Monday, March30, 2020
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Marine Weather and Tides
Delaware City, DE

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:47AMSunset 7:26PM Monday March 30, 2020 12:01 AM EDT (04:01 UTC) Moonrise 9:24AMMoonset 12:00AM Illumination 35% Phase: Waxing Crescent; Moon at 6 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- 1005 Pm Edt Sun Mar 29 2020
Overnight..W winds around 5 kt. Waves 2 ft or less. Isolated tstms late this evening.
Mon..W winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves 2 ft or less.
Mon night..NW winds 10 to 15 kt. Gusts up to 20 kt early in the evening, then 20 kt after midnight. Waves 2 ft or less, then around 3 ft early in the evening, then 2 ft or less late in the evening, then around 3 ft after midnight.
Tue..NW winds around 10 kt, becoming E in the afternoon. Waves 2 ft or less.
Tue night..E winds 10 to 15 kt with gusts up to 20 kt. Waves 2 ft or less, then around 3 ft after midnight. A chance of rain.
Wed..NE winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Gusts up to 20 kt. Waves around 3 ft in the morning, then 2 ft or less. A chance of rain in the morning.
Wed night..NW winds 5 to 10 kt. Waves 2 ft or less.
Thu..NW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 ft or less.
Thu night..NW winds 10 to 15 kt. Waves 2 ft or less.
Fri..N winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Gusts up to 20 kt. Waves 2 ft or less.
Fri night..NE winds 5 to 10 kt. Waves 2 ft or less. Winds and waves higher in and near tstms.
ANZ400 1005 Pm Edt Sun Mar 29 2020
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. A warm front moving through the northern mid-atlantic from south to north will be shunted offshore as a cold front sweeps through the region tonight. A reinforcing front will progress through the area tomorrow. A surface low in the southeast on Tuesday morning will shift east-northeast off the carolina coast by Wednesday morning. High pressure will build into the northeast to close the week. A weak system may affect the area during the weekend.


7 Day Forecast for Marine Location Near Delaware City, DE
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location: 39.57, -75.59     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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FXUS61 KPHI 300002 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 802 PM EDT Sun Mar 29 2020

SYNOPSIS. A warm front moving through the northern Mid-Atlantic from south to north will be shunted offshore as a cold front sweeps through the region tonight. A reinforcing front will progress through the area tomorrow. A surface low in the Southeast on Tuesday morning will shift east-northeast off the Carolina coast by Wednesday morning. High pressure will build into the Northeast to close the week. A weak system may affect the area during the weekend.

NEAR TERM /THROUGH MONDAY/. The warm front got hung up in central Delaware before a bay breeze boundary acted as a barrier and stopped the northward transition of warmer air. As such the stratus is had held on longer than initially forecast which has largely limited any threat of thunderstorms. The stratus should slowly erode through the rest of the night but slower than much the guidance was initially projection. With the absence of the dry air move in during the daylight, now when the clouds to thin out we've seen the low level moisture fog in many areas so I've expanded the areal coverage of patchy fog in the forecast. Temps were in the ball park but I used some of the latest rapid refresh guidance blended into a persistence forecast for the next couple of hours.

Previous discussion . A warm front is slowly but surely lifting north this afternoon toward the forecast area as the parent surface low passes across the Great lakes region. The resulting edge of the eroding stratus has just made it to southern Delaware as of 3 PM and much of Delmarva should clear out through the reminder of the afternoon and into the evening. North of the warm front, temps will continue to hover around 50 degrees along with overcast skies. Well to our west across western PA, Ohio, and West Virginia, a well developed cumulus field exists with convection beginning to fire up toward the north where the better forcing aloft resides.

A pseudo cold/occluded front will pass across the area into the overnight. Guidance differs as to the evolution of this feature since the exact location of the warm front is still uncertain. For example, the NAM advects drier air just above the surface but leaves a very shallow low-level moist stable layer. This does make sense meteorologically though given the occluded nature of the front and lack of any real cold air advection immediately in its wake. If this is the result, we may have some patchy fog, but opted to leave this out of the forecast for now. Expect low temperatures within a few degrees of 50 along with light and variable winds becoming more westerly toward daybreak.

