Delaware Bay north of East Point NJ to Slaughter Beach DE Marine Forecast
| Rest Of Today...Sw Winds 10 To 15 Kt With Gusts Up To 20 Kt, Diminishing To 5 To 10 Kt Late. Seas Around 2 Ft. Wave Detail: S 2 Ft At 4 Seconds. A Chance Of Rain And Snow Late This Morning, Then A Chance Of Rain Early This Afternoon. Vsby 1 To 3 Nm Late This Morning And Early Afternoon. |
| Tonight...Sw Winds Around 5 Kt, Becoming Nw After Midnight. Seas 1 Foot Or Less. Wave Detail: Se 1 Foot At 5 Seconds. A Chance Of Rain After Midnight With Vsby 1 To 3 Nm. |
| Sun...N Winds 5 To 10 Kt. Seas 1 Foot Or Less. Wave Detail: N 1 Foot At 2 Seconds. Snow Or Rain In The Morning, Then Snow In The Afternoon. Vsby 1 To 3 Nm. |
| Sun Night...Nw Winds 10 To 15 Kt. Seas Around 2 Ft. Wave Detail: Nw 1 Foot At 3 Seconds. |
| Mon...Sw Winds 10 To 15 Kt, Increasing To 15 To 20 Kt In The Afternoon. Seas Around 2 Ft. Wave Detail: Sw 2 Ft At 3 Seconds. |
| Mon Night...W Winds 15 To 20 Kt, Becoming Nw 20 To 25 Kt After Midnight. Seas 2 To 3 Ft. Wave Detail: Nw 3 Ft At 3 Seconds. |
| Tue...Nw Winds 15 To 20 Kt. Seas 2 To 3 Ft. |
| Tue Night...W Winds 10 To 15 Kt, Diminishing To 5 To 10 Kt After Midnight. Seas 1 To 2 Ft In The Evening, Then 1 Foot Or Less. |
| Wed...S Winds 10 To 15 Kt, Increasing To 15 To 20 Kt In The Afternoon. Seas 1 Foot Or Less, Then Around 2 Ft In The Afternoon. |
| Wed Night...Sw Winds 15 To 20 Kt. Seas Around 2 Ft. |
| Area Forecast Discussion National Weather Service Mount Holly NJ 252pm EST Sat Jan 17 2026 .WHAT HAS CHANGED... Today's system is winding down a bit sooner than expected. No additional snowfall is expected this afternoon and Winter Weather Advisories for today have been cancelled. Low pressure for Sunday continues to trend north and west with increasing confidence for most of the area to see 1 to 4 inches of snow. New Winter Weather Advisories have been issued for our urban corridor along with adjacent zones just north and south. .KEY MESSAGES... 1. Snow and rain with a warm front and associated low over the Great Lakes will continue to rapidly wind down this afternoon. 2. A coastal low is now expected to bring widespread snow accumulation to the area for Sunday with 1 to 4 inches generally expected. 3. A prolonged period of below normal temperatures are expected this upcoming week, with single digit and below zero wind chills possible both Monday Night and Tuesday Night. KEY MESSAGE 1...Snow and rain with a warm front and associated low over the Great Lakes will continue to rapidly wind down this afternoon. Low pressure will continue to move northeast through Ontario into Quebec through the rest of today as an associated piece of upper level energy lifts north and east out of the region into New England. As this occurs, precipitation will continue wind down west to east through the rest of this afternoon with little to n nothing in the way of additional accumulation. All precipitation should be over by early this evening. Beyond this time the main concern through the evening will be some potentially slippery surfaces as temperatures cool. However the airmass behind this wave is not especially cold so it will probably not be until late this evening or early overnight that areas near the I-95 corridor get down to at or below freezing. KEY MESSAGE 2...A coastal low is now expected to bring widespread snow accumulation to the area for Sunday with 1 to 4 inches generally expected. The latest indications are that the coastal low expected for Sunday will track a bit farther north and west than earlier thinking bringing a more widespread accumulating snowfall event to the area. Overnight tonight into early Sunday, a shot of upper level energy will be rounding the based of the long wave upper level trough over the east helping to initiate surface cyclogenesis near the SE coast along the baroclinic zone. Expect that associated precipitation with with this developing low will start to break out over the area around dawn from SW to NE. Given the lack of any "fresh" arctic air over the area along with the cloud cover, temperatures by late tonight will only be down into the 20s to around 30 north of the I- 95 corridor and in the low to mid 30s for areas along and SE here. As a result, current thinking is precipitation will likely start as rain or a rain/snow mix near the coast with even some mixing as far N/W as the I-95 corridor possible. However as we progress through the day Sunday the low will continue to deepen and move north and east off the coast with the center tracking by well to our east. As this occurs, precipitation should intensify somewhat through