Alert archive / New Jersey / Special Marine Warnings in 2020

Special Marine Warning 21, NWS Philadelphia/Mount Holly

April 21, 2020

NWS Philadelphia/Mount Holly issued this special marine warning at Apr 21, 2020, 3:04 PM EDT. It was in force for 116 min. 13 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 21, 2020, 3:04 PM EDT (19:04 UTC)
Expired: Apr 21, 2020, 5:00 PM EDT
In force: 116 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 40.0 mph

What was reported inside it

Time	Report	Where	Remark
Apr 21, 3:04 PM EDT	TSTM WND DMG	1 Nw Brielle, NJ	DOWNED UTILITY POLE ON STATE HIGHWAY 35 SOUTH OF LAKEWOOD ROAD. TIME ESTIMATED FROM RADAR.
Apr 21, 3:04 PM EDT	TSTM WND DMG	3 N Ocean Gate, NJ	TREE DOWN ON STANDISH DR. IN BELLCREST AREA OF TOMS RIVER. TIME ESTIMATED FROM RADAR.
Apr 21, 3:04 PM EDT	TSTM WND DMG	Manasquan, NJ	SEVERAL REPORTS OF TREES AND WIRES DOWN NEAR AND WEST OF MANASQUAN. TIME ESTIMATED FROM RADAR.
Apr 21, 3:04 PM EDT	HAIL 0.5	1 E Brielle, NJ	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Apr 21, 3:25 PM EDT	TSTM WND DMG	Seaville, NJ	TREE DOWN, TRANSFORMERS BLOWN.
Apr 21, 3:26 PM EDT	TSTM WND DMG	Somers Point, NJ	SEVERAL REPORTS OF POWER LINES DOWN IN THE AREA. TIME ESTIMATED FROM RADAR.
Apr 21, 3:27 PM EDT	TSTM WND GST 69	1 Ene Cape May Point, NJ
Apr 21, 3:28 PM EDT	TSTM WND GST 40	Barnegat Light, NJ	BARNEGAT LIGHT MEASURES A 40 MPH WIND GUST.
Apr 21, 3:29 PM EDT	TSTM WND GST 48	2 Ese Beesleys Point, NJ	OCEAN CITY AIRPORT MEASURES A 48 MPH WIND GUST.
Apr 21, 3:29 PM EDT	TSTM WND GST 52	5 Se Mystic Island, NJ	LITTLE EGG INLET MEASURES A 52 MPH WIND GUST.
Apr 21, 3:29 PM EDT	TSTM WND GST 58	2 Sw Beach Haven, NJ	BEACH HAVEN MESONET MEASURES 58 MPH WIND GUST.
Apr 21, 3:30 PM EDT	TSTM WND DMG	Little Egg Harbor Twp, NJ	SEVERAL REPORTS OF STRUCTURAL DAMAGE IN LITTLE EGG HARBOR. TIME ESTIMATED FROM RADAR.
Apr 21, 3:35 PM EDT	TSTM WND DMG	Cape May, NJ	SEVERAL REPORTS OF DOWNED POWER LINES. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.1 hours before the alert went out and 195 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 846 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 296 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

223 
WHUS51 KPHI 211904
SMWPHI
ANZ430-431-450>455-470>473-475-212100-
/O.NEW.KPHI.MA.W.0021.200421T1904Z-200421T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
304 PM EDT Tue Apr 21 2020

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  Delaware Bay...
  Coastal and outer waters from Sandy Hook NJ to Fenwick Island DE...

* Until 500 PM EDT.

* At 304 PM EDT, severe thunderstorms capable of producing
  waterspouts were located along a line extending from Sandy Hook to
  9 nm north of Buoy Ge to 10 nm northeast of Bivalve, moving east at
  25 knots.

  HAZARD...Waterspouts, wind gusts to 40 knots, and small hail.

  SOURCE...Radar.

  IMPACT...Waterspouts can easily overturn boats and create locally 
           hazardous seas. Small craft could be damaged in briefly 
           higher winds and suddenly higher waves.