SHORT TERM /MONDAY NIGHT/. After any lingering shallow stable layer and/or fog mixes out during the morning, forecast soundings indicate that the boundary layer will become well mixed by the afternoon up to around the 800 mb layer. This along with westerly 925 mb winds of 25-30 kts will result in a rather breezy day with winds gusting up to around 30-35 mph. Otherwise, temperatures are forecast to warm nicely into the 60s as cold air advection will be lagging behind the departing system. Across eastern PA and northern NJ, scattered showers are possible throughout the day as a shortwave trough passes across the area. The shortwave will also usher in a deck of mid-level clouds resulting in mostly cloudy skies through much of the day especially, from the I-95 corridor and north/west.

As the boundary layer stabilizes toward sunset, the winds will die down fairly quickly and temperatures will fall into the low 40s overnight. A few lingering showers will still be possible across northern NJ and easter central PA through the overnight as well as yet another shortwave trough passes. This will also keep the mid- level cloudiness locked in basically everywhere except Delmarva.

LONG TERM /TUESDAY THROUGH SUNDAY/. The medium-range period looks rather benign, with the main forecast challenges being precipitation chances on Tuesday and Wednesday.

A weak perturbation on the western periphery of a larger midlevel vortex off the Northeast coast at 12z Tuesday will likely provide sufficient lift to generate some showers in the northern CWA Tuesday. The signal is strong enough with the deterministic models to introduce more widespread coverage of chance PoPs generally north of the Philadelphia area. The showers may linger into at least the afternoon, as the perturbation will move little as it interacts with the larger- scale vortex offshore as well as an approaching southern-stream perturbation moving into the Southeast. Eventually, the perturbation will shear apart as the stronger perturbation to the southwest approaches the Carolina coast Tuesday evening. With large-scale ascent weakening (primarily being shunted southward), any lingering showers should wane by Tuesday evening. Meanwhile, a precipitation shield on the north side of the attendant surface low moving off the coast late in the night will approach the southern fringe of the CWA. Models have trended farther south with this shield today, indicating a stronger influence of high pressure to the north. Given the strength of the midlevel vortex to the north and surface high pressure upstream, would not be surprised if virtually all precipitation with this southern-stream system remains out of our forecast area. Lowered PoPs slightly but did not remove entirely given continued model variability run to run. Any precipitation with this system looks increasingly like it will remain confined to Delmarva and far southern New Jersey.

With considerable cloudiness and showers across the area on Tuesday, highs will be several degrees below average, but lows Tuesday night should remain near average. Given the stronger influence of the surface high to the north on Wednesday (as well as cool onshore flow), somewhat more confident that temperatures will remain below average. Lowered highs several degrees Wednesday (roughly 5 to 10 degrees below seasonal averages and similar to Tuesday's values).

On the upstream side of the southern-stream system, high pressure will build into the area to close the week. Though cold advection will occur through Thursday night, decreased cloudiness and mixing combined with some downsloping will allow temperatures to increase closer to seasonal averages Thursday afternoon. Winds may be somewhat gusty during the day (25 to 35 mph possible), given the increased pressure gradient between the departing low and the approaching surface high. Friday will be similar to Thursday, but with lighter winds as the surface ridge axis moves closer to the region.

Models continue to differ regarding the approach of a weak front the following weekend, but they have trended noticeably slower, likely owing to blocking downstream. Given that large-scale ascent will be displaced well northwest of the area, any precipitation with the front looks rather light and sparse in coverage at this point. Kept PoPs fairly low and temperatures close to seasonal through Sunday.

AVIATION /00Z MONDAY THROUGH FRIDAY/. The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Overnight . IFR or LIFR ceilings will generally start to improve after 06z however with significant low level moisture trapped below the inversion anticipate MVFR/IFR visibilities to persist through much of the overnight hours in patchy fog. Ceilings and flight conditions should improve at some point overnight towards daybreak to VFR.

Monday . VFR ceilings generally between 4000-8000 feet. Light and variable winds becoming west-southwest 5-10 knots around 12z, then west-northwest 10-15 knots with gusts up to 25 knots from about 15z onward. Moderate confidence.

Outlook . Monday night and Tuesday . Mainly VFR, though some showers may occur (especially north of PHL) with sub-VFR CIGs possible at times. Northwest winds Monday night becoming northeast or east on Tuesday with speeds generally around or below 10 kt. Moderate confidence.

Tuesday night and Wednesday . Sub-VFR possible with a chance of rain, especially south of PHL. East to northeast winds gradually becoming more northerly on Wednesday. Speeds generally 5 to 15 kt. Low confidence.

Wednesday night through Friday . Mainly VFR. Northwest winds 5 to 15 kt Wednesday night increasing to 10 to 20 kt with higher gusts on Thursday, diminishing again on Thursday night. Directions may become more northerly or northeasterly on Friday, but speeds should be lower than Thursday. Moderate confidence.

