Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 71, NWS Philadelphia/Mount Holly

July 7, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 7, 2021, 12:10 AM EDT. It was in force for 95 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 7, 2021, 12:10 AM EDT (04:10 UTC)
Expired: Jul 7, 2021, 1:45 AM EDT
In force: 95 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), 40 km from the middle of the area, began a volume at 04:12 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, 4.2 hours before the alert went out and 178 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.

822 
WHUS51 KPHI 070410
SMWPHI
ANZ451-452-471-070545-
/O.NEW.KPHI.MA.W.0071.210707T0410Z-210707T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
1210 AM EDT Wed Jul 7 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  
Coastal waters from Manasquan Inlet to Great Egg Inlet NJ out 20
nm...
Outer waters from Manasquan Inlet to Little Egg Inlet NJ out 20 to 40
nm...

* Until 145 AM EDT.

* At 1210 AM EDT, strong thunderstorms were located along a line
  extending from 8 nm west of Pine Beach to 15 nm west of Forked
  River to 20 nm northwest of Little Egg Inlet, moving southeast 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...
  Beach Haven, Barnegat Light, North Beach Haven, Garden State North
  Reef, Little Egg Reef, Little Egg Inlet, Ship Bottom, Brigantine,
  Garden State South Reef, Harvey Cedars and Forked River.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

Frequent lightning is occurring with these storms. If caught on the
open water, stay below deck if possible and keep away from ungrounded
metal objects.

Report severe weather to the Coast Guard or the National Weather
Service.

&&

LAT...LON 3968 7360 3946 7384 3929 7420 3956 7460
      3960 7459 3962 7455 3960 7439 3970 7426
      3982 7427 3987 7422
TIME...MOT...LOC 0410Z 304DEG 27KT 3991 7435 3980 7447 3971 7467 

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

$$

MPS

1 follow-up statement

497 
FZUS71 KPHI 070432
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
1232 AM EDT Wed Jul 7 2021

ANZ451-452-471-070545-
/O.CON.KPHI.MA.W.0071.000000T0000Z-210707T0545Z/
1232 AM EDT Wed Jul 7 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 145 AM 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 Manasquan Inlet NJ to Little Egg Inlet NJ out 20 to 40
nm...

At 1232 AM EDT, strong thunderstorms were located along a line
extending from Ocean Gate to 7 nm northwest of Ship Bottom to 11 nm
northwest of Atlantic City, moving southeast at 30 knots.

HAZARD...Wind gusts 34 knots or greater.

SOURCE...Radar indicated.

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

Locations impacted include...
Beach Haven, Barnegat Light, North Beach Haven, Garden State North
Reef, Little Egg Reef, Little Egg Inlet, Ship Bottom, Garden State
South Reef, Harvey Cedars, Forked River and Brigantine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

Frequent lightning is occurring with these storms. If caught on the
open water, stay below deck if possible and keep away from ungrounded
metal objects.

Report severe weather to the Coast Guard or the National Weather
Service.

&&

LAT...LON 3946 7384 3929 7420 3956 7459 3960 7459
      3961 7457 3960 7439 3970 7426 3982 7427
      3987 7422 3968 7360
TIME...MOT...LOC 0432Z 313DEG 28KT 3994 7415 3973 7431 3952 7463 

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

$$

MPS

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, 8:11 PM EDT	Special Marine Warning	PHI		82 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, 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.