* Locations impacted include...
  Atlantic City, Buoy 2fb, Buoy 4fb, Atlantic Highlands, Slaughter
  Beach, Deepwater Reef, Garden State South Reef, Axel Carlson Reef,
  Great Egg Reef, Ocean City Reef, Indian River Inlet Bridge, Point
  Pleasant Beach, Seaside Park, Brigantine, Bethany Beach, Ocean
  Gate, Little Egg Reef, Atlantic City Reef, Great Egg Inlet and
  Rehoboth Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4024 7363 3997 7339 3966 7331 3900 7372
      3870 7415 3851 7426 3822 7432 3856 7533
      3875 7520 3892 7539 3931 7492 3923 7495
      3915 7481 3938 7463 3970 7426 4027 7405
      4035 7414 4042 7405 4040 7398 4044 7399
TIME...MOT...LOC 1904Z 288DEG 25KT 4047 7399 3943 7470 3846 7580 

WATERSPOUT...POSSIBLE
HAIL...<.75IN
WIND...40KTS

$$

Davis

6 follow-up statements

950 
FZUS71 KPHI 211936
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
336 PM EDT Tue Apr 21 2020

ANZ430-211942-
/O.CAN.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
336 PM EDT Tue Apr 21 2020

...THE SPECIAL MARINE WARNING IS CANCELLED...

The affected areas were...
Upper Delaware Bay...

The thunderstorms have moved out of the warned area and no longer 
pose a significant threat to boaters.

A Severe Thunderstorm Watch remains in effect until 500 PM EDT for
southern Delaware...southern and central New Jersey...and the
adjacent coastal waters.

LAT...LON 4024 7363 4006 7347 3996 7339 3966 7331
      3900 7372 3870 7415 3851 7426 3822 7432
      3856 7533 3875 7520 3886 7526 3920 7490
      3915 7481 3938 7463 3970 7426 4027 7405
      4035 7414 4042 7405 4040 7398 4044 7399
TIME...MOT...LOC 1932Z 288DEG 25KT 4041 7375 3937 7447 3840 7557 

$$

ANZ431-450>455-470>473-475-212100-
/O.CON.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
336 PM EDT Tue Apr 21 2020

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 500 PM EDT...

For the following areas...
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm...
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm...
Delaware Bay waters south of East Point NJ to Slaughter Beach DE...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...
Waters from Little Egg Inlet NJ to Great Egg Inlet NJ out 20 to 40 nm
from 20 to 40 NM...
Waters from Manasquan Inlet NJ to Little Egg Inlet NJ out 20 to 40
nm...
Waters from Sandy Hook NJ to Manasquan Inlet NJ out 20 to 40 nm...

At 332 PM EDT, severe thunderstorms producing waterspouts were
located along a line extending from 8 nm east of Sandy Hook Reef to
Atlantic City to 16 nm east of Bivalve, moving east at 25 knots.

HAZARD...Waterspouts, wind gusts to 40 knots, and small hail.

SOURCE...Public video of a waterspout near Normandy Beach, NJ. 

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

Locations impacted include...
Atlantic City, Buoy 2fb, Buoy 4fb, Atlantic Highlands, Deepwater
Reef, Garden State South Reef, Axel Carlson Reef, Great Egg Reef,
Ocean City Reef, Indian River Inlet Bridge, Point Pleasant Beach,
Seaside Park, Brigantine, Bethany Beach, Ocean Gate, Little Egg Reef,
Atlantic City Reef, Great Egg Inlet, Rehoboth Beach and Cape May
Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

Move to safe harbor until hazardous weather passes.

Thunderstorms can produce sudden waterspouts. Waterspouts can easily
overturn boats and create locally hazardous seas. Seek safe harbor
immediately.

