Tuesday, June27, 2017 L-36.com

Marine Weather and Tides
Colwyn, PA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:32AMSunset 8:35PM Tuesday June 27, 2017 10:07 PM EDT (02:07 UTC) Moonrise 8:35AMMoonset 10:28PM Illumination 16% Phase: Waxing Crescent; Moon at 4 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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ANZ430 Delaware Bay Waters North Of East Point Nj To Slaughter Beach De- 940 Pm Edt Tue Jun 27 2017
Overnight..NW winds 5 to 10 kt, increasing to 10 to 15 kt. Waves 2 ft or less.
Wed..NW winds 5 to 10 kt, becoming sw late. Waves 2 ft or less.
Wed night..S winds 5 to 10 kt. Waves 2 ft or less.
Thu..S winds 10 to 15 kt, increasing to 15 to 20 kt late. Waves 2 ft or less, then around 3 ft early in the afternoon.
Thu night..SW winds 15 to 20 kt. Waves around 3 ft in the evening, then 2 ft or less.
Fri..SW winds 10 to 15 kt. Waves 2 ft or less.
Fri night..S winds 10 to 15 kt. Waves 2 ft or less.
Sat..S winds 10 to 15 kt. Waves 2 ft or less.
Sat night..S winds 10 to 15 kt, becoming sw 5 to 10 kt after midnight. Waves 2 ft or less. A chance of showers and tstms.
Sun..W winds 5 to 10 kt. Waves 2 ft or less. A chance of showers and tstms.
Sun night..SW winds 5 to 10 kt. Waves 2 ft or less. A chance of showers and tstms in the evening. Winds and waves higher in and near tstms.
ANZ400 940 Pm Edt Tue Jun 27 2017
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. High pressure over the ohio valley will build east across the mid- atlantic region through Wednesday. The high pressure will move offshore for Thursday and Friday, returning our area to southwest flow. Another weak cold front is expected this weekend, bringing a chance of showers through early next week.

7 Day Forecast for Marine Location Near Colwyn , PA
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location: 39.9, -75.21     debug

Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 280140
area forecast discussion
national weather service mount holly nj
940 pm edt Tue jun 27 2017

High pressure over the ohio valley will build east across the
mid-atlantic region through Wednesday. The high pressure will
move offshore for Thursday and Friday, returning our area to
southwest flow. Another weak cold front is expected this
weekend, bringing a chance of showers through early next week,
especially if the front stalls.

Near term until 6 am Wednesday morning
Showers that developed across parts of the area this afternoon
and evening have dissipated and outside of a very isolated
shower, we should remain dry through the rest of the overnight

Skies are already starting to clear out and we should see some
drying occur as a more westerly flow is in place overnight.

Some low level moisture may linger a bit in areas where rain
fell through this evening, and some light patchy fog might
develop towards daybreak.

Light winds overnight combined with the clearing skies will
allow for good radiational cooling to take place. Already
starting to see some indication of this with 9pm temperatures
already falling in millville (65) and somerville (63) and
andover (61).

Overnight lows will fall into the 50s across the region with
near 60 in the urban areas around philadelphia and along the

Short term 6 am Wednesday morning through 6 pm Wednesday
Northwest flow becomes established tomorrow on the upstream
side of the shortwave trough moving through the area tonight. A
surface high will build into the eastern u.S. This sets the
stage for a very pleasant day, with skies mostly sunny and
temperatures slightly below seasonal averages. With some fairly
pronounced mixing, winds may gust to around 20 mph or so during
the afternoon. May also see a cumulus field develop during the
day, but subsidence above the boundary layer will keep these of
the "fair weather" variety.

Mos is in generally good agreement with highs tomorrow, but low-
level cold air advection will cease during the morning, with ridging
beginning to nose into the region as the day progresses. If this
happens sooner, forecast highs may be a bit on the low side. For
now, did not stray too far from a statistical MOS blend, given the
strong consensus. Highs will be around 70 in the poconos and near 80
southeast of the fall line.

Long term Wednesday night through Tuesday
The long term starts out with surface high pressure just off
the mid-atlantic coast and associated fairly pleasant weather.

However as the high moves farther offshore and low pressure
moves into the great lakes, a more typical summertime SW flow
will set up over the region. This in turn will cause increasing
heat and humidity over the forecast area through the end of the
week and into the weekend. At this point it appears that
Saturday may be the most uncomfortable day with heat indices
reaching the mid 90s along the i-95 urban corridor.

Along with more heat and humidity will be gradually increasing
chances for afternoon showers and thunderstorms. For Thursday
and Friday it looks like any precip should remain well to the
northwest of phl. By Saturday an upper-level trof and associated
cold front are forecast to approach the mid-atlantic and also a
surface trof is forecast to develop from eastern pa south
to near the chesapeake bay. Enhanced low-level convergence is
expected to result in more widespread afternoon convection on

For Sunday and beyond the forecast becomes more cloudy, as the
models seem to disagree on whether a surface cold front can push
through our area or whether it will stall out. Given the
uncertainty, the forecast maintains at least a slight chance for
showers t-storms through early next week. Temperatures are
expected to be near or slightly above normal at that time.

Aviation 02z Wednesday through Sunday
The following discussion is for kphl, kpne, kttn, kabe, krdg, kilg,
kmiv, kacy and surrounding areas.

