Saturday, December7, 2019
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Marine Weather and Tides
Washington Boro, PA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:12AMSunset 4:41PM Saturday December 7, 2019 4:32 PM EST (21:32 UTC) Moonrise 2:22PMMoonset 2:23AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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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ANZ530 Chesapeake Bay North Of Pooles Island- 338 Pm Est Sat Dec 7 2019
Rest of this afternoon..N winds 5 kt. Waves flat.
Tonight..E winds 5 kt. Waves flat.
Sun..S winds 5 to 10 kt. Waves 1 ft.
Sun night..S winds 5 kt. Waves less than 1 ft. A chance of rain or drizzle.
Mon..S winds 5 to 10 kt. Waves 1 ft or less. Rain.
Mon night..SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers.
Tue..SW winds 10 to 15 kt...becoming nw 5 to 10 kt. Waves 1 to 2 ft. Showers.
Wed..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the day.
ANZ500 338 Pm Est Sat Dec 7 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure over ohio will build across pennsylvania and northern maryland tonight, then shift offshore of new jersey on Sunday. Low pressure will develop over the central united states and lift into the great lakes Sunday into Monday. A warm front developing east of this area of low pressure over the carolinas is expected to lift northward across the mid-atlantic on Monday. The aforementioned low will drag its trailing cold front through the region Tuesday into Wednesday. Small craft advisories may be needed Sunday night into Monday, then become increasingly likely Monday night through Wednesday.


7 Day Forecast for Marine Location Near Washington Boro, PA
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location: 40, -76.49     debug


Area Discussion for - State College, PA
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FXUS61 KCTP 072055 AFDCTP

Area Forecast Discussion National Weather Service State College PA 355 PM EST Sat Dec 7 2019

SYNOPSIS. After a fair weather weekend, a volatile and stormy pattern is expected during the second week of December. Temperatures are forecast to surge well-above normal Monday and Tuesday, followed by a sharply colder trend Wednesday into Thursday. The brief warm-up will be accompanied by periods of rain which may end as light snow Tuesday night. A mid to late week drying trend will likely reverse by next weekend with another storm system on the horizon.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. Mainly clear skies expected tonight with min temps in the teens and 20s.

SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/. Clouds increase on Sunday with max temps rebounding 5-10 degrees over the western Alleghenies. Dry wx will hold during the day with POPs steadily increasing later Sunday night into early Monday morning. Leaned toward hires blend/HREF with highest precip probs in the far southeast zones by daybreak. QPF will be very light and with southeast flow could almost see a more misty/foggy/drizzle type pattern developing. Thermal profiles are very marginal particularly over the interior central mtns where some spotty light frozen/freezing precip is possible especially when considering wet-bulb effects. That said, sfc temps generally AOA 32F suggest little to no impact as predominant ptype becomes rain into later Monday morning.

LONG TERM /MONDAY THROUGH SATURDAY/. Big temperature swings are expected during the period. A significant warming trend is forecast early next week with max temperature departures +10-15 degrees above normal (widespread 40s and 50s). Unseasonably mild minimum temps are forecast Monday night with departures on the order of 15-20 degrees above normal as the primary PWAT axis (with values around +2 sigma) slides east across the region.

The mild surge will be accompanied by periods of light to moderate rain Monday and Tuesday. Rainfall amounts between 0.50 to 1 inch are forecast early next week. The warm air and rainfall will help to melt the snow over the Allegheny Front into the Upper Susquehanna River basin. Areas of fog are likely as the mild air moves over colder ground. Rises on rivers/streams are expected and will need to monitor risk of minor flooding across the northern tier. WPC indicates a MRGL risk of rainfall heavy enough to cause flooding of small streams and poor drainage areas over our far SW counties Monday into early Tuesday.

It will turn sharply colder midweek as arctic air blasts into the region. Temperatures will be on the decline over the NW Tuesday afternoon (non diurnal over the NW half) and drop quickly Tuesday night areawide. There will be some potential for residual water or slush to freeze up quickly by Wednesday. Highs are forecast to drop by 20-30 degrees between Tuesday and Thursday, with minimum wind chills in the single digits and teens Thursday morning.