&&

LAT...LON 4024 7363 4006 7347 3996 7339 3966 7331
      3900 7372 3870 7415 3851 7426 3822 7432
      3856 7533 3875 7520 3886 7526 3920 7490
      3915 7481 3938 7463 3970 7426 4027 7405
      4035 7414 4042 7405 4040 7398 4044 7399
TIME...MOT...LOC 1932Z 288DEG 25KT 4041 7375 3937 7447 3840 7557 

WATERSPOUT...OBSERVED
HAIL...<.75IN
WIND...40KTS

$$

Davis

014 
FZUS71 KPHI 211953
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
353 PM EDT Tue Apr 21 2020

ANZ431-212001-
/O.CAN.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
353 PM EDT Tue Apr 21 2020

...THE SPECIAL MARINE WARNING IS CANCELLED...

The affected areas were...
Lower Delaware Bay...

The thunderstorms have moved out of the warned area and no longer 
pose a significant threat to boaters.

A Severe Thunderstorm Watch remains in effect until 500 PM EDT for
southern Delaware...southern and central New Jersey...and the
adjacent coastal waters.

LAT...LON 4024 7363 4006 7347 3966 7331 3900 7372
      3870 7415 3822 7432 3856 7533 3875 7520
      3886 7526 3887 7525 3880 7518 3878 7511
      3893 7497 3917 7491 3918 7492 3919 7478
      3970 7426 4027 7405 4035 7414 4044 7399
TIME...MOT...LOC 1951Z 288DEG 25KT 4037 7359 3933 7431 3836 7541 

$$

ANZ450>455-470>473-475-212100-
/O.CON.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
353 PM EDT Tue Apr 21 2020

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 500 PM EDT...

For the following areas...
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm...
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...
Waters from Little Egg Inlet NJ to Great Egg Inlet NJ out 20 to 40 nm
from 20 to 40 NM...
Waters from Manasquan Inlet NJ to Little Egg Inlet NJ out 20 to 40
nm...
Waters from Sandy Hook NJ to Manasquan Inlet NJ out 20 to 40 nm...

At 351 PM EDT, severe thunderstorms producing waterspouts were
located along a line extending from 14 nm south of Barnum Island to
near Atlantic City Reef to 15 nm west of Ocean City Inlet, moving
east at 25 knots.

HAZARD...Waterspouts, wind gusts to 40 knots, and small hail.

SOURCE...Public video of a waterspout near Normandy Beach, NJ. 

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

Locations impacted include...
Atlantic City, Buoy 2fb, Buoy 4fb, Atlantic Highlands, Deepwater
Reef, Garden State South Reef, Axel Carlson Reef, Great Egg Reef,
Ocean City Reef, Indian River Inlet Bridge, Point Pleasant Beach,
Seaside Park, Brigantine, Bethany Beach, Ocean Gate, Little Egg Reef,
Atlantic City Reef, Great Egg Inlet, Rehoboth Beach and Sea Bright.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

Move to safe harbor until hazardous weather passes.

Thunderstorms can produce sudden waterspouts. Waterspouts can easily
overturn boats and create locally hazardous seas. Seek safe harbor
immediately.

&&

LAT...LON 4024 7363 4006 7347 3966 7331 3900 7372
      3870 7415 3822 7432 3856 7533 3875 7520
      3886 7526 3887 7525 3880 7518 3878 7511
      3893 7497 3917 7491 3918 7492 3919 7478
      3970 7426 4027 7405 4035 7414 4044 7399
TIME...MOT...LOC 1951Z 288DEG 25KT 4037 7359 3933 7431 3836 7541 

WATERSPOUT...OBSERVED
HAIL...<.75IN
WIND...40KTS

$$

Davis

503 
FZUS71 KPHI 212009
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
409 PM EDT Tue Apr 21 2020

ANZ450-470-212018-
/O.CAN.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
409 PM EDT Tue Apr 21 2020

...THE SPECIAL MARINE WARNING IS CANCELLED...

The affected areas were...

Coastal and outer waters from Sandy Hook to Manasquan Inlet NJ...

