Delaware Bay north of East Point NJ to Slaughter Beach DE Marine Forecast
| Today...Nw Winds 5 To 10 Kt. Seas 1 Foot Or Less. Wave Detail: Nw 1 Foot At 2 Seconds. |
| Tonight...N Winds Around 5 Kt. Seas 1 Foot Or Less. |
| Sun...N Winds Around 5 Kt. Seas 1 Foot Or Less. |
| Sun Night...Ne Winds 5 To 10 Kt. Seas 1 Foot Or Less. Wave Detail: Ne 1 Foot At 2 Seconds. |
| Mon...Ne Winds 10 To 15 Kt. Seas Around 2 Ft. Wave Detail: Ne 1 Foot At 3 Seconds. |
| Mon Night...Ne Winds 10 To 15 Kt, Increasing To 15 To 20 Kt After Midnight. Seas 2 To 3 Ft. Wave Detail: Ne 2 Ft At 3 Seconds. |
| Tue...Ne Winds 15 To 20 Kt, Increasing To 20 To 25 Kt In The Afternoon. Seas 2 To 4 Ft. |
| Tue Night...Ne Winds 15 To 20 Kt. Seas 2 To 4 Ft. A Chance Of Showers. |
| Wed...N Winds 15 To 20 Kt. Seas 2 To 3 Ft. A Chance Of Showers In The Afternoon. |
| Wed Night...N Winds 20 To 25 Kt. Seas 2 To 4 Ft. A Chance Of Showers. |
| Area Forecast Discussion National Weather Service Mount Holly NJ 107pm EDT Sat Oct 25 2025 Synopsis High pressure dominates the area into the start of the new week. Low pressure may affect the area around the middle to end of next week. Near Term - Through Tonight More pleasant weather today and tonight as high pressure continues across the area. Weak upper ridging today and a fast moving weak trough moves thru at H5 tonight. Only a few clouds will accompany the upper trough tonight. Temperatures will continue a little below normal with highs today in the upper 50s across the north and low 60s elsewhere. Lows tonight will be mostly in the mid/upper 30s N/W and upper 30s/low 40s S/E. Short Term - Sunday Through Monday Surface high pressure over eastern Canada will dominate the region through the weekend into the start of the new week. A closed upper low will pivot over northern New England with several shortwaves passing through the region into early next week. Overall, tranquil conditions are expected for the second half of the weekend and into early next week. Spotty sprinkles cannot be ruled out, but confidence is not high enough to include in the forecast at this time. While for the majority, the region will remain dry, the biggest concern in the short term period will be with frost development in areas where the growing season remains active. Expect lows Sunday night mainly be in the mid to upper 30s for areas outside the urban corridor and along the shore which will be in the 40s. By Monday night low temperatures may be a bit warmer, especially south of the urban corridor, due to increasing cloud cover from the south. Otherwise, daytime highs during the period will remain a few degrees below normal under a mix of sun and clouds. Long Term - Monday Night Through Friday There remains a lot of uncertainty in the long range forecast, especially around the middle to end of next week. Some of the forecast models continue to indicate a strong coastal storm developing and affecting the region while others have a weaker system farther east with more limited impacts. In the big picture, to start the period there looks to be an elongated upper level low that will continue to be situated to our north as it extends from the Canadian Maritimes into New England. Meanwhile, strong and expansive surface high pressure will be over Quebec with an upper level ridge centered near James Bay. The main uncertainty is in how the upper level trough / low over the northeast interacts with an active southern stream that will be ejecting multiple strong waves eastward across the CONUS. The GFS (Global Forecast System) suggests that the southern stream remains largely surpressed until the end of the week when a modest but not overly impressive system develops off the east coast and passes off to our east as it moves north and east. Meanwhile the 12z ECMWF (European Centre for Medium-Range Weather Forecasts) and the GEM favor a solution that phases a strong piece of upper level energy moving westward around the trough to our north with a strong southern stream wave moving east. This solution would favor a stronger low moving northward along the coast around the Thursday into Friday timeframe. This is also supported by some of the GEFS members. Then there also Tropical Cyclone Melissa to further complicate things. While this storm should most likely pass well to our east, it's possible some of it's moisture gets entrained into the coastal system. This all said, we kept our forecast close to the National Blend of Models (the NBM). In terms of sensible weather, as low pressure starts to organize to our south Monday night into Tuesday there will be a strengthening pressure gradient between this system and the high to our north. The result will be strengthening northeast winds, especially along the coast where winds could be gusting 20 to 30 mph by late Tuesday. There also looks to be increasing cloud cover with some light rain/showers and/or drizzle possible, especially along the coastal plain. The low to our south may take some time to organize meaning conditions may not change too much into Wednesday. Given this we keep a continuing 20-30 percent chance of precipitation in the forecast with continuing northeast winds for Wednesday. Also worth noting, coastal flooding will be an increasing concern given the persistent onshore flow. Beginning Wednesday night and lasting into Thursday of next week looks to be the period to really watch for things to turn stormy across the area. This is the time period generally favored for the potentially strong coastal storm to move north and affect the area with strong winds and heavy rain. Again a lot of uncertainty regarding this at the present time. And if the timing ends up being a bit slower (as per the GFS) impacts could occur more towards next Friday. Regardless, the long term period looks to feature generally below average temperatures along with the chances for precipitation with highs in the 50s and lows in the mid 30s to low 40s. Marine High pressure builds across the waters today and tonight. Decreasing winds and seas. North/Northwest winds 5 to 10 knots much of the time. Outlook... Sunday through Monday...No marine headlines expected at this time. Winds generally less than 20 kt with seas of 2-4 feet. Monday night through Wednesday...SCA (Small Craft Advisory) conditions likely, with potential gale force conditions. Wind gusts between 25-35 kt with seas building as high as 10 feet. NOAA Mount Holly NJ Office: Watches - Warnings - Advisories PA...None. NJ...None. DE...None. MD...None. Marine None. |
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