Marine Weather Net

Delaware Bay south of East Point NJ to Slaughter Beach DE Marine Forecast


10 - 15


20 - 25


20 - 25



The Marine Weather Forecast In Detail:
ANZ431 Forecast Issued: 702 PM EDT Mon Sep 25 2023

Tonight...Ne Winds 10 To 15 Kt, Increasing To 15 To 20 Kt Late This Evening And Overnight. Waves 2 To 4 Ft. Light Rain Likely.
Tue...Ne Winds 20 To 25 Kt With Gusts Up To 30 Kt. Waves 3 To 5 Ft. Light Rain Likely.
Tue Night...Ne Winds 20 To 25 Kt With Gusts Up To 30 Kt, Diminishing To 15 To 20 Kt After Midnight. Waves 2 To 4 Ft. A Chance Of Light Rain.
Wed...Ne Winds Around 15 Kt With Gusts Up To 20 Kt. Waves 2 To 4 Ft.
Wed Night...Ne Winds 10 To 15 Kt. Waves 2 To 4 Ft.
Thu...Ne Winds Around 15 Kt With Gusts Up To 20 Kt. Waves 2 To 3 Ft. A Chance Of Showers In The Afternoon.
Thu Night...Ne Winds 15 To 20 Kt, Diminishing To 10 To 15 Kt After Midnight. Waves 2 To 3 Ft In The Evening. A Chance Of Showers.
Fri...Ne Winds 10 To 15 Kt. A Chance Of Showers.
Sat...Ne Winds 10 To 15 Kt.
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Area Forecast Discussion
National Weather Service Mount Holly NJ
653pm EDT Monday September 25 2023

The remnants of Ophelia will meander offshore through Wednesday, resulting in onshore flow and some lingering rain, especially toward the coast. High pressure builds over southern Quebec and the Northeast states, pressing southward through early Thursday. An upper level low passes by late in the week, but otherwise high pressure will expand southward from New England down the Appalachians through the weekend.

Near Term - Through Tuesday
As of 645 PM, a weak area of convergence along with some weak 850 mb frontogenesis appears to be responsible for an uptick in an area of mainly light rain across Ocean and Monmouth counties in particular. Elsewhere, some pockets of light rain or drizzle continues. Given the remnant low of Ophelia meandering offshore, much of the guidance shows an increase in mainly light rain across much of the coastal areas and for our northern zones through Tuesday morning as strung out shortwave energy arrives from the west. Given at least areas of light rain expected, did increase the Probability of Precipitation for these areas especially. Additional rainfall amounts through Tuesday are expected to be on the light side. Some minor adjustments were made to the hourly temperature, dew point and wind grids based on the latest observations and trends.

Otherwise, a strong area of high pressure remains to our north over Quebec and as this nudges south with the low lingering off the coast, a tightening pressure gradient will result. Therefore, northeasterly winds will be gusty especially by later tonight and Tuesday morning with gusts 25-40 mph (strongest along the coast). Otherwise, expect lows tonight mainly in the 50s except some upper 40s over the southern Poconos and low 60s right near the coast and over southern Delmarva.

There will be little change in the weather heading into Tuesday as the low sits off the coast while slowly sinking southeastward. This will keep conditions gusty and cool under mainly cloudy skies with continuing periods of light rain/drizzle. Trends though should be for the northern edge of the pockets of light rain to start pushing south through the day, meaning by afternoon it should be turning drier over our NE PA zones into NW NJ. In fact these areas could even see some peaks of sun by late day. Otherwise, it will be another dreary and damp day. It will also be a bit cooler compared to today with highs mainly in the upper 50s to low 60s.

Short Term - Tuesday Night Through Thursday
There could be a few lingering clouds and a couple scattered showers for the SE most areas of DE/NJ Tuesday evening, but then a dry forecast for Wed/Wednesday night as high pressure builds in from the north. After that, the onshore flow resumes and low pressure approaches from the west. We'll have low chances for showers Thu for NJ and Delmarva with slight chances for eastern PA. Cool temperatures for late September with highs in the 60s and low in the mid/upper 40s far N/W to the low/mid 50s elsewhere.

