Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 73, NWS Philadelphia/Mount Holly

July 8, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 8, 2021, 4:02 PM EDT. It was in force for 33 min. 3 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: Jul 8, 2021, 4:02 PM EDT (20:02 UTC)
Expired: Jul 8, 2021, 4:35 PM EDT
In force: 33 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 40.0 mph

The radar

The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 20:04 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
Jul 8, 4:08 PM EDT	TSTM WND DMG	2 Nw Wanamassa, NJ	A TREE WAS DOWNED ON NJ-18 NORTHBOUND RAMP TO EXIT 11. TIME ESTIMATED FROM RADAR.
Jul 8, 4:10 PM EDT	HAIL 0.5	2 Ssw Red Bank, NJ	MPING.
Jul 8, 4:13 PM EDT	TSTM WND DMG	Red Bank, NJ	TREE LIMBS AND WIRES WERE DOWNED IN RED BANK. TIME ESTIMATED FROM RADAR.

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, 8.0 hours before the alert went out and 114 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: 973 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 751 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

816 
WHUS51 KPHI 082002
SMWPHI
ANZ450-082100-
/O.NEW.KPHI.MA.W.0073.210708T2002Z-210708T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
402 PM EDT Thu Jul 8 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 500 PM EDT.

* At 402 PM EDT, a strong thunderstorm was located near Fair Haven,
  moving northeast at 25 knots.

  HAZARD...Wind gusts to 40 knots and small hail.

  SOURCE...Radar.

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

* Locations impacted include...
  Leonardo, Monmouth Beach, Sea Bright, Sandy Hook Reef, Atlantic
  Highlands and Fair Haven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4044 7398 4032 7376 4019 7411 4020 7412
      4024 7405 4027 7405 4032 7413 4035 7414
      4042 7406 4041 7399 4040 7398 4042 7398
      4042 7400
TIME...MOT...LOC 2002Z 223DEG 24KT 4031 7413 

HAIL...<.75IN
WIND...40KTS

$$

Staarmann

2 follow-up statements

369 
FZUS71 KPHI 082020
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
420 PM EDT Thu Jul 8 2021

ANZ450-082100-
/O.CON.KPHI.MA.W.0073.000000T0000Z-210708T2100Z/
420 PM EDT Thu Jul 8 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 500 PM EDT...

For the following areas...
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm...

At 420 PM EDT, a strong thunderstorm was located over Atlantic
Highlands, moving northeast at 25 knots.

HAZARD...Wind gusts to 40 knots and small hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Leonardo, Monmouth Beach, Sea Bright, Sandy Hook Reef, Atlantic
Highlands and Fair Haven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4037 7385 4028 7401 4037 7412 4042 7406
      4041 7399 4040 7398 4042 7399 4042 7400
      4044 7398
TIME...MOT...LOC 2020Z 224DEG 24KT 4038 7400 

HAIL...<.75IN
WIND...40KTS

$$

Staarmann

289 
FZUS71 KPHI 082035
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
435 PM EDT Thu Jul 8 2021

ANZ450-082045-
/O.CAN.KPHI.MA.W.0073.000000T0000Z-210708T2100Z/
435 PM EDT Thu Jul 8 2021

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

The affected areas were... 

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

The thunderstorm has moved out of the area and no longer poses a
significant threat to boaters.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central New Jersey...and the adjacent coastal waters.

LAT...LON 4037 7385 4028 7401 4037 7412 4042 7406
      4041 7399 4040 7398 4042 7399 4042 7400
      4044 7398
TIME...MOT...LOC 2034Z 223DEG 24KT 4045 7391 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 11:06 PM EDT	Tropical Storm Warning	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	32 hr
Jul 7, 11:37 PM EDT	Special Weather Statement	PHI	Sussex	38 min
Jul 8, 5:27 AM EDT	Small Craft Advisory	PHI		34 hr
Jul 8, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	41 min
Jul 8, 2:09 PM EDT	Special Marine Warning	PHI		81 min
Jul 8, 2:26 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	21 min
Jul 8, 2:29 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Warren	46 min
Jul 8, 2:43 PM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	27 hr
Jul 8, 3:03 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	42 min
Jul 8, 4:02 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	31 min
Jul 8, 4:43 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	16 min
Jul 8, 5:29 PM EDT	Special Weather Statement	PHI	Morris, Warren	46 min
Jul 8, 5:34 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	41 min
Jul 8, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	39 min
Jul 8, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex	51 min
Jul 8, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	44 min
Jul 7, 11:11 PM EDT	Special Weather Statement	PHI	Monroe	49 min
Jul 8, 8:53 AM EDT	Special Weather Statement	PHI	Monroe	52 min
Jul 8, 9:31 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	119 min
Jul 8, 9:46 AM EDT	Special Weather Statement	PHI	Monroe	44 min
Jul 8, 3:50 PM EDT	Special Weather Statement	PHI	Berks	25 min
Jul 8, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Montgomery	39 min
Jul 8, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	Berks	50 min
Jul 8, 4:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	45 min
Jul 8, 4:51 PM EDT	Severe Thunderstorm Warning	PHI	Berks	54 min
Jul 8, 5:11 PM EDT	Special Weather Statement	PHI	Lehigh	34 min
Jul 8, 5:21 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	39 min
Jul 8, 5:52 PM EDT	Special Weather Statement	PHI	Berks	23 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.