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Marine Weather and Tides
Version 3.4 |
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 6:18AM | Sunset 7:52PM | Tuesday August 20, 2019 11:50 AM EDT (15:50 UTC) | Moonrise 9:40PM | Moonset 9:53AM | Illumination 75% |  |
ANZ431 Delaware Bay Waters South Of East Point Nj To Slaughter Beach De- 918 Am Edt Tue Aug 20 2019
Rest of today..SE winds 5 to 10 kt. Waves 2 ft or less. A slight chance of showers and tstms late this morning, then a chance of showers and tstms this afternoon.
Tonight..S winds 5 to 10 kt. Waves 2 ft or less. A chance of showers and tstms early in the evening.
Wed..S winds 5 to 10 kt, increasing to 10 to 15 kt late. Waves 2 ft or less, then around 3 ft early in the afternoon.
Wed night..SW winds 10 to 15 kt. Waves around 3 ft. A chance of tstms until early morning. A chance of showers.
Thu..SW winds 5 to 10 kt. Waves 2 ft or less. A chance of showers and tstms.
Thu night..SW winds 5 to 10 kt, becoming nw after midnight. Waves 2 ft or less. A chance of tstms in the evening. Showers likely.
Fri..N winds 5 to 10 kt. Waves around 3 ft in the morning, then 2 ft or less. A chance of showers.
Fri night..N winds 5 to 10 kt. Waves 2 ft or less, then around 3 ft after midnight. A chance of showers.
Sat..NE winds 5 to 10 kt. Waves around 3 ft in the morning, then 2 ft or less. A chance of showers in the morning.
Sat night..E winds around 5 kt. Waves 2 ft or less. Winds and waves higher in and near tstms.
Rest of today..SE winds 5 to 10 kt. Waves 2 ft or less. A slight chance of showers and tstms late this morning, then a chance of showers and tstms this afternoon.
Tonight..S winds 5 to 10 kt. Waves 2 ft or less. A chance of showers and tstms early in the evening.
Wed..S winds 5 to 10 kt, increasing to 10 to 15 kt late. Waves 2 ft or less, then around 3 ft early in the afternoon.
Wed night..SW winds 10 to 15 kt. Waves around 3 ft. A chance of tstms until early morning. A chance of showers.
Thu..SW winds 5 to 10 kt. Waves 2 ft or less. A chance of showers and tstms.
Thu night..SW winds 5 to 10 kt, becoming nw after midnight. Waves 2 ft or less. A chance of tstms in the evening. Showers likely.
Fri..N winds 5 to 10 kt. Waves around 3 ft in the morning, then 2 ft or less. A chance of showers.
Fri night..N winds 5 to 10 kt. Waves 2 ft or less, then around 3 ft after midnight. A chance of showers.
Sat..NE winds 5 to 10 kt. Waves around 3 ft in the morning, then 2 ft or less. A chance of showers in the morning.
Sat night..E winds around 5 kt. Waves 2 ft or less. Winds and waves higher in and near tstms.
ANZ400 918 Am Edt Tue Aug 20 2019
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. A weak cold front will stall near or in the region today before slowly shifting northward as a warm front tonight and Wednesday. A lee surface trough will develop across the area on Wednesday ahead of a slow-moving cold front, which will cross the area Thursday and Thursday night. High pressure will gradually build into the area this weekend into early next week.
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. A weak cold front will stall near or in the region today before slowly shifting northward as a warm front tonight and Wednesday. A lee surface trough will develop across the area on Wednesday ahead of a slow-moving cold front, which will cross the area Thursday and Thursday night. High pressure will gradually build into the area this weekend into early next week.
