Delaware Bay south of East Point NJ to Slaughter Beach DE Marine Forecast
| Today...Nw Winds 15 To 20 Kt, Diminishing To 5 To 10 Kt. Seas 2 To 4 Ft. Wave Detail: Nw 3 Ft At 4 Seconds And Se 1 Foot At 8 Seconds. |
| Tonight...W Winds 5 To 10 Kt. Seas Around 2 Ft. Wave Detail: Nw 1 Foot At 3 Seconds And Se 1 Foot At 9 Seconds. |
| Thu...W Winds 10 To 15 Kt, Becoming Nw 20 To 25 Kt In The Afternoon. Seas 2 To 3 Ft. Wave Detail: W 3 Ft At 3 Seconds And Se 1 Foot At 9 Seconds. |
| Thu Night...Nw Winds 20 To 25 Kt With Gusts Up To 30 Kt, Becoming N 15 To 20 Kt After Midnight. Seas 2 To 4 Ft. Wave Detail: Nw 3 Ft At 4 Seconds And Se 1 Foot At 10 Seconds. |
| Fri...Ne Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas Around 2 Ft. Wave Detail: Nw 2 Ft At 4 Seconds And Se 1 Foot At 10 Seconds. A Chance Of Rain And Snow In The Afternoon. |
| Fri Night...W Winds Around 5 Kt, Becoming Nw After Midnight. Seas 1 Foot Or Less. Wave Detail: Se 1 Foot At 10 Seconds. Rain Likely, Mainly In The Evening With Vsby 1 To 3 Nm. |
| Sat...Nw Winds Around 5 Kt. Seas 1 Foot Or Less. |
| Sat Night...Nw Winds 5 To 10 Kt. Seas Around 2 Ft. |
| Sun...N Winds 5 To 10 Kt. Seas Around 2 Ft. |
| Sun Night...N Winds 10 To 15 Kt. Seas Around 2 Ft. |
| Area Forecast Discussion National Weather Service Mount Holly NJ 1232am EST Wednesday Dec 3 2025 Synopsis Low pressure continues to move offshore overnight. Following it, high pressure gradually builds in from the southwest late tonight and Wednesday. A strong cold front crosses our area during Thursday, followed by high pressure later Thursday night into Friday. An area of low pressure is currently forecast to track just to our south an east later Friday into Saturday, followed by a cold front later Sunday. Near Term - Through Today Dry conditions have resumed across the region but clouds will prevail for much of the night. More clearing arrives by dawn with clouds holding fast across the northwestern portion of the region the longest. Gusty northwest winds continue with gusts up to 20-25 mph. Lows tonight will drop into the 20s for most, which may lead to some black ice issues where any slushy snow melt refreezes on roadways (especially north of I-78). A high pressure system remains in control for Wednesday with dry conditions. It will be a colder day with highs in the mid 30s to mid 40s. A breezy wind out of the northwest in the morning at 15-20 mph will lessen through the day. Short Term - Tonight Through Thursday Night Following a subtle upper-level ridge axis, enhanced southwesterly flow aloft will begin to overspread the area into Thursday as a trough digs southeastward over portions of Ontario and eventually Quebec. The trough axis will pass to the north/glance the region Thursday. Subtle height rises will follow with the flow aloft becoming more zonal Thursday night. At the surface, high pressure will build in from the west on Wednesday. A surface low will pass well to the north of the area on Thursday, however a strong trailing cold front moves through Thursday. Wednesday night will feature increasing clouds from northwest to southeast as the cold front begins to approach the region. Lows will be mostly in the 20s. Thursday will feature more clouds ahead of and with a strong cold front. Moisture looks to be rather limited with this cold front and the main lift also slides by to our north. There is some chance though, low, that a few snow showers occur with the front across mostly the Poconos. A west-northwest wind increases and turns gusty (gusts up to 30 mph) during the day Thursday before diminishing at night. The notable breeze will add to the chill factor. Highs generally in the 30s northwest of I-95 and 40s to the southeast. As the winds diminish Thursday night, temperatures look to bottom out in the teens for many areas with even some single digits in parts of the Poconos. Long Term - Friday Through Tuesday Synoptic Overview...An initial zonal flow aloft gives way to a shortwave trough crossing our area later Friday into Saturday. The flow aloft may then undergo amplification across the East later in the weekend into early