Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 47, NWS Philadelphia/Mount Holly

June 15, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jun 15, 2021, 1:00 AM EDT. It was in force for 88 min. 2 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: Jun 15, 2021, 1:00 AM EDT (05:00 UTC)
Expired: Jun 15, 2021, 2:28 AM EDT
In force: 88 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

The radar

The Dover AFB radar (KDOX), 63 km from the middle of the area, began a volume at 05:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jun 15, 1:05 AM EDT	MARINE TSTM WIND 42	1 Ssw North Cape May, NJ	42 MPH GUST AT THE CAPE MAY WEATHERFLOW SITE IN LOWER TOWNSHIP.
Jun 15, 1:15 AM EDT	MARINE TSTM WIND 42	North Wildwood, NJ	42 MPH GUST AT NORTH WILDWOOD SENSOR.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 5.0 hours before the alert went out and 139 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: 464 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 989 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

904 
WHUS51 KPHI 150500
SMWPHI
ANZ431-451>455-471>473-475-150700-
/O.NEW.KPHI.MA.W.0047.210615T0500Z-210615T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
100 AM EDT Tue Jun 15 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  Lower Delaware Bay...
  Coastal and outer waters from Manasquan Inlet to Fenwick Island
  DE...

* Until 300 AM EDT.

* At 100 AM EDT, strong thunderstorms were located along a line
  extending from 8 nm northwest of Great Egg Inlet to 7 nm southeast
  of East Point to 8 nm west of Rehoboth Beach, moving east at 20
  knots.

  HAZARD...Wind gusts 34 knots or greater.

  SOURCE...Radar.

  IMPACT...Small craft could be damaged in briefly higher winds and 
           suddenly higher waves.

* Locations impacted include...
  Atlantic City, Five Fathoms Buoy, Buoy 2fb, Brown Shoal Light, Buoy
  4fb, Buoy 3fb, Cape Henlopen, Deepwater Reef, Garden State South
  Reef, Great Egg Reef, Ocean City Reef, Indian River Inlet Bridge,
  Overfalls Shoal, The Lump, 28-
  Mile Wreck, Brigantine, Little Egg Reef, Atlantic City Reef, Great
  Egg Inlet and Rehoboth Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor immediately as gusty winds and high waves are
expected.

&&

LAT...LON 3850 7462 3863 7531 3864 7524 3872 7524
      3876 7521 3876 7529 3921 7488 3915 7481
      3920 7477 3925 7478 3927 7482 3945 7466
      3938 7466 3938 7463 3947 7450 3953 7456
      3968 7356
TIME...MOT...LOC 0500Z 259DEG 19KT 3943 7465 3913 7489 3872 7526 

HAIL...0.00IN
WIND...>34KTS

$$

Staarmann

4 follow-up statements

097 
FZUS71 KPHI 150515
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
115 AM EDT Tue Jun 15 2021

ANZ431-451>455-471>473-475-150700-
/O.CON.KPHI.MA.W.0047.000000T0000Z-210615T0700Z/
115 AM EDT Tue Jun 15 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 300 AM 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...
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...

At 115 AM EDT, strong thunderstorms were located along a line
extending from near Atlantic City to Sea Isle City to Rehoboth Beach,
moving east at 25 knots.

HAZARD...Wind gusts to 40 knots.

SOURCE...Radar indicated.

IMPACT...Small craft could be damaged in briefly higher winds and 
         suddenly higher waves.

Locations impacted include...
Atlantic City, Five Fathoms Buoy, Buoy 2fb, Brown Shoal Light, Buoy
4fb, Buoy 3fb, Cape Henlopen, Deepwater Reef, Garden State South
Reef, Great Egg Reef, Ocean City Reef, Indian River Inlet Bridge,
Overfalls Shoal, The Lump, 28-
Mile Wreck, Brigantine, Little Egg Reef, Atlantic City Reef, Great
Egg Inlet and Rehoboth Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor immediately as gusty winds and high waves are
expected.

&&

LAT...LON 3850 7462 3863 7531 3864 7524 3872 7524
      3876 7521 3876 7529 3921 7488 3915 7481
      3920 7477 3925 7478 3927 7482 3945 7466
      3938 7466 3938 7463 3947 7450 3953 7456
      3968 7356
TIME...MOT...LOC 0515Z 262DEG 26KT 3942 7445 3915 7469 3874 7506 

HAIL...0.00IN
WIND...40KTS

$$

Staarmann

140 
FZUS71 KPHI 150527
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
127 AM EDT Tue Jun 15 2021

ANZ431-451>455-471>473-475-150700-
/O.CON.KPHI.MA.W.0047.000000T0000Z-210615T0700Z/
127 AM EDT Tue Jun 15 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 300 AM 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...
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...

At 126 AM EDT, strong thunderstorms were located along a line
extending from near Brigantine to near Ocean City Reef to near 
Rehoboth Beach, moving east at 25 knots. A few measured gusts of 35 
to 40 knots have been observed with this line of storms.

HAZARD...Wind gusts to 40 knots.

