Monday, January25, 2021
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Marine Weather and Tides
Washington Boro, 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 7:17AMSunset 5:17PM Monday January 25, 2021 2:47 PM EST (19:47 UTC) Moonrise 2:17PMMoonset 4:52AM Illumination 93% Phase: Waxing Gibbous; Moon at 12 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- 1252 Pm Est Mon Jan 25 2021
This afternoon..NE winds 5 kt. Waves flat. Rain and snow likely. Vsby 1 to 3 nm.
Tonight..E winds 5 to 10 kt. Waves 1 ft. Snow, rain and freezing rain. Vsby 1 to 3 nm.
Tue..NE winds 5 to 10 kt. Waves 1 ft. Rain and freezing rain.
Tue night..NW winds around 5 kt. Waves flat.
Wed..NW winds 5 kt. Waves less than 1 ft.
Wed night..N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance of snow and rain.
Thu..NW winds 10 to 15 kt. Waves 1 to 2 ft.
Fri..NW winds 10 to 15 kt. Waves 1 ft.
ANZ500 1251 Pm Est Mon Jan 25 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will approach today before passing through Tuesday. High pressure will briefly return Wednesday, but low pressure may impact the waters Wednesday night and Thursday. High pressure will return late in the week. A small craft advisory may be needed for portions of the waters Tuesday, and again Thursday into Friday. Gale force winds will be possible on Thursday, possibly into Friday morning.


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 251823 AFDCTP

Area Forecast Discussion National Weather Service State College PA 123 PM EST Mon Jan 25 2021

SYNOPSIS. A large storm system with generally light mixed precipitation will affect Central PA into Tuesday. A few inches of snow, topped by a layer of sleet and freezing rain will be on the ground by Tuesday morning.

After a period of tranquil conditions with sightly above normal high temperatures Wednesday, another area of low pressure may brush the southern tier of the state with some light snow. High pressure should build in at the end of the week.

NEAR TERM /UNTIL 9 PM THIS EVENING/. Shield of pecipitation, which is currently all rain back into KY, is nearing. Isentropic lift on the N edge of the storm will bring some light precip into Somerset Co late this aftn. Kept the onset timing very similar as we have no strong indications that it will slow down. However, the precip will be fighting the dry air underneath while trying to fall through a warming layer sub-cloud, but still aloft. This will doubtlessly cause an identity crisis for the precip. The general progression should be from an initial light snow to a light mix of sleet and snow in the SW by nightfall. Temps are warming at the sfc this aftn and will probably climb a bit more before falling slightly this evening.

SHORT TERM /9 PM THIS EVENING THROUGH 6 PM TUESDAY/. Light precip should be underway across the srn tier, mainly snow, as we start the period. The progression from snow to a mix of sleet and snow, and then to mainly ZR/ZL is still expected t occur across all of the area. The NE will see all those things last, perhaps with no precip occurring until at or after sunrise. Timing looks pretty solid overall with the arrival/change/tapering-off. The precip probably won't be a constant itensity with many stops and starts with only very brief periods of moderate or heavy rates, if any at all. There even seems to be a dissipation of the first wave of precip which may die out altogether as it lifts through the central mtns toward I-80.

The travel troubles will be most notable Tues morning when people want to get out the door. The ice on top of the snow and sleet could make it a crunchy mess to clear off sidewalks, cars, etc. It may also make it a little easier to scoop underneath the crust of ice to clear it away. Regardless, untreated roads and especially bridges will be icy in the morning. The wind stays light all night for most places, but does get gusty right where it would be the worst location to have it get gusty - where there is the most ice expected. That will lead to some power outages with most of them in the Laurel Highlands.

Dry air arrives from the west through the daylight hours on Tues. The main low does not deepen at all, staying around 1005hPa as it lifts into wrn PA and NY. Some enhancement to precip rate may occur in the afternoon as it exits the eastern half of the CWA. Temps may warm just above freezing S of the turnpike to make it plain rain.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/. Lingering drizzle, freezing drizzle or snizzle remains possible into Tuesday night, before the storm system moves off the East Coast, and a few snow showers are possible across the northern mountains as colder air returns behind this system.

Wednesday looks like a quiet day between weather systems, with seasonable temperatures.

The model trend for the past 24 hours has been to push the next system farther to our south Wednesday night into Thursday. Have maintained some low PoPs for light snow across southern PA for this period, but the trend seems to be for less precip this far north.

