Marine Weather and Tides
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 6:51AM||Sunset 4:40PM||Tuesday November 21, 2017 7:05 AM EST (12:05 UTC)||Moonrise 9:24AM||Moonset 7:19PM||Illumination 8%|
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|ANZ430 Delaware Bay Waters North Of East Point Nj To Slaughter Beach De- 641 Am Est Tue Nov 21 2017 |
.small craft advisory in effect through this evening...
Today..S winds 10 to 15 kt with gusts up to 30 kt. Waves around 3 ft.
Tonight..SW winds 10 to 15 kt with gusts up to 25 kt. Waves around 3 ft in the evening, then 2 ft or less. A chance of showers late in the evening. Showers likely after midnight.
Wed..NW winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt in the late morning and afternoon. Waves 2 ft or less. Showers likely early in the morning.
Wed night..N winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt late. Waves 2 ft or less.
Thu..NW winds 5 to 10 kt. Waves 2 ft or less.
Thu night..W winds 5 to 10 kt. Waves 2 ft or less.
Fri..W winds 5 to 10 kt. Waves 2 ft or less.
Fri night..SW winds 5 to 10 kt. Waves 2 ft or less.
Sat..SW winds 10 to 15 kt. Waves 2 ft or less. A chance of showers.
Sat night..W winds 10 to 15 kt. Waves 2 ft or less.
|ANZ400 641 Am Est Tue Nov 21 2017 |
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. A cold front will cross the area Tuesday night and early Wednesday, followed by high pressure into Saturday. Another cold front is expected to cross the area Saturday night, with high pressure anticipated for the first part of next week.
7 Day Forecast for Marine Location Near Riverton , NJHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 211147|
area forecast discussion
national weather service mount holly nj
647 am est Tue nov 21 2017
A cold front will cross the area Tuesday night and early Wednesday,
followed by high pressure into Saturday. Another cold front is
expected to cross the area Saturday night, with high pressure
anticipated for the first part of next week.
Near term until 6 pm this evening
600 am update: made some minor adjustments to hourly
temperatures and winds. Otherwise, going forecast is in good
Digging vort MAX in the upper midwest will continue southeastward
through the great lakes region today. Downstream, midlevel ridging
will amplify in response to low-level warm-air advection expanding
the atmospheric column. Predecessor perturbations in the flow will
progress through the east today, though these should have generally
minimal impacts on sensible weather other than increasing high
clouds, especially this afternoon. As the surface ridge to our south
continues offshore today, southwesterly flow will continue, getting
a boost from diabatic heating and a strong surface low moving
through ontario (aiding in an increased surface pressure gradient).
As such, expect breezy conditions again today, especially
along southeast of the urban corridor, as areas to the northwest
will be in somewhat of a surface col by afternoon.
Statistical guidance shows good agreement, but I suspect there is a
bit of a cool bias with temperatures today given the warming
profiles and the amplified ridging. Hard to go against good
agreement among the guidance, but I did nudge up temperatures a
degree or two in spots from the inherited forecast. It is quite
possible that philly reaches 60 today, with overall MAX temperatures
about 2-7 degrees above seasonal averages.
Short term 6 pm this evening through 6 am Wednesday
A perturbation over the southeast will lift northeastward during the
day, likely in vicinity of the carolinas by 21z. Precipitation
should break out near this vort max, with a surface wave likely
developing during the day near or off the coast of florida. This
southern-stream system will be affected strongly by the northern-
stream vort max, with some phasing likely to occur during the
overnight period, and rapid development northeastward progression of
the surface low near off the carolina coast. However, despite the
overall excellent agreement in the large-scale pattern, the NAM gfs
depictions of the southern-stream low leave some question marks. The
gfs looks a little on the fast progressive side, which is a typical
bias it exhibits in the short term. Comparison to the rgem suggests
it might be on the order of 3 hours too fast, and this difference
may be enough to keep the GFS too dry tonight. It will be critical
to watch the evolution of the southern-stream system today (and the
precipitation upscale feedback processes) to determine if the GFS is
keeping us too dry tonight.
Meanwhile, the NAM looks very similar to the rgem in the overall
evolution of the system tonight, but the NAM is simply drier than
the rgem (another bias observed on multiple occasions this season).
Based on this (and the GFS bias), I weighted guidance that was
slightly slower wetter (e.G., the NAM nest and the wrf-arw, along
with the rgem) somewhat higher. Also included some of the 00z ecmwf
with the QPF grids tonight, despite its coarser resolution, as it
seems to be doing a good job this fall depicting the cutoff of the
poleward side of the precipitation somewhat better than the NAM gfs
(likely because of its general slower deeper depictions of these
The northern-stream upper-level jet streak will be in a favorable
position by night's end for rather deep ascent, but by this point,
the stronger lift will probably be offshore. Nevertheless, mesoscale
banding of the precipitation is clearly evident in most of the model
simulations tonight, and this does occur as far west as i-95 in most
of these simulations. This makes the QPF a challenge, since these
setups can be underdone in the models (both with precipitation rates
and the slow progression of these phenomena compared to the speed of
deep-layer flow). This was another reason I upped the QPF from the
previous forecast, but tempered to some degree versus the wettest
guidance (sref ecmwf).
