Marine Weather Net

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


20 - 25


5 - 10


10 - 15


15 - 20

The Marine Weather Forecast In Detail:
ANZ431 Forecast Issued: 402 AM EDT Thu Mar 30 2023

Today...N Winds 20 To 25 Kt, Becoming Nw 5 To 10 Kt. Waves 2 To 3 Ft, Subsiding To 1 To 2 Ft This Afternoon.
Tonight...Sw Winds 5 To 10 Kt. Waves Around 2 Ft Or Less.
Fri...S Winds 10 To 15 Kt With Gusts Up To 25 Kt. Waves Around 2 Ft Or Less, Then Around 2 Ft In The Afternoon.
Fri Night...Sw Winds 15 To 20 Kt With Gusts Up To 30 Kt. Waves 2 To 3 Ft. Showers.
Sat...Sw Winds 20 To 25 Kt With Gusts Up To 35 Kt. Waves 2 To 4 Ft. Showers.
Sat Night...W Winds 25 To 30 Kt. Waves 2 To 4 Ft. A Chance Of Showers In The Evening.
Sun...Nw Winds 25 To 30 Kt, Diminishing To 15 To 20 Kt In The Afternoon, Then Diminishing To 5 To 10 Kt In The Evening, Becoming Se After Midnight. Waves 2 To 4 Ft.
Mon...S Winds Around 10 Kt, Becoming 10 To 15 Kt. Waves 1 To 2 Ft.
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Area Forecast Discussion
National Weather Service Mount Holly NJ
610am EDT Thu Mar 30 2023

High pressure centered in the southern Great Lakes region early this morning will build to the southeast. The core of the air mass is forecast to slide off the Virginia coast this afternoon before moving farther out to sea. A warm front approaching from the southwest is expected to lift through our region on Friday. Strong low pressure is anticipated to pass across the Great Lakes on Friday night before moving down the Saint Lawrence River Valley on Saturday. The low is forecast to pull a strong cold front through our area on Saturday evening. High pressure is expected to follow for Sunday into Monday. A frontal boundary may drop into our region from the northwest on Monday night and it could meander in our vicinity on Tuesday and Wednesday.

Near Term - Through Tonight
Fair weather is expected today and tonight as high pressure will be building in. The high will be west of the area this morning, then crest overhead later this afternoon. Tonight it will move offshore. Mostly sunny skies are expected and temperatures a little below normal for the last day of March. Highs will range from the mid/upper 40s for the N/NW areas and upper 40s/low 50s for other locations. Winds will be west to northwest at 10 to 15 mph this morning then decreasing by late afternoon. Light winds are expected overnight.

We will issue a frost advisory for our Delmarva areas already in the growing season with lows forecasted to be in the low/mid 30s.

Short Term - Friday Through Saturday Night
Warm advection will likely result in increasing and lowering cloud cover for Friday into Friday night. We are also anticipating showers to begin moving into our region on Friday afternoon, with the potential for rain becoming categorical on Friday night. A south to southwest wind is forecast to increase to 10 to 15 MPH. Highs on Friday are expected to be mostly in the 50s and 60s. The cloud cover and mild flow will likely prevent temperatures from falling below the 50s in most of our region on Friday night.

A strengthening low level southwesterly jet, with its core just to our southeast, should continue to draw mild moist air into and over our region from Friday night into Saturday morning. As a result, we will keep showers in the forecast for Saturday morning.

The low level jet should begin to slide away to our east and northeast on Saturday afternoon, allowing for some clearing at that time. Regardless, the pressure gradient will likely remain rather tight in our region as a strong cold front approaches from the northwest. We should experience a southwesterly wind around 20 to 30 MPH with the potential for gusts in excess of 40 MPH. Eventually, we may need to issue a Wind Advisory for parts of our area for Saturday. The strong flow will continue to draw mild air into our region. Afternoon high are expected to be in the lower 70s, except along the immediate coast and in the elevated terrain where readings should not get above the 60s.

A robust cold front is expected to push southeastward through our region on Saturday evening. It should bring another round of showers. Mixed layer CAPE values are expected to be marginally unstable, mainly in the 250 to 500 J/Kg range. Being the it will be a fairly dynamic system, we have included a slight chance of thunder. However, the thunder potential may need to be increased as we get closer to the event.

Once the front passes, strong cold advection is expected to begin. A brisk northwest wind will bring temperatures down into the upper 20s and 30s on Saturday night.

Long Term - Sunday Through Wednesday
Surface high pressure is expected to slide from the Ohio River Valley on Sunday morning to the western North Atlantic on Monday. We are forecasting dry weather for both days. Sunday's highs should be mainly in the upper 40s to middle 50s. Temperatures are anticipated to rise well into the 60s in much of our region on Monday afternoon in the return flow on the back side of the high.

The forecast for Tuesday and Wednesday depends on a frontal boundary that is expected to drop into our region from the northwest. There remains a fair amount of spread in the model and ensemble solutions regarding the front's timing and location. For now, we will keep above normal temperatures for both days and mention a chance of showers for Wednesday.

West to northwest winds have increased behind the cold front and the SCA (Small Craft Advisory) flag in place should continue into the morning. Gusts around 25 kts are expected for Delaware Bay for the hours until around 8am then for the ocean a few hours after that. Fair weather today and tonight.

Outlook... Friday...South wind increasing to 20 to 25 knots.

Saturday...South wind 20 to 25 knots with gale force gusts possible.

Sunday...Northwest wind 15 to 20 knots with gusts of 25 to 30 knots.

Monday...South wind 10 to 15 knots with gusts near 25 knots.

NOAA Mount Holly NJ Office: Watches - Warnings - Advisories
PA...None. NJ...None. DE...Frost Advisory from 2am to 8am EDT Friday for DEZ002-003. MD...Frost Advisory from 2am to 8am EDT Friday for MDZ012-015-019- 020.

Small Craft Advisory until 8am EDT this morning for ANZ430- 431. Small Craft Advisory until 10am EDT this morning for ANZ450>455.