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 6:18AM||Sunset 7:47PM||Monday August 21, 2017 11:45 AM EDT (15:45 UTC)||Moonrise 6:00AM||Moonset 7:52PM||Illumination 0%|
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|ANZ431 Delaware Bay Waters South Of East Point Nj To Slaughter Beach De- 912 Am Edt Mon Aug 21 2017 |
Today..S winds around 5 kt, increasing to 10 to 15 kt with gusts up to 20 kt. Waves 2 ft or less, then around 3 ft early this afternoon. Patchy fog early this morning with vsby 1 to 3 nm.
Tonight..S winds 10 to 15 kt with gusts up to 20 kt. Waves around 3 ft until early morning, then 2 ft or less. A chance of showers after midnight.
Tue..S winds 10 to 15 kt with gusts up to 20 kt. Waves around 3 ft early in the morning, then 2 ft or less, then around 3 ft late. A chance of showers early in the morning.
Tue night..SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 3 ft until early morning, then 2 ft or less. A chance of showers late.
Wed..W winds 5 to 10 kt with gusts up to 15 kt. Waves 2 ft or less. A chance of showers.
Wed night..N winds 5 to 10 kt with gusts up to 20 kt. Waves 2 ft or less. A chance of showers in the evening.
Thu..N winds around 10 kt, diminishing to around 5 kt in the afternoon. Waves 2 ft or less.
Thu night..NE winds around 5 kt, becoming N after midnight. Waves 2 ft or less.
Fri..NE winds 5 to 10 kt. Waves 2 ft or less.
Fri night..NE winds 5 to 10 kt. Waves 2 ft or less.
|ANZ400 912 Am Edt Mon Aug 21 2017 |
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. High pressure centered over the coastal mid atlantic will begin to move offshore today. The high will shift farther out to sea on Tuesday while a cold front approaches from the midwest. The cold front is expected to move through the region early Wednesday before possibly stalling nearby to our south Wednesday afternoon and evening. Canadian high pressure building into the region on Thursday will continue to influence our weather through the upcoming weekend.
7 Day Forecast for Marine Location Near Belleplain, NJHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 211315|
area forecast discussion
national weather service mount holly nj
915 am edt Mon aug 21 2017
High pressure centered over the coastal mid atlantic will begin
to move offshore today. The high will shift farther out to sea
on Tuesday while a cold front approaches from the midwest. The
cold front is expected to move through the region early
Wednesday and then stall nearby to our south Wednesday afternoon
and evening. Canadian high pressure building into the region on
Thursday will continue to influence our weather through the
Near term until 6 pm this evening
Only minor updates needed to reflect current temperature and sky
All eyes on the sky today (but hopefully not directly at the sun). A
colleague here said that this was the most important sky cover
forecast of my career. So of course it would not be an easy one.
There are three issues that complicate the forecast of clouds today.
The first, and probably most important, is the developing cumulus
field with diabatic heating. Model soundings and cross sections
indicate increasing low-level moisture through the day and are
strongly suggestive of at least scattered to possibly broken cumulus
by afternoon, especially from the delaware river westward.
Forecasting the extent of this deck of clouds is a challenge (and
unfortunately, rather low-skill, even in the short range). The
latest high-resolution guidance points to a somewhat slower onset of
these clouds, which is obviously good, but has also trended somewhat
denser with the clouds (given somewhat higher moisture content in
the 900-700 mb layer).
In the larger-scale, a low-amplitude vort MAX will be progressing
into pennsylvania today (issue #2), and there will be attendant
ascent just downstream. With smaller-scale lift associated with
orographic effects and differential heating (via sky cover
gradients, e.G.), convection is expected to develop to our west this
afternoon. The timing of convective initiation looks to be early
afternoon, but the placement should be comfortably west of the cwa
(at least at onset). However, with large-scale ascent present, this
may further aid the development of a thicker low-cloud deck, and the
anvils from developing convection may advect rapidly eastward into
eastern pennsylvania. General thinking is that the greatest area of
concern is in the poconos and near reading. There are also some
convection-allowing models (cams) that develop a couple showers this
morning in delmarva, and residual clouds from any showers that
develop here may be a hindrance to eclipse viewing.
