Marine Weather and Tides
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.
|Sunrise 7:06AM||Sunset 7:14PM||Sunday March 18, 2018 7:16 PM EDT (23:16 UTC)||Moonrise 6:59AM||Moonset 7:28PM||Illumination 5%|
EDIT (on/off)  Help
|ANZ455 Coastal Waters From Cape May Nj To Cape Henlopen De Out 20 Nm- Coastal Waters From Cape Henlopen To Fenwick Island De Out 20 Nm- 641 Pm Edt Sun Mar 18 2018 |
.gale watch in effect from Tuesday morning through late Tuesday night...
Tonight..NW winds 10 to 15 kt, becoming sw this evening, then increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 ft or less, then around 3 ft late this evening and early morning, then 2 ft or less late. SWell mainly from the E with a dominant period of 5 seconds.
Mon..W winds 10 to 15 kt with gusts up to 20 kt, becoming N late in the morning, then becoming ne in the afternoon. Seas 2 ft or less. SWell mainly from the se with a dominant period of 4 seconds.
Mon night..E winds 5 to 10 kt, increasing to 15 to 20 kt with gusts up to 25 kt. Seas 2 ft or less, then 3 to 5 ft in the late evening and overnight. SWell mainly from the se with a dominant period of 9 seconds. A chance of rain late in the evening. Rain after midnight. Vsby 1 to 3 nm in the late evening and overnight.
Tue..E winds 20 to 25 kt, becoming ne 25 to 30 kt in the late morning and afternoon. Gusts up to 45 kt. Seas 4 to 7 ft, building to 8 to 11 ft in the late morning and afternoon. SWell mainly from the N with a dominant period of 5 seconds. Rain until late afternoon. Snow and sleet late in the morning. A chance of rain late. Vsby 1 to 3 nm in the morning.
Tue night..NE winds 25 to 30 kt with gusts up to 45 kt. Seas 8 to 11 ft. A chance of rain, snow and sleet in the evening, then rain, snow and sleet likely after midnight. Vsby 1 to 3 nm.
Wed..NE winds 25 to 30 kt, becoming N 20 to 25 kt in the afternoon. Gusts up to 45 kt. Seas 8 to 11 ft. Rain, snow and sleet likely in the morning, then rain likely in the afternoon. Vsby 1 to 3 nm in the morning.
Wed night..N winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 6 to 9 ft. A chance of snow. Vsby 1 to 3 nm.
Thu..NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 4 to 7 ft.
Thu night..NW winds 10 to 15 kt. Seas 4 to 6 ft.
Fri..NW winds 10 to 15 kt. Seas 3 to 5 ft.
Fri night..NW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 3 ft.
|ANZ400 641 Pm Edt Sun Mar 18 2018 |
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. High pressure over the midwest will gradually track to the south and east tonight and then will move off the mid-atlantic coast by Monday evening. Canadian high pressure then re-establishes itself north of the great lakes. Meanwhile, a complex area of low pressure will move east emerging over the mid-atlantic Monday night into Tuesday. This system may linger off the coast through Wednesday before moving off to the north and east by Thursday. High pressure returns from the north to close out the work week. Low pressure then approaches next weekend.
7 Day Forecast for Marine Location Near Millsboro, DEHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 182013|
area forecast discussion
national weather service mount holly nj
413 pm edt Sun mar 18 2018
High pressure over the midwest will gradually track to the
south and east tonight and then will move off the mid-atlantic
coast by Monday evening. Canadian high pressure then re-
establishes itself north of the great lakes. Meanwhile, a
complex area of low pressure will move east emerging over the
mid-atlantic Monday night into Tuesday. This system may linger
off the coast through Wednesday before moving off to the north
and east by Thursday. High pressure returns from the north to
close out the work week. Low pressure then approaches next
Near term until 6 am Monday morning
Quiet conditions expected overnight tonight across the area.
High pressure builds to the south of the area through tonight,
while a weak area of low pressure pushes a backdoor cold front
across the area. This back door cold front will be a dry frontal
passage, and not bring any precipitation. It likely will not
bring much cloud cover with it either, except across the far
northern portions of the area. Winds will become light and
variable, and another night of below normal temperatures is
Short term 6 am Monday morning through 6 pm Monday
Quiet conditions continue through the daytime hours Monday as
high pressure noses in from the north, then builds offshore
during the day and keeps dry weather in the forecast. Clouds are
expected to increase from south to north late in the day in
advance of the next approaching system, but no precipitation is
expected during the daylight hours. Highs on Monday are expected
to remain below normal.
Long term Monday night through Sunday
Coastal storm on track to impact the region Monday night through
Tuesday, and then a secondary coastal storm will impact the
region Tuesday night and Wednesday.
