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 6:10AM||Sunset 7:51PM||Tuesday April 24, 2018 8:32 PM EDT (00:32 UTC)||Moonrise 1:12PM||Moonset 2:23AM||Illumination 72%|
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|ANZ430 Delaware Bay Waters North Of East Point Nj To Slaughter Beach De- 634 Pm Edt Tue Apr 24 2018 |
.small craft advisory in effect until 5 am edt Wednesday...
Tonight..E winds 10 to 15 kt with gusts up to 25 kt. Waves around 3 ft. Rain.
Wed..E winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt late in the morning, then diminishing to around 5 kt early in the afternoon, becoming nw late. Waves around 3 ft early in the morning, then 2 ft or less. Patchy fog in the morning. Rain likely early in the morning. A chance of rain late in the morning, then a chance of rain late.
Wed night..NW winds 5 to 10 kt. Waves 2 ft or less. A chance of showers until early morning.
Thu..NW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt late. Waves 2 ft or less.
Thu night..SW winds 5 to 10 kt, becoming S after midnight. Waves 2 ft or less. A chance of showers after midnight.
Fri..SE winds 5 to 10 kt. Waves 2 ft or less. A chance of showers.
Fri night..W winds around 5 kt. Waves 2 ft or less. A chance of showers.
Sat..W winds 5 to 10 kt. Waves 2 ft or less. A chance of showers.
Sat night..W winds 5 to 10 kt, becoming nw 10 to 15 kt after midnight. Waves 2 ft or less. A chance of showers in the evening.
Sun..NW winds 10 to 15 kt. Waves around 3 ft.
Sun night..NW winds 10 to 15 kt. Waves around 3 ft in the evening, then 2 ft or less.
|ANZ400 634 Pm Edt Tue Apr 24 2018 |
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. An area of low pressure over the carolinas this evening will move slowly north overnight, across our area Wednesday into Wednesday night, and then into new england by Thursday. Very weak high pressure will build into the region Thursday, before another low pressure system moves northward across the east coast on Friday. A cold frontal passage is expected Saturday. High pressure will build across the mid atlantic region into early next week.
7 Day Forecast for Marine Location Near Hancocks Bridge, NJHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 242240|
area forecast discussion
national weather service mount holly nj
640 pm edt Tue apr 24 2018
An area of low pressure over the carolinas this evening will move
slowly north overnight, across our area Wednesday into Wednesday
night, and then into new england by Thursday. Very weak high
pressure will build into the region Thursday, before another low
pressure system moves northward across the east coast on Friday. A
cold frontal passage is expected Saturday. High pressure will
build across the mid atlantic region into early next week.
Near term until 6 am Wednesday morning
Latest radar imagery shows edge of rain on the doorstep of
forecast area. Expect leading edge to overspread the region
within the next few hours.
Model guidance has backed off a little on how much moisture
advection we may see. Latest runs show precipitable water values
by late tonight between 1 and 1.2 inches, which remains quite
high for this time of year, but less than what the models were
depicting with earlier runs. None the less, there remains a
potential for locally heavy rain. For the most part, it looks
like the rain amounts will not be enough to cause flooding in
our area. However, in the urban corridor from philadelphia up to
morris county, if the forecasted rain amounts fall in just a
few hours, some flooding is possible in poor drainage areas, so
will continue mention of this in the hwo.
Still see only very limited elevated instability. Thus will not
mention any thunderstorms in the forecast for now.
Overnight, temperatures will stay up higher than what we have
seen the last several nights, thanks to the moisture advection
and persistent cloud cover. Minimum temperatures are forecast to
be in the 40s and 50s.
Short term 6 am Wednesday morning through 6 pm Wednesday
Dry slot should develop in our region tomorrow morning,
bringing a quick end to the widespread rain. Depending on how
much standing water there is by daybreak, we could have some
patchy fog across the region, though it looks like more of a low
stratus set up than fog.
The lull in rain may not last very long as the trailing mid and
upper level trough could result in additional periods of light
rain, generally through the second half of the day tomorrow.
However, thanks to dry air advection moving in, the threat for
heavy rain is very limited tomorrow.
Cloud cover may limit heating somewhat, resulting in highs
generally in the 50s and 60s across the region.
Long term Wednesday night through Tuesday
After a brief period of possible unsettled weather at the
beginning of the period, dry weather takes hold of the forecast
for the rest of the long term forecast.
Although the low pressure system that affects our area during
the day Wednesday lifts to our north Wednesday night, there will
remain a chance of showers on the backside of the low into
Wednesday evening as there remains a couple of vorticity
impulses that will move across the area.
By Thursday, very weak high pressure may briefly affect the
area, leading to dry conditions. However, on Thursday night, an
area of low pressure will be approaching the area from the
southwest. The low itself is not expected to make it across, or
near the area, until during the day Friday, or as late as Friday
evening. There are timing and locations differences with the
low between the guidance. Still, they all indicate an increase
in moisture while several short wave vorticity impulses slide
across the area as well. This will lead to a chance of showers
from late Thursday night through early Friday night, although it
will likely not rain everywhere, nor the whole time.
Once this low lifts to our northeast, it will combine with
another low pressure as it moves out of the great lakes region
and across eastern canada and northern new england. This will
pull a cold front across the area during the day Saturday. This
could bring another chance of showers during the day as the
front moves across the area. Behind this front, drier conditions
return to the forecast.
The low pressure across eastern canada will near the canadian
maritimes through Monday, while high pressure across the great
lakes and ohio valley Sunday will build to our south Monday into
Tuesday. A couple of surface troughs will cross the area during
this time period, but are expected to remain dry. For Sunday
and Monday, there will be a pressure gradient in place between
the high to the south and low to the north, so a steady breeze
with gusts likely in the 20s is expected, with Sunday having the|
Aviation 00z Wednesday through Sunday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
Rest of today... MostlyVFR conditions are expected through the
remainder of the day time today. Lower ceilings and light rain
will start to approach the TAF sites from the south late today.
