Monday, March30, 2020
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Marine Weather and Tides
Rehoboth Beach, 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 7:25PM Monday March 30, 2020 3:39 PM EDT (19:39 UTC) Moonrise 9:25AMMoonset 12:00AM Illumination 42% Phase: Waxing Crescent; Moon at 7 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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ANZ454 Coastal Waters From Cape May Nj To Cape Henlopen De Out 20 Nm- 257 Pm Edt Mon Mar 30 2020
.small craft advisory in effect from Tuesday afternoon through late Tuesday night...
This afternoon..SE winds around 5 kt, becoming sw late. Seas 3 to 4 ft. SWell mainly from the S with a dominant period of 7 seconds.
Tonight..NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. SWell mainly from the nw with a dominant period of 6 seconds.
Tue..N winds 10 to 15 kt, becoming ne in the late morning and afternoon. Seas around 3 ft early in the morning, then 2 ft or less, then 3 to 4 ft in the afternoon. SWell mainly from the ne with a dominant period of 8 seconds.
Tue night..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 7 ft. SWell mainly from the E with a dominant period of 7 seconds.
Wed..NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 4 to 7 ft.
Wed night..N winds 5 to 10 kt, becoming nw 15 to 20 kt with gusts up to 25 kt after midnight. Seas 3 to 5 ft.
Thu..NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Thu night..NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Fri..N winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft, building to 4 to 7 ft in the afternoon.
Fri night..NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 7 to 10 ft.
ANZ400 257 Pm Edt Mon Mar 30 2020
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. Low pressure located well off the coasts of new jersey and delaware early this morning will continue to move farther out to sea. A cold front approaching from the west is forecast to pass through our region this afternoon. Low pressure is expected to move across the southeastern states on Tuesday before passing off the north carolina coast on Tuesday night. High pressure from the west is anticipated to build slowly across our region during the period from Wednesday through Saturday. A weakening cold front may approach from the northwest on Sunday.


7 Day Forecast for Marine Location Near Rehoboth Beach, DE
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location: 38.72, -75.08     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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FXUS61 KPHI 301422 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 1022 AM EDT Mon Mar 30 2020

SYNOPSIS. Low pressure located well off the coasts of New Jersey and Delaware early this morning will continue to move farther out to sea. A cold front approaching from the west is forecast to pass through our region this afternoon. Low pressure is expected to move across the southeastern states on Tuesday before passing off the North Carolina coast on Tuesday night. High pressure from the west is anticipated to build slowly across our region during the period from Wednesday through Saturday. A weakening cold front may approach from the northwest on Sunday.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 1000 AM Update: Stratus has been very slow to mix out this morning. In fact, there has been very little change to the extent of the deck across the area since daybreak. However, still forecasting these clouds to mix out by around noon. The latest CAM guidance still indicates some convective activity this afternoon as cold air advection in the mid levels steepens lapse rates and results in surface based instability. This combined with deep layer shear values around 60 kts and modest mid to low level wind fields will support sustained convective showers with possibly some thunder. This activity may be accompanied by small hail and gusty winds up to around 50 mph.

Previous discussion . The convection from earlier has moved off the coast but abundant low level moisture remains in place due to moisture trapped beneath an inversion as there really hasn't been a good push of cool, dry air in the wake of the weakening occlusion as it's moved through. This has resulted in low stratus along with areas of mist and fog persisting. Area currently lies between surface lows as the secondary low has taken shape and is well off the coast while the primary low continues to weaken over Ontario. This latter feature has become "vertically stacked" with the low extending through through 500 mb.

As we head into the day Monday, upper low to our north will slowly pivot eastward as surface low dissipates. As this occurs it will drive some shortwave energy through the area during the afternoon along with a cold front at the surface. The result in terms of sensible weather will be that low stratus and any left over fog will quickly mix out through the morning but any sunshine will tend to be "self destructive" as as it leads to formation of significant strato cu by the afternoon due to the combination of surface heating and cooler air moving in aloft. This instability combined with the shortwave energy and front moving through will result in some scattered showers developing, mainly for areas north of Philly and especially near the I-78, I-80 corridors. Profiles look to become well mixed through at least 800 mb by this afternoon with winds of 30-40 knots near the top of the boundary layer. As a result, some of these afternoon showers could contain gusty winds of 35-45 mph along with some graupel or small hail. Otherwise, it will generally be breezy with W/SW winds gusting 20-30 mph. Highs should range from the low to mid 50s over NE PA and northern NJ to the mid 60s over SE PA and southern NJ to the upper 60s over southern Delmarva.

