Sunday, July12, 2020
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Marine Weather and Tides
Smyrna, 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 5:45AMSunset 8:32PM Sunday July 12, 2020 5:30 PM EDT (21:30 UTC) Moonrise 11:56PMMoonset 11:59AM Illumination 51% Phase: Third Quarter Moon; Moon at 22 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- 402 Pm Edt Sun Jul 12 2020
Tonight..S winds 5 to 10 kt, becoming sw late. Waves 2 ft or less. A slight chance of tstms.
Mon..W winds 5 to 10 kt. Waves 2 ft or less.
Mon night..SW winds 5 to 10 kt, becoming nw in the late evening and overnight. Waves 2 ft or less.
Tue..NW winds around 10 kt. Waves 2 ft or less.
Tue night..NW winds 5 to 10 kt. Waves 2 ft or less.
Wed..NE winds 5 to 10 kt, becoming se 10 to 15 kt in the afternoon. Waves 2 ft or less.
Wed night..SE winds 10 to 15 kt. Waves 2 ft or less.
Thu..SE winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Waves 2 ft or less.
Thu night..SE winds 15 to 20 kt, becoming S 10 to 15 kt after midnight. Waves 2 ft or less.
Fri..S winds 10 to 15 kt. Waves 2 ft or less. A chance of tstms.
Fri night..S winds 10 to 15 kt. Waves 2 ft or less. A chance of tstms. Winds and waves higher in and near tstms.
ANZ400 402 Pm Edt Sun Jul 12 2020
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. A weak cold front will pass through the region tonight, then high pressure builds in from the west for Monday. SEveral upper level disturbances will pass through the region Monday and Tuesday, and then a backdoor cold front slides through on Wednesday as the high moves offshore. A series of cold fronts will then affect the region late this week and into the weekend.


7 Day Forecast for Marine Location Near Smyrna, DE
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location: 39.34, -75.6     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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FXUS61 KPHI 121933 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 333 PM EDT Sun Jul 12 2020

SYNOPSIS. A weak cold front will pass through the region tonight, then high pressure builds in from the west for Monday. Several upper level disturbances will pass through the region Monday and Tuesday, and then a backdoor cold front slides through on Wednesday as the high moves offshore. A series of cold fronts will then affect the region late this week and into the weekend.

NEAR TERM /UNTIL 6 AM MONDAY MORNING/. The frontal boundary offshore is now expected to begin to dissipate this evening as an area of low pressure moves northward toward the area, combining with a cold front that is approaching the area from the west. Showers and isolated thunderstorms associated with the cold front approaching from the west will continue to move spread across eastern Pennsylvania late this afternoon into this evening as a short wave/vorticity impulses moves into the area. As the low approaches from the south and merges with the cold front, additional short waves/vorticity impulses will move into the area from the south, leading to additional showers and possible thunderstorm development this evening. As the surface low passes to the north and the front moves toward the coast overnight, the shower/thunderstorm activity will diminish later in the night and toward daybreak Monday. CAPE values are forecast to build to as much as 1,000 J/kg later this afternoon into this evening, so some thunderstorms will be possible, as many of the CAMs are indicating mainly between 4 pm - 10 pm. However, shear is only 25 knots or less and mid level lapse rates are less than 6 C/km, so severe weather is not expected. Although DCAPE values approach 700-800 J/kg, so if any thunderstorms do develop, some stronger gusty winds could occur. PW values will range between 1.5-1.75 inches, so heavy rainfall will also be possible.

SHORT TERM /6 AM MONDAY MORNING THROUGH 6 PM MONDAY/. On Monday, the surface low will continue to lift to our north, while the cold front will stall out near the coast during the day. Meanwhile, another surface trough will move across the area during the day as it circles the low to our north. Most of the guidance keeps the forecast dry for much of the day Monday, although some guidance indicates some showers or thunderstorms possible across northern New Jersey and northeast Pennsylvania. We kept a slight chance of showers or thunderstorms everywhere due to the front near the coast and the surface trough moving in from the west. But overall, a drier forecast in store for much of our area as the majority of precipitation looks to remain north and south of the area. It will be another seasonably warm day, but dewpoints will be highest in the morning before lowering through the day, so it will become less humid by the afternoon.

