Sunday, April18, 2021
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Marine Weather and Tides
Windsor, PA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:22AMSunset 7:49PM Sunday April 18, 2021 4:28 PM EDT (20:28 UTC) Moonrise 9:28AMMoonset 12:14AM Illumination 43% Phase: First Quarter Moon; Moon at 7 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- 142 Pm Edt Sun Apr 18 2021
This afternoon..SW winds 10 kt. Waves flat.
Tonight..SW winds 5 kt. Waves flat.
Mon..SW winds around 5 kt. Waves 1 ft or less. A chance of showers.
Mon night..SW winds 5 kt. Waves less than 1 ft.
Tue..SW winds 5 to 10 kt. Waves 1 ft.
Tue night..S winds 5 to 10 kt. Waves 1 ft.
Wed..SW winds 10 to 15 kt...becoming w. Waves 1 to 2 ft. A chance of showers in the morning, then showers through the night.
Thu..W winds 10 to 15 kt. Waves 1 to 2 ft.
ANZ500 142 Pm Edt Sun Apr 18 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A broad area of low pressure will migrate from west to east near or south of the middle atlantic today through Monday. High pressure will develop to the south Tuesday ahead of a strong cold front which will pass through Wednesday. A small craft advisory may be needed Tuesday. A gale warning may be needed for portions of the waters Wednesday afternoon into Wednesday night.


7 Day Forecast for Marine Location Near Windsor , PA
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location: 39.9, -76.53     debug


Area Discussion for - State College, PA
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FXUS61 KCTP 181803 AFDCTP

Area Forecast Discussion National Weather Service State College PA 203 PM EDT Sun Apr 18 2021

SYNOPSIS. A pair of weakening shortwaves will lift into the region from the Ohio Valley tonight and early Monday. A deepening upper level trough will then swing across the area by Wed. Temperatures will drop significantly later Wed and Wed night. Northwest flow will generate snow showers Wed night and Thurs over the Alleghenies. The end of the work week looks dry with temperatures rebounding.

NEAR TERM /THROUGH TONIGHT/. Open cellular cumulus, mainly shallow, has overtaken central PA early afternoon skies as anticipated. This as remnants of a filling/shearing upper low track into western and central by this evening. Low PW accompanying both these systems will limit potential shower activity, which should be to isolated showers focused over the western highlands later this afternoon and this evening.

After isolated evening shower activity subsides, most areas will remain mostly cloudy overnight under the influence of the shearing/decaying upper trough.

SHORT TERM /MONDAY/. A second shearing shortwave/split trough crosses the region on Monday morning, bringing another slight uptick in shower chances Monday morning. Any isolated showers over the eastern counties should end by by 18Z Monday, as shortwave exits the area. Ridging at the surface and aloft is indicated by Monday afternoon, supporting fair weather. Mostly sunny skies and a developing southwest flow should keep our warming trend going, with temperatures rising into the 60s over most of the area by Monday afternoon.

LONG TERM /MONDAY NIGHT THROUGH SATURDAY/. Zonal flow overhead at the start of the period will quickly amplify with energy dropping down from the Upper Great Lakes. This should help to rapidly develop a cyclone over the OH Valley. This low had been progged consistently over the last few days to pass to our west/north, but very close to the CWA. However, the newest guidance has begun to speed the system up and decrease the moisture quite a bit. Dry air wrapped in from the west means less of a chance for everyone to get wet late Tues night and Wed. The faster speed of the system also means less of a chance for thunder with the low/cold front arriving around sunrise and blasting thru the CWA by 17-18Z. Have tempered the significant speed increase a bit keeping continuity in mind, but the NAM and GFS both take the front to the east of the CWA by 17Z (GFS perhaps even a little faster). The more notable thing on Wed will be the blustery conditions with temps dropping over the west and even the central counties in the late morning and aftn. Expect only a brief lull, then, until the NW flow brings in lake effect showers which will mix with snow before nightfall in the west and turn to plain snow showers in the early evening. Temps continue to cool with mins in the m20s Wed PM. 8H temps will be -10C by midnight. There could be a coating of snow across the north and Laurels, esp on the higher elevations.

Thursday may be the more blustery day with gusts into the 30s possible. While temps in the SE get back down to the 30s again Thursday night, the wind will likely keep up enough to preclude a widespread frost for those areas already in the growing season. Temps rebound quickly on Friday with fair wx. Progressive pattern brings another fast-moving system across on Sat/Sat PM. This, too, could be moisture-challenged.

AVIATION /18Z SUNDAY THROUGH FRIDAY/. Predominantly VFR conds are expected today into this evening. Spotty rain showers are possible late in the day across the northern and western highlands /in the vicinity of BFD and JST/. Winds will again become northwesterly at 5-10 kts.

Outlook .

Mon . Generally VFR, although a few showers are possible late across eastern PA.

Tues . Generally VFR.

Tues night-Wed . Showers overspread the area, with restrictions developing.

Thu . Northwesterly flow, with restrictions and spotty rain or snow showers N/W PA.

CTP WATCHES/WARNINGS/ADVISORIES. None.

SYNOPSIS . DeVoir NEAR TERM . DeVoir SHORT TERM . DeVoir LONG TERM . Dangelo AVIATION . DeVoir/Evanego/Travis


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 44 mi58 min WSW 4.1 G 7 60°F 52°F1010.2 hPa
CHCM2 - 8573927 - Chesapeake City, MD 46 mi58 min WSW 8 G 13 63°F 58°F1010.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 47 mi58 min SE 8 G 11 58°F 1010.6 hPa
FSNM2 47 mi58 min SE 8 G 8.9 60°F 1010.4 hPa

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
York, York Airport, PA18 mi35 minVar 410.00 miMostly Cloudy62°F35°F37%1010.3 hPa
Lancaster, Lancaster Airport, PA19 mi35 minWSW 1010.00 miOvercast65°F39°F39%1009.8 hPa

Link to 5 minute data for KTHV

Wind History from THV (wind in knots)
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Last 24hrW8W8W8W4W4CalmW3CalmCalmCalmCalmCalmCalmCalmCalmCalmNW3W343N55SW54
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W7NW9NW33W3W4CalmCalmCalmNW4N9NW7W3NW9
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W9W6W5NW6CalmW3CalmW5W3W4NW6W65--NW9W8
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Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Sun -- 01:11 AM EDT     Moonset
Sun -- 03:31 AM EDT     1.90 feet High Tide
Sun -- 06:22 AM EDT     Sunrise
Sun -- 09:54 AM EDT     0.66 feet Low Tide
Sun -- 10:26 AM EDT     Moonrise
Sun -- 03:41 PM EDT     2.90 feet High Tide
Sun -- 07:45 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.21.61.91.91.71.51.20.90.70.70.81.31.82.42.82.92.72.52.11.71.41.11

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland (2)
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Havre de Grace
Click for Map
Sun -- 01:11 AM EDT     Moonset
Sun -- 02:38 AM EDT     1.59 feet High Tide
Sun -- 06:22 AM EDT     Sunrise
Sun -- 08:26 AM EDT     0.55 feet Low Tide
Sun -- 10:26 AM EDT     Moonrise
Sun -- 02:48 PM EDT     2.42 feet High Tide
Sun -- 07:45 PM EDT     Sunset
Sun -- 10:39 PM EDT     0.72 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.31.51.61.41.20.90.70.60.60.81.21.62.12.32.42.321.71.41.10.90.80.7

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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