MARINE. Seas will remain elevated around 5 feet across the northern-most ocean zones through the overnight so will leave the SCA as is. Some lingering patchy fog is still possible as well across all waters through the overnight, however no more dense fog is expected. Winds will remain largely light and variable overnight.

On Monday, offshore winds will increase to around 15 kts during the day. Expect seas of 3-4 feet.

Monday night . Sub-SCA conditions expected with seas 3-4 feet and westerly winds around 15 kts.

Outlook . Tuesday . Sub-advisory winds/seas expected.

Tuesday night and Wednesday . Increasing northeast winds 15 to 25 kt with gusts to 30 kt (especially off the Delaware coast). Seas may build to 5 to 7 feet by Wednesday before beginning to subside in the late afternoon. A chance of rain, primarily off the Delaware coast.

Wednesday night . Any lingering high seas should drop below 5 feet by Thursday morning.

Thursday through Friday . Northwest winds may approach advisory criteria at times, but general sub-advisory conditions expected.

PHI WATCHES/WARNINGS/ADVISORIES. PA . None. NJ . None. DE . None. MD . None. MARINE . Small Craft Advisory until 6 AM EDT Monday for ANZ450>452.

Synopsis . CMS Near Term . CMS/Deal/Staarmann Short Term . Staarmann Long Term . CMS Aviation . CMS/Gorse Marine . CMS/Staarmann


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RDYD1 - 8551910 - Reedy Point, DE 1 mi62 min 51°F 51°F1010.2 hPa (+1.0)
DELD1 - 8551762 - Delaware City, DE 1 mi62 min NNE 7 G 8 51°F 55°F1010.7 hPa (+0.9)
CHCM2 - 8573927 - Chesapeake City, MD 12 mi62 min ENE 4.1 G 4.1 52°F 51°F1010.9 hPa (+0.9)
MRCP1 - 8540433 - Marcus Hook, PA 19 mi62 min 51°F 52°F1010.5 hPa (+0.5)
SJSN4 - 8537121 - Ship John Shoal, NJ 22 mi62 min NNE 8 G 9.9 52°F 1010.6 hPa (+0.5)
PHBP1 - 8545240 - Philadelphia, PA 35 mi62 min 49°F 50°F1010.7 hPa (+0.6)
BDSP1 39 mi62 min 48°F 1011.3 hPa (+0.4)
BRND1 - 8555889 - Brandywine Shoal Light, DE 48 mi68 min NE 8 G 9.9 1010.9 hPa

Wind History for Delaware City, DE
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wilmington, New Castle County Airport, DE8 mi71 minNNE 71.25 miFog/Mist52°F50°F93%1010.9 hPa

Link to 5 minute data for KILG

Wind History from ILG (wind in knots)
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Last 24hrN9N9N8NE9NE7NE11NE10NE11E7E6NE8E5N4E10CalmN3E4E6NE6NE7N8NE7NE7N5
1 day agoW3CalmCalmE5E5N4CalmE3S4SE9E11E12E10E10NE7E5NE8NE8NE8N8N7E63N8
2 days agoS5SE4SE5S5S3CalmCalmNW6W8NW4NW8N9N6NW12NW9NW9NW10
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Tide / Current Tables for Delaware City Branch Channel bridge, Delaware River, Delaware
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Chesapeake and Delaware Canal, Maryland/Delaware Current
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Chesapeake and Delaware Canal
Click for Map
Mon -- 12:34 AM EDT     Moonset
Mon -- 01:47 AM EDT     -0.03 knots Slack
Mon -- 05:18 AM EDT     -2.10 knots Max Ebb
Mon -- 06:49 AM EDT     Sunrise
Mon -- 08:36 AM EDT     0.08 knots Slack
Mon -- 10:25 AM EDT     Moonrise
Mon -- 12:29 PM EDT     2.04 knots Max Flood
Mon -- 03:23 PM EDT     -0.04 knots Slack
Mon -- 06:02 PM EDT     -1.46 knots Max Ebb
Mon -- 07:25 PM EDT     Sunset
Mon -- 08:23 PM EDT     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.3-0.7-1.6-1.9-2.1-2-1.7-10.81.41.7221.60.8-0.9-1.3-1.5-1.3-0.70.81.21.4

Weather Map
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wmap_A
GEOS 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.
Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Philadelphia/Mount Holly, PA (0,6,7,8)
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Ground Weather Radar Station Dover AFB, DE
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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 numerous 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.