Marine Weather Net

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


THIS AFTERNOON

S
WINDS
10 - 15
KNOTS

TONIGHT

S
WINDS
10 - 15
KNOTS

SUN

S
WINDS
10 - 15
KNOTS

SUN NIGHT

S
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
ANZ454 Forecast Issued: 302 PM EDT Sat May 21 2022

This Afternoon...S Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 3 Ft. Swell Mainly From The S With A Dominant Period Of 6 Seconds.
Tonight...S Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 3 To 4 Ft. Areas Of Fog In The Late Evening And Overnight With Vsby 1 To 3 Nm. Swell Mainly From The S With A Dominant Period Of 5 Seconds.
Sun...S Winds 10 To 15 Kt. Gusts Up To 20 Kt In The Afternoon. Seas 3 To 4 Ft. Areas Of Fog Until Late Afternoon. A Chance Of Tstms Late. Vsby 1 To 3 Nm Until Late Afternoon. Swell Mainly From The S With A Dominant Period Of 5 Seconds.
Sun Night...S Winds 10 To 15 Kt With Gusts Up To 20 Kt, Becoming Nw With Gusts Up To 20 Kt In The Late Evening And Early Morning, Then Becoming Around 10 Kt With Gusts Up To 20 Kt Late. Seas 3 To 4 Ft. A Chance Of Tstms Early In The Evening. Showers Likely Until Early Morning. A Chance Of Tstms Late In The Evening. Swell Mainly From The S With A Dominant Period Of 5 Seconds, Becoming Mainly From The N With A Dominant Period Of 5 Seconds After Midnight.
Mon...N Winds 10 To 15 Kt With Gusts Up To 20 Kt, Becoming Ne 5 To 10 Kt In The Afternoon. Seas Around 3 Ft.
Mon Night...Ne Winds 5 To 10 Kt, Increasing To 10 To 15 Kt After Midnight. Seas 2 Ft Or Less, Then Around 3 Ft After Midnight.
Tue...Ne Winds 10 To 15 Kt. Seas 3 To 4 Ft.
Tue Night...E Winds 10 To 15 Kt. Seas 3 To 4 Ft.
Wed...E Winds Around 10 Kt. Seas 3 To 4 Ft.
Wed Night...Se Winds Around 10 Kt. Seas 3 To 4 Ft. A Chance Of Showers. Winds And Seas Higher In And Near Tstms.
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Area Forecast Discussion
National Weather Service Mount Holly NJ
316pm EDT Sat May 21 2022

Synopsis
Bermuda high pressure remains off the Mid-Atlantic coast through Sunday. A strong cold front will move through Sunday night as low pressure passes to the northwest, with the front slowly settling offshore on Monday. High pressure builds in for Tuesday and Wednesday, then a frontal system may approach the area later next week.

Near Term - Through Sunday
Bermuda high pressure remains entrenched off the Southeast and Mid-Atlantic coast, and mid-level ridging extends from the Mid- Atlantic through the Northeast as well.

Hot and humid conditions in place into this evening, with high temperatures in the mid and upper 90s. Surface dew points should mix out a bit, lowering from the upper 60s to the mid 60s during peak heating. This will result in max heat index values in the upper 90s to near 100. Heat Advisories remain in effect.

After sunset, dew points will recover, rising back into the upper 60s, possibly near 70 throughout. A warm night on tap with lows in the 60s to low 70s, and in the mid 70s in and around Philadelphia.

Air mass of 850 mb temperatures from +19C to +20C will slide offshore tonight, and 850 mb temperatures will be around +17C Sunday. Combined with increasing clouds from an approaching cold front, temperatures will not be as hot as they are today, and highs will top off in the upper 80s to lower 90s. However, dew points will be several degrees higher than today. Max heat index values will be in the mid and upper 90s. Will keep Heat Advisory in effect for Sunday.

Surface high pressure slides to the south and east, and mid- level ridging along the coast slides offshore. Low pressure passing north of the region will drag a cold front east, and that front should be through the Ohio Valley and into western New York and western Pennsylvania by Sunday evening. Convection flares up ahead of that front along a thermal trough and tracks east. Showers and thunderstorms approach far western areas late in the day.