There could be some snow showers across the northern and western highlands Thursday into Friday, as a chillier airmass returns behind a deepening low that will pull off the East Coast and out to sea.

Warm advection by next Sunday or Monday could result in some snow or a wintry mix.

AVIATION /18Z MONDAY THROUGH SATURDAY/. MVFR ceilings impacting JST/AOO early this afternoon, with generally VFR ceilings elsewhere across central PA. Cigs will lower this afternoon and evening as moisture approaches from the south with IFR returning to JST and AOO late this afternoon and evening. Cigs will continue to drop from southwest to northeast into tonight across the rest of central PA as snow, sleet and freezing rain moves into the region.

Snow looks to be the dominant precipitation mode to begin late this afternoon and early evening, before transitioning to a mix with sleet/freezing rain through the night as precipitation moves from southwest to northeast. Portions of southern PA, will likely see a changeover to some plain rain later tonight and near daybreak Tuesday, however cold air may remain locked into the Laurel Highlands leading to a longer period of freezing rain at JST and perhaps AOO early Tuesday morning.

Outlook .

Tues . Widespread restrictions to IFR with freezing drizzle north and liquid drizzle south.

Tues night-Wed . Becoming MVFR.

Wed night-Thu . Restrictions possible with a chance of snow south. Northwest winds increasing on Thursday.

Fri . Breezy, otherwise no sig wx.

CTP WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory from 4 AM to 4 PM EST Tuesday for PAZ037-041-042-046-051>053-058. Winter Weather Advisory from midnight tonight to 1 PM EST Tuesday for PAZ010>012-017>019-027-028-045-049-050-056-057-059- 066. Winter Storm Warning until noon EST Tuesday for PAZ033-034. Winter Weather Advisory from 9 PM this evening to noon EST Tuesday for PAZ024>026-035-036-063>065. Winter Weather Advisory from 2 AM to 4 PM EST Tuesday for PAZ004>006.

SYNOPSIS . Dangelo NEAR TERM . Dangelo SHORT TERM . Dangelo/Tyburski LONG TERM . Lambert/Martin/Evanego AVIATION . Guseman/Travis


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 49 mi48 min Calm G 1.9 36°F 36°F1019.2 hPa (-2.8)
BLTM2 - 8574680 - Baltimore, MD 51 mi48 min E 1.9 G 4.1 35°F 42°F1018.8 hPa (-3.0)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 54 mi48 min ESE 4.1 G 4.1 34°F 1019.3 hPa (-3.0)

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lancaster, Lancaster Airport, PA13 mi55 minN 010.00 miOvercast35°F13°F40%1019.1 hPa
Harrisburg, Harrisburg International Airport, PA21 mi52 minSE 310.00 miOvercast35°F15°F44%1018.8 hPa
York, York Airport, PA21 mi55 minN 010.00 miOvercast34°F18°F52%1019 hPa

Link to 5 minute data for KLNS

Wind History from LNS (wind in knots)
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Last 24hrNW8W7W5W5W3W3NW3N3W3CalmE3SE3CalmE3NE4NE5NE3CalmNE3NE4E3E3CalmCalm
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Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Mon -- 04:05 AM EST     0.16 feet Low Tide
Mon -- 04:49 AM EST     Moonset
Mon -- 07:17 AM EST     Sunrise
Mon -- 07:33 AM EST     0.91 feet High Tide
Mon -- 02:16 PM EST     Moonrise
Mon -- 02:31 PM EST     -0.63 feet Low Tide
Mon -- 05:16 PM EST     Sunset
Mon -- 08:45 PM EST     2.07 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.80.50.20.20.30.60.90.90.80.50.2-0.2-0.4-0.6-0.6-0.30.311.622.121.7

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Mon -- 02:23 AM EST     -0.05 feet Low Tide
Mon -- 04:49 AM EST     Moonset
Mon -- 07:17 AM EST     Sunrise
Mon -- 07:47 AM EST     1.24 feet High Tide
Mon -- 01:17 PM EST     0.05 feet Low Tide
Mon -- 02:16 PM EST     Moonrise
Mon -- 05:16 PM EST     Sunset
Mon -- 07:32 PM EST     2.11 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.1-0-00.20.60.91.21.21.10.80.50.20.10.10.40.91.41.82.12.11.91.61.2

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.
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