Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 7, NWS Philadelphia/Mount Holly

March 28, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Mar 28, 2021, 7:38 PM EDT. It was in force for 111 min. 4 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: Mar 28, 2021, 7:38 PM EDT (23:38 UTC)
Expired: Mar 28, 2021, 9:29 PM EDT
In force: 111 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.0 in
Wind: 50.0 mph

The radar

The Philadelphia radar (KDIX), 23 km from the middle of the area, began a volume at 23:40 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
Mar 28, 7:54 PM EDT	TSTM WND DMG	Atlantic Highlands, NJ	SEVERAL REPORTS OF DOWNED TREE LIMBS AND POWER LINES IN THE ATLANTIC HIGHLANDS AREA. TIME ESTIMATED FROM RADAR.
Mar 28, 7:56 PM EDT	TSTM WND DMG	1 Wsw Oakhurst, NJ	DOWNED TREES AND WIRES NEAR LINCOLN AVENUE. TIME ESTIMATED FROM RADAR.
Mar 28, 8:12 PM EDT	MARINE TSTM WIND 42	5 Se Mystic Island, NJ	HADS SENSOR.
Mar 28, 8:16 PM EDT	MARINE TSTM WIND 43	2 Sw Beach Haven, NJ

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, 11.6 hours before the alert went out and 159 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

100 
WHUS51 KPHI 282338
SMWPHI
ANZ450>452-470>472-290145-
/O.NEW.KPHI.MA.W.0007.210328T2338Z-210329T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
738 PM EDT Sun Mar 28 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  
Coastal and outer waters from Sandy Hook to Great Egg Inlet NJ...

* Until 945 PM EDT.

* At 738 PM EDT, severe thunderstorms were located along a line
  extending from near Cliffwood Beach to 17 nm west of Pine Beach to
  16 nm northwest of Buoy Ge, moving east at 50 knots.

  HAZARD...Wind gusts in excess of 50 knots.

  SOURCE...Radar.

  IMPACT...Boats could suffer significant structural damage in high 
           winds. Small craft could capsize in suddenly higher 
           waves.

* Locations impacted include...
  Sea Girt Reef, Atlantic City, Ship Bottom, Atlantic Highlands,
  Garden State South Reef, Axel Carlson Reef, Silverton, Harvey
  Cedars, Lavallette, Barnegat Light, North Beach Haven, Point
  Pleasant Beach, Seaside Park, Brigantine, Ocean Gate, Leonardo,
  Little Egg Reef, Atlantic City Reef, Great Egg Inlet and Barnegat
  Light Reef.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4044 7398 4026 7365 3986 7333 3956 7334
      3911 7364 3937 7499 3934 7480 3949 7473
      3938 7463 3947 7450 3960 7459 3960 7439
      3970 7426 3990 7420 3996 7425 4024 7405
      4035 7414 4042 7406 4040 7398
TIME...MOT...LOC 2338Z 261DEG 49KT 4042 7427 4001 7455 3951 7481 

HAIL...0.00IN
WIND...50KTS

$$

Staarmann

3 follow-up statements

817 
FZUS71 KPHI 290025
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
825 PM EDT Sun Mar 28 2021

ANZ450>452-470>472-290145-
/O.CON.KPHI.MA.W.0007.000000T0000Z-210329T0145Z/
825 PM EDT Sun Mar 28 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 945 PM EDT...

For the following areas...
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 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 825 PM EDT, showers were located along a line extending from near
Entrance to New York Harbor to 6 nm east of Barnegat Light Reef to
near Atlantic City Reef, moving east at 45 knots.

HAZARD...Wind gusts to nearly 50 knots.

SOURCE...Radar indicated.

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

Locations impacted include...
Garden State North Reef, Little Egg Reef, Shark River Reef, Atlantic
City Reef, Barnegat Light Reef, Brigantine, Garden State South Reef
and Atlantic City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3956 7334 3912 7363 3928 7452 3972 7406
      4000 7400 4023 7385 4028 7369 4028 7368
      3986 7333
TIME...MOT...LOC 0025Z 267DEG 47KT 4029 7363 3982 7389 3929 7432 

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

$$

Staarmann

527 
FZUS71 KPHI 290054
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
854 PM EDT Sun Mar 28 2021

ANZ450-290104-
/O.CAN.KPHI.MA.W.0007.000000T0000Z-210329T0145Z/
854 PM EDT Sun Mar 28 2021

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

The affected areas were...

Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm...

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

LAT...LON 3912 7363 3924 7412 3993 7356 3996 7341
      3986 7333 3956 7334
TIME...MOT...LOC 0054Z 256DEG 48KT 3986 7350 3933 7394 

$$

ANZ451-452-470>472-290145-
/O.CON.KPHI.MA.W.0007.000000T0000Z-210329T0145Z/
854 PM EDT Sun Mar 28 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 945 PM EDT...

For the following areas...
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 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 854 PM EDT, showers were located along a line extending from 18 nm
southeast of Shark River Reef to 15 nm southeast of Little Egg Reef,
moving east at 50 knots.

HAZARD...Wind gusts to nearly 50 knots.

SOURCE...Radar indicated.

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

The showers will remain over mainly open waters.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3912 7363 3924 7412 3993 7356 3996 7341
      3986 7333 3956 7334
TIME...MOT...LOC 0054Z 256DEG 48KT 3986 7350 3933 7394 

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

$$

Staarmann

934 
FZUS71 KPHI 290129
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
929 PM EDT Sun Mar 28 2021

ANZ451-452-470>472-290139-
/O.CAN.KPHI.MA.W.0007.000000T0000Z-210329T0145Z/
929 PM EDT Sun Mar 28 2021

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

The affected areas were... 

Coastal waters from Manasquan Inlet to Great Egg Inlet NJ out 20
nm...
Outer waters from Sandy Hook to Great Egg Inlet NJ out 20 to 40 nm...

The showers have weakened and no longer pose a significant threat to
boaters.

LAT...LON 3912 7363 3924 7412 3993 7356 3996 7341
      3986 7333 3956 7334
TIME...MOT...LOC 0128Z 261DEG 49KT 3993 7290 3940 7335 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 28, 2:39 AM EDT	Gale Warning	PHI		35 hr
Mar 28, 6:21 PM EDT	Special Marine Warning	PHI		54 min
Mar 28, 6:43 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren	47 min
Mar 28, 6:47 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Monmouth, Salem	43 min
Mar 28, 7:17 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	60 min
Mar 28, 7:20 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Monmouth, Ocean	70 min
Mar 28, 5:04 PM EDT	Special Weather Statement	PHI	Berks	41 min
Mar 28, 5:13 PM EDT	Special Weather Statement	PHI	Carbon	32 min
Mar 28, 5:45 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	30 min
Mar 28, 6:02 PM EDT	Special Weather Statement	PHI	Chester	28 min
Mar 28, 6:12 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	48 min
Mar 28, 6:15 PM EDT	Special Weather Statement	PHI	Montgomery	30 min
Mar 28, 7:54 PM EDT	Special Weather Statement	PHI	Sussex	36 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.