Cape Henlopen to Fenwick Island DE out 20 nm Marine Forecast
| Today...Nw Winds 15 To 20 Kt, Diminishing To 5 To 10 Kt. Seas 4 To 6 Ft, Subsiding To 3 To 4 Ft This Afternoon. Wave Detail: N 4 Ft At 5 Seconds And Se 3 Ft At 8 Seconds, Becoming N 3 Ft At 6 Seconds And Se 3 Ft At 9 Seconds. |
| Tonight...W Winds 5 To 10 Kt. Seas 2 To 3 Ft. Wave Detail: N 2 Ft At 5 Seconds And Se 2 Ft At 9 Seconds. |
| Thu...W Winds 10 To 15 Kt, Becoming Nw 20 To 25 Kt In The Afternoon. Seas 2 To 3 Ft, Building To 3 To 5 Ft In The Afternoon. Wave Detail: W 2 Ft At 4 Seconds And Se 2 Ft At 11 Seconds, Becoming N 4 Ft At 5 Seconds And Se 2 Ft At 10 Seconds. |
| Thu Night...Nw Winds 20 To 25 Kt, Becoming N 15 To 20 Kt After Midnight. Seas 3 To 5 Ft. Wave Detail: N 4 Ft At 5 Seconds And Se 2 Ft At 10 Seconds. |
| Fri...E Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas 2 To 3 Ft. Wave Detail: N 2 Ft At 4 Seconds And Se 2 Ft At 10 Seconds. A Chance Of Rain And Snow In The Afternoon. |
| Fri Night...Sw Winds 5 To 10 Kt, Becoming Nw After Midnight. Seas 2 To 3 Ft. Wave Detail: Se 2 Ft At 10 Seconds And N 1 Foot At 5 Seconds. Rain Likely, Mainly In The Evening. |
| Sat...Nw Winds 5 To 10 Kt. Seas 2 To 3 Ft. A Chance Of Rain In The Morning. |
| Sat Night...Nw Winds 5 To 10 Kt. Seas 2 To 3 Ft. |
| Sun...N Winds Around 10 Kt. Seas 2 To 3 Ft. |
| Sun Night...N Winds 10 To 15 Kt. Seas 2 To 3 Ft. |
| Area Forecast Discussion National Weather Service Mount Holly NJ 444am EST Wednesday Dec 3 2025 Synopsis High pressure gradually builds in from the southwest Wednesday. A strong cold front crosses our area Thursday, followed by high pressure later Thursday night into Friday. An area of low pressure is currently forecast to track just to our south and east later Friday into Saturday, followed by a cold front later Sunday. Near Term - Through Tonight Tranquil conditions are expected across the region throughout the near term forecast period. High pressure is slowly building northeastward into the region out of the south-central United States. Winds early this morning remain elevated as a fairly tight pressure gradient remains over the region with the surface low off the coast of New England. Gusts of 20-25 mph will gradually weaken through the morning hours as the high comes closer and the gradient relaxes. Otherwise, lingering cloud coverage and the elevated winds have kept us a bit warmer so far this morning. With cloud coverage and winds weakening, temps will likely dip over the next couple of hours before sunrise, with lows in the upper 20s to near freezing for most. Any remaining wet spots may become slick with black ice as temperatures fall, particularly north of I-78 where the greatest amounts of frozen precipitation fell on Tuesday. Heading into the daytime hours, a dry and mostly sunny day is expected. High temperatures will be in the mid 30s to low 40s. Winds will continue to decrease, especially in the afternoon, as the center of the high approaches and then begins to settle to the south of the region. By tonight, a surface trough looks to begin to approach the region from the northwest, which will bring some more clouds to the area, particularly northwest of the I-95 corridor. A dry night is still expected though with the high remaining close by. Lows in the 20s are expected for most locations. Short Term - Thursday and Thursday Night A cold front is slated to push through the region during the day Thursday before cold high pressure builds in Thursday night. While the cold front will be rather gusty and usher in a much colder airmass, it will largely be dry, only bringing a risk of snow showers across the Poconos and high elevations of northwestern NJ. Cannot fully rule out the possibility these snow showers could be more of the snow squall variety, but at the moment, snow squall conditions look to remain better across upstate NY and along the NY/PA border, diminishing as it reaches the Poconos. W-NW winds will gust up to 25-35 mph in the afternoon with temperatures only warming into the mid 30s to low 40s. Behind the front, temperatures will take quite the tumble Thursday night with lows falling into the teens and low-20s for much of the region with single digits across the Poconos and high elevations of northwestern NJ. Thankfully, winds are expected to diminish after sunset, limiting how low wind chills will get. Long Term - Friday Through 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, including the I-95 corridor. 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, which some ensemble members do suggest remains a possibility. 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 and at the moment, the snowfall potential with this system looks to remain on the lighter side. 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 early this morning. Seas will reach 3-6 feet as well. As a result, a Small Craft Advisory remains in effect for all coastal waters. For today, 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 today. By this evening, winds will be westerly around 10-15 knots with gusts up to 20 knots, and seas will be around 3-4 feet. These conditions will persist through tonight. Outlook... Thursday...Small Craft Advisory conditions probable. Friday through Sunday The conditions are anticipated to be below Small Craft Advisory criteria. Climate Cold temperatures forecasted early Friday morning may challenge a few records. Record lows at our climate sites for 12/05 are listed below: Record Low Temperatures for December 5th... SITE RECORD/YEAR Allentown (ABE) 11/1926 AC Airport (ACY) 11/1966 AC Marina (55N) 15/1901 Philadelphia (PHL) 13/1886 Wilmington (ILG) 12/1926 Reading (RDG) 12/1926 Trenton (TTN) 10/1926 Mount Pocono (MPO) -2/1971 Georgetown (GED) 14/1966 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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