SOURCE...Radar indicated.

IMPACT...Small craft could be damaged in briefly higher winds and 
         suddenly higher waves.

Locations impacted include...
Atlantic City, Five Fathoms Buoy, Buoy 2fb, Buoy 4fb, Buoy 3fb,
Garden State South Reef, Great Egg Reef, Ocean City Reef, Indian
River Inlet Bridge, Overfalls Shoal, The Lump, 28-
Mile Wreck, Brigantine, Little Egg Reef, Atlantic City Reef, Great
Egg Inlet, Rehoboth Beach, Cape May Point, Wildwood and Beach Haven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor immediately as gusty winds and high waves are
expected.

&&

LAT...LON 3850 7462 3860 7514 3886 7506 3955 7439
      3968 7357
TIME...MOT...LOC 0526Z 264DEG 25KT 3940 7430 3915 7456 3875 7498 

HAIL...0.00IN
WIND...40KTS

$$

Staarmann

846 
FZUS71 KPHI 150540
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
140 AM EDT Tue Jun 15 2021

ANZ431-150549-
/O.CAN.KPHI.MA.W.0047.000000T0000Z-210615T0700Z/
140 AM EDT Tue Jun 15 2021

...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 200 AM EDT for
southern Delaware...and southern New Jersey.

LAT...LON 3850 7462 3859 7507 3895 7491 3920 7459
      3957 7425 3968 7357
TIME...MOT...LOC 0539Z 262DEG 30KT 3943 7408 3910 7448 3871 7472 

$$

ANZ451>455-471>473-475-150700-
/O.CON.KPHI.MA.W.0047.000000T0000Z-210615T0700Z/
140 AM EDT Tue Jun 15 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 300 AM 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 139 AM EDT, strong thunderstorms were located along a line
extending from 6 nm southeast of Little Egg Reef to 6 nm southeast of
Ocean City Reef to 7 nm southwest of Five Fathoms Buoy, moving east 
at 30 knots. A few measured gusts of 35 to 40 knots have been 
observed with this line of storms, but stronger winds may be 
possible offshore.

HAZARD...Wind gusts to nearly 50 knots.

SOURCE...Coast Guard.

IMPACT...Small craft could be damaged in briefly higher winds and 
         suddenly higher waves.

Locations impacted include...
Five Fathoms Buoy, Buoy 2fb, Little Egg Reef, Atlantic City Reef,
Buoy 4fb, Buoy 3fb, Garden State South Reef, Great Egg Reef, Ocean
City Reef, Wildwood, Beach Haven, The Lump, 28-
Mile Wreck, Cape May Reef, Brigantine, Buoy 2ms, Wildwood Reef,
Little Egg Inlet, Deepwater Reef and Atlantic City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor immediately as gusty winds and high waves are
expected.

&&

LAT...LON 3850 7462 3859 7507 3895 7491 3920 7459
      3957 7425 3968 7357
TIME...MOT...LOC 0539Z 262DEG 30KT 3943 7408 3910 7448 3871 7472 

HAIL...0.00IN
WIND...49KTS

$$

Staarmann

383 
FZUS71 KPHI 150628
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
228 AM EDT Tue Jun 15 2021

ANZ451>455-471>473-475-150638-
/O.CAN.KPHI.MA.W.0047.000000T0000Z-210615T0700Z/
228 AM EDT Tue Jun 15 2021

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

The affected areas were... 

Coastal and outer waters from Manasquan Inlet to Fenwick Island DE...

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

LAT...LON 3850 7462 3859 7507 3895 7491 3920 7459
      3957 7425 3968 7357
TIME...MOT...LOC 0624Z 259DEG 19KT 3947 7378 3915 7418 3876 7442 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 14, 8:08 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	52 min
Jun 14, 8:34 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	41 min
Jun 14, 8:55 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester	50 min
Jun 14, 9:11 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 1 more	49 min
Jun 14, 9:12 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 1 more	74 min
Jun 14, 9:17 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	3 hr
Jun 14, 9:29 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	46 min
Jun 14, 9:54 PM EDT	Areal Flood Advisory	PHI	Monmouth	97 min
Jun 14, 9:58 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	32 min
Jun 14, 10:01 PM EDT	Special Marine Warning	PHI		89 min
Jun 14, 10:07 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	53 min
Jun 14, 10:51 PM EDT	Special Marine Warning	PHI		114 min
Jun 14, 11:07 PM EDT	Special Marine Warning	PHI		113 min
Jun 14, 11:21 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	39 min
Jun 14, 11:42 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester, Salem	63 min
Jun 14, 11:47 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean, Salem	118 min
Jun 15, 12:04 AM EDT	Special Marine Warning	PHI		116 min
Jun 15, 12:12 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Gloucester	51 min
Jun 14, 11:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent	63 min
Jun 14, 11:39 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	85 min
Jun 14, 11:51 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	54 min
Jun 14, 11:54 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	66 min

Nearby

Special Marine Warnings in New Jersey, 2021 Every special marine warning in 2021

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; radar from the NEXRAD Level II archive.