With the above in mind, brought pops up to chance generally urban
corridor southeastward and to likely southeast of a dover, de, to
sandy hook, nj, line. The timing of the precipitation looks to be
mainly after midnight, but there is some uncertainty here given the
discrepancies mentioned earlier. Amounts generally in the tenth to
quarter inch range along southeast of i-95 to potentially a half
inch near the coast, but confidence in these values is low because
of the uncertainty with the exact track of the precipitation. Also,
the cutoff of the precipitation will likely be sharper than I have
depicted in the grids (an inevitable result of precipitation
forecast uncertainty). Bottom line: large errors in the pops QPF are
possible tonight given the remaining model discrepancies.
Temperatures were generally a blend of met mav ecs mos, though I did
nudge temperatures up a little, in general given the increased
clouds and remaining low-level south southwest fetch. Looks like
temperatures will be too warm for non-liquid, non-freezing
precipitation anywhere in our CWA through daybreak.
One final note: given the strengthening dynamics aloft, strong lift
will aid in midlevel cooling possibly enough to generate some
marginal instability. Not totally out of the question to see a
couple lightning strikes, though the best chances are offshore.
Long term Wednesday through Monday
The extended period starts off with a cold front near or along the
coast Wednesday morning, moving east. Chillier air, normal for this
time of year, will move in behind this front. With ridging aloft
over the western u.S. And troughiness in the east, a seasonably cool
but mostly dry pattern is expected through most of the long term
period, with a chance of precipitation later Saturday and Sunday as
another cold front and associate deep upper level trough crosses the
The FROPA early Wednesday will trigger a few showers N W of phl. A
sfc low pressure is also forecast to develop off the nc sc coasts
with moisture spreading north ahead of it along the de nj coastal
areas. The highest pops continue over southern nj and delmarva,
counter to climo. Overnight temps should remain warm enough so that
all precip will be in liquid form. However a few showers may linger
past sunrise, and with cold advection behind the front a few snow
showers or flurries are possible in the poconos Wednesday morning.
The weather for Wed afternoon through Friday night will be dominated
by high pressure moving across the mid-atlantic region. Temperatures
will be a few degrees below normal on Thursday but should return to
near normal by Friday as the high shifts offshore and a more swly
flow develops. A cold front may push south in to ny state and new
england on Friday but probably will not affect our area to the south,
another fast-moving frontal system is forecast to push through our
area on Saturday. In part because of its fast movement it will not
be able to pick up much moisture. The current forecast continues
chance pops, higher N W of phl, but even this may be overdone.
Again, temps on Saturday appear to be warm enough to avoid any
frozen precip. However, the airmass behind this front seems to be
colder than the one mid-week, with strong low level cold advection
beginning Saturday night and continuing through the rest of the
weekend. This pattern of NW flow will favor lake effect snow with
some streamers possibly reaching the poconos and vicinity.
Aviation 12z Tuesday through Saturday
The following discussion is for kphl, kpne, kttn, kabe, krdg, kilg,
kmiv, kacy and surrounding areas.
Today...VFR with southwest winds 5 to 15 kts with occasional gusts
to 20 kts or so, especially from the i-95 corridor southeastward.
Tonight... Rapidly increasing clouds, possibly to sub-vfr,
especially closer to the coast. Showers should spread from
southwest to northeast through the area after 06z Wednesday,
mainly confined to the urban corridor southeastward. For now,
confidence only high enough for mention in the miv acy tafs as a
prevailing condition. Sub-vfr vsbys CIGS are possible with the
heavier showers, but confidence on timing and how far inland the
precipitation reaches is very low, so kept tafs generallyVFR
through the period for now. Winds generally southwest around or
below 10 kts, with some veering to westerly expected by
daybreak. Medium confidence with winds; low confidence with
Wednesday... Rain possible south and east of i-95 early Wednesday
morning with MVFR or lower conditions... Then becomingVFR. Sw
winds 5-10 kt become NW Wednesday afternoon and increase to
Wednesday night and Thursday...VFR. NW winds gradually diminishing.
A storm system is currently expected to remain offshore. Forecast
confidence: medium to high.
Friday...VFR. NW winds 5-10 kt.
Saturday and Saturday night...VFR early... Then MVFR or lower
conditions possible in rain showers later in the day and at night.
Sw winds 10-15 kt.