SB CAPE values will be upwards of 2000 J/kg, and the Lifted Index will be around -7C. 0-6 km Bulk Shear will generally be 15 to 20 kt for most of the region, except 25 to 30 kt in the southern Poconos and far northwest New Jersey. The bulk of the upper level energy should stay well north of the region, and those areas will be closest to the base of the upper trough. PWATs (Precipitable Waters) will range over 1.5 inches, and with little in the way of steering current aloft, can expect heavy rain and localized flooding to develop across the region.

Short Term - Sunday Night Through Monday Night
Any thunderstorms with the cold front will move offshore early Sunday night. The front will settle into Virginia and North Carolina as a much cooler and less humid airmass settles over the region Sunday night through Monday night with dewpoints in the 40s.

Long Term - Tuesday Through Saturday
The long term forecast remains on track per the latest model guidance.

A general warming trend in temperatures is expected through the long term period as mid-level heigheights again start to rise across the eastern United States. Meanwhile, across the western United States heigheights will rapidly fall as an upper level low begins to wrap up on Tuesday. The upper level low will slowly approach the area by Friday with precipitation chances slowly rising by the end of the period.

Surface high pressure will be centered over southern Quebec on Tuesday with a boundary remaining across North Carolina. There may be a few showers across southern Delaware with the front to the south.

On Wednesday, the surface high pressure over Quebec will slowly start to translate towards the Canadian Maritimes and then offshore. The upper level low over the western United States will be well on its way east towards the Ohio River Valley Thursday and Friday. As this occurs, a surface cyclone over MO will head north towards MI with a warm front moving northward across the area Thursday. The closed upper level low will then begin to become absorbed back into the upper level flow and track northeast. As this occurs, another cold front will approach the area from the west bringing the chance of showers and thunderstorms back to the region Thursday and Friday. All precipitation moves offshore Friday night with a tranquil day in store for Saturday as surface high pressure builds back into the region.

Marine
S-SW winds 10 to 15 kt through tonight, and then wind increase to 20 kt on Sunday. Not expecting frequent and widespread 25+ kt wind gusts on Sunday, so a Small Craft Advisory should not be needed. Seas will build to 3 to 4 feet. Showers and thunderstorms possible late Sunday afternoon.

Areas of fog look to form on the waters once again tonight.

Outlook... Sunday night...Wind will be south to southwest Sunday evening, shifting to north behind the cold front.

Monday - Wednesday
No marine headlines are currently anticipated. Offshore winds early on Monday, becoming onshore later Monday into Tuesday and through midweek. Seas of 2 to 4 ft expected.

Thursday...Winds and waves below small craft advisory levels with scattered showers and thunderstorms.

Rip Currents... There is a LOW risk for the development of dangerous and life threatening rip currents at NJ and DE beaches for the rest of today and Sunday.

Climate
A hot and humid air mass is forecast to overspread the region this weekend. The hottest day will be Saturday. Here is a list of the high temperature records for Saturday and the record high temperatures for the month of May.

Locations 5/21 Record High Temps May Record High Temps --------- ---------------------- ---------------------

Philadelphia, PA 95 in 1934 97 in 1991 Reading, PA 96 in 1996 96 in 1996/ 1962 Allentown, PA 92 in 1934 97 in 1962 Mount Pocono, PA 87 in 1911 94 in 1911 Trenton, NJ 94 in 1934 99 in 1986/ 1911 Atlantic City (airport), NJ 93 in 1996 99 in 1969 Atlantic City (marina), NJ 85 in 1934 95 in 1925/ 1895 Wilmington, DE 95 in 1996 98 in 1895 Georgetown, DE 94 in 1996 98 in 1991

NOAA Mount Holly NJ Office: Watches - Warnings - Advisories
PA...
Heat Advisory until 6pm EDT Sunday for PAZ070-071-102-104-106.
Heat Advisory until 10pm EDT this evening for PAZ101-103-105. NJ...
Heat Advisory until 6pm EDT Sunday for NJZ008-010-012-015- 017>019.
Heat Advisory until 10pm EDT this evening for NJZ009-013-020- 027. DE...
Heat Advisory until 6pm EDT Sunday for DEZ001. MD...None.

Marine
None.