Cape Henlopen to Fenwick Island DE out 20 nm Marine Forecast
| Today...Nw Winds 15 To 20 Kt, Increasing To 20 To 25 Kt Late This Morning And Early Afternoon, Then Diminishing To 15 To 20 Kt Late. Seas 2 To 4 Ft. Wave Detail: Nw 3 Ft At 4 Seconds And S 1 Foot At 7 Seconds. |
| Tonight...N Winds 10 To 15 Kt With Gusts Up To 20 Kt, Becoming Ne 5 To 10 Kt After Midnight. Seas 2 To 3 Ft. Wave Detail: N 3 Ft At 4 Seconds And S 1 Foot At 7 Seconds. |
| Thu...Sw Winds 10 To 15 Kt, Becoming W In The Afternoon. Gusts Up To 25 Kt. Seas 2 To 4 Ft. Wave Detail: S 3 Ft At 6 Seconds And E 3 Ft At 11 Seconds. A Chance Of Rain In The Morning. |
| Thu Night...N Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 3 To 5 Ft. Wave Detail: N 3 Ft At 5 Seconds And S 3 Ft At 6 Seconds. |
| Fri...Ne Winds 15 To 20 Kt, Becoming E Around 10 Kt In The Afternoon. Seas 3 To 5 Ft. Wave Detail: Ne 4 Ft At 6 Seconds And E 3 Ft At 11 Seconds. A Chance Of Rain And Snow In The Afternoon With Vsby 1 To 3 Nm. |
| Fri Night...Se Winds 10 To 15 Kt. Seas 3 To 4 Ft. Wave Detail: E 4 Ft At 10 Seconds And Se 2 Ft At 4 Seconds. Rain. Vsby 1 To 3 Nm In The Evening. |
| Sat...Ne Winds 10 To 15 Kt. Seas 3 To 4 Ft. A Chance Of Rain In The Morning. |
| Sat Night...Ne Winds 5 To 10 Kt. Seas 3 To 5 Ft. |
| Sun...E Winds Around 10 Kt, Becoming S In The Afternoon. Seas Around 4 Ft. A Chance Of Rain In The Afternoon. |
| Sun Night...Sw Winds 15 To 20 Kt, Becoming W 20 To 25 Kt After Midnight. Seas 4 To 6 Ft. Rain Likely, Mainly In The Evening. |
| Area Forecast Discussion National Weather Service Mount Holly NJ 627am EST Wednesday Dec 24 2025 Synopsis Weak high pressure will build into the region through tonight before sliding offshore. A weak clipper system will slide quickly through the area on Christmas Day, then high pressure will build again into Friday morning. A low pressure system will bring widespread wintry precipitation to the region late Friday through Friday night. Another system will impact the region late Sunday, followed by cold and dry high pressure into early next week. Near Term - Through Tonight Drying out today with breezy northwest winds into the afternoon. Seasonable temperatures expected, with highs mainly in the 40s today and lows in the 20s to low 30s tonight. Guidance continues to indicate potential for wind gusts near 40-50 mph across the Pocono Plateau and higher elevations of northwest New Jersey developing through this morning. This will be due to strong low level winds developing beneath an inversion and the Bernoulli effect accelerating winds across the ridge lines and mountain peaks, and significant wind gusts are not expected outside of these areas. A Wind Advisory remains in effect for Carbon and Monroe Counties through 1pm today. Elsewhere, gusts around 25-35 mph are forecast. The winds will diminish through the afternoon, and become calm tonight. Short Term - Thursday Through Saturday Mostly cloudy, but seasonable for Christmas Day with a chance of sprinkles or flurries early. A winter storm is expected to impact the region with widespread wintry precipitation starting Friday into Friday night, however exact amounts and precipitation types remain uncertain. Light wintry precipitation could lingering into Saturday morning. For Christmas Day: not great weather, but not bad either for late December. A weak mid level shortwave trough will pass through during the morning hours, which could produce some brief sprinkles or flurries south of I-78. There's only a 20-30% chance of measurable precip, so most places will probably remain dry. Skies will be mostly cloudy through the day, but temperatures will be near normal with highs in the 40s for most. Southwest winds 5-10 mph shifting northwest in the afternoon as a cold front passes through. For Christmas night: The cold front will usher in a colder and drier airmass. Temperatures are expected to fall into the 10s near and north of I-78, and into the low to mid 20s south of I-78 by Friday morning. Skies will be partly cloudy. Winds relatively light, so wind chill won't be much of a factor. For the Friday through Friday night winter storm: Bottom line up front - We are near 100% confident that most of our area will receive wintry precipitation of some variety, save for our southern Delmarva zones. The biggest question marks remains the Quantitative Precipitation Forecast and precipitation type forecast. Thus, the exact amount of snow, sleet, and ice that any given location will receive remains uncertain at this time. Folks with travel plans from Friday afternoon through Friday night should expect impacts to their plans, as road conditions will likely deteriorate during this time with snowy and/or icy roads. Meteorological forecast details follow below. An unusual and thus very challenging meteorological forecast setup for the Friday through Friday night winter storm. A polar jet ridge will be building into eastern Canada, which will provide low level cold, dry air from Canadian high pressure needed for wintry precipitation in our region. Meanwhile, a subtropical trough will