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Marine Weather and Tides
Version 3.4 |
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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. |
| Sunrise 5:50AM | Sunset 8:28PM | Thursday July 19, 2018 2:06 AM EDT (06:06 UTC) | Moonrise 12:14PM | Moonset 11:54PM | Illumination 37% |  |
Marine Forecasts
EDIT (on/off) Help| ANZ530 Chesapeake Bay North Of Pooles Island- 132 Am Edt Thu Jul 19 2018 Overnight..N winds 5 kt. Waves less than 1 ft. Thu..NE winds 5 kt. Waves less than 1 ft. Thu night..SE winds around 5 kt. Waves flat. Fri..SE winds 5 to 10 kt. Waves 1 ft or less. Fri night..E winds 5 to 10 kt. Waves 1 ft. Sat..E winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. Sat night..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers. Sun..SE winds 5 kt. Waves less than 1 ft. Showers likely. Mon..S winds 5 to 10 kt. Waves 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms. | ANZ500 132 Am Edt Thu Jul 19 2018 Synopsis for the tidal potomac and md portion of the chesapeake bay.. Canadian high pressure will dominate over the waters through Thursday before shifting off the new england coast on Friday. A low pressure system will approach from the west over the weekend, and a weak area of low pressure may move near the coast. Small craft advisories may be needed Saturday and Sunday. |
7 Day Forecast for Marine Location Near Elkton, MD
Hourly EDIT Helplocation: 39.57, -75.85 debug
Area Discussion for - Philadelphia/Mount Holly, PA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kphi 190111 afdphi area forecast discussion national weather service mount holly nj 911 pm edt Wed jul 18 2018 Synopsis High pressure will build in from the great lakes through Thursday before moving offshore Friday. A low pressure system will move up the coast on Saturday. Another low pressure system will meander over the midwest region this weekend and then drift southward toward the gulf coast region during the first half of next week. Near term until 6 am Thursday morning Forecast on track. No significant changes to the database. High pressure to the west will continue to push wast overnight. Clear skies tonight. It will be cool and dry with lows in the low mid 50s across the north and upper 50s low 60s elsewhere. Right along the shore and metro philadelphia may have lows the mid 60s however. Winds will be light overnight. Short term 6 am Thursday morning through 6 pm Thursday More fair weather is expected on Thursday as the high pressure builds overhead. Under mostly sunny skies, temperatures will climb into the low mid 80s in most areas. It will continue to be comfortable too with low dew points. Winds will be light from the NE or e. A sea breeze will likely develop across ERN nj de with winds locally 10 to 15 mph behind it. Long term Thursday night through Wednesday Thursday night through Friday night... Surface high pressure and upper ridge will progress downstream of our area off the new england coast late in the week as low pressure and associated upper trough digs southeastward across the midwest. A secondary low is favored to develop along the southeast u.S. Coast (near the base of the negatively tilted trough) by late Friday. The primary low over the midwest should remain far enough upstream of our area to keep us dry through at least Friday evening. However, chances for showers and storms were introduced late Friday night with the potential for the leading edge of the precip shield from the secondary coastal low to expand northward into our southern zones. Given uncertainty in both the track of the low and arrival timing of the precip, pops were kept very low (20-30 percent). E-se flow around the offshore high will have a trajectory from the ocean, which should keep the heat in check for the end of the work week- highs on Friday will generally be in the mid 80s except upper 70s along the coast and at higher elevations in NE pa and NW nj. Saturday and Saturday night... The aforementioned coastal low is forecast to move northward up the eastern seaboard. The sensible weather