Long Term - Thursday Night Through Monday
Unsettled conditions will be across the area for the start of the long term as high pressure remain across the Canadian Maritime provinces and a persistent onshore flow continues. A upper trough and weak surface low will also be over the area Thu night thru Fri night. This will enhance the chance for clouds and showers over the area. Not all of the models agree with the scenario with a few keeping the showers mostly offshore. Below normal temperatures will continue into Sat with highs Fri/Sat in the upper 60s/low 70s.

Overall, the weekend looks rather benign at this point with high pressure building back across the area. There could be some lingering clouds/showers for the NJ/DE shore areas the first part of Sat, but other than that, a dry forecast is being prepared. Highs will continue a little below normal Sat then normal readings are forecasted for Sunday. Normal highs for this time of year are in the low/mid 70s with lows in the low/mid 50s.

Northeast winds will ramp up once again through tonight with Gales beginning by this evening for our northern ocean zones off the coast of Monmouth County and then spreading south through tonight encompassing all our ocean zones by Tuesday morning. Seas ramping up to 8 to 10 feet by Tuesday. Gales and high seas continue for the ocean waters through Tuesday with sCA conditions over the Delaware Bay.

Outlook... Prolonged SCA (Small Craft Advisory) conditions thru the period with Gales probable Tuesday night. Scattered showers/drizzle early Tuesday night then more Thu/Fri.

Tides / Coastal Flooding
An increasing northeast wind will begin to push additional water up along the coasts of New Jersey and Delaware into Tuesday. The pattern will likely result in some spotty minor tidal flooding with the current high tide cycle and with the one that occurs early on Tuesday.

Our main concern centers on the high tide cycle from Tuesday evening into Tuesday night. Positive tidal departures are forecast to increase back into the +1.5 to +2.5 foot range along the coasts of New Jersey and Delaware by that time. As a result, we are anticipating moderate tidal flooding focusing on Atlantic County and Cape May County in New Jersey, and Sussex County and Kent County in Delaware. Those areas have been placed under a Coastal Flood Warning.

Widespread minor flooding is expected for our remaining tidal areas in New Jersey and Delaware, and for the tidal Delaware River and its tidal tributaries from Tuesday evening into Tuesday night. A Coastal Flood Advisory is in effect for those locations.

The northeast flow should prevent any tidal flooding issues on the upper eastern shore of Chesapeake Bay.

This week's full (Harvest) moon will have particularly high astronomical tides associated with it. Based on the latest guidance showing a continued but somewhat weakening onshore flow, we may see additional periods of minor tidal flooding from late Tuesday night through the end of the week.

NOAA Mount Holly NJ Office: Watches - Warnings - Advisories
PA...Coastal Flood Advisory from 10pm Tuesday to 3am EDT Wednesday for PAZ070-071-106. NJ...Coastal Flood Advisory from 7pm Tuesday to midnight EDT Tuesday night for NJZ016. Coastal Flood Warning from 4pm Tuesday to midnight EDT Tuesday night for NJZ022>025. Coastal Flood Advisory from 4pm Tuesday to midnight EDT Tuesday night for NJZ012>014-020-021-026-027. High Risk for Rip Currents through Tuesday evening for NJZ014-025- 026. Coastal Flood Advisory from 10pm Tuesday to 3am EDT Wednesday for NJZ017>019. DE...Coastal Flood Advisory from 7pm Tuesday to midnight EDT Tuesday night for DEZ001. Coastal Flood Warning from 4pm Tuesday to midnight EDT Tuesday night for DEZ002>004. MD...None.

Small Craft Advisory until midnight EDT Tuesday night for ANZ430-431. Gale Warning until 6pm EDT Tuesday for ANZ450>452. Small Craft Advisory until 6am EDT Tuesday for ANZ453. Gale Warning from 6am to 6pm EDT Tuesday for ANZ453>455. Small Craft Advisory until 6am EDT Tuesday for ANZ454-455.