Thursday, August6, 2020
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Marine Weather and Tides
West Reading, 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 6:05AMSunset 8:13PM Thursday August 6, 2020 8:30 PM EDT (00:30 UTC) Moonrise 9:12PMMoonset 7:51AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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- 738 Pm Edt Thu Aug 6 2020
Tonight..E winds 5 to 10 kt. Waves 1 ft or less. Numerous showers and scattered tstms this evening, then scattered showers with isolated tstms after midnight with vsby 1 to 3 nm.
Fri..E winds 5 kt. Waves flat. Showers likely with a chance of tstms. Patchy fog. Vsby 1 to 3 nm.
Fri night..NE winds 5 kt. Waves flat. Showers likely with a chance of tstms.
Sat..N winds 5 kt. Waves flat. A chance of showers.
Sat night..S winds around 5 kt. Waves flat.
Sun..SW winds around 5 kt. Waves flat.
Sun night..S winds 5 to 10 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft.
Tue..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 738 Pm Edt Thu Aug 6 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A stationary boundary will linger near the region and our marine areas through Friday. This will result in chances for showers and Thunderstorms each day during the late afternoon and evening.


7 Day Forecast for Marine Location Near West Reading , PA
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location: 40.34, -75.95     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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FXUS61 KPHI 062336 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 736 PM EDT Thu Aug 6 2020

SYNOPSIS. A weak stationary front will remain near the Mid Atlantic and northeast coast through Friday, as an area of low pressure moves northeastward along it from Virginia tonight to near Cape Cod by Saturday morning. High pressure will build over New England this weekend into early next week. A cold front will approach the region slowly around the middle to end of next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/.

After this morning's showers and thunderstorms, most activity for the remainder of the day and this evening has remained south and west of the area. The frontal boundary remains draped across the Mid Atlantic region and northeast coast this evening, and is not expected to move much during the overnight hours. An east to southeast flow has been in place across the area with high pressure to the north, which has kept the area relatively cloudy and cool for much of the day, although fairly humid, which has kept instability down and surpressed the convection across the area.

The first half of the overnight will likely remain dry for most places, although a few scattered showers or thunderstorms are possible. However, as we move into the second half of the overnight and through daybreak Friday, our precipitation chances will increase. An area of low pressure will advance along the frontal boundary draped near the area, while a stronger short wave/vorticity impulse approaches as well. There will be instability in place with 500-1000 J/kg of CAPE, and moisture will increase with PWATs generally 1.5 inches down to the Fall Line, and as much as 2 inches in Delmarva. Going through the overnight, PWATs will creep up to 2 inches across northern zones and as high as 2.25 inches in southern zones. Periods of heavy rainfall become more likely late in the night and toward daybreak, and antecedent conditions remain quite wet from Tropical Storm Isaias and other rain events, it will not take much rain to result in flash flooding. The Flash Flood Watch remains in place through midday Friday.

SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/. Rainfall intensifies over northern areas Friday morning, and 1-2 inches of QPF are possible during through Friday morning. Flash Flood Watch remains in effect through midday Friday.

A lull in showers, or at least the heaviest showers, is possible Friday afternoon, but as that aforementioned trough axis digs east, another round of showers and thunderstorms will develop late in the afternoon.

Once again, heavy rain is the primary threat.

Easterly flow remains in place, and with abundant cloud cover and rainfall, highs on Friday will remain in the 70s to low 80s.

LONG TERM /SATURDAY THROUGH THURSDAY/. A closed low that interacted with Tropical Storm Isaias will finally exit the Canadian Maritimes early Friday morning, leaving behind fragmented energy in the form of a shortwave trough over the Hudson Bay area. As the mid-level trough progresses east across the region Saturday, height falls around 20 m will combine with PWATs near 1.8” (between the 75th and 90th percentile for this time of year) to yield high chances of precipitation Friday night into Saturday afternoon. Once the system moves out of the region late Saturday night, subsidence behind the trough will bring in drier air with PWATs falling to around 1.20”. Low temperatures Sunday morning will be in the upper 60s, or relatively cool compared to previous nights, but near normal for this time of year. Weak high pressure will center over central PA with high temperatures in the mid to upper 80s. Dry weather is expected as PWATs remain around 1.20”.

Mid-level heights will begin to rise on Monday in advance of the next upper level low with low level flow turning from the southwest. As this occurs, the residual air mass from the previous week will quickly surge north with PWATs rising to around 1.40”. There is uncertainty on how quickly the Delaware Valley will transition to the moisture rich air, but the overall thinking is sometime in the afternoon hours. Due to this, showers and thunderstorms are expected across the region Monday afternoon. The upper level low will then move eastwards across Manitoba. On Tuesday, a mid-level disturbance will approach the area from the west. The GFS and European are agreeing well with the positioning of this disturbance. The best chance of precipitation with this disturbance appears to be Tuesday evening through Wednesday morning.

Wednesday afternoon, the wave will be exiting the region with a rather zonal flow setting up over the Delaware Valley. There is, again, uncertainty with the following upper level low that is expected to be near the Hudson Bay. The GFS has a higher amplitude low, while the European shows the low going more northward and being less amplified. The GFS is quicker with the front and brings it further south (central PA by Friday), while the European keeps the front well north of the region. For now, we have kept POPs close to climatology with a daily chance of showers and thunderstorms.