There is also a chance that the cold air could catch up to the back edge of the rain and result in a period of snow at the end of the precipitation event on Wednesday. There should be some lake effect snow that develops in the wake of the system, but trajectories appear to be focused more into southwest NY.

Strong 1040+mb high pressure moves NE across the region Thu/Fri. The more active weather pattern may continue into next weekend with the GFS and ECMWF both showing a large, dynamic storm system bringing some modified tropical air up the eastern seaboard, potentially impacting portions of our region.

AVIATION /21Z SATURDAY THROUGH THURSDAY/. VFR conditions this afternoon through 18z Sunday. BFD remains on the southern edge of a field of cu downwind of Lake Erie, with cigs teetering between bkn-few at 025. Cigs will continue to lift and improve this afternoon-evening.

Will have to watch potential for swrly LLWS of 40+ kts starting in BFD Sunday afternoon/evening and overspreading the rest of the area Monday afternoon into Tuesday morning, as a few waves of low pressure pass to our west.

Cigs and vis will be reduced in periods of rain Monday and Tuesday.

Outlook.

Sun night . Lowering cigs. LLWS poss at BFD

Mon-Tue . Widespread SHRA/MVFR. IFR and LLWS poss. CFROPA Tues.

Wed . Restrictions NW half. Breezy NW wind.

CTP WATCHES/WARNINGS/ADVISORIES. None.

CTP WATCHES/WARNINGS/ADVISORIES. None.

SYNOPSIS . Steinbugl NEAR TERM . Steinbugl SHORT TERM . Steinbugl LONG TERM . Lambert/RXR/Steinbugl AVIATION . Martin/Colbert


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 49 mi51 min N 5.1 G 8.9 41°F 42°F1029.9 hPa
BLTM2 - 8574680 - Baltimore, MD 51 mi51 min NW 1.9 G 5.1 42°F 49°F1029.4 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 54 mi45 min NW 4.1 G 6 42°F 1030 hPa

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lancaster, Lancaster Airport, PA13 mi40 minNNW 710.00 miFair39°F17°F41%1029.4 hPa
Harrisburg, Harrisburg International Airport, PA21 mi37 minN 810.00 miFair41°F15°F35%1029.5 hPa
York, York Airport, PA21 mi40 minNW 610.00 miFair38°F18°F44%1030 hPa

Link to 5 minute data for KLNS

Wind History from LNS (wind in knots)
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NW8S6W4CalmCalmCalmSE3CalmCalmS3E3CalmSW8SW10SW6SW8SW8SW4SW6
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Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Sat -- 01:49 AM EST     0.54 feet Low Tide
Sat -- 02:21 AM EST     Moonset
Sat -- 06:27 AM EST     1.86 feet High Tide
Sat -- 07:11 AM EST     Sunrise
Sat -- 02:01 PM EST     -0.04 feet Low Tide
Sat -- 02:20 PM EST     Moonrise
Sat -- 04:40 PM EST     Sunset
Sat -- 07:30 PM EST     2.03 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.50.71.11.61.81.81.71.410.60.30-00.10.61.21.7221.91.61.3

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Sat -- 12:26 AM EST     0.27 feet Low Tide
Sat -- 02:21 AM EST     Moonset
Sat -- 06:02 AM EST     1.57 feet High Tide
Sat -- 07:11 AM EST     Sunrise
Sat -- 12:16 PM EST     0.10 feet Low Tide
Sat -- 02:20 PM EST     Moonrise
Sat -- 04:40 PM EST     Sunset
Sat -- 06:33 PM EST     1.99 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.30.50.81.21.51.61.51.20.90.60.30.10.20.40.91.31.7221.81.51.10.7

Weather Map
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wmap_A
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for State College, PA (16,3,4,5)
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Ground Weather Radar Station Dover AFB, DE
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weather_mapweather_map weather_map

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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 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.