the late morning into the early afternoon with the system also infusing with an arctic boundary coming in from the west and shifting winds to more of a N/NW direction. The upshot of this as the precipitation should transition to mainly just snow through the late morning into the afternoon as temperatures hold fairly steady or even start to fall. With the shift in the system a bit farther north and west it now appears areas near and S/E of the urban corridor will see around .25 to .50 inches of liquid. The initial rain mix will keep snow amounts down near the coast where amounts of around .5 to 1.5 inches are expected. However this setup now looks to put the jackpot near the I- 95 corridor and adjacent zones on either side just NW and SE. As a result, we've issued a Winter Weather Advisory now in effect from 6AM to 8pm Sunday for these zones across the heart of our CWA (County Warning Area) where 2 to 4 inches of snow can generally be expected. North and west of here across the Lehigh Valley into the southern Poconos and extreme NW NJ generally expect around 1 to 2 inches of snow. The snow looks to eventually taper off late Sunday afternoon into the evening from west to east as the deepening low pulls away. KEY MESSAGE 3...A prolonged period of below normal temperatures are expected this upcoming week, with single digit and below zero wind chills possible both Monday Night and Tuesday Night. A deep trough sets up over the eastern US on Sunday Night, ushering in an arctic airmass. The stretch of below normal temperatures commences that night, with lows in the mid to upper teens for most. The height of the cold airmass will be over our area on Monday Night through Tuesday, where 850 mb temperatures will be around -15 to -20 C, resulting in low temperatures at the surface into the teens and single digits. Combined with breezy winds expected Monday night, this will result in wind chills between -10 and -15 in the southern Poconos, below zero over the Lehigh Valley, and in the single digits over the rest of the area. We almost certainly need some cold weather headlines, especially in the southern Poconos, but cannot rule them out for the rest of the region. With the arctic airmass directly overhead on Tuesday, highs won't climb out of the 20s. With a steady westerly breeze, wind chills will be in the single digits and the low teens. Areas in the southern Poconos likely won't get above 0 even during the daytime. High pressure will center itself overhead Tuesday night, allowing winds to diminish and skies to become mostly clear. We could see decent radiational cooling as a result, potentially leading to more widespread overnight lows in the single digits than the previous night. While temperatures may be colder, the calmer winds will make the wind chills less severe, though still in the single digits for most and below zero in the southern Poconos. These values will not warrant any cold weather headlines, but it will be bitterly cold nonetheless. We break the cold snap on Wednesday as temperatures get toward more seasonable levels, and even potentially above normal on Thursday. However, a cold front moving through sometime late week will drop temperatures back to near or slightly below normal levels to end the work week. Marine A Small Craft Advisory remains in effect for all NJ and DE Atlantic Coastal Waters through 7 PM. Southwest winds of 15-20 kt with gusts up to 25 kt continue this afternoon before diminishing by early this evening. Seas around 5 feet or so will be diminishing as well. Low pressure will bring rain mixed at times with snow over the waters for Sunday with increasing NW winds in the system's wake for Sunday night. Another Small Craft Advisory will likely be needed. Outlook... Sunday Night...SCA (Small Craft Advisory) conditions possible (20-40%). Rain/snow expected on the coastal waters. Monday through Tuesday...SCA (Small Craft Advisory) conditions likely (60-70%) with wind gusts out of the west/southwest around 25-30 kt and seas near 5 feet. Tuesday Night...No marine headlines expected. Wednesday through Wednesday night...SCA (Small Craft Advisory) conditions possible (50%) as gusts out of the south/southwest get near 25 kt. NOAA Mount Holly NJ Office: Watches - Warnings - Advisories PA...Winter Weather Advisory from 6am to 8pm EST Sunday for PAZ070-071-101>106. NJ...Winter Weather Advisory from 6am to 8pm EST Sunday for NJZ008>010-012-013-015>019. DE...Winter Weather Advisory from 6am to 8pm EST Sunday for DEZ001. MD...None. Marine Small Craft Advisory until 7pm EST this evening for ANZ450>455. |
Dover DE Radar
Northeast Radar