SHORT TERM /6 PM THIS EVENING THROUGH 6 AM TUESDAY/. The upper low north of the area will move off the coast tonight as it links up with a broad area of surface low pressure south of Nova Scotia. Afternoon showers will tend to diminish heading into the evening. However by the overnight period, as the upper low sets up off the coast the deep layer circulation around this feature will tend to pivot moisture and clouds back in from the east. This is all related to a blocking pattern developing over the north Atlantic tending to slow the movement of weather systems. The upshot is that variable skies this evening will give way to skies becoming mainly cloudy overnight from east to west as low stratus redevelops. This may also be accompanied by some areas of light rain and drizzle . especially over NE PA into NW NJ. Overnight lows look to be generally in the low to mid 40s except mid to upper 30s over the southern Poconos and NW NJ.

LONG TERM /TUESDAY THROUGH SUNDAY/. A mid level low is forecast to be located off the New England coast on Tuesday. The feature is expected to build back over New England and New York for Wednesday, then it is forecast to slide gradually to the east southeast. The mid level low is anticipated to keep clouds and a low or slight chance of showers in much of our region for Tuesday and Wednesday. Temperatures may be cold enough in the elevated terrain up north from late Tuesday night into early Wednesday morning to result in light snow showers or flurries.

The guidance continues to bring a surface low across the southeastern states on Tuesday before moving it off the North Carolina coast on Tuesday night. The models have been maintaining a trend where the northern edge of the low's rain shield will just reach southern Delaware and the adjacent counties of eastern Maryland from late Tuesday night into Wednesday morning.

High pressure is expected to extend from the Great Lakes to the Gulf of Mexico on Wednesday night. The air mass should build slowly eastward with the axis of the ridge passing off the coast on Saturday. We are anticipating fair weather and seasonable temperatures during the period.

A mid level short wave and a weakening cold front approaching from the northwest may arrive on Sunday. Presently, it appears as though they will have only a limited amount of moisture associated with them.

AVIATION /14Z MONDAY THROUGH FRIDAY/. The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Through Monday . As of 14Z, all sites are still IFR or lower. Conditions will gradually improve through 16Z as ceilings lift and visibilities improve. By this afternoon, expect scattered to broken strato cu deck at 5-8 kft. Winds light and variable early this morning becoming W/SW by Monday afternoon increasing to 10-15 with gusts up to 25 knots. It should also be noted, there could be some scattered showers this afternoon for areas mainly north of KPHL. These could contain graupel or small hail. Moderate confidence.

Tonight . VFR through most of the night with NW winds 5-10 knots. However low stratus looks to move back late at night with MVFR cigs likely developing for most sites by Tuesday morning. Moderate confidence.

Outlook .

Tuesday . VFR/MVFR ceilings with a chance of showers. North wind 5 to 10 knots becoming east. Medium confidence.

Tuesday night . VFR/MVFR ceilings. East to northeast wind 5 to 10 knots. Medium confidence.

Wednesday . VFR ceilings. Northeast wind 5 to 10 knots, becoming north. Medium confidence.

Wednesday night . Mainly VFR. Northwest wind 5 to 10 knots. Medium confidence.

Thursday . Mainly VFR. Northwest wind 10 to 15 knots. Medium confidence.

Thursday night . Mainly VFR. Northwest wind 5 to 10 knots. Medium confidence.

Friday . Mainly VFR. Northwest wind 5 to 10 knots, becoming northeast. Medium confidence.

MARINE. Seas remain elevated over the northern ocean zones with SCA in effect until 14z. These seas should diminish by this afternoon. However by this afternoon offshore winds will increase to 10-15 knots with some gusts of 20-25 knots possible for the near shore waters and over the DE Bay.

NW winds around 15 with gusts to around 20 knots will continue for Monday night with seas generally 3-4 feet.