Upper-level moisture will also be available, and high cirrus may be
result (issue #3). However, latest model progs suggest a rather thin
layer would be present, and this may be dwindling with time (at
least during the day) given a departing jet streak.
With all of the above in mind, the current sky cover forecast is
fairly optimistic east of the delaware river (generally mostly
sunny), somewhat more pessimistic from the lehigh valley west and
northwest (increasing cloudiness this afternoon) and in between in
delmarva (partly to mostly sunny). Enjoy the show.
Other big concern today is storm chances. The environment is
decently favorable for organized storms capable of isolated strong
to severe wind gusts and hail. MUCAPE will approach exceed 2000 j kg
this afternoon in the far western cwa, and effective shear will be
increasing through the day as the aforementioned vort max
approaches. Cape-shear parameter space will become favorable for
severe storms this afternoon and evening, and cams are suggestive of
scattered, semi-discrete storms developing in the higher terrain of
central pennsylvania moving eastward into the area late this
afternoon. Included mention of gusty winds, hail, and heavy rain
with storms generally west of philadelphia during this period. With
scattered coverage and questions regarding timing, have no more than
chance pops in the grids at the moment.
Forecast temps are a blend of gfs ECMWF nam MOS with a bit of
continuity and cam-based 2-m temperatures added to the blend. It
should feel noticeably more uncomfortable today with increasing
Short term 6 pm this evening through 6 am Tuesday
Main forecast concerns tonight are precipitation chances and
fog stratus development.
Cams are not overly optimistic in maintaining convection after
sunset, and this makes sense given little in the way of surface
support for smaller-scale lift. Nevertheless, the presence of a
passing vort MAX leaves me concerned, especially since these have
been poorly simulated in general this summer. Notably, another vort
max should be moving through northern pennsylvania late tonight, and
may provide glancing ascent to the northern portions of the cwa
during this time. Global coarser models are keeping precipitation
chances around for much of the night in the area, with cams
generally showing little to nothing after 03z. With such disparity,
i find it difficult to remove pops entirely or to elevate them
beyond slight to low-chance during the period. Notably, met MOS pops
went way up with the 00z package, and I have a hard time trending
the opposite direction of statistical guidance.
Meanwhile, some guidance (notably, the nam, as per usual) develops
low clouds and or fog in portions of the area tonight. I am somewhat
skeptical, given that a shortwave trough will be moving through
during the evening early overnight hours. With attendant lift
associated with this and the aforementioned upstream vort max, cloud
cover may be too prevalent to get more than patchy fog in the usual
valley rural spots. The chance for low stratus seems more pronounced
as warm moist advection will be in full swing during the overnight
hours (downstream of a much more potent vort MAX moving into the
great lakes region). Combined with uncertainty regarding
precipitation forecast, only mentioned fog in the lehigh
valley poconos NW nj region for now, though patchy fog certainly
cannot be ruled out elsewhere.
Low temps were a combination of MOS guidance and should be a few
degrees above seasonal averages across the region. It will be muggy
thanks to increased dew points.
Long term Tuesday through Sunday
On Tuesday, a longwave trough associated with an upper low near
james bay is forecast to amplify over the great lakes region as
shortwave energy digs around the backside of the trough. The
surface low will deepen in response to increasing height falls
as it tracks northeastward across ontario and quebec. The
attendant cold front will progress eastward through the midwest.
Looking farther downstream and closer to our area, models show
development of a pre- frontal lee trough over central pa and
potomac highlands during the afternoon hours.
Tuesday will clearly be the hottest of the next 7 days with
forecast highs in lower 90s (except cooler 80s near the coast
and at higher elevations in NE pa NW nj). The humidity will also
be a factor with dewpoints reaching the mid 70s across delmarva
and southern nj and lower 70s just about everywhere else. Peak
heat indices in the upper 90s to near 100f are likely for the
urban i-95 corridor and points south east.
With the expectation that focused lift will remain to our west
near the pre-frontal trough on Tuesday, convection over the
forecast area will likely be disorganized and generally isolated
in coverage (perhaps widely scattered across NE pa where the
terrain could locally enhance lift) during the afternoon.