The thunderstorms have moved out of the warned area and no longer 
pose a significant threat to boaters.

LAT...LON 3847 7507 3877 7475 3916 7449 3972 7385
      3988 7362 3966 7331 3900 7372 3870 7415
      3858 7419 3851 7426 3838 7426 3822 7432
TIME...MOT...LOC 2008Z 288DEG 25KT 4033 7345 3929 7417 3833 7527 

$$

ANZ451>455-471>473-475-212100-
/O.CON.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
409 PM EDT Tue Apr 21 2020

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 500 PM EDT...

For the following areas...
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm...
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...
Waters from Little Egg Inlet NJ to Great Egg Inlet NJ out 20 to 40 nm
from 20 to 40 NM...
Waters from Manasquan Inlet NJ to Little Egg Inlet NJ out 20 to 40
nm...

At 408 PM EDT, severe thunderstorms producing waterspouts were
located along a line extending from 17 nm northeast of Shark River
Reef to near Atlantic City Reef to 8 nm west of Ocean City Inlet,
moving east at 25 knots.

HAZARD...Waterspouts, wind gusts to 40 knots, and small hail.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

Locations impacted include...
28-Mile Wreck, Five Fathoms Buoy, Buoy 2fb, Atlantic City Reef, Buoy
4fb, Deepwater Reef, Delaware Lightship Buoy 44009, Great Egg Reef
and Fenwick Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

Move to safe harbor until hazardous weather passes.

Thunderstorms can produce sudden waterspouts. Waterspouts can easily
overturn boats and create locally hazardous seas. Seek safe harbor
immediately.

&&

LAT...LON 3847 7507 3877 7475 3916 7449 3972 7385
      3988 7362 3966 7331 3900 7372 3870 7415
      3858 7419 3851 7426 3838 7426 3822 7432
TIME...MOT...LOC 2008Z 288DEG 25KT 4033 7345 3929 7417 3833 7527 

WATERSPOUT...OBSERVED
HAIL...<.75IN
WIND...40KTS

$$

Davis

781 
FZUS71 KPHI 212043
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
443 PM EDT Tue Apr 21 2020

ANZ451>455-471-212052-
/O.CAN.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
443 PM EDT Tue Apr 21 2020

...THE SPECIAL MARINE WARNING IS CANCELLED...

The affected areas were...

Coastal waters from Manasquan Inlet NJ to Fenwick Island DE out 20
nm...
Outer waters from Manasquan Inlet to Little Egg Inlet NJ out 20 to 40
nm...

The thunderstorms have moved out of the warned area and no longer 
pose a significant threat to boaters.

LAT...LON 3836 7472 3862 7453 3896 7421 3920 7382
      3920 7360 3900 7372 3870 7415 3858 7419
      3851 7426 3838 7426 3822 7432
TIME...MOT...LOC 2042Z 288DEG 25KT 4026 7316 3922 7388 3826 7498 

$$

ANZ472-473-475-212100-
/O.CON.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
443 PM EDT Tue Apr 21 2020

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 500 PM EDT...

For the following areas...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...
Waters from Little Egg Inlet NJ to Great Egg Inlet NJ out 20 to 40 nm
from 20 to 40 NM...

At 442 PM EDT, severe thunderstorms producing waterspouts were
located along a line extending from 25 nm east of Shark River Reef to
18 nm east of Atlantic City Reef to near 10 Nm East Of Ocean City
Inlet, moving east at 25 knots.

HAZARD...Waterspouts, wind gusts to 40 knots, and small hail.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

The severe thunderstorms will remain over mainly open waters.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

Thunderstorms can produce sudden waterspouts. Waterspouts can easily
overturn boats and create locally hazardous seas. Seek safe harbor
immediately.