next week. At the surface, high pressure departs to start Friday then low pressure develops and slides to our south before it shifts farther offshore into Saturday. A cold front arrives then later Sunday with weak high pressure nearby Monday into Tuesday. For Friday and Saturday...High pressure is centered over our area to start within an initial zonal flow aloft. A shortwave trough however looks to quickly arrive later in the day Friday and especially Friday night. This feature does not appear to sharpen much as it arrives given the more zonal flow aloft ahead of it, although this could change if additional energy can phase with it. A cold and very dry air mass is forecast to be in place, and this may hinder the northward placement of a precipitation shield. Surface low pressure is forecast to develop and track to our south as a result and tend to be a quick mover. Given the current synoptic setup, the highest probability of precipitation is across the southern to eastern areas (Delmarva to southeastern New Jersey). Some snow or even a wintry mix is possible across these areas with even some change to rain, with snow then as the main precipitation type farther north. Something to watch however is whether a zone of frontogenesis or strengthening frontogenesis occurs resulting in a banding feature north to northwest of the surface low. This would tend to occur if the mid level wave sharpens more than currently forecast. The details will be determined by the track and strength of the system which will then determine the precipitation types and amounts. Given the uncertainty with these (finer) details no major changes were made to the National Blend of Model (NBM) guidance. Rather cold Friday with high ranging from mid to upper 20s far north to upper 30s far south. It turns milder then Saturday in the wake of the system, however still below average. For Sunday through Tuesday...An upper-level trough across eastern Canada may undergo amplification south and eastward through about Monday before weakening occurs. Another piece of energy dropping down into the Mid-Mississippi Valley may then sharpen the trough eastward again Tuesday with surface low pressure potentially approaching our area during Tuesday. Quite a bit of uncertainty with the evolution of the features within the larger scale trough, therefore just some slight chance Probability of Precipitation (20 percent) in the forecast as of now at times Sunday night through Tuesday. Temperatures currently are forecast to be on the cold side, especially early next week. Marine Gusty northwest winds around 25-30 knots continue across all coastal waters. Occasional gusts to 35 knots are possible on the ocean zones tonight. Seas will reach 3-6 feet tonight as well. As a result, a Small Craft Advisory remains in effect for all coastal waters through the overnight period. For Wednesday, the Small Craft Advisory on the Delaware Bay will end at 6am while the Atlantic Ocean coastal waters go through 1 PM. Winds and seas will continue to lessen through the day Wednesday. Outlook... Wednesday night...The conditions are anticipated to be below Small Craft Advisory criteria. Thursday...Small Craft Advisory conditions probable. Friday through Sunday The conditions are anticipated to be below Small Craft Advisory criteria. Climate Widespread moderate to heavy precipitation occurred on Tuesday. A few daily precipitation records were challenged. Records for our climate sites prior to Tuesday's rainfall are listed below: Record Precipitation (Rainfall) December 2 Site Record/Year Allentown (ABE) 0.86"/1934 AC Airport (ACY) 1.03"/1996 AC Marina (55N) 1.18"/1929 Georgetown (GED) 1.11"/1974 Mount Pocono (MPO) 3.56"/1996 Philadelphia (PHL) 1.48"/1986 Reading (RDG) 1.29"/1981 Trenton (TTN) 2.13"/1986 Wilmington (ILG) 1.27"/1991 NOAA Mount Holly NJ Office: Watches - Warnings - Advisories PA...None. NJ...None. DE...None. MD...None. Marine Small Craft Advisory until 6am EST early this morning for ANZ430-431. Small Craft Advisory until 1pm EST this afternoon for ANZ450>455. |
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