Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 59, NWS Philadelphia/Mount Holly

June 30, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jun 30, 2021, 9:51 PM EDT. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 30, 2021, 9:51 PM EDT (01:51 UTC)
Expired: Jun 30, 2021, 10:51 PM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

The radar

The Philadelphia radar (KDIX), 33 km from the middle of the area, began a volume at 01:53 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 1.9 hours before the alert went out and 140 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: 1308 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

941 
WHUS51 KPHI 010151
SMWPHI
ANZ450-451-470-471-010345-
/O.NEW.KPHI.MA.W.0059.210701T0151Z-210701T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
951 PM EDT Wed Jun 30 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1145 PM EDT.

* At 951 PM EDT, a gust front was located along a line extending 
  from Sandy Hook to 24 nm west of Pine Beach, moving east at 25 
  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...
  Sea Girt Reef, 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, Ocean Gate, Leonardo, Little Egg Reef, Barnegat Light Reef,
  Monmouth Beach, Sea Bright, Forked River and Fair Haven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4044 7398 4026 7365 3986 7333 3960 7332
      3925 7352 3949 7434 3962 7452 3960 7439
      3970 7426 3982 7427 3990 7420 3996 7425
      4000 7420 4020 7411 4024 7405 4035 7414
      4042 7406 4040 7398
TIME...MOT...LOC 0151Z 292DEG 27KT 4044 7400 3986 7470 

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

$$

Staarmann

1 follow-up statement

568 
FZUS71 KPHI 010251
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
1051 PM EDT Wed Jun 30 2021

ANZ450-451-470-471-010301-
/O.CAN.KPHI.MA.W.0059.000000T0000Z-210701T0345Z/
1051 PM EDT Wed Jun 30 2021

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

The affected areas were... 

Coastal and outer waters from Sandy Hook to Little Egg Inlet NJ...

The gust front has weakened and no longer poses a significant threat 
to boaters.

LAT...LON 4044 7398 4026 7365 3986 7333 3960 7332
      3925 7352 3949 7434 3962 7452 3960 7439
      3970 7426 3982 7427 3990 7420 3996 7425
      4000 7420 4020 7411 4024 7405 4035 7414
      4042 7406 4040 7398
TIME...MOT...LOC 0247Z 292DEG 27KT 4028 7349 3970 7419 

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	38 min
Jun 30, 8:56 PM EDT	Special Marine Warning	PHI		94 min
Jun 30, 9:05 PM EDT	Special Weather Statement	PHI	Somerset	40 min
Jun 30, 9:21 PM EDT	Special Weather Statement	PHI	Salem	39 min
Jun 30, 9:49 PM EDT	Special Weather Statement	PHI	Monmouth	26 min
Jul 1, 2:58 AM EDT	Small Craft Advisory	PHI		17 hr
Jul 1, 1:10 PM EDT	Special Weather Statement	PHI	Monmouth	50 min
Jul 1, 1:16 PM EDT	Special Weather Statement	PHI	Atlantic	29 min
Jul 1, 1:28 PM EDT	Special Marine Warning	PHI		62 min
Jul 1, 1:31 PM EDT	Special Weather Statement	PHI	Cumberland	29 min
Jul 1, 4:21 PM EDT	Special Marine Warning	PHI		114 min
Jul 1, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Salem and 1 more	48 min
Jul 1, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland, Salem	80 min
Jul 1, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more	46 min
Jul 1, 5:02 PM EDT	Tornado Warning	PHI	Burlington, Mercer	28 min
Jul 1, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 5 more	93 min
Jul 1, 5:35 PM EDT	Tornado Warning	PHI	Mercer, Monmouth, Ocean	25 min
Jul 1, 5:40 PM EDT	Special Marine Warning	PHI		65 min
Jul 1, 5:46 PM EDT	Special Marine Warning	PHI		119 min
Jul 1, 6:13 PM EDT	Special Marine Warning	PHI		92 min
Jun 30, 8:16 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	44 min
Jul 1, 2:51 PM EDT	Special Weather Statement	PHI	Chester, Montgomery	39 min
Jul 1, 3:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	47 min
Jul 1, 3:23 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	77 min
Jul 1, 3:48 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	112 min
Jul 1, 3:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	40 min
Jul 1, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	52 min
Jul 1, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Kent	52 min
Jul 1, 4:10 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	94 min
Jul 1, 4:32 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	43 min
Jul 1, 4:57 PM EDT	Tornado Warning	PHI	Kent, Sussex	22 min
Jul 1, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.