will be dependent on the exact track of the low, which is uncertain- models are still in disagreement and generally fall into to camps. (1) a low track right along the mid-atlantic coast would bring widespread rain to the forecast area on Saturday with a reasonable worst-case scenario being a washout for portions of the area that reside along and just east of the low track. (2) the other scenario supported by nwp guidance is a low track that is far enough offshore to keep the bulk of the precip shield off the coast. Sunday... The upper trough is forecast to sharpen to our west as the closed low digs southward through the midwest. Deep southerly flow throughout the troposphere will continue to draw tropical moisture (with pwats exceeding 2") poleward up the eastern seaboard on Sunday. Models show a warm front lifting northward through the region. The boundary could provide a focus for convective development during peak heating on Sunday. This setup warrants concern for locally heavy rainfall flash flooding across the area despite a lack of support from various model QPF output. Sunday night through Wednesday... Unsettled weather looks to dominate our forecast through most of the week next week as an upper-level trough remains stationed over the eastern u.S. A strong ridge of high pressure over the atlantic looks to keep the door closed to the progression of an upper-level trough of low pressure. This trough will remain stationary and fully cutoff by Sunday over the eastern |
u.S., as the GFS has been suggesting. The ECMWF has come into closer agreement as well, showing the low slowly filling and moving off to the south. The GFS has the low retrograding to the southwest towards the gulf of mexico through Wednesday. Regardless of which scenario, the threat for rain, possibly heavy at times continues throughout the early part of next week. There remains much uncertainty as to where the heaviest rain may fall, but the possibility of training storms exists as onshore southerly flow persists. Will need to monitor this event as it nears to see what short range models suggest before exact forecast amounts can be given. Aviation 01z Thursday through Monday The following discussion is for kphl, kpne, kttn, kabe, krdg, kilg, kmiv, kacy and surrounding areas. Tonight...VFR with mostly skc. North winds less than 5 knots or calm in most areas. Thursday...VFR. Only a few diurnal CU expected. Winds light and variable early, then NE or E during the afternoon. Sea breeze across ern nj expected. Outlook... Thursday night through Friday evening...VFR. SE winds under 10 kt. Forecast confidence: high late Friday night through Monday... Variable conditions with periods of MVFR ifr possible. Unsettled weather pattern will be accompanied by chances for showers and storms. Winds will vary from SE to S this weekend into early next week. Forecast confidence: moderate Marine High pressure will remain west of the waters tonight and then build overhead Thursday. Winds will favor N or NE directions tonight with speeds around 10 knots. On Thursday, winds will become southeast or east as the high builds overhead. Wind speeds will be around 5 to 10 knots. Fair weather expected tonight and Thursday. Seas mostly 2 to 3 ft on the ocean and 1 to 2 ft across delaware bay. Outlook... Thursday night through Friday night... Winds and seas below sca criteria. Saturday... East winds are expected to increase to 10-20 kt but with poor mixing over the relatively cooler waters, gusts to 25 kt will be limited. Regardless, a SCA may be needed with seas building to 5 ft in response to the strengthening onshore flow. Saturday night through Monday... S-se winds of 10-20 kt will continue. A SCA will likely be needed for our coastal waters with seas remaining in the 4-6 ft range. Rip currents... despite onshore flow, light wind speeds and calmer seas of 2-3 ft will yield a low risk for the formation of dangerous rip currents on Thursday. Phi watches warnings advisories Pa... None. Nj... None. De... None. Md... None. Marine... None. Synopsis... Klein near term... Mps o'hara short term... O'hara long term... Davis klein aviation... Klein marine... Klein o'hara |