attempt to amplify as it slides just to our southwest Friday night. This will push a low pressure system from the lower Great Lakes and upper Ohio Valley region Friday across the Appalachians Friday night and offshore of the Mid Atlantic coast by Saturday morning. This setup will result in widespread precipitation for our region (near 100% chance). Temperatures will likely be near to well below freezing across the area Friday night, which will support accumulating wintry precipitation. A warm nose around 750 mb will push eastward into the area from the west as precipitation spreads into the region around midday Friday or Friday afternoon, with its 0C+ temperatures reaching as far east as the Lehigh Valley, Philly metro, and southern New Jersey. East of this line (northern and central NJ), precipitation will likely remain all or mostly all snow. Near and west of this line may experience some snow initially on Friday before changing to sleet, or perhaps some freezing rain or plain rain depending on surface temperatures and timing. For precipitation type along and west of this line, it appears sleet will be most favorable for much of the event, as the melting layer will be quite high in the atmosphere and have plenty of well below freezing air and time to refreeze into sleet before reaching the ground. Some freezing rain is certainly possible for far western areas in the CWA (County Warning Area) (SE PA, Philly proper, northern Delmarva), especially later in the event when low level temperatures (850-925 mb) warm closer to or above freezing. As for our current deterministic forecast totals, we stuck closely with the NBM as uncertainty remains very high on the exact amounts. Quantitative Precipitation Forecast amounts range from around 0.5-0.75" in most areas. Snowfall totals range from 1-3" in northern Delmarva, far southern NJ, and SE PA to 4-7" in eastern PA and much of NJ. These totals could end up lower in the transition zone (where ever that ends up) and areas that experience mostly sleet. It's possible some areas get 1-2"+ of pure sleet. Ice amounts are as much as 0.1-0.25" in portions of SE PA, but these could be too high if mostly sleet occurs. Probabilistic amounts likely paint a better picture at this stage in the forecast. The chance of plowable snow/sleet (2" or more) is around 50-70% for northern DE, far southern NJ, and west of I-476 in PA. Elsewhere to the north and east (where precipitation is likely all snow), probabilities increase substantially to around 70-90%. The probability of 5" or more is around 60-70% from Burlington County and north in NJ and adjacent counties in PA, then drop off precipitously as you go west and south from there. The probability of 0.10" of ice or more is around 30-60% in SE PA and northern DE. So to make this long AFD short, there is nearly a 100% chance of wintry precipitation that will likely cause travel issues beginning during the day Friday through Friday night, and potentially lingering into Saturday morning. A Winter Storm Watch was considered with this update, but the probability of warning level snow is not large enough in coverage at this point for one. Watches may need to be considered in future updates though. trong> The late Saturday and Saturday night period will be in between systems. A slight chance of precipitation possible, but nothing significant. Mostly cloudy skies and seasonable temperatures. For late Sunday through early Monday, a much more mild and mostly wet system is anticipated to impact the region with widespread rainfall. Details remain unclear, but should be a mostly beneficial rainfall will potential for some light wintry precipitation during precipitation onset. Temperatures near normal Monday will be a post frontal day with breezy and colder conditions as Canadian high pressure builds into the area. Wind gusts over 40 mph possible. Wind chills in the single digits Monday night. Colder and remaining blustery on Tuesday with highs near to below freezing for most. Lows in the 10s to low 20s. Marine Small Craft Advisory conditions developing through this afternoon in the wake of a cold front. Northwest wind gusts 30-35 kts and seas 3-5 feet. The threat for gale force wind gusts has increased for areas north of Little Egg Inlet, so the advisory was upgraded to a Gale Warning for these zones. Winds and seas diminish tonight. Outlook... Thursday through Thursday Night...Advisory conditions possible as another frontal system passes offshore. Wind gusts 20-25 kts possible. Friday...No marine hazards expected. Friday night through Sunday...Advisory conditions possible through this period as two systems impact the region. Widespread wintry precipitation Friday through Friday night. Rain Sunday. NOAA Mount Holly NJ Office: Watches - Warnings - Advisories PA...Wind Advisory until 1pm EST this afternoon for PAZ054-055. NJ...None. DE...None. MD...None. Marine Small Craft Advisory until 4pm EST this afternoon for ANZ430- 431-452>455. Gale Warning until 4pm EST this afternoon for ANZ450-451. |
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