Winds will stay southeasterly, gradually shifting to easterly,
with gusts near 20 kt likely. High confidence.
Tonight... Ceilings are expected to lower to ifr through the
evening and early morning hours. Localized lifr conditions are
possible. Additionally, visibility in rain, heavy at times,
could be reduced (mostly to MVFR, but occasional ifr
visibilities are possible). Easterly winds around 10 kt are
expected through the overnight hours. Moderate confidence on the
flight category, but low confidence on the timing of changes.
Tomorrow... Though the rain may end at many TAF sites during the
morning, low clouds are expected to linger through the morning.
Improvement to MVFR or evenVFR is possible in the afternoon,
but confidence in improving conditions is low. Winds are
expected to start easterly, but should shift to northwesterly
during the afternoon.
Wednesday night... MVFR conditions possible early with a chance
of showers, before improving overnight.
Thursday...VFR conditions expected.
Thursday night... GenerallyVFR, although MVFR conditions may
begin late in the night across the southern areas as rain
Friday... MVFR, possible ifr, with a chance of scattered
Friday night... MVFR conditions possible early with scattered
showers, becomingVFR during the evening and overnight.
Saturday... MostlyVFR. A chance of showers which may
temporarily lower conditions.
Saturday night-Sunday...VFR. Winds becoming gusty out of the
northwest Sunday morning and may gust 20-25 knots.
Southeasterly and easterly winds gusting above 25 kt are
expected to continue through tonight. By tomorrow morning, winds
may diminish, though seas above 5 feet are expected to continue
on the coastal waters. The small craft advisory remains in
effect until 6 am on the delaware bay, and through the day
tomorrow (and into Thursday) on the coastal waters.
Rain and patchy fog could reduce visibility especially early
Wednesday night-Thursday... Small craft advisory remains as seas
expected to remain over 5-7 feet.
Thursday night-Saturday night... Conditions expected to remain
below advisory levels.
Sunday... Winds may approach small craft advisory levels on
Phi watches warnings advisories
Marine... Small craft advisory until 6 pm edt Thursday for anz450>455.
Small craft advisory until 5 am edt Wednesday for anz430-431.
Synopsis... Robertson 99
near term... Johnson 99
short term... Johnson
long term... Robertson
aviation... Johnson robertson
marine... Johnson robertson
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|
|RDYD1 - 8551910 - Reedy Point, DE||5 mi||45 min||58°F||53°F||1019.4 hPa|
|DELD1 - 8551762 - Delaware City, DE||7 mi||45 min||E 11 G 16||58°F||51°F||1019.9 hPa|
|CHCM2 - 8573927 - Chesapeake City, MD||14 mi||51 min||ENE 4.1 G 8.9||57°F||55°F||1020.1 hPa|
|MRCP1 - 8540433 - Marcus Hook, PA||23 mi||51 min||58°F||53°F||1020.5 hPa|
|DRSD1 - Delaware Reserve, DE||28 mi||123 min||E 5.1||55°F||1020 hPa||52°F|
|PHBP1 - 8545240 - Philadelphia, PA||37 mi||45 min||58°F||50°F||1020.9 hPa|
|TCBM2 - 8573364 - Tolchester Beach, MD||41 mi||45 min||E 7 G 14||54°F||55°F||1019.1 hPa|
|BRND1 - 8555889 - Brandywine Shoal Light, DE||42 mi||51 min||E 21 G 23||54°F||1019.6 hPa|
|BDSP1||42 mi||45 min||58°F||53°F||1021.2 hPa|
|CMAN4 - 8536110 - Cape May, NJ||48 mi||45 min||E 12 G 16||53°F||52°F||1019.2 hPa|
Wind History for Delaware City, DE(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Wilmington, New Castle County Airport, DE||13 mi||42 min||E 12||10.00 mi||Light Rain||58°F||48°F||70%||1020.1 hPa|
Wind History from ILG (wind in knots)
|1 day ago||S||SE||Calm||SW||Calm||W||Calm||Calm||NE||N||Calm||S||E||SE||SE||S|
|2 days ago||SW||W||W||W||NW||NW||NW||Calm||Calm||NW||N||N||E||E||E||Calm||S||S||SE||SE||S||S||S||SE |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Artificial Island |
Click for Map
Tue -- 12:53 AM EDT 0.68 feet Low Tide
Tue -- 03:23 AM EDT Moonset
Tue -- 06:12 AM EDT Sunrise
Tue -- 06:33 AM EDT 6.34 feet High Tide
Tue -- 01:40 PM EDT 0.27 feet Low Tide
Tue -- 02:11 PM EDT Moonrise
Tue -- 07:17 PM EDT 6.11 feet High Tide
Tue -- 07:48 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Chesapeake and Delaware Canal |
Click for Map
Tue -- 02:46 AM EDT 1.81 knots Max Flood
Tue -- 03:24 AM EDT Moonset
Tue -- 05:15 AM EDT -0.08 knots Slack
Tue -- 06:13 AM EDT Sunrise
Tue -- 08:42 AM EDT -2.01 knots Max Ebb
Tue -- 12:30 PM EDT 0.02 knots Slack
Tue -- 02:12 PM EDT Moonrise
Tue -- 03:27 PM EDT 2.14 knots Max Flood
Tue -- 06:50 PM EDT -0.08 knots Slack
Tue -- 07:50 PM EDT Sunset
Tue -- 09:31 PM EDT -1.72 knots Max Ebb
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.
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Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Philadelphia/Mount Holly, PA (20,4,5,8)(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.