&&

LAT...LON 3836 7472 3862 7453 3896 7421 3920 7382
      3920 7360 3900 7372 3870 7415 3858 7419
      3851 7426 3838 7426 3822 7432
TIME...MOT...LOC 2042Z 288DEG 25KT 4026 7316 3922 7388 3826 7498 

WATERSPOUT...OBSERVED
HAIL...<.75IN
WIND...40KTS

$$

Davis

153 
FZUS71 KPHI 212049
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
449 PM EDT Tue Apr 21 2020

ANZ472-212058-
/O.CAN.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
449 PM EDT Tue Apr 21 2020

...THE SPECIAL MARINE WARNING IS CANCELLED...

The affected areas were...

Outer waters from Little Egg Inlet to Great Egg Inlet NJ out 20 to 40
nm...

The thunderstorms have moved out of the warned area and no longer 
pose a significant threat to boaters.

LAT...LON 3834 7466 3856 7452 3888 7416 3883 7397
      3870 7415 3858 7419 3851 7426 3838 7426
      3822 7432
TIME...MOT...LOC 2048Z 288DEG 25KT 4025 7311 3921 7383 3825 7493 

$$

ANZ473-475-212100-
/O.CON.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
449 PM EDT Tue Apr 21 2020

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 500 PM EDT...

For the following areas...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...

At 448 PM EDT, severe thunderstorms producing waterspouts were
located along a line extending from 27 nm east of Shark River Reef to
20 nm east of Atlantic City Reef to near 10 Nm East Of Ocean City
Inlet, moving east at 25 knots.

HAZARD...Waterspouts, wind gusts to 40 knots, and small hail.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

The severe thunderstorms will remain over mainly open waters.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

Move to safe harbor until hazardous weather passes.

Thunderstorms can produce sudden waterspouts. Waterspouts can easily
overturn boats and create locally hazardous seas. Seek safe harbor
immediately.

&&

LAT...LON 3834 7466 3856 7452 3888 7416 3883 7397
      3870 7415 3858 7419 3851 7426 3838 7426
      3822 7432
TIME...MOT...LOC 2048Z 288DEG 25KT 4025 7311 3921 7383 3825 7493 

WATERSPOUT...OBSERVED
HAIL...<.75IN
WIND...40KTS

$$

Davis

538 
FZUS71 KPHI 212054
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
454 PM EDT Tue Apr 21 2020

ANZ473-475-212104-
/O.EXP.KPHI.MA.W.0021.000000T0000Z-200421T2100Z/
454 PM EDT Tue Apr 21 2020

...THE SPECIAL MARINE WARNING WILL EXPIRE AT 500 PM EDT...

The affected areas were... 

Outer waters from Great Egg Inlet NJ to Fenwick Island DE out 20 to
40 nm...

The thunderstorms have moved out of the warned area and no longer 
pose a significant threat to boaters.

LAT...LON 3834 7466 3856 7452 3888 7416 3883 7397
      3870 7415 3858 7419 3851 7426 3838 7426
      3822 7432
TIME...MOT...LOC 2054Z 288DEG 25KT 4024 7307 3920 7379 3824 7489 

$$

Davis

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 21, 3:34 AM EDT	Freeze Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	28 hr
Apr 21, 11:44 AM EDT	Coastal Flood Statement	PHI	Ocean	5 hr
Apr 21, 12:23 PM EDT	Special Weather Statement	PHI	Monmouth	37 min
Apr 21, 1:04 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	26 min
Apr 21, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Hunterdon, Mercer, Middlesex, Morris and 1 more	32 min
Apr 21, 1:38 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	52 min
Apr 21, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	56 min
Apr 21, 1:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Hunterdon, Mercer, Middlesex, Monmouth and 3 more	61 min
Apr 21, 2:04 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	56 min
Apr 21, 2:17 PM EDT	Special Marine Warning	PHI		58 min
Apr 21, 2:24 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	66 min
Apr 21, 2:55 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	35 min
Apr 21, 12:48 PM EDT	Special Weather Statement	PHI	Bucks, Chester, Montgomery	42 min
Apr 21, 2:46 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	74 min

Nearby

Special Marine Warnings in New Jersey, 2020 Every special marine warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.