Outlook .

Tuesday . No marine headlines are anticipated.

Tuesday night and Wednesday . A northeast wind gusting to 25 to 30 knots is forecast.

Wednesday night . Wave heights on our ocean waters may remain around 5 feet.

Thursday through Friday . No marine headlines are anticipated.

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

Synopsis . Iovino Near Term . Fitzsimmons/Staarmann Short Term . Fitzsimmons Long Term . Iovino Aviation . Fitzsimmons/Iovino/Staarmann Marine . Fitzsimmons/Iovino/Staarmann


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LWSD1 - 8557380 - Lewes, DE 5 mi52 min SSE 14 G 18 49°F 51°F1011.3 hPa
CMAN4 - 8536110 - Cape May, NJ 18 mi52 min ESE 7 G 11 47°F 49°F1011.8 hPa
BRND1 - 8555889 - Brandywine Shoal Light, DE 19 mi58 min SE 15 G 17 1012 hPa
OCSM2 26 mi160 min 3 ft
44009 - DELAWARE BAY 26 NM Southeast of Cape May, NJ 27 mi110 min S 5.8 G 7.8 45°F 50°F5 ft1009.8 hPa (-2.1)
OCIM2 - 8570283 - Ocean City Inlet, MD 27 mi58 min S 8.9 G 12 48°F 50°F1013 hPa
SJSN4 - 8537121 - Ship John Shoal, NJ 43 mi52 min ESE 18 G 20 47°F 1011.4 hPa

Wind History for Lewes, DE
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Georgetown - Delaware Coastal Airport, DE15 mi46 minSW 12 G 1910.00 miA Few Clouds71°F46°F42%1010.4 hPa
Wildwood, Cape May County Airport, NJ22 mi44 minSE 810.00 miOvercast49°F46°F90%1012.5 hPa

Link to 5 minute data for KGED

Wind History from GED (wind in knots)
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Last 24hrS7SE55SE4E6NE5NE6N6NE3NE4NE6CalmNE4NE6SW3W3CalmCalmSE3SE6S8S105SW12
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1 day agoE6E10N6NE8N4CalmN5NE6NE7NE3SW4CalmN6N6NE4NE4NE4CalmE3E4CalmCalmE8S9
2 days agoN7N6NW3CalmCalmCalmCalmCalmCalmS3CalmS6CalmS6NE4CalmN4SE5SE9E9E10
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Tide / Current Tables for Rehoboth Beach, Delaware
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Rehoboth Beach
Click for Map
Mon -- 12:28 AM EDT     Moonset
Mon -- 06:12 AM EDT     0.59 feet Low Tide
Mon -- 06:47 AM EDT     Sunrise
Mon -- 10:24 AM EDT     Moonrise
Mon -- 12:34 PM EDT     3.31 feet High Tide
Mon -- 06:03 PM EDT     0.65 feet Low Tide
Mon -- 07:22 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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43.73.12.21.40.80.60.71.11.82.533.33.32.92.21.40.80.70.81.222.93.5

Tide / Current Tables for Delaware Bay Entrance, Delaware Current
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Delaware Bay Entrance
Click for Map
Mon -- 12:28 AM EDT     Moonset
Mon -- 02:20 AM EDT     -0.00 knots Slack
Mon -- 05:54 AM EDT     -1.12 knots Max Ebb
Mon -- 06:47 AM EDT     Sunrise
Mon -- 09:00 AM EDT     0.00 knots Slack
Mon -- 10:23 AM EDT     Moonrise
Mon -- 11:56 AM EDT     0.94 knots Max Flood
Mon -- 02:48 PM EDT     -0.00 knots Slack
Mon -- 05:54 PM EDT     -0.92 knots Max Ebb
Mon -- 07:22 PM EDT     Sunset
Mon -- 08:41 PM EDT     0.00 knots Slack
Mon -- 11:55 PM EDT     1.26 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.70.2-0.4-0.8-1.1-1.1-1-0.6-00.50.80.90.80.4-0.1-0.5-0.8-0.9-0.8-0.40.20.81.1

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Philadelphia/Mount Holly, PA (15,3,4,5)
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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.