Vfr conditions are expected to continue through the TAF period.

Overnight... Skies will clear out through tonight with light
westerly winds, less than 10 knots, across the terminals.

Wednesday...VFR conditions continue. Winds will pick up out of
the west northwest between 14-16z, becoming southwest around 10
knots with gusts up near 20 kts by late afternoon, winds will
lighten as we head into the evening. Skies look to be relatively
cloud free but some cumulus may develop during the afternoon.


Thursday and Friday...VFR conditions expected. Southwest winds
gusting up to 20 kt in the afternoon both days.

Saturday and Sunday... MostlyVFR conditions but lower at times
in scattered mainly afternoon showers and thunderstorms.

Sub-advisory conditions are expected through the period. Winds
should switch from southwest to northwest through the nighttime
hours, with speeds generally 10 to 15 kts with gusts to 20 kts.

Winds will switch back to southwest by afternoon tomorrow,
generally remaining around 10 to 15 kts with higher gusts. May
see gusts approach 25 kts by late afternoon, but predominantly
winds should stay below advisory criteria.


Thursday and Friday... SCA conditions may develop Thursday
afternoon and continue into Friday due to increasing SW winds
and building seas.

Saturday and Sunday... Winds and seas are expected to be somewhat
below SCA levels.

Phi watches warnings advisories
Pa... None.

Nj... None.

De... None.

Md... None.

Marine... None.

Synopsis... Amc
near term... Meola
short term... Cms
long term... Amc
aviation... Amc meola
marine... Amc cms

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PHBP1 - 8545240 - Philadelphia, PA 4 mi62 min 74°F 77°F1014.8 hPa
BDSP1 9 mi62 min 74°F 1015.4 hPa
MRCP1 - 8540433 - Marcus Hook, PA 13 mi62 min 73°F 1015.2 hPa
BDRN4 - 8539094 - Burlington, Delaware River, NJ 22 mi92 min 74°F 78°F1014.6 hPa
NBLP1 - 8548989 - Newbold, PA 29 mi62 min N 6 G 9.9 73°F 77°F1015.6 hPa
RDYD1 - 8551910 - Reedy Point, DE 30 mi62 min 73°F 79°F1015.3 hPa
DELD1 - 8551762 - Delaware City, DE 30 mi62 min NW 8 G 11 72°F 77°F1015.7 hPa
CHCM2 - 8573927 - Chesapeake City, MD 41 mi62 min W 5.1 G 7 73°F 81°F1016.1 hPa
SJSN4 - 8537121 - Ship John Shoal, NJ 42 mi62 min WSW 8.9 G 9.9 75°F 78°F1015.1 hPa
JCRN4 - Jacques Cousteau Reserve, NJ 47 mi98 min WSW 1.9 72°F 1015 hPa56°F

Wind History for Philadelphia, PA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Philadelphia, Philadelphia International Airport, PA2 mi74 minNNW 710.00 miPartly Cloudy74°F48°F41%1015.3 hPa
Philadelphia - Wings Field Airport, PA17 mi2.2 hrsNW 510.00 miMostly Cloudy72°F50°F47%1015.6 hPa
Philadelphia, Northeast Philadelphia Airport, PA17 mi74 minWNW 610.00 miFair73°F48°F43%1015.5 hPa
Mount Holly, South Jersey Regional Airport, NJ20 mi74 minWNW 610.00 miPartly Cloudy72°F48°F44%1014.8 hPa

Wind History from PHL (wind in knots)
Last 24hrS5S7S4N6NW7E5E5E4CalmNW3S4S4S3S6SW7W10SW12
1 day agoW9W10W8W8NW8N6NW7CalmNW5NW75NW6W5W1054SW8SW10SW9
2 days agoW9SW7SW5W7NW4NW5N5NW4CalmCalmSW3CalmSE6SW9W12

Tide / Current Tables for Penrose Avenue Bridge, Schuylkill River, Pennsylvania
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Penrose Avenue Bridge
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Tue -- 04:17 AM EDT     7.08 feet High Tide
Tue -- 05:34 AM EDT     Sunrise
Tue -- 09:35 AM EDT     Moonrise
Tue -- 11:38 AM EDT     0.01 feet Low Tide
Tue -- 04:55 PM EDT     6.17 feet High Tide
Tue -- 08:33 PM EDT     Sunset
Tue -- 11:28 PM EDT     Moonset
Tue -- 11:48 PM EDT     0.39 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Philadelphia, Pennsylvania Current
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Tue -- 01:48 AM EDT     2.24 knots Max Flood
Tue -- 05:05 AM EDT     -0.00 knots Slack
Tue -- 05:33 AM EDT     Sunrise
Tue -- 08:19 AM EDT     -2.15 knots Max Ebb
Tue -- 09:34 AM EDT     Moonrise
Tue -- 12:31 PM EDT     0.01 knots Slack
Tue -- 02:32 PM EDT     1.91 knots Max Flood
Tue -- 05:38 PM EDT     -0.00 knots Slack
Tue -- 08:33 PM EDT     Sunset
Tue -- 08:34 PM EDT     -2.13 knots Max Ebb
Tue -- 11:28 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Mid-Atlantic    EDIT

Wind Forecast for Philadelphia/Mount Holly, PA (22,6,7,8)
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Ground Weather Radar Station Philadelphia, PA
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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.