7 Day Forecast for Marine Location Near Ellendale, DE
Hourly EDIT Helplocation: 38.86, -75.45 debug
Area Discussion for - Philadelphia/Mount Holly, PA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kphi 201325 afdphi area forecast discussion national weather service mount holly nj 925 am edt Tue aug 20 2019 Synopsis A weak cold front will stall near or in the region today before slowly shifting northward as a warm front tonight and Wednesday. A lee surface trough will develop across the area on Wednesday ahead of a slow-moving cold front, which will cross the area Thursday and Thursday night. High pressure will gradually build into the area this weekend into early next week. Near term until 6 pm this evening Only minor adjustments made to the forecast this morning to better reflect the current temperatures and trends. A backdoor cold front dipped down across the area overnight and is expected to stall out across the area through today. The exact placement is to be determined, but most likely across southern new jersey, across northern delmarva, and across southeastern pennsylvania for much of the day. It will likely try to begin drifting back northward later in the afternoon. Several short wave vorticity impulses will move across the area within a weak west to southwest flow aloft which will help lead to a chance of scattered showers and thunderstorms this afternoon. CAPE values will increase to at least 1,500-2,500 j kg across much of the area, especially along and south of the frontal boundary. However, with the weak flow aloft, shear is very minimal, not even reaching 20 knots. However, given the strength of the instability, some strong updrafts will be possible, which could produce some stronger downbursts as well as some hail. With pw values around 1.75-2.00 inches, any thunderstorms will be capable of producing heavy rainfall as they will be efficient rain producers. Any storms will likely be slow moving as well, so there will be the potential for some areas of flooding. Today will be another hot and humid day, although north of the stalled out frontal boundary, dewpoints will likely be a couple of degrees lower then south of the boundary. We have kept the heat advisory for the urban corridor as some areas will approach or exceed 100 degree heat index criteria. Short term 6 pm this evening through 6 am Wednesday The frontal boundary will continue to slowly drift northward overnight tonight, but likely not fully clear the area by daybreak. Multiple short wave vorticity impulses will move across the area within the southwest flow aloft. This will help lead to a chance of showers and thunderstorms through the night. There will also be the chance for patchy fog overnight as well. Long term Wednesday through Monday Main forecast challenges revolve around storm chances through the end of the week. The setup continues to look quite favorable for a couple rounds of storms Wednesday through Friday. Starting with Wednesday, with the backdoor-cold-turned-warm front lifting north into new england, a lee surface trough will become established across the region during the day. Meanwhile, as a potent vort MAX pivots southeastward into the great lakes, a predecessor perturbation will eject east into far southeast canada and new england. Large-scale ascent in advance of this perturbation should become collocated with the prefrontal trough and the downstream warm sector. Numerous storms are expected to develop by afternoon from the northern mid-atlantic northeastward in an environment characterized by 1500+ j kg MLCAPE and increasing deep-layer shear. Our CWA will be on the southern fringe of both the stronger shear and strongest large-scale ascent. Nevertheless, the thermodynamic profiles are suggestive of fairly strong cold pools developing with storms. Given the anticipated coverage of convection, would expect