Thursday, January21, 2021
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L-36.com

Marine Weather and Tides
Lancaster, PA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:20AMSunset 5:12PM Thursday January 21, 2021 10:17 PM EST (03:17 UTC) Moonrise 11:57AMMoonset 12:52AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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- 945 Pm Est Thu Jan 21 2021
.small craft advisory in effect from Friday morning through late Friday night...
Rest of tonight..W winds 10 kt. Waves 1 ft.
Fri..W winds 5 to 10 kt. Gusts up to 25 kt in the late morning and afternoon. Waves 1 to 2 ft.
Fri night..NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Sat..NW winds 10 to 15 kt with gusts to 30 kt. Waves 2 ft.
Sat night..NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft.
Sun..NW winds 5 to 10 kt. Waves 1 ft.
Sun night..NE winds around 5 kt. Waves 1 ft or less.
Mon..NE winds 5 to 10 kt. Waves 1 ft or less. Snow with rain likely.
Tue..N winds 5 to 10 kt. Waves 1 ft. A chance of snow and rain through the day.
ANZ500 945 Pm Est Thu Jan 21 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters late tonight, with another reinforcing cold front pushing through the region on Friday. High pressure over the midwest will build eastward through the weekend. Low pressure may impact the region early next week. Small craft advisories will likely be needed for portions of the waters through the weekend. A gale warning may be required for portions of the waters Saturday.


7 Day Forecast for Marine Location Near Lancaster, PA
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location: 40.04, -76.3     debug


Area Discussion for - State College, PA
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FXUS61 KCTP 220203 AFDCTP

Area Forecast Discussion National Weather Service State College PA 903 PM EST Thu Jan 21 2021

SYNOPSIS. A colder weather pattern resumes tonight and Friday with some lake effect snow showers resuming over the NW Alleghenies. There is increasing confidence in a storm system bringing snow or mixed precipitation Monday and Tuesday.

NEAR TERM /UNTIL 7 AM FRIDAY MORNING/. Toasty temps (m30s) in the NW are yielding some light rain instead of snow at this hour as the first trough of the night moves down from NY. Will just tweak the temps and wx type there for a couple of hours.

Prev . Nearly full sunshine being enjoyed throughout central PA as a moisture challenged cold front swings through eastern PA this afternoon. Broad southwest flow ahead of this feature allowed temperatures to warm to the mid and in some cases upper 40s across central and south central PA. Main sensible weather impacts are breezy conditions with southwest gusts to 30 kts.

Colder air moves over the eastern GLAKS later this evening and expect some light flurries and snow showers to resume over the Northwest Mountains late tonight and moving down into the Laurel Highlands by Friday morning with only light accums overnight.

SHORT TERM /7 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/. Low pressure tracking into Quebec will drag a stronger cold front through central PA Friday morning with more robust lake effect snow showers developing as a colder west-northwest flow takes hold behind the front. Inversion heights are progged to remain low, indicating relatively minor snow accumulations Friday into Saturday, focused primarily over the snow belt of northwest Warren County. Highs Friday will be 4 to 6F colder than Thursday ranging from upper 20s northwest to lower 40s southeast.

LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/. Lake effect snow showers continue Friday night and Saturday. Model profiles support high snow/water ratios, especially Friday night into Saturday when progged cloud layer temps are within the DGZ. Thus, by the time lake effect snow showers diminish Saturday evening, 2 day totals in the 3-6 inch range seem likely over parts of Warren/Mckean counties. However, it looks like sub advisory amounts for any 12hr period.

Upper trough axis and core of coldest air is progged to be over the region Saturday. GEFS 850mb temps between -14C and -16C suggest highs will range from only around 20F over the northern mountains, and around 32F across the Lower Susq Valley.

Long range guidance showing some consensus toward a snow event for the Mid- Atlantic states Monday into Tuesday. At this cwa would be on the northern edge of main system but with increasing potential of significant accums in some parts of the cwa. At this point, p-type seems to be a typical mix south/all snow north based on the synoptic pattern and 8H temps/thicknesses. The narrow N-S sfc high does not bode well for a prolonged snow event, but 12 hrs of precip is possible.

Also increased pops along the srn counties for Thur into Fri with potential of another mid atlc system.

AVIATION /02Z FRIDAY THROUGH TUESDAY/. VFR conds for most areas through this evening. MVFR cigs will redevelop over the far northwest with light lake effect snow showers activity late tonight into Friday morning. MVFR cigs become more widespread western and northern mountains Friday with more numerous SHSN, with MVFR to VFR conds elsewhere. Westerly winds will gust 20-30 kts across mainly the western half of the area on Friday.

Outlook .

Fri . Snow showers with tempo IFR vsbys possible BFD/JST.

Sat . No sig wx expected.

Sun . No sig wx expected.

Sun Ngt-Tue . Chc Light Snow.

CTP WATCHES/WARNINGS/ADVISORIES. None.

SYNOPSIS . DeVoir/Dangelo/Steinbugl NEAR TERM . DeVoir/Fitzgerald/Dangelo SHORT TERM . DeVoir/Fitzgerald LONG TERM . Dangelo/Gartner AVIATION . DeVoir/Colbert


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 44 mi78 min Calm G 1 31°F 39°F1004.8 hPa (+0.6)
DELD1 - 8551762 - Delaware City, DE 49 mi78 min WSW 4.1 G 5.1 38°F 31°F1004.3 hPa (+0.3)
MRCP1 - 8540433 - Marcus Hook, PA 50 mi78 min 37°F 40°F1003.9 hPa (-0.0)

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lancaster, Lancaster Airport, PA6 mi25 minWSW 510.00 miFair37°F22°F54%1003.8 hPa
Chester County Airport, PA23 mi43 minVar 510.00 miFair36°F23°F60%1003.7 hPa

Link to 5 minute data for KLNS

Wind History from LNS (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3CalmS5SW10
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Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Thu -- 12:51 AM EST     Moonset
Thu -- 04:12 AM EST     1.37 feet High Tide
Thu -- 07:20 AM EST     Sunrise
Thu -- 11:37 AM EST     -0.44 feet Low Tide
Thu -- 11:56 AM EST     Moonrise
Thu -- 05:11 PM EST     Sunset
Thu -- 05:18 PM EST     1.61 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.40.71.11.41.31.10.80.40-0.2-0.4-0.4-0.20.30.91.41.61.61.41.20.90.70.5

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Thu -- 12:51 AM EST     Moonset
Thu -- 03:40 AM EST     1.32 feet High Tide
Thu -- 07:20 AM EST     Sunrise
Thu -- 09:41 AM EST     0.01 feet Low Tide
Thu -- 11:56 AM EST     Moonrise
Thu -- 04:10 PM EST     1.85 feet High Tide
Thu -- 05:11 PM EST     Sunset
Thu -- 11:22 PM EST     0.22 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.81.11.31.31.20.90.60.30.100.20.511.41.71.81.81.61.30.90.60.40.2

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
Ground Weather Radar Station




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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 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.