Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 110, NWS Philadelphia/Mount Holly

August 10, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Aug 10, 2021, 7:09 PM EDT. It was in force for 66 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: Aug 10, 2021, 7:09 PM EDT (23:09 UTC)
Expired: Aug 10, 2021, 8:15 PM EDT
In force: 66 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), 42 km from the middle of the area, began a volume at 23:13 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 12:00Z, 11.2 hours before the alert went out and 124 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: 73 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 635 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

842 
WHUS51 KPHI 102309
SMWPHI
ANZ450-451-470-110015-
/O.NEW.KPHI.MA.W.0110.210810T2309Z-210811T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
709 PM EDT Tue Aug 10 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 815 PM EDT.

* At 708 PM EDT, strong thunderstorms were located along a line
  extending from Sandy Hook to 10 nm west of Point Pleasant Beach to 
  26 nm west of Pine Beach, moving east at 25 knots. A gust front is 
  preceding the line of thunderstorms and will have gusty winds 
  before the thunderstorms move through.

  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...
  Ocean Gate, Sea Girt Reef, Leonardo, Atlantic Highlands, Monmouth
  Beach, Sea Bright, Axel Carlson Reef, Silverton, Fair Haven,
  Lavallette, Shark River Reef, Point Pleasant Beach, Belmar, Seaside
  Park, Manasquan Inlet, Pine Beach, Sandy Hook Reef and Forked
  River.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4044 7398 4026 7365 4014 7354 4005 7360
      3981 7427 3990 7420 3993 7425 3996 7425
      4000 7420 4020 7411 4024 7405 4027 7405
      4032 7413 4035 7414 4042 7406 4040 7398
TIME...MOT...LOC 2308Z 280DEG 23KT 4049 7404 4015 7427 3997 7475 

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

$$

Robertson

2 follow-up statements

348 
FZUS71 KPHI 102339
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
739 PM EDT Tue Aug 10 2021

ANZ450-451-470-110015-
/O.CON.KPHI.MA.W.0110.000000T0000Z-210811T0015Z/
739 PM EDT Tue Aug 10 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 815 PM EDT...

For the following areas...
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 Sandy Hook NJ to Manasquan Inlet NJ out 20 to 40 nm...

At 738 PM EDT, a front was located along a line extending from 6 nm
northwest of Entrance to New York Harbor to Manasquan Inlet to 15 nm 
west of Pine Beach, moving east at 25 knots. A gust front is 
preceding the line of thunderstorms and will have gusty winds before 
the thunderstorms move through.

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...
Ocean Gate, Sea Girt Reef, Leonardo, Atlantic Highlands, Monmouth
Beach, Sea Bright, Axel Carlson Reef, Silverton, Fair Haven,
Lavallette, Shark River Reef, Point Pleasant Beach, Belmar, Seaside
Park, Manasquan Inlet, Pine Beach, Sandy Hook Reef and Forked River.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4044 7398 4026 7365 4014 7354 4005 7360
      3981 7427 3990 7420 3993 7425 3996 7425
      4000 7420 4020 7411 4024 7405 4027 7405
      4032 7413 4035 7414 4042 7406 4040 7398
TIME...MOT...LOC 2338Z 280DEG 23KT 4046 7380 4012 7403 3994 7451 

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

$$

Robertson

485 
FZUS71 KPHI 110011
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
811 PM EDT Tue Aug 10 2021

ANZ450-451-470-110020-
/O.EXP.KPHI.MA.W.0110.000000T0000Z-210811T0015Z/
811 PM EDT Tue Aug 10 2021

...THE SPECIAL MARINE WARNING WILL EXPIRE AT 815 PM EDT...

The affected areas were... 

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

The thunderstorms have weakened and no longer pose a significant 
threat to boaters. However, be alert for occasional lightning and 
gusty winds near 20 to 30 knots.

LAT...LON 4044 7398 4026 7365 4014 7354 4005 7360
      3981 7427 3990 7420 3993 7425 3996 7425
      4000 7420 4020 7411 4024 7405 4027 7405
      4032 7413 4035 7414 4042 7406 4040 7398
TIME...MOT...LOC 0010Z 280DEG 23KT 4043 7355 4009 7378 3991 7426 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 1:02 AM EDT	Special Weather Statement	PHI	Burlington	28 min
Aug 10, 3:33 AM EDT	Excessive Heat Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more	4 days
Aug 10, 3:33 AM EDT	Heat Advisory	PHI	Atlantic, Cape May, Cumberland, Monmouth, Ocean, Salem and 2 more	4 days
Aug 10, 3:54 AM EDT	Areal Flood Advisory	PHI	Atlantic	80 min
Aug 10, 4:59 AM EDT	Areal Flood Advisory	PHI	Burlington	60 min
Aug 10, 5:58 AM EDT	Flash Flood Warning	PHI	Burlington, Mercer	2 hr
Aug 10, 2:07 PM EDT	Special Weather Statement	PHI	Salem	38 min
Aug 10, 4:52 PM EDT	Special Weather Statement	PHI	Monmouth	23 min
Aug 10, 4:54 PM EDT	Special Marine Warning	PHI		26 min
Aug 10, 5:05 PM EDT	Special Weather Statement	PHI	Somerset, Warren	25 min
Aug 10, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Somerset, Warren	51 min
Aug 10, 5:30 PM EDT	Special Weather Statement	PHI	Warren	30 min
Aug 10, 5:58 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Morris, Somerset, Warren	32 min
Aug 10, 6:27 PM EDT	Special Weather Statement	PHI	Burlington, Mercer, Middlesex, Monmouth, Morris	33 min
Aug 10, 6:59 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	31 min
Aug 10, 7:27 PM EDT	Special Weather Statement	PHI	Monmouth	33 min
Aug 9, 10:10 PM EDT	Areal Flood Advisory	PHI	Carbon	3 hr
Aug 10, 3:06 PM EDT	Special Weather Statement	PHI	Berks	24 min
Aug 10, 3:33 PM EDT	Special Weather Statement	PHI	Berks	27 min
Aug 10, 3:52 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh	23 min
Aug 10, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Chester, Lehigh, Montgomery, Northampton	44 min
Aug 10, 4:18 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh	3 hr
Aug 10, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	42 min
Aug 10, 5:11 PM EDT	Special Weather Statement	PHI	Chester, Montgomery, Philadelphia	34 min
Aug 10, 5:40 PM EDT	Special Weather Statement	PHI	Chester	35 min
Aug 10, 6:36 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	39 min
Aug 10, 7:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	65 min
Aug 10, 7:54 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Chester	51 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.