Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 67, NWS Philadelphia/Mount Holly

July 6, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 6, 2021, 8:11 PM EDT. It was in force for 82 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: Jul 6, 2021, 8:11 PM EDT (00:11 UTC)
Expired: Jul 6, 2021, 9:33 PM EDT
In force: 82 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), 50 km from the middle of the area, began a volume at 00:11 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, 0.2 hours before the alert went out and 174 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: 1647 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

034 
WHUS51 KPHI 070011
SMWPHI
ANZ451-452-471-472-070215-
/O.NEW.KPHI.MA.W.0067.210707T0011Z-210707T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
811 PM EDT Tue Jul 6 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1015 PM EDT.

* At 810 PM EDT, a strong gust front was located along a line 
  extending from 16 nm southeast of Shark River Reef to near Seaside 
  Park to 7 nm west of Pine Beach, moving southeast at 30 knots.

  HAZARD...Wind gusts 34 knots or greater.

  SOURCE...Numerous wind gauges on land have measured wind gusts of 
           34 kt or greater within the last hour.

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

* Locations impacted include...
  Ocean Gate, Atlantic City, Little Egg Reef, Atlantic City Reef,
  Ship Bottom, Great Egg Inlet, Barnegat Light Reef, Garden State
  South Reef, Harvey Cedars, Forked River, Great Egg Reef, Beach
  Haven, Barnegat Light, North Beach Haven, Garden State North Reef,
  Little Egg Inlet, Seaside Park, Brigantine and Pine Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3956 7334 3936 7344 3900 7372 3933 7467
      3938 7465 3947 7450 3956 7459 3961 7458
      3960 7439 3970 7426 3982 7427 3990 7420
      3994 7424 3989 7335 3977 7330
TIME...MOT...LOC 0010Z 315DEG 29KT 3992 7347 3990 7398 3992 7433 

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

$$

Staarmann

1 follow-up statement

349 
FZUS71 KPHI 070133
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
933 PM EDT Tue Jul 6 2021

ANZ451-452-471-472-070143-
/O.CAN.KPHI.MA.W.0067.000000T0000Z-210707T0215Z/
933 PM EDT Tue Jul 6 2021

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

The affected areas were... 

Coastal and outer waters from Manasquan Inlet to Great Egg Inlet
NJ...

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

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
southern New Jersey...and the adjacent coastal waters.

LAT...LON 3956 7334 3936 7344 3900 7372 3933 7467
      3938 7465 3947 7450 3956 7459 3961 7458
      3960 7439 3970 7426 3982 7427 3990 7420
      3994 7424 3989 7335 3977 7330
TIME...MOT...LOC 0128Z 315DEG 29KT 3947 7289 3945 7340 3947 7375 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 8:03 PM EDT	Special Weather Statement	PHI	Burlington, Ocean	42 min
Jul 6, 8:24 PM EDT	Special Marine Warning	PHI		2 hr
Jul 6, 8:29 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	46 min
Jul 6, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Monmouth, Morris, Somerset	53 min
Jul 6, 8:50 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	40 min
Jul 6, 9:04 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	41 min
Jul 6, 9:10 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset and 1 more	2 hr
Jul 6, 9:29 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset	61 min
Jul 6, 9:37 PM EDT	Special Marine Warning	PHI		113 min
Jul 6, 9:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	57 min
Jul 6, 10:21 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	39 min
Jul 6, 10:50 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	2 hr
Jul 6, 10:54 PM EDT	Special Weather Statement	PHI	Burlington	51 min
Jul 6, 11:11 PM EDT	Special Weather Statement	PHI	Burlington	19 min
Jul 6, 11:30 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Ocean	45 min
Jul 6, 11:39 PM EDT	Special Marine Warning	PHI		66 min
Jul 6, 11:55 PM EDT	Special Weather Statement	PHI	Monmouth	50 min
Jul 7, 12:01 AM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	71 min
Jul 7, 12:10 AM EDT	Special Marine Warning	PHI		95 min
Jul 7, 11:19 AM EDT	Tropical Storm Watch	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	18 hr
Jul 7, 3:32 PM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	42 hr
Jul 6, 8:16 PM EDT	Special Weather Statement	PHI	Lehigh	29 min
Jul 6, 10:08 PM EDT	Special Weather Statement	PHI	Philadelphia	37 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.