LONG TERM /MONDAY NIGHT THROUGH SUNDAY/. Any lingering showers and thunderstorms will taper off Monday evening as the surface cold front and mid-level trough and shortwaves lift east of the region. Conditions dry out by midnight and high pressure centered over the Great Lakes and Ohio Valley will begin to push east.

Tuesday looks to be dry across the majority of the forecast area. There should be decent mixing due to a downsloping northwest flow, and expecting surface dewpoints to drop into the upper 50s/low 60s. Generally pleasant, despite it being warm with highs into the mid to upper 80s, probably near 90 along the urban corridor. One of those dry summer days where although it is warm, the Heat Index is actually a bit lower than the air temp.

With the base of upper trough just south of Long Island, some strong shortwave energy will dive through the southern Poconos and northern New Jersey in the afternoon. Will mention slight chance PoPs, as a few showers and thunderstorms are possible in the far northern zones, but moisture will be limited, so not expecting much convection.

High pressure continues to build east Tuesday night and slides offshore on Wednesday. This allows a backdoor cold front to slide through the region. Onshore flow sets up, and with some weak shortwave energy passing through the region, some showers are possible east of the I-95 corridor. Models showing minimal QPF, but will mention a slight chance for showers Wednesday afternoon, mainly for the eastern half of the forecast area. Really not expecting many showers and not much QPF at all, but a few could pop up as some convergence develops between the urban corridor and the New Jersey shoreline.

Conditions then get active for the late week period. Low pressure passing north of the region drags a cold front through the Great Lakes and Ohio Valley on Thursday, and the front slowly works its way across the Northeast Thursday night and Friday. Progression seems fairly slow, so will keep highest PoPs in the western zones Thursday afternoon and Thursday night before ramping up on Friday.

Another round of convection is possible Saturday as the front gets hung up south of the region over the Mid-Atlantic and some shortwave energy passes through the region. There is a better chance for convection Sunday as another cold front passes through. Will keep PoPs capped at chance both days.

AVIATION /20Z SUNDAY THROUGH FRIDAY/. The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Rest of today-this evening . Mostly VFR conditions will continue outside of any showers or thunderstorms. Isolated showers and thunderstorms will be possible for the rest of this afternoon into early evening. The most likely places for thunderstorms to affect the airport are for ABE and RDG. The rest of the TAF sites are expected to have showers this evening with little or no thunder. Generally VFR conditions are expected, although temporary locally lower conditions are possible with heaviest showers. Winds are mostly from the southwest 5-10 knots, with gusts 15-20 knots this afternoon. Winds gusts will diminish by sunset, then winds will be 5- 10 knots or less for the remainder of the evening.

This evening-Overnight . There will remain a chance of showers through much of the night, but showers will end from southwest to northeast through the night. Generally VFR conditions are expected, although temporary locally lower conditions are possible with heaviest showers. Winds will southwest 5-10 knots early, then become light and variable overnight, before shifting to the northwest behind a cold front.

Monday . Mostly VFR conditions are expected through the day. There is a chance of showers and thunderstorms, but the chance is too small to include in the TAFS. Winds will start off northwest 5-10 knots, but may shift to the west during the day.

Outlook .

Monday night . Lingering showers taper off, otherwise, VFR. NW winds less than 10 kt. Moderate confidence.

Tuesday . VFR. NW winds less than 10 kt. High confidence.

Wednesday . VFR. Shifting winds becoming SE less than 10 kt in the afternoon. Moderate confidence.

Thursday through Friday . Mainly VFR. Scattered SHRA/TSRA with locally sub-VFR conditions, especially Friday. S winds 10-15 kt during the day and less than 10 kt at night. Moderate confidence.

MARINE. Tonight-Monday . Conditions expected to remain below advisory levels through the period, although winds could gust around 20 knots at times. There is a chance of showers and thunderstorms for tonight into Monday which could lead to locally higher winds and waves.

Outlook .

Monday night . Seas on the ocean may touch 5 feet in the evening, but will subside through the overnight. Showers and thunderstorms taper off in the evening. Winds become NW around 10 kt.

Tuesday through Thursday . Sub-SCA conditions expected with seas 2-4 feet. Chances for thunderstorms increase late Thursday.