Models are coming into better agreement in terms of timing and
placement of the upcoming storm system, but there remain
differences which keep this a low confidence forecast.
Low pressure emerges southwest of the DELMARVA peninsula
Tuesday morning, and tracks just offshore by Tuesday evening
before stalling off the mid-atlantic coast. An upper trough then
follows behind it Tuesday night and Wednesday, and then the low
re-intensifies on Wednesday just offshore before lifting to the
north and east and towards the canadian maritimes Wednesday
Models continue to indicate a fairly sharp cutoff with how far
north the precip gets. GFS keeps pretty much all of the area
north of i-195 dry Tuesday and Wednesday with the passage of
both systems. The ECMWF is a bit farther north with the extent
of the heavier precip, but generally keeps the southern poconos
dry. The NAM is similar to the GFS in terms of the cutoff. The
canadian is similar to the ECMWF in terms of placement of the
qpf, but is much wetter. As a result, capped pops at slight
chance for far northern zones, and otherwise slight chance low-
end chance for areas generally north of i-195.
For the rest of the region, pops ramp up to likely categorical
for the DELMARVA and southern nj Monday night and Tuesday, and
likely pops for Tuesday night and Wednesday with the passage of
the secondary low.
Ptype remains an issue. For area north of i-195, where pops are
the lowest, temperatures and thermal profiles will remain cold
enough to support all snow. But with the bulk of the precip
staying to the south, not expecting much more than an inch or
two with the two systems.
For southern portions of the DELMARVA and into extreme southeast
nj, there will be enough of an onshore flow to keep temperatures
warm enough to support at least a mix, and snow mainly at night.
This keeps accumulations down to less than an inch for the
coast, and maybe 1-2" inland.
The big question lies for the i-95 corridor, from generally
trenton to wilmington, and then south towards georgetown. At
night, temperatures will be cold enough for all snow. But the
heaviest of the precip falls during the day. And during the day,
there should be a wintry mix of snow, sleet, and rain. This
keeps accumulation down, even with the passage of the secondary
storm on Wednesday. For this area, generally going with 1-3",
but there may be some spotty areas of up to 4".
After running the snow probability graphics, the high-end has
come down from this morning, and now there is generally the
potential for 5-7".
A winter storm watch is not necessary at this time for this
event, but there is the potential a winter weather advisory may
be needed if these accumulations hold.
In addition to the precip, strong northeast winds develop on
Tuesday, generally 15-20 mph with gusts up to 30 mph, and
stronger right along the coast. These winds continue into
Wednesday, and may even strengthen a bit.
Behind the departing system, winds turn to the northwest on
Thursday. High pressure builds in from the north and west.
Temperatures will be well below normal levels through this week.
Yet another storm system is gearing to make a run at us next
weekend, but it is way too soon to determine impacts at this
Aviation 20z Sunday through Friday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
Tonight...VFR conditions continue tonight. Northwest winds
diminish after sunset and become light and variable for most
Monday...VFR conditions continue, although clouds increase from
south to north during the day. Light and variable winds early
become northwest, then northeast during the day, with speeds
around 5-10 knots.
Monday night and Tuesday... Onset of precip still looks to be
late evening over the DELMARVA as rain. By late Monday night and
Tuesday morning, widespread MVFR ifr conditions likely from
kphl kpne southward. There is high uncertainty as you go
farther north toward abe regarding if snow will make it that
far north with a sharp cutoff in precip expected. For miv and
acy, a considerable amount of mixing of rain, snow and perhaps
sleet is likely while snow is favored farther northward toward
phl. NE winds 10-20 kt with gusts 25-35 kt (higher end of range
near the coast). Moderate confidence.
Tuesday night through Wednesday night... Additional precip is
possible, mainly snow (except along the coast). Confidence in
precip occurring is moderate near the coast and decreases
farther inland. MVFR or ifr conditions would be possible if snow
reaches the terminals but confidence is low at this point.
Gusty n-ne winds expected, especially near the coast.
Thursday...VFR. NW winds gradually relax. High confidence.
Friday...VFR. NW winds. Moderate confidence.
Conditions expected to remain below advisory levels for tonight
through Monday, although winds may gust around 20 knots at
Monday night through Tuesday night... A gale watch is now in
effect for the northernmost nj ocean waters Tuesday night, and a
gale watch remains in effect for all other ocean waters for
Tuesday and Tuesday night. The strongest winds are expected over
southern ocean waters where gusts could reach 40-45 kt. Wave
heights in our southern coastal waters are forecast to build to
8-12 ft and to 6 to 10 ft for northern coastal ocean waters by
late Tuesday. Conditions should remain below gale on de bay, but
gusts to 35 kt are possible at the mouth of lower de bay.