Slightly better chances for showers and storms arrive Tuesday
evening as convection along this trough propagates eastward into
our area. Pops are highest in our far western zones (west of
the delaware valley and near the eastern shore of md). Showers
and storm are then expected to move eastward into the delaware|
valley and coastal plain at night as the cold front catches up
with the pre-frontal trough and moves into the area. Even though
the environment should be supportive of showers and storms
continuing into the night owing to the arrival of deep synoptic
lift, pops decrease slightly with eastward extent due to some
uncertainty concerning the intensity and coverage of convection
later with the nocturnal boundary layer tending to stabilize
further into the night.
The approach of a low- and mid-level jet ahead of the cold front
will yield increasing shear profiles (0-6 km bulk shear 35-45 kt) by
evening. Additionally, weak to moderate amount of instability
(mlcape 1500 to 2000+ j kg) is forecast to be available to fuel
convective updrafts. Some storms could be strong to severe,
primarily during the afternoon and evening hours, with this
setup. The latest d2 convective outlook from SPC includes the
southern poconos in a slight risk for severe storms with a
marginal risk extending southeastward into the i-95 corridor.
The latest 00z models have trended faster with the cold front as it
moves through eastern pa and nj early Wednesday morning. The front
will then likely slow down when it reaches DELMARVA and perhaps
eventually stall just south of the area across southern va Wednesday
afternoon. Accordingly, it is looking more probable that the
majority of the forecast area dries out on Wednesday, especially
north of the mason-dixon line. While pops were also lowered farther
south, the close proximity to the cold front means that there is
still a chance that showers and storms linger into the day.
Additionally, some of the models (most prominently, the 00z nam)
develop a wave of low pressure along the stationary front in
southeastern va. More organized convection could shift back
northward toward DELMARVA and possible far southern nj by evening.
High pressure over canada and the great lakes region then starts to
build southeastward toward the area on Thursday. This expansive high
will remain in control through the weekend. The end result will be
an extended stretch of pleasant weather Thursday through Sunday.
Highs in the upper 70s lower 80s and and lows ranging from the mid
50s to lower 60s are forecast each day and night, respectively.
While the forecast remains dry for these four days, there looks to
be increasing cloud cover heading into the weekend and potentially a
risk for an isolated shower with 1) the approach of the upper trough
and 2) light onshore flow helping to moisten low-levels over
Aviation 13z Monday through Friday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
Cumulus field will develop during the day, with bases generally
in the 4-6 kft range. Retained prob30 -tsra to krdg kabe given
somewhat increased confidence that convection will move into
eastern pa late this afternoon into the evening hours. Generally
increasing cloud cover from this afternoon through tonight, and
latest guidance shows at least some potential for sub-vfr
cigs vsbys Monday night. Winds generally light variable through
15z, then becoming mostly southerly 5-10 kts.
Tuesday... Early morning fog should dissipate by mid morning, leading
toVFR for most of the day. Showers and storms develop during the
afternoon but current thinking is coverage should initially be
isolated and mainly confined to western terminals (abe rdg).
Tuesday night... Potential for MVFR or ifr restrictions with
slightly higher chances for showers and storms. This activity
should progress to the east-southeast through the night.
Wednesday... Scattered showers and isolated thunderstorms mainly
for terminals S E of phl and earlier in the day. May start off
MVFR with lower CIGS but improvement toVFR is likely from nw
to SE during the day. A wind shift from SW to NW can be expected
early in the day W fropa.
Wednesday night through Friday...VFR and light winds.
Generally tranquil conditions on the waters today, though southerly
winds should pick up this afternoon evening. Speeds should attain 5-
15 kts with gusts to 20 kts or so, especially off the new jersey
coast. Seas will generally range from 2 to 3 feet. There may be some
patchy fog early this morning, but this should dissipate rapidly
Tuesday... SCA was issued for the atlantic coastal waters of nj
and de for late Tuesday afternoon and night. S-sw winds are
expected to strengthen late in the day to 15-25 kt. Isolated
gusts to 30 kt are possible mainly during the evening when the
winds will be strongest. Seas will quickly build in response to
the wind field to 4-6 ft.
Wednesday... A wind shift from SW to w-nw should occur on
Wednesday behind a cold front. Winds will also decrease as well.
There is still a possibility that the SCA may need to be
extended into Wednesday morning if seas take a bit longer to
subside below 5 ft.
