VFR.

CTP WATCHES/WARNINGS/ADVISORIES. None.

SYNOPSIS . Dangelo NEAR TERM . Dangelo SHORT TERM . Dangelo LONG TERM . Steinbugl/Banghoff AVIATION . Dangelo


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 73 mi56 min NW 5.1 G 8.9 39°F1009 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 78 mi56 min W 8.9 G 9.9 47°F 1009.5 hPa
WASD2 - 8594900 - Washington, DC 81 mi56 min WNW 4.1 G 8 49°F 40°F1010.6 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 mi33 minW 710.00 miOvercast46°F39°F79%1011.6 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)
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Last 24hrE5E5E8E6E11E10E14
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1 day agoCalmCalmN4N4N3CalmCalmNW5CalmW3NW4CalmNE4W4NW3CalmNW5N3NW6NW5NW5NE7NE7E8
2 days agoCalmCalmNW3CalmCalmE3CalmN3NE4E5NE4CalmE5NW3CalmE3CalmCalmCalmCalmCalmCalmW3SE3

Tide / Current Tables for Middle Branch, Baltimore Harbor, Maryland
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Middle Branch
Click for Map
Sat -- 02:20 AM EST     -0.05 feet Low Tide
Sat -- 06:59 AM EST     0.56 feet High Tide
Sat -- 07:19 AM EST     Sunrise
Sat -- 08:01 AM EST     Moonrise
Sat -- 01:10 PM EST     -0.39 feet Low Tide
Sat -- 05:18 PM EST     Sunset
Sat -- 06:06 PM EST     Moonset
Sat -- 07:59 PM EST     1.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.1-0-00.10.30.50.60.50.30.1-0.1-0.3-0.4-0.3-0.20.10.50.811.110.80.6

Tide / Current Tables for Middle Branch, Baltimore Harbor, Patapsco River, Maryland
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map
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wmap_A
GEOS Local Image of Mid-Atlantic    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 (14,3,4,5)
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Ground Weather Radar Station Sterling, VA
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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.