storm organization to increase with time even this far south given the favorable profiles for strong cold pools. Latest convection-allowing model guidance depicts storms congealing into line segments and affecting the northern portions of the CWA by late afternoon evening. This seems reasonable given the setup, though I suspect the model consensus is a little too far north (as organized convection in these regimes tends to develop southward into the reservoir of instability more readily than models project at these time ranges). Given the uncertainty with the southern extent of the strongest convection on Wednesday, did not want to get too specific with threats in the public forecast (yet), and the inherited pop forecast looked quite reasonable. The SPC day-2 convective outlooks maintains a marginal risk for the northern half of the area, with a slight risk touching the far northern portions of the area. Clearly, this will be a period to watch for severe potential. In addition, locally heavy rainfall is a concern given high (1.75+ inch) pws and potential for slow storm motions and or training convection. By 00z Thursday, the aforementioned great lakes shortwave trough will acquire a neutral tilt and begin lifting northeastward. However, an upstream perturbation will dig southeastward into ontario quebec on Thursday. This midlevel evolution should result in strong cyclogenesis northeast of the great lakes Wednesday night and Thursday, with a cold front moving toward the east coast. However, this is where models noticeably diverge. The 00z cmc digs this upstream perturbation into the eastern great lakes and only gradually shifts it eastward Friday and Saturday. This results in relatively little precipitation on Thursday but quite a bit on Friday in our cwa. Meanwhile, the 00z GFS blasts this upstream perturbation through the northeast on Friday, which results in most of the convection occurring on Thursday afternoon evening before the front moves quickly southward by Friday. The 00z ECMWF is somewhat middle-of-the- |
road, though its more nebulous appearance to the upstream perturbation is doubtful. The bottom line is that the forecast for Thursday and Friday is quite unclear. With frontal timing in question and its overall trend appearing to be somewhat slower, I was inclined to keep pops mentionable right through Friday in most of the area, with a gradual trend downward from north to south. I am rather concerned the GFS is much too quick in shunting the front precip southward out of our area for Friday, especially given the positively-tilted and amplifying ridging downstream of the potent shortwave trough in the great lakes. The environment downstream of the front will remain quite unstable, and with a slowing cold front in the mix, locally heavy rainfall is again possible. Temperatures Wednesday and Thursday will remain warm hot, and humidity will be oppressive. Quite confident heat advisory criteria will be met again in the urban corridor, so have extended the advisory through Wednesday. It is not out of the question advisory conditions last into Thursday. As the cold front continues south, Friday should be much cooler. Eventually, high pressure should build into the northeast, bringing an extended period of near-seasonal temperatures and much lower dew points. Models are hinting at prolonged onshore flow by the end of the weekend into next week, suggesting the cooler spell may continue for a while. No complaints! Aviation 13z Tuesday through Saturday The following discussion is for kphl, kpne, kttn, kabe, krdg, kilg, kmiv, kacy and surrounding areas. Today... MainlyVFR conditions will be in place across the area through today. There is a chance of scattered showers and thunderstorms this afternoon, so a prob30 group was added for the afternoon period. If a shower or thunderstorm does occur, it could