Delaware Bay north of East Point NJ to Slaughter Beach DE Marine Forecast
| Today...S Winds 10 To 15 Kt. Seas Around 2 Ft. Wave Detail: Se 2 Ft At 3 Seconds. A Slight Chance Of Rain Late This Morning And Early Afternoon. A Slight Chance Of Rain And Tstms Late. |
| Tonight...Sw Winds 5 To 10 Kt, Becoming Nw After Midnight. Seas Around 2 Ft In The Evening, Then 1 Foot Or Less. Wave Detail: W 1 Foot At 2 Seconds And Se 1 Foot At 4 Seconds. Rain Likely. |
| Mon...Ne Winds 10 To 15 Kt. Seas Around 2 Ft. Wave Detail: N 1 Foot At 3 Seconds. |
| Mon Night...Ne Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 3 Ft. Wave Detail: E 3 Ft At 3 Seconds. A Chance Of Showers. |
| Tue...Ne Winds 20 To 25 Kt, Increasing To 25 To 30 Kt In The Afternoon. Seas 2 To 4 Ft. Wave Detail: Ne 4 Ft At 4 Seconds. Showers Likely. |
| Tue Night...Ne Winds 20 To 25 Kt With Gusts Up To 35 Kt. Seas 3 To 5 Ft. Wave Detail: Ne 4 Ft At 4 Seconds. Showers Likely, Mainly In The Evening. |
| Wed...Ne Winds 20 To 25 Kt, Increasing To 25 To 30 Kt In The Afternoon. Seas 3 To 5 Ft. A Chance Of Showers. |
| Wed Night...Ne Winds 25 To 30 Kt. Seas 3 To 5 Ft. A Chance Of Showers. |
| Thu...Ne Winds 25 To 30 Kt. Seas 3 To 5 Ft. A Chance Of Showers. |
| Thu Night...Ne Winds 25 To 30 Kt, Becoming N 20 To 25 Kt After Midnight. Seas 3 To 5 Ft. A Chance Of Showers. Winds And Seas Higher In And Near Tstms. |
| Area Forecast Discussion National Weather Service Mount Holly NJ 315am EDT Sunday September 20 2026 .WHAT HAS CHANGED... Multiple models have trended northward with the location of the frontal axis on Tuesday. As such, rain showers are likely for more of the region during that period. Models continue to struggle with the evolution and track of the late week coastal low. .KEY MESSAGES... 1. A cold front moves through the region late today into tonight, bringing rain at times through the day. 2. A stationary front south of the region could keep rain chances around, especially for Delmarva through mid week. 3. A closed mid-level low ejecting from the Ohio Valley could help to spin up surface low pressure off our coast by Thursday, potentially bringing another chance for rain, and increasing the risk for coastal flooding late this week. KEY MESSAGE 1...A cold front moves through the region late today into tonight, bringing rain at times through the day. The warm front associated with the main surface low will briefly move northward into the region early this afternoon, but will be quickly followed by a cold front late today into this evening. Low level flow will keep an onshore component through much of the day. As such, low level moisture is expected to increase through mid day, with surface dew points rising well into the 60s and precipitable water values increasing to near 2 inches. Precipitable water values that high are well above the 90th percentile for this time of year. However, with little instability, there will generally be a lack of embedded convection within the areas of rain. Instead, this will primarily be a more steady, stratiform rain event. As a result, the risk for excessive rainfall leading to flash flooding continues to be low. Given the high PWATs, there may still be some pockets of moderate rainfall at times, particularly for areas northwest of I-95. But the risk for flooding remains low (less then 5 percent) across the entire region. KEY MESSAGE 2...A stationary front south of the region could keep rain chances around, especially for Delmarva through mid week. The front will be south of the region on Monday and remain there through mid week. Confidence is not the highest pertaining to all aspects of sensible weather, namely precipitation. How far south that front sags south will be a big factor in how much rain we see through the week. The further south it stalls, the less likely our region will see continued rain chances through the mid week period. At least for Tuesday, multiple models trended slightly further north with the front, and as such, rain is likely on Tuesday generally for areas along and south of the PA Turnpike/195 corridors. Regardless, our region will be on the cool side of the front through this period keeping temperatures below normal. Confidence is higher here. KEY MESSAGE 3...A closed mid-level low ejecting from the Ohio Valley could help to spin up surface low pressure off our coast by Thursday, potentially bringing another chance for rain, and increasing the risk for coastal flooding. As a mid level low digs in from the northwest, models are showing surface cyclogensis by Wednesday off the Carolinas. There remain significant differences in the track and strength of the low. The closer the track is to the coast, the more likely our region will see rain and gusty winds on Thursday and Friday. Further complicating the picture, now multiple models depict the low initially progressing northeast before retrograding westward towards the coast at the end of the week. All that to say, the rain and wind forecast from Thursday onward remain very uncertain at this time. Regardless of the exact track, this low is very likely to increase the risk for tidal flooding. Track, strength of the low, duration of an onshore wind component, and fetch will all play a role with tidal departures. In addition, the full moon is on Saturday, meaning astronomical high tides are increasing as we get towards the end of the week. Long story short, some sort of tidal flooding may effect the region late week into early next week. Marine Conditions are expected to remain below SCA (Small Craft Advisory) criteria through tonight. Winds around 10-15 knots gradually transition from east- southeast tonight to southerly Sunday afternoon and evening. A front will shift winds to the northwest tonight. Outlook... Monday...On Monday, winds will gradually shift to northeasterly and begin to increase. An SCA (Small Craft Advisory) has been issued for the New Jersey coastal waters during the day on Monday, where there is higher confidence of SCA (Small Craft Advisory) conditions. However, this may need to be expanded later. From Monday Night onward, there is at least a chance of gale conditions for part of the period. However, differences in model timing and track of a coastal low in this period make it difficult to pinpoint when gale conditions will be the most likely. Rip Currents... Sunday...The winds shift to south/southeast but remain around 15 to 20 mph. Breaking wave heigheights in the surf zone look to be around 3 to 4 feet for the Jersey shore and 2 to 4 feet for the Delaware Beaches. There is a forecast of a MODERATE risk of dangerous and life threatening rip currents along the NJ and DE coast. Monday... We'll continue with the MODERATE risk for dangerous rip currents on Monday as winds will switch around to Northeast and increase to 15 to 20 mph during the day. Breaking waves in the surf zone will be around 2 to 3 feet mostly, but could end up a bit higher as winds remain moderate and gusty. For specific beach forecasts, visit weather.gov/beach/phi NOAA Mount Holly NJ Office: Watches - Warnings - Advisories PA...None. NJ...None. DE...None. MD...None. Marine Small Craft Advisory from 11am to 6pm EDT Monday for ANZ450>453. |
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