Marine Weather Net

Great Egg Inlet to Cape May NJ out 20 NM Marine Forecast


TONIGHT

SW
WINDS
10 - 15
KNOTS

THU

SW
WINDS
5 - 10
KNOTS

THU NIGHT

SW
WINDS
5 KNOTS

FRI

N
WINDS
10
KNOTS

The Marine Weather Forecast In Detail:
ANZ453 Forecast Issued: 703 PM EDT Wed Jul 17 2024

SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY MORNING ...SEVERE THUNDERSTORM WATCH 553 IN EFFECT UNTIL 10 PM EDT THIS EVENING...
Tonight...Sw Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 4 To 5 Ft. Wave Detail: S 5 Ft At 7 Seconds. Showers And Tstms Likely Until Early Morning, Then A Chance Of Showers And Tstms Late. Patchy Fog After Midnight. Vsby 1 To 3 Nm.
Thu...Sw Winds 5 To 10 Kt. Seas 3 To 4 Ft. Wave Detail: S 4 Ft At 8 Seconds. Patchy Fog In The Morning. A Chance Of Showers.
Thu Night...Sw Winds Around 5 Kt, Becoming N After Midnight. Seas 3 To 4 Ft. Wave Detail: S 4 Ft At 8 Seconds. A Chance Of Showers In The Evening. Patchy Fog.
Fri...N Winds Around 10 Kt, Becoming E In The Afternoon. Seas 2 To 4 Ft. Wave Detail: S 4 Ft At 8 Seconds.
Fri Night...S Winds Around 5 Kt. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 7 Seconds.
Sat...S Winds Around 5 Kt, Increasing To 5 To 10 Kt In The Afternoon. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 7 Seconds.
Sat Night...S Winds 5 To 10 Kt, Becoming Sw After Midnight. Seas 2 To 3 Ft. A Chance Of Showers After Midnight.
Sun...Nw Winds Around 5 Kt, Becoming S In The Afternoon. Seas 2 To 3 Ft. A Chance Of Showers In The Morning.
Sun Night...Sw Winds 5 To 10 Kt. Seas 2 To 3 Ft.
Mon...S Winds Around 5 Kt. Seas 2 To 3 Ft. A Chance Of Showers In The Afternoon.
Mon Night...S Winds Around 5 Kt. Seas 2 To 3 Ft. A Chance Of Showers And Tstms. Winds And Seas Higher In And Near Tstms.
SHARE THIS PAGE:           
Area Forecast Discussion
National Weather Service Mount Holly NJ
730pm EDT Wednesday July 17 2024

Synopsis
A strong cold front will cross the Middle Atlantic region tonight. It will be followed by high pressure for the end of the week and into the weekend. Another upper system and surface front will arrive by early next week.

Near Term - Through Thursday
A line of loosely organized convection has now formed across eastern PA down into the Chesapeake Bay. While there remains sufficient instability and shear to support some severe wind potential, storms are beginning to struggle with some organization, at least across these areas that already saw some convective development earlier in the day. More abundant instability is available across southern NJ and the Delmarva, so storms still have an opportunity to strengthen over the next few hours. The onset of nighttime, however, will help diminish our severe potential gradually over the next few hours. PWAT (Precipitable Water) values over 2 inches remain across the region and continue to support heavy downpours leading to localized flash flooding. Storms should eventually give way to just some residual showers before tapering off from northwest to southeast overnight as the cold front shifts further offshore. Behind the front, light NW winds and temperatures falling into the upper 60s to low 70s. Some patchy fog will be possible as well.

The cold front should fully cross through the region by Thursday morning but will begin to slow down as it passes to our south and east. So while, the northern half of the area will begin to see some clearing, the southern half of the area (especially near the coast), will see cloud cover linger throughout the day. Isolated to scattered showers and storms may hang up along the southern Jersey shore and southern Delmarva in the afternoon. On the bright side, this cold front will knock down temps and humidity with highs mainly in the mid 80s.

.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/... Front will continue slowly sliding southeastward away from the area Thursday night. A few showers or thunderstorms may linger in the evening across southern Delaware but it should clear out after midnight. Lows will be in the considerably more comfortable 60s for most of the area.