temporarily lead to lower conditions. Winds will be quite variable for many locations for much of the day as a back door frontal boundary will be stalled out across the area. Any direction will most likely be from the south to southeast, and wind speeds will be 5-10 knots or less. Tonight... Tonight will start outVFR this evening across the area outside of any afternoon evening showers or thunderstorms. However, conditions are forecast to lower overnight as low clouds and or fog are expected to develop during the overnight period. MVFR and ifr conditions can be expected later tonight. There is also a chance for showers and thunderstorms to develop overnight as well. Outlook... Wednesday and Wednesday night... PredominantlyVFR, but sub-vfr conditions in showers storms possible at times, especially from the philly terminals northward. South to southwest winds 5 to 15 kts. Thursday and Thursday night... PredominantlyVFR, but sub-vfr conditions in showers storms possible. Southwest to west winds on Thursday becoming northwest Thursday night, generally around or below 10 kts. Friday and Friday night... Low-confidence forecast, with showers storms possible, especially south of phl. Some restrictions possible if precipitation occurs. Winds generally north to northwest around or below 10 kts. Saturday... MainlyVFR with light north winds. Marine Conditions will remain below advisory levels for today through tonight. There is a chance for scattered showers and thunderstorms which could temporarily lead to locally higher winds and waves. Outlook... Wednesday and Wednesday night... Conditions may approach advisory levels, but are expected to remain generally below wave wind thresholds. A chance of storms, with stronger winds and higher waves possible in their proximity. Thursday through Friday night... Sub-advisory winds seas expected. A chance of storms through the period, with the best chances gradually shifting southward through the period. Saturday... Sub-advisory conditions expected. Cannot rule out showers storms, especially off the delaware coast. Rip currents... with waves forecast at 2-3 foot and a 6-7 second period, along with southerly winds 5-10 knots, the risk for dangerous rip currents is low for today and tonight. Waves in the surf zone will likely remain around 2-3 feet. Phi watches warnings advisories Pa... Heat advisory until 8 pm edt Wednesday for paz070-071-102-104- 106. Nj... Heat advisory until 8 pm edt Wednesday for njz015-017>019. De... Heat advisory until 8 pm edt Wednesday for dez001. Md... None. Marine... None. Synopsis... Cms near term... Robertson meola short term... Robertson long term... Cms aviation... Cms robertson marine... Cms robertson |
Weather Reporting Stations
EDIT (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 |
| DRSD1 - Delaware Reserve, DE | 16 mi | 141 min | NE 1.9 | 83°F | 1019 hPa | 74°F | ||
| LWSD1 - 8557380 - Lewes, DE | 18 mi | 57 min | ENE 5.1 G 7 | 79°F | 73°F | 1019.2 hPa | ||
| BRND1 - 8555889 - Brandywine Shoal Light, DE | 20 mi | 171 min | 1019.2 hPa (+1.2) | |||||
| CMAN4 - 8536110 - Cape May, NJ | 27 mi | 57 min | ENE 7 G 12 | 85°F | 78°F | 1018.6 hPa | ||
| SJSN4 - 8537121 - Ship John Shoal, NJ | 31 mi | 57 min | ESE 8 G 9.9 | 84°F | 84°F | 1020 hPa | ||
| CA2 - 8571892 - Cambridge, MD | 38 mi | 57 min | ENE 7 G 8 | 85°F | 85°F | 1018.6 hPa | ||
| OCIM2 - 8570283 - Ocean City Inlet, MD | 41 mi | 57 min | NE 1.9 G 4.1 | 83°F | 74°F | 1019.7 hPa | ||
| OCSM2 | 41 mi | 171 min | 2 ft | |||||
| 44009 - DELAWARE BAY 26 NM Southeast of Cape May, NJ | 48 mi | 61 min | ENE 3.9 G 5.8 | 81°F | 81°F | 2 ft | 1018.6 hPa (+0.6) | |
| RDYD1 - 8551910 - Reedy Point, DE | 49 mi | 57 min | 84°F | 83°F | 1018.6 hPa | |||
| TCBM2 - 8573364 - Tolchester Beach, MD | 49 mi | 57 min | E 1.9 G 4.1 | 89°F | 85°F | 1019.2 hPa |
Wind History for Lewes, DE
