Marine Weather Net

Cape May NJ to Cape Henlopen DE out 20 nm Marine Forecast


TONIGHT

W
WINDS
15 - 20
KNOTS

SUN

W
WINDS
20 - 25
KNOTS

SUN NIGHT

SW
WINDS
15 - 20
KNOTS

MON

W
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
ANZ454 Forecast Issued: 404 PM EST Sat Jan 16 2021

SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY AFTERNOON
Tonight...W Winds 15 To 20 Kt, Increasing To 20 To 25 Kt After Midnight. Gusts Up To 30 Kt. Seas 4 To 6 Ft. A Slight Chance Of Showers Early This Evening. Swell Mainly From The S With A Dominant Period Of 8 Seconds.
Sun...W Winds 20 To 25 Kt With Gusts Up To 30 Kt, Diminishing To 15 To 20 Kt With Gusts Up To 25 Kt Late. Seas 4 To 6 Ft. Swell Mainly From The Sw With A Dominant Period Of 6 Seconds.
Sun Night...Sw Winds 15 To 20 Kt With Gusts Up To 25 Kt, Becoming W 10 To 15 Kt With Gusts Up To 20 Kt After Midnight. Seas 3 To 4 Ft. Swell Mainly From The S With A Dominant Period Of 7 Seconds.
Mon...W Winds 10 To 15 Kt With Gusts Up To 20 Kt, Increasing To 15 To 20 Kt With Gusts Up To 25 Kt In The Afternoon. Seas 3 To 4 Ft. A Chance Of Sprinkles In The Late Morning And Afternoon. Swell Mainly From The S With A Dominant Period Of 6 Seconds.
Mon Night...W Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 3 To 4 Ft.
Tue...W Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 3 To 4 Ft.
Tue Night...W Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas Around 3 Ft.
Wed...Nw Winds 15 To 20 Kt. Seas 3 To 4 Ft.
Wed Night...Nw Winds 15 To 20 Kt, Becoming W 10 To 15 Kt After Midnight. Seas Around 3 Ft.
Thu...Sw Winds 10 To 15 Kt. Seas Around 3 Ft. A Chance Of Showers In The Afternoon.
Thu Night...W Winds Around 15 Kt. Seas 3 To 4 Ft. A Chance Of Showers In The Evening.
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Area Forecast Discussion
National Weather Service Mount Holly NJ
339pm EST Sat Jan 16 2021

Synopsis
Low pressure will slowly meander across northern New England tonight into Sunday, then across eastern Canada early next week. A couple of clipper systems are expected to pass north of the Mid Atlantic during the middle and end of next week, while a couple of surface boundaries move across the east coast.

Near Term - Until 6am Sunday Morning
Deep closed upper low over western Pennsylvania lifts northeast towards New England tonight, and then towards the Gulf of maine by daybreak Sunday. Some strong shortwave energy rotates around the base of the upper low passes through Delmarva in the evening, and may touch off some light rain showers in the far southern areas during that time.

As the upper low departs, another cold front passes through the region tonight.

Not anticipating radiational cooling tonight, as clouds will not break up until late tonight, and west winds will be up around 10 mph. But with Cold Air Advection underway, lows tonight will be in the mid and upper 20s in the southern Poconos and far northwest New Jersey and in the upper 20s and low 30s elsewhere.

Short Term - 6am Sunday Morning Through Sunday Night
Mid-level ridging builds over the area as the upper low departs on Sunday. Winds of 35-45 kt at 925-850 mb will pass over the area, and with increasing sunshine, mixing will be strong enough for surface winds 15-20 mph with 25-35 mph wind gusts. High temps only a few degrees cooler than Saturday, but still 5-7 degrees above normal, topping out in the 30s and low 40s in the southern Poconos, and in the mid to upper 40s elsewhere.

Long Term - Monday Through Saturday
A couple of potential weather systems are forecast to remain to our north this upcoming week and may bring active weather to New England, but there are some small chances of precipitation during the upcoming week.

On Monday, a backdoor cold front is forecast to get hung up to our north and not fully make it into the Mid Atlantic region. However, it may get close enough to bring some snow showers down into the Poconos, especially as low-mid level lapse rates steepen and moisture increases. This may also help to lead to a chance of light rain/sprinkles and/or light snow showers/flurries during the day Monday for much of the area. This lift/moisture combination will diminish by sunset everywhere except the Poconos so any sprinkles/flurries are expected to end by evening except across the Poconos where it could linger into the overnight.

By Tuesday night into Wednesday, a clipper system is forecast to move out of the Great Lakes and pass to our north. However, it will likely bring a cold front or surface trough across the east coast. As this happens, lapse rates and moisture will increase across the area, so there will again be a chance of light snow showers/flurries for much of the area Tuesday night into Wednesday. As the lift associated with the lapse rates and short wave, as well as the moisture pass to the east, any precipitation will end during the day.

A brief period of ridging develops Wednesday night, before moving east Thursday as the frontal system associated with the next clipper system moves across the east coast Thursday. The main slipper low may not make it across New England until Friday, so another surface boundary may move across the area Friday. Thursday has the greatest chance of rain or snow as this is when moisture is maximized across the area. However, showers could linger into early Friday as moisture could be slow to move out if another trough moves across the area.

Marine
Tight westerly gradient develops over the waters this evening, and west winds will increase to 15-20 kt with 25-30 kt gusts and remain through Sunday. SCA (Small Craft Advisory) remains in effect. A few gale gusts are possible, especially over northern NJ ocean waters, late Sunday morning.

Outlook... Sunday night...Small Craft Advisory conditions may linger into the evening for the Atlantic Ocean Waters, before subsiding overnight.

Monday-Monday night...Winds may increase to Small Craft Advisory levels during the day Monday into Monday evening.

Tuesday...Conditions may lower back below advisory levels, but remain gusty around 20 knots.

Tuesday night-Wednesday...Conditions are forecast to increase back to Small Craft Advisory levels.

Wednesday night-Thursday...Conditions are forecast to lower back below advisory levels by Wednesday night.

NOAA Mount Holly NJ Office: Watches - Warnings - Advisories
PA...None. NJ...None. DE...None. MD...None.
MARINE...
Small Craft Advisory until 6pm EST Sunday for ANZ450>455. Small Craft Advisory until 6pm EST Sunday for ANZ430-431.