Friday looks like the most pleasant day of the forecast as Canadian high pressure briefly builds southward into the area. Dew points will be down into the upper 50s and lower 60s with highs only in the mid to upper 80s with mostly sunny skies and light winds.

High pressure starts to push eastward with a lee-side trough developing on Saturday. With winds turning back to the south, dew points will start to creep back up. The increased moisture plus lee side trough combined with a weak upper disturbance working in from the southwest may be enough to bring some scattered showers and isolated thunderstorms by afternoon, especially west and southwest of Philly. Further north and east, dry conditions should prevail. While dew points will be back solidly into the 60s, highs should remain mostly in the upper 80s, so still considerably more comfortable than recent days, but not quite as nice as Friday.

Long Term - Saturday Night Through Wednesday
The stalled front to our south will gradually creep back northward as we head into the middle of next week. Combined with passing upper disturbances, this should result in a general turn towards cloudier, more showery weather, with lower temps by mid week.

At first however, Sunday should be similar to Saturday, with some spotty convection possible mainly west and southwest of Philly. Dew points keep creeping up, but temps remain in the upper 80s overall.

By Monday the increased moisture is more apparent, as dews start to approach 70 and the front starts to push back north. This should result in a slightly better chance of convection, but again, not huge. Still mainly upper 80s for highs.

Tuesday and Wednesday are when conditions turn wetter, with the front pushing back into the area with clouds and scattered showers/t- storms becoming common. This will cause cooler temps as well, with highs down into the mid 80s, but dew points rising into the low-mid 70s. Will need to monitor for any locally heavy rain risks given high moisture and slow moving front in the vicinity, but overall this looks like a beneficial change in the weather.

Marine
Small Craft Advisory in effect through Thursday morning for all coastal waters with SSW winds 20 knots gusting up to 25 knots with seas around 5 feet. There will also be some storms moving over the waters that could bring locally stronger winds potentially gusting over 40 knots.

By Thursday, winds/seas should be sub SCA (Small Craft Advisory) but there still could be some lingering showers and storms over the waters.

Outlook... Thursday night through Monday...Conditions will generally be below Small Craft Advisory criteria. Wind gusts of 15 kt or less with wave heigheights of 4 feet or less. Slight chance showers and thunderstorms, mainly in the afternoon and evening hours.

Rip currents... For Thursday, winds will turn more offshore out of the west to northwest and decrease to around 10 mph. Wave heigheights will mainly be around 1-2 feet in Delaware and 2-3 feet in New Jersey with a 7-8 second period. As the winds should be weaker and directed offshore across the region, the risk for the development of dangerous and life threatening rip currents is forecast to be LOW at the DE beaches and MODERATE at the NJ shore on Thursday.

For Friday, winds will become northeasterly but remain around 10 mph. Wave heigheights will mainly remain around 1-2 feet in Delaware and 2-3 feet in New Jersey with a 7-8 second period. Therefore, the risk for the development of dangerous and life threatening rip currents is forecast to be LOW at the DE beaches and MODERATE at the NJ shore on Friday.

For specific beach forecasts, visit weather.gov/beach/phi

NOAA Mount Holly NJ Office: Watches - Warnings - Advisories
PA...

Excessive Heat Warning...til 8pm EDT this evening for PAZ060>062-070-071-101>106.
Heat Advisory until 8pm EDT this evening for PAZ054-055. NJ...

Excessive Heat Warning...til 8pm EDT this evening for NJZ007>010-012-013-015>023-027.
Heat Advisory until 8pm EDT this evening for NJZ001-014.
Air Quality Alert until 11pm EDT this evening for NJZ012>015- 017>019. DE...

Excessive Heat Warning...til 8pm EDT this evening for DEZ001>003.
Heat Advisory until 8pm EDT this evening for DEZ004. MD...

Excessive Heat Warning...til 8pm EDT this evening for MDZ012- 015-019-020.

Marine
Small Craft Advisory until 8am EDT Thursday for ANZ450>455.