Small craft advisory in effect for delaware bay and the delaware
atlantic coastal waters through today and for the new jersey coastal
waters through this evening as strong southwest winds
continue increase today. Winds should diminish overnight, especially
over delaware bay and the adjacent atlantic waters, though
confidence is not particularly high given the potentially brief
duration of these lighter winds.
Showers should spread northeastward overnight (generally after
midnight), with localized restrictions possible. Expect erratic
gusts and locally very choppy seas in vicinity to showers. A
lightning strike or two is not out of the question, though the
probability is too low for inclusion in the forecast at this point.
Wednesday... Lull in SCA conditions possible Wednesday morning.
Otherwise, winds shift to the NW and increase to 15-20 kt with 25-30
Thursday through Friday... Sub-sca conditions expected.
Saturday and Sunday... SCA conditions are possible with the passage
of a strong cold front.
Phi watches warnings advisories
Marine... Small craft advisory until 1 am est Wednesday for anz450>453.
Small craft advisory until 7 pm est this evening for anz430-
near term... Cms
short term... Cms
long term... Miketta
aviation... Cms miketta
marine... Cms miketta
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|BDSP1||4 mi||47 min||40°F||47°F||1020.2 hPa|
|PHBP1 - 8545240 - Philadelphia, PA||9 mi||47 min||39°F||49°F||1020 hPa|
|BDRN4 - 8539094 - Burlington, Delaware River, NJ||9 mi||89 min||SW 4.1 G 6||40°F||45°F||1020.3 hPa|
|NBLP1 - 8548989 - Newbold, PA||16 mi||47 min||S 4.1 G 6||38°F||45°F||1020.8 hPa|
|MRCP1 - 8540433 - Marcus Hook, PA||26 mi||53 min||42°F||53°F||1020.1 hPa|
|DELD1 - 8551762 - Delaware City, DE||43 mi||47 min||S 1.9 G 4.1||41°F||45°F||1020.6 hPa|
|RDYD1 - 8551910 - Reedy Point, DE||43 mi||47 min||38°F||48°F||1020.3 hPa|
|JCRN4 - Jacques Cousteau Reserve, NJ||44 mi||95 min||S 6||39°F||1021 hPa||31°F|
Wind History for Philadelphia, PA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Philadelphia, Northeast Philadelphia Airport, PA||6 mi||71 min||N 0||10.00 mi||Fair||39°F||30°F||70%||1021.1 hPa|
|Mount Holly, South Jersey Regional Airport, NJ||10 mi||71 min||N 0||10.00 mi||Fair||35°F||30°F||85%||1020.9 hPa|
|Philadelphia, Philadelphia International Airport, PA||15 mi||71 min||SSW 7||10.00 mi||A Few Clouds||42°F||30°F||65%||1020.7 hPa|
|Philadelphia - Wings Field Airport, PA||16 mi||70 min||N 0||10.00 mi||Fair||32°F||30°F||93%||1020.3 hPa|
|Trenton, Mercer County Airport, NJ||21 mi||72 min||N 0||10.00 mi||Fair||33°F||27°F||78%||1019.7 hPa|
|Mcguire Air Force Base, NJ||22 mi||69 min||SW 6||10.00 mi||Fair||38°F||32°F||79%||1020 hPa|
|Doylestown, Doylestown Airport, PA||23 mi||71 min||SSE 4||10.00 mi||Fair||34°F||28°F||79%||1019.9 hPa|
Wind History from PNE (wind in knots)
|1 day ago||W|
|2 days ago||Calm||Calm||SW||SW||SW||S||S||Calm||S||Calm||Calm||E||S||S|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Pompeston Creek |
Click for Map
Tue -- 03:29 AM EST 6.05 feet High Tide
Tue -- 06:52 AM EST Sunrise
Tue -- 09:22 AM EST Moonrise
Tue -- 10:23 AM EST 0.34 feet Low Tide
Tue -- 03:41 PM EST 6.82 feet High Tide
Tue -- 04:39 PM EST Sunset
Tue -- 07:19 PM EST Moonset
Tue -- 11:03 PM EST 0.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Tue -- 12:09 AM EST 1.00 knots Max Flood
Tue -- 03:33 AM EST -0.00 knots Slack
Tue -- 06:22 AM EST -1.43 knots Max Ebb
Tue -- 06:52 AM EST Sunrise
Tue -- 09:23 AM EST Moonrise
Tue -- 10:33 AM EST 0.00 knots Slack
Tue -- 12:16 PM EST 1.40 knots Max Flood
Tue -- 03:37 PM EST -0.00 knots Slack
Tue -- 04:39 PM EST Sunset
Tue -- 06:22 PM EST -1.43 knots Max Ebb
Tue -- 07:20 PM EST Moonset
Tue -- 11:23 PM EST 0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Mid-Atlantic EDIT
Wind Forecast for Philadelphia/Mount Holly, PA (7,2,3,4)(on/off)  Help
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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.