(wind in knots) EDIT (on/off) Help| 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | |
| Last 24hr | S G12 | SE | E | S | S G9 | SW G10 | SW | S | S G8 | SW G9 | SW G10 | SW | SW G7 | SW G6 | W | E | E | E | -- | E | W | E | NE | NE |
| 1 day ago | SE G9 | SE G11 | S G14 | S G12 | SE G12 | SE G12 | S G13 | S G10 | S | SE | S | S | SW | S | S | S | SW G9 | SW | SW | SW | S | SW G7 | S G7 | S G8 |
| 2 days ago | NE | NE | E | E G10 | SE G12 | S G11 | S G11 | SE | S | S | SW G7 | SW | SW | S G7 | S | S | S | SW G8 | SW G7 | SW G7 | SW | S | S | SE G10 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Georgetown - Delaware Coastal Airport, DE | 12 mi | 57 min | ESE 8 | 10.00 mi | Fair | 86°F | 73°F | 67% | 1019 hPa |
| Dover Air Force Base, DE | 19 mi | 1.9 hrs | NE 3 | 10.00 mi | Partly Cloudy | 86°F | 70°F | 61% | 1019.2 hPa |
Link to 5 minute data for KGED
Wind History from GED (wind in knots)
| 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | |
| Last 24hr | SW | S | W | E G19 | SW | SW | Calm | Calm | Calm | SW | Calm | Calm | Calm | Calm | NE | E | ||||||||
| 1 day ago | SE | SE | S | S | S | S | SE | S | S | SE | S | Calm | SW | SW | S | S | S | S | ||||||
| 2 days ago | E | E | E | E | E | S | S | S | S | S | SW | S | S | SW | Calm | S | SW | Calm | Calm | Calm | S |
Tide / Current Tables for Mispillion River entrance, Delaware Bay, Delaware
EDIT Weekend mode (on/off) (on/off) Help One Week of DataMispillion River entrance
Click for Map
Tue -- 12:29 AM EDT 4.89 feet High Tide
Tue -- 06:19 AM EDT Sunrise
Tue -- 07:03 AM EDT 0.53 feet Low Tide
Tue -- 10:52 AM EDT Moonset
Tue -- 12:53 PM EDT 4.74 feet High Tide
Tue -- 07:22 PM EDT 0.69 feet Low Tide
Tue -- 07:49 PM EDT Sunset
Tue -- 10:39 PM EDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 12:29 AM EDT 4.89 feet High Tide
Tue -- 06:19 AM EDT Sunrise
Tue -- 07:03 AM EDT 0.53 feet Low Tide
Tue -- 10:52 AM EDT Moonset
Tue -- 12:53 PM EDT 4.74 feet High Tide
Tue -- 07:22 PM EDT 0.69 feet Low Tide
Tue -- 07:49 PM EDT Sunset
Tue -- 10:39 PM EDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 4.8 | 4.8 | 4.4 | 3.6 | 2.6 | 1.6 | 0.8 | 0.5 | 0.8 | 1.6 | 2.6 | 3.7 | 4.5 | 4.7 | 4.5 | 3.8 | 2.9 | 2 | 1.2 | 0.7 | 0.8 | 1.5 | 2.4 | 3.4 |
Tide / Current Tables for Delaware Bay Entrance, Delaware Current
EDIT (on/off) Help One Week of DataDelaware Bay Entrance
Click for Map
Tue -- 01:31 AM EDT -0.00 knots Slack
Tue -- 04:48 AM EDT -1.22 knots Max Ebb
Tue -- 06:18 AM EDT Sunrise
Tue -- 07:43 AM EDT 0.00 knots Slack
Tue -- 10:45 AM EDT 1.18 knots Max Flood
Tue -- 10:51 AM EDT Moonset
Tue -- 01:55 PM EDT -0.00 knots Slack
Tue -- 05:12 PM EDT -1.06 knots Max Ebb
Tue -- 07:48 PM EDT Sunset
Tue -- 08:01 PM EDT 0.00 knots Slack
Tue -- 10:38 PM EDT Moonrise
Tue -- 11:07 PM EDT 1.12 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 01:31 AM EDT -0.00 knots Slack
Tue -- 04:48 AM EDT -1.22 knots Max Ebb
Tue -- 06:18 AM EDT Sunrise
Tue -- 07:43 AM EDT 0.00 knots Slack
Tue -- 10:45 AM EDT 1.18 knots Max Flood
Tue -- 10:51 AM EDT Moonset
Tue -- 01:55 PM EDT -0.00 knots Slack
Tue -- 05:12 PM EDT -1.06 knots Max Ebb
Tue -- 07:48 PM EDT Sunset
Tue -- 08:01 PM EDT 0.00 knots Slack
Tue -- 10:38 PM EDT Moonrise
Tue -- 11:07 PM EDT 1.12 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 0.8 | 0.3 | -0.3 | -0.8 | -1.1 | -1.2 | -1 | -0.5 | 0.2 | 0.7 | 1.1 | 1.2 | 0.9 | 0.5 | -0 | -0.6 | -0.9 | -1.1 | -1 | -0.6 | -0 | 0.5 | 0.9 | 1.1 |
Weather Map and Satellite Images
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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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Philadelphia/Mount Holly, PA (11,2,3,4)
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Ground Weather Radar Station Dover AFB, DE
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Disclaimer: 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. |