Rip Currents . A moderate risk for the formation of dangerous rip currents is forecast through Monday. Breezy southerly winds will combine with a medium-period southeasterly swell. Surf heights will generally be 2 to 4 feet.

EQUIPMENT. The NOAA Weather Radio All Hazards broadcast from Hibernia Park, PA (WNG704) remains off the air until further notice due to damage to the antenna during the June 3 derecho.

PHI WATCHES/WARNINGS/ADVISORIES. PA . None. NJ . None. DE . None. MD . None. MARINE . None.

Synopsis . Robertson Near Term . Robertson Short Term . Robertson Long Term . MPS Aviation . MPS/Robertson Marine . MPS/Robertson Equipment . WFO PHI


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SJSN4 - 8537121 - Ship John Shoal, NJ 12 mi49 min 83°F 1007.7 hPa
RDYD1 - 8551910 - Reedy Point, DE 15 mi43 min 84°F
CHCM2 - 8573927 - Chesapeake City, MD 17 mi43 min 84°F
DELD1 - 8551762 - Delaware City, DE 17 mi43 min SSW 7 G 12 88°F 78°F1006.9 hPa
MRCP1 - 8540433 - Marcus Hook, PA 34 mi43 min 82°F
TCBM2 - 8573364 - Tolchester Beach, MD 35 mi49 min S 4.1 G 7 84°F 83°F1007 hPa
BRND1 - 8555889 - Brandywine Shoal Light, DE 36 mi49 min S 17 G 19 1007.9 hPa
CMAN4 - 8536110 - Cape May, NJ 43 mi43 min SSE 13 G 16 81°F 77°F1007.5 hPa
LWSD1 - 8557380 - Lewes, DE 46 mi43 min S 8.9 G 15 86°F 78°F1007.6 hPa
CPVM2 48 mi97 min 85°F 67°F
PHBP1 - 8545240 - Philadelphia, PA 48 mi43 min 93°F 82°F1006 hPa

Wind History for Ship John Shoal, NJ
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Dover Air Force Base, DE15 mi35 minSW 910.00 miFair89°F62°F41%1007 hPa
Wilmington, New Castle County Airport, DE23 mi40 minSSW 10 G 1610.00 miFair87°F62°F43%1006.9 hPa

Link to 5 minute data for KDOV

Wind History from DOV (wind in knots)
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Tide / Current Tables for Taylors Bridge, Blackbird Creek, Delaware
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Taylors Bridge
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Sun -- 12:17 AM EDT     0.57 feet Low Tide
Sun -- 12:31 AM EDT     Moonrise
Sun -- 05:46 AM EDT     Sunrise
Sun -- 06:58 AM EDT     2.98 feet High Tide
Sun -- 12:44 PM EDT     0.39 feet Low Tide
Sun -- 12:59 PM EDT     Moonset
Sun -- 07:31 PM EDT     Last Quarter
Sun -- 07:35 PM EDT     2.92 feet High Tide
Sun -- 08:29 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.611.72.22.62.932.72.11.40.80.50.40.71.21.82.32.72.92.92.51.81.2

Tide / Current Tables for Chesapeake and Delaware Canal, Maryland/Delaware Current
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Chesapeake and Delaware Canal
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Sun -- 12:32 AM EDT     Moonrise
Sun -- 01:01 AM EDT     1.73 knots Max Flood
Sun -- 03:31 AM EDT     -0.08 knots Slack
Sun -- 05:46 AM EDT     Sunrise
Sun -- 06:37 AM EDT     -1.67 knots Max Ebb
Sun -- 09:38 AM EDT     0.03 knots Slack
Sun -- 01:00 PM EDT     Moonset
Sun -- 01:18 PM EDT     1.98 knots Max Flood
Sun -- 04:04 PM EDT     -0.01 knots Slack
Sun -- 07:17 PM EDT     -1.87 knots Max Ebb
Sun -- 07:31 PM EDT     Last Quarter
Sun -- 08:31 PM EDT     Sunset
Sun -- 11:10 PM EDT     0.02 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.71.50.9-0.8-1.3-1.6-1.6-1.4-0.80.61.21.721.91.40.4-1.2-1.6-1.9-1.8-1.5-1.1-0.5

Weather Map
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GEOS 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.
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Wind Forecast for Philadelphia/Mount Holly, PA (17,4,5,8)
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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.