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 |
| CHCM2 - 8573927 - Chesapeake City, MD | 4 mi | 37 min | SSW 1 G 1.9 | 67°F | 83°F | 1016.7 hPa | ||
| DELD1 - 8551762 - Delaware City, DE | 14 mi | 37 min | NE 8 G 8.9 | 75°F | 78°F | 1016.5 hPa | ||
| RDYD1 - 8551910 - Reedy Point, DE | 15 mi | 37 min | 74°F | 82°F | 1015.8 hPa | |||
| MRCP1 - 8540433 - Marcus Hook, PA | 28 mi | 37 min | 72°F | 81°F | 1016.4 hPa | |||
| TCBM2 - 8573364 - Tolchester Beach, MD | 32 mi | 37 min | ENE 1.9 G 4.1 | 72°F | 81°F | 1016.5 hPa | ||
| DRSD1 - Delaware Reserve, DE | 40 mi | 97 min | WNW 1 | 67°F | 1015 hPa | 67°F | ||
| FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 43 mi | 37 min | NE 5.1 G 6 | 75°F | 1016.1 hPa | |||
| FSNM2 | 43 mi | 37 min | NE 8 G 8.9 | 75°F | 1016.2 hPa | |||
| BLTM2 - 8574680 - Baltimore, MD | 44 mi | 37 min | NE 6 G 7 | 76°F | 83°F | 1015.9 hPa | ||
| PHBP1 - 8545240 - Philadelphia, PA | 45 mi | 37 min | 75°F | 81°F | 1015.8 hPa | |||
| CPVM2 | 49 mi | 37 min | 79°F | 62°F |
Wind History for Chesapeake City, MD
(wind in knots) EDIT (on/off) Help| 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 | 12 AM | 1 AM | 2 AM | |
| Last 24hr | NW | NW | N | NW | NW | N | N G8 | NW G8 | NW G11 | NW G12 | N G13 | N G13 | N G10 | NW G11 | N G13 | NW G11 | N | N | N | NW | N | S | S | -- |
| 1 day ago | SW | S | S | S | SW | SW G9 | W | SW G9 | W G7 | SW G10 | SW G9 | W G12 | W | N G18 | N G7 | NW | -- | NE | SE | W | W | SW | W | N |
| 2 days ago | S | -- | S | N | NW | SW | W G6 | NW | NW G9 | NW G9 | W | SW G12 | W G10 | W G9 | SW G8 | SW G11 | S | S | S | S | S | S |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Wilmington, New Castle County Airport, DE | 15 mi | 76 min | N 6 | 10.00 mi | Fair | 70°F | 55°F | 59% | 1016.3 hPa |
Wind History from ILG (wind in knots)
| 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 | 12 AM | 1 AM | |
| Last 24hr | NW | NW | N | NW | N | N | N | NW | N G14 | N | N | N G15 | N | N | N | N | N | N | N | N | NW | N | N | N |
| 1 day ago | S | S | S | S | S | S | S | SW | SW | W | SW | SW G17 | S G21 | W | NW G28 | W | NW | S | N | Calm | Calm | W | NW | NW |
| 2 days ago | Calm | SW | Calm | Calm | Calm | Calm | NW | W | W | SW | S | SW | S | S | S | S | S | S | S | SW | S | S | S | S |
Tide / Current Tables for Old Frenchtown Wharf, Maryland
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Old Frenchtown Wharf Click for Map Thu -- 12:22 AM EDT Moonset Thu -- 03:37 AM EDT 3.50 feet High Tide Thu -- 05:51 AM EDT Sunrise Thu -- 10:06 AM EDT 1.27 feet Low Tide Thu -- 01:13 PM EDT Moonrise Thu -- 03:36 PM EDT 3.21 feet High Tide Thu -- 03:53 PM EDT First Quarter Thu -- 08:27 PM EDT Sunset Thu -- 10:11 PM EDT 0.65 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 1.7 | 2.4 | 3.1 | 3.4 | 3.5 | 3.2 | 2.8 | 2.3 | 1.8 | 1.4 | 1.3 | 1.4 | 1.8 | 2.3 | 2.8 | 3.2 | 3.2 | 2.9 | 2.4 | 1.8 | 1.3 | 0.9 | 0.7 | 0.8 |
Tide / Current Tables for Chesapeake and Delaware Canal, Maryland/Delaware Current
EDIT (on/off) Help One Week of Data| Chesapeake and Delaware Canal Click for Map Thu -- 12:22 AM EDT Moonset Thu -- 12:52 AM EDT 1.96 knots Max Flood Thu -- 03:51 AM EDT -0.08 knots Slack Thu -- 05:51 AM EDT Sunrise Thu -- 06:41 AM EDT -1.76 knots Max Ebb Thu -- 10:02 AM EDT 0.06 knots Slack Thu -- 01:09 PM EDT 2.15 knots Max Flood Thu -- 01:13 PM EDT Moonrise Thu -- 03:53 PM EDT First Quarter Thu -- 04:11 PM EDT -0.09 knots Slack Thu -- 07:21 PM EDT -2.07 knots Max Ebb Thu -- 08:27 PM EDT Sunset Thu -- 11:21 PM EDT 0.07 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 1.8 | 2 | 1.7 | 1.2 | -0.5 | -1.3 | -1.7 | -1.7 | -1.5 | -1.1 | -0.2 | 1.3 | 1.9 | 2.1 | 2 | 1.5 | 0.6 | -1.2 | -1.8 | -2.1 | -2 | -1.8 | -1.5 | -0.8 |
Weather Map and Satellite Images
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GOES Local Image of 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 (2,6,7,8)
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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. |