Wednesday... The potential for gales exists but it speeds will
depend on how close a second coastal low tracks to our area and
how fast it deepens which is still uncertain. Adjusted wave
heights 2 to 3 feet above wavewatch guidance with the potential
for northeasterly gales to continue.
Wednesday night and Thursday... SCA conditions likely.
Friday... Sub-sca conditions expected.
Tides coastal flooding
An extended period of strong northeasterly winds are expected
to occur from late Monday night through Wednesday with two
coastal storms tracking south and east of the region. Positive
tidal anomalies will increase with each successive high tide as
water piles up along the coast. The threat for coastal flooding
looks to develop as early as the Tuesday evening high tide along
the nj-de coast and continue through the Wednesday night high
The degree of coastal flooding will depend on the track and
strength of both coastal lows, which is still uncertain
especially with with the second one Tuesday night into
Wednesday. Etss, estofs and other tidal prediction guidance from
stevens flood advisory system indicate minor to possibly low-
end moderate coastal flooding is most likely.
Phi watches warnings advisories
Marine... Gale watch from Tuesday morning through late Tuesday night for
Gale watch from Tuesday evening through late Tuesday night for
near term... Robertson
short term... Robertson
long term... Mps
aviation... Robertson mps
marine... Robertson mps
tides coastal flooding...
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|
|LWSD1 - 8557380 - Lewes, DE||16 mi||47 min||N 1.9 G 2.9||46°F||41°F||1013.6 hPa|
|OCIM2 - 8570283 - Ocean City Inlet, MD||21 mi||47 min||SSW 9.9 G 12||42°F||44°F||1014.8 hPa|
|BRND1 - 8555889 - Brandywine Shoal Light, DE||29 mi||47 min||N 6 G 8||47°F||1013.8 hPa|
|CMAN4 - 8536110 - Cape May, NJ||32 mi||47 min||NW 5.1 G 8.9||46°F||42°F||1012.9 hPa|
|44009 - DELAWARE BAY 26 NM Southeast of Cape May, NJ||33 mi||87 min||N 5.8 G 7.8||43°F||41°F||3 ft||1014 hPa (-0.8)||29°F|
|DRSD1 - Delaware Reserve, DE||35 mi||107 min||N 4.1||51°F||1013 hPa||17°F|
|CA2 - 8571892 - Cambridge, MD||41 mi||47 min||53°F||43°F||1014.4 hPa|
|BISM2 - 8571421 - Bishops Head, MD||47 mi||47 min||S 4.1 G 5.1||50°F||46°F||1014.3 hPa|
Wind History for Lewes, DE(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Georgetown - Delaware Coastal Airport, DE||8 mi||23 min||ENE 5||10.00 mi||Fair||47°F||21°F||37%||1013.8 hPa|
|Salisbury, Salisbury-Ocean City Wicomico County Regional Airport, MD||20 mi||23 min||Var 5||10.00 mi||Fair||46°F||28°F||51%||1014.3 hPa|
|Ocean City, Ocean City Municipal Airport, MD||22 mi||24 min||S 5||10.00 mi||Fair||41°F||30°F||65%||1014.7 hPa|
Wind History from GED (wind in knots)
|1 day ago||NW|
|2 days ago||NW||Calm||Calm||Calm||Calm||W||SW||SW||W||SW||W||W||W||W||NW|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Possum Point |
Click for Map
Sun -- 12:06 AM EDT 1.07 feet High Tide
Sun -- 07:07 AM EDT Sunrise
Sun -- 07:15 AM EDT -0.09 feet Low Tide
Sun -- 07:59 AM EDT Moonrise
Sun -- 12:31 PM EDT 1.12 feet High Tide
Sun -- 07:11 PM EDT Sunset
Sun -- 07:37 PM EDT -0.04 feet Low Tide
Sun -- 08:28 PM EDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Delaware Bay Entrance |
Click for Map
Sun -- 02:41 AM EDT -1.46 knots Max Ebb
Sun -- 05:22 AM EDT 0.00 knots Slack
Sun -- 07:06 AM EDT Sunrise
Sun -- 07:58 AM EDT Moonrise
Sun -- 08:23 AM EDT 1.55 knots Max Flood
Sun -- 11:34 AM EDT -0.00 knots Slack
Sun -- 03:00 PM EDT -1.54 knots Max Ebb
Sun -- 05:43 PM EDT 0.00 knots Slack
Sun -- 07:10 PM EDT Sunset
Sun -- 08:27 PM EDT Moonset
Sun -- 08:42 PM EDT 1.56 knots Max Flood
Sun -- 11:54 PM EDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES Local Image of Mid-Atlantic 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.
target = "new">Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Philadelphia/Mount Holly, PA (19,4,5,8)(on/off)  Help
Ad by Google
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.