Thursday and Friday... Winds and seas below SCA criteria.
the rip current risk has been upgraded to moderate for today,
mainly from late this afternoon through this evening, when a
longer-period swell develops (around 9-10 seconds), seas begin
to increase, and southerly winds increase to around 15 kts with
higher gusts. The combination of the above factors and the
presence of a new moon suggests the rip current risk will be
increasing through the day. As such, felt best to raise the risk
Tides coastal flooding
Based on observations yesterday evening and current projections
for the high tide this evening, will hold off on issuing a
coastal flood advisory this morning. Current model projections
continue to indicate levels reaching near minor flood thresholds
but consistently below advisory thresholds. Spotty minor
flooding is probable this evening, but confidence is too low at
this point to issue an advisory. Nonetheless, there is some
concern that a more onshore component of the wind (south to
possibly south-southeast) may contribute to somewhat higher
levels than guidance suggests this evening. Should this be
observed during the day, the threat for minor flooding would
Phi watches warnings advisories
Marine... Small craft advisory from 3 pm Tuesday to 6 am edt Wednesday
near term... Cms di spigna
short term... Cms
long term... Klein
aviation... Cms klein
marine... Cms klein tides coastal
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|
|CMAN4 - 8536110 - Cape May, NJ||17 mi||45 min||S 8.9 G 11||77°F||77°F||1023.1 hPa (+0.4)|
|BRND1 - 8555889 - Brandywine Shoal Light, DE||19 mi||45 min||S 8.9 G 9.9||76°F||1023.7 hPa (+0.0)|
|SJSN4 - 8537121 - Ship John Shoal, NJ||26 mi||45 min||SSE 12 G 13||79°F||80°F||1022.8 hPa|
|ACYN4 - 8534720 - Atlantic City, NJ||27 mi||45 min||77°F||74°F||1023.7 hPa (+0.0)|
|JCRN4 - Jacques Cousteau Reserve, NJ||32 mi||75 min||S 2.9||81°F||1023 hPa||64°F|
|LWSD1 - 8557380 - Lewes, DE||32 mi||45 min||SSW 5.1 G 8||81°F||78°F||1023.1 hPa (+0.0)|
|RDYD1 - 8551910 - Reedy Point, DE||43 mi||45 min||83°F||81°F||1022.6 hPa (-0.0)|
|DELD1 - 8551762 - Delaware City, DE||45 mi||45 min||S 4.1 G 8||82°F||77°F||1023 hPa (-0.0)|
Wind History for Cape May, NJ(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Wildwood, Cape May County Airport, NJ||14 mi||50 min||S 6||10.00 mi||Mostly Cloudy||82°F||68°F||63%||1024.1 hPa|
|Millville, Millville Municipal Airport, NJ||14 mi||51 min||Var 4||10.00 mi||Fair||84°F||70°F||63%||1022.9 hPa|
Wind History from WWD (wind in knots)
|1 day ago||Calm||W||NW||NW||W||W||W||SW||S||SW||W||W||NW||Calm||NW||W||NW||NW||NW||N||N||NW|
|2 days ago||S||S||S||S||S|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|East Creek |
Click for Map
Mon -- 05:06 AM EDT -0.17 feet Low Tide
Mon -- 06:00 AM EDT Moonrise
Mon -- 06:18 AM EDT Sunrise
Mon -- 10:42 AM EDT 4.27 feet High Tide
Mon -- 02:31 PM EDT New Moon
Mon -- 05:09 PM EDT -0.24 feet Low Tide
Mon -- 07:46 PM EDT Sunset
Mon -- 07:52 PM EDT Moonset
Mon -- 11:06 PM EDT 5.20 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Bidwell Creek entrance |
Click for Map
Mon -- 03:29 AM EDT -0.33 feet Low Tide
Mon -- 06:00 AM EDT Moonrise
Mon -- 06:18 AM EDT Sunrise
Mon -- 09:12 AM EDT 6.29 feet High Tide
Mon -- 02:31 PM EDT New Moon
Mon -- 03:32 PM EDT -0.44 feet Low Tide
Mon -- 07:46 PM EDT Sunset
Mon -- 07:51 PM EDT Moonset
Mon -- 09:34 PM EDT 7.56 feet High Tide
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 (11,2,3,4)(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.