AVIATION /23Z THURSDAY THROUGH TUESDAY/. The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Tonight . Mostly VFR remain in place across the TAF sites, except southern New Jersey and southern Delaware, where ACY is MVFR. Conditions lower to MVFR then IFR later tonight after 06z/07 as showers and possible thunderstorms are expected to lead to lower ceilings and visibilities. East to southeast wind 5-10 knots will become light and variable for many locations overnight. Moderate confidence.

Friday . IFR will begin the day with showers and possible thunderstorms ongoing. Conditions slowly improve to MVFR by midday. Showers and possible thunderstorms could linger in to the afternoon. Winds will remain east to southeast 5-10 knots or less. Low confidence.

Outlook . Friday night . Conditions will remain unsettled Friday night into Saturday morning with multiple rounds of showers and thunderstorms expected. In any stronger showers and thunderstorms sub-VFR conditions will be possible. Winds out of the northeast around 10 kts. Some thunderstorms may contain brief gusty winds. Moderate confidence in overall trend, low confidence in details.

Saturday and Saturday night . Mostly VFR conditions expected with showers and thunderstorms possible. Late Saturday afternoon into evening the chance of precipitation will start to diminish. Light and variable winds slowly backing from the northwest. Patchy fog possible Saturday night.

Sunday . VFR conditions expected with dry weather. Light westerly winds, with an inland moving sea breeze likely in the afternoon hours.

Monday . Mainly VFR. A slight chance of thunderstorms in the afternoon with brief restrictions possible. Southwest winds 5 to 15 kt. Moderate confidence.

MARINE. Tonight through Friday . Overall, sub-Small Craft Advisory conditions will be in place with SE to E flow 10 kt or less and 2-3 ft seas. However, several rounds of showers and thunderstorms will result in locally higher winds and seas, as well as reduced VSBY in heavy rain..

Outlook . Friday night into Saturday . Showers and thunderstorms appear likely with sub-SCA winds and seas expected.

Saturday night through Tuesday . Sub-advisory winds/seas expected through the period. Cannot rule out a stray shower or storm during the afternoon/evening hours, but chances appear rather low overall.

Rip Currents .

Seas continue to subside in the wake of Isaias. A low risk for the formation of dangerous rip currents is expected through Friday.

EQUIPMENT. The NOAA Weather Radio All-Hazards broadcast from Hibernia Park Pennsylvania (Station WNG-704) remains off the air.

PHI WATCHES/WARNINGS/ADVISORIES. PA . Flash Flood Watch through Friday afternoon for PAZ060-070-071- 101>106. NJ . Flash Flood Watch through Friday afternoon for NJZ009-010- 012>027. DE . Flash Flood Watch through Friday afternoon for DEZ001>004. MD . Flash Flood Watch through Friday afternoon for MDZ008-012-015- 019-020. MARINE . None.



Synopsis . Haines Near Term . MPS/Robertson Short Term . MPS Long Term . Gant Aviation . Haines/MPS/Robertson Marine . Haines/MPS Equipment . WFO PHI


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MRCP1 - 8540433 - Marcus Hook, PA 46 mi42 min 81°F
PHBP1 - 8545240 - Philadelphia, PA 51 mi42 min 78°F 79°F1018.4 hPa

Wind History for Philadelphia, PA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Reading, Reading Regional Airport, PA3 mi36 minVar 410.00 miA Few Clouds78°F68°F71%1018.4 hPa
Pottstown, Pottstown Limerick Airport, PA22 mi36 minN 08.00 miFair75°F66°F74%1018.8 hPa
Lancaster, Lancaster Airport, PA24 mi37 minESE 410.00 miMostly Cloudy77°F68°F74%1018.2 hPa

Link to 5 minute data for KRDG

Wind History from RDG (wind in knots)
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Last 24hrCalmCalmSW3CalmN4N3CalmNW4NW4N5N6N55NE4NE8NE853SE7E5SE6SE5SE34
1 day agoS6SW8SW4SW4SW4S3CalmCalmCalmCalmCalmCalmW5NW5CalmW4SW7NW7NW11SW53W5SW6W3
2 days agoCalmCalmS3SW4CalmCalmCalmCalmN3CalmNE3N7N8N12N14
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G32
N13W16
G25
W10
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W7SW8SW9S7

Tide / Current Tables for Edgemoor, Delaware
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Edgemoor
Click for Map
Thu -- 02:31 AM EDT     6.22 feet High Tide
Thu -- 06:06 AM EDT     Sunrise
Thu -- 08:50 AM EDT     Moonset
Thu -- 09:48 AM EDT     0.36 feet Low Tide
Thu -- 03:01 PM EDT     5.47 feet High Tide
Thu -- 08:08 PM EDT     Sunset
Thu -- 09:51 PM EDT     0.72 feet Low Tide
Thu -- 10:08 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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45.36.16.15.44.33.22.31.40.60.41.22.6455.55.14.23.22.21.50.90.71.4

Tide / Current Tables for Millside, RR. bridge, Delaware
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Millside
Click for Map
Thu -- 02:47 AM EDT     5.97 feet High Tide
Thu -- 06:06 AM EDT     Sunrise
Thu -- 08:50 AM EDT     Moonset
Thu -- 09:56 AM EDT     0.34 feet Low Tide
Thu -- 03:17 PM EDT     5.25 feet High Tide
Thu -- 08:09 PM EDT     Sunset
Thu -- 09:59 PM EDT     0.69 feet Low Tide
Thu -- 10:09 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.64.85.765.44.43.32.31.50.70.312.33.64.65.25.14.33.32.31.610.71.2

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
Wind Forecast for Philadelphia/Mount Holly, PA (20,4,5,8)
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Ground Weather Radar Station Philadelphia, PA
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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.