Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 66, NWS Philadelphia/Mount Holly

July 6, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 6, 2021, 6:33 PM EDT. It was in force for 117 min. 1 report 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 6, 2021, 6:33 PM EDT (22:33 UTC)
Expired: Jul 6, 2021, 8:30 PM EDT
In force: 117 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 49.0 mph

The radar

The Philadelphia radar (KDIX), 38 km from the middle of the area, began a volume at 22:33 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 6, 7:20 PM EDT	TSTM WND DMG	Red Bank, NJ	LARGE TREE DOWN, FENCE DESTROYED; 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, 10.6 hours before the alert went out and 129 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: 230 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

558 
WHUS51 KPHI 062233
SMWPHI
ANZ450-451-470-471-070030-
/O.NEW.KPHI.MA.W.0066.210706T2233Z-210707T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
633 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 Sandy Hook to Little Egg Inlet NJ...

* Until 830 PM EDT.

* At 631 PM EDT, strong thunderstorms were located along a line
  extending from near Upper New York Harbor to near Raritan Bay to 
  16 nm west of South Amboy, moving southeast at 45 knots. This line 
  of thunderstorms will be preceded by a strong squall of wind with 
  gusts of 40 to 50 kts possible.

  HAZARD...Wind gusts to nearly 50 knots and small hail.

  SOURCE...Airport observations.

  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, Barnegat
  Light Reef, Monmouth Beach, Sea Bright, Axel Carlson Reef,
  Silverton, Forked River, Fair Haven, Lavallette, Barnegat Light,
  Shark River Reef, Point Pleasant Beach, Belmar, Seaside Park,
  Manasquan Inlet, Pine Beach and Sandy Hook Reef.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4044 7398 4024 7363 3994 7337 3979 7330
      3973 7422 3979 7426 3982 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 2231Z 293DEG 45KT 4070 7399 4054 7420 4049 7463 

HAIL...<.75IN
WIND...49KTS

$$

Staarmann

1 follow-up statement

048 
FZUS71 KPHI 062313
MWSPHI

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

ANZ450-451-470-471-070030-
/O.CON.KPHI.MA.W.0066.000000T0000Z-210707T0030Z/
713 PM EDT Tue Jul 6 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 830 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 Manasquan Inlet NJ to Little Egg Inlet NJ out 20 to 40
nm...
Waters from Sandy Hook NJ to Manasquan Inlet NJ out 20 to 40 nm...

At 630 PM EDT, the NOS gauge at Robbins Reef reported a 48 kt wind 
gust. As of 710 PM EDT, strong thunderstorms were located along a 
line extending from Entrance to New York Harbor to 11 nm south of 
Cliffwood Beach, moving southeast at 40 knots.

HAZARD...Wind gusts to nearly 50 knots and small hail.

SOURCE...Buoy.

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, Barnegat
Light Reef, Monmouth Beach, Sea Bright, Axel Carlson Reef, Silverton,
Forked River, Fair Haven, Lavallette, Barnegat Light, Shark River
Reef, Point Pleasant Beach, Belmar, Seaside Park, Manasquan Inlet,
Pine Beach and Sandy Hook Reef.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4044 7398 4024 7363 3994 7337 3979 7330
      3973 7422 3979 7426 3982 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 2311Z 296DEG 40KT 4038 7372 4026 7429 

HAIL...<.75IN
WIND...49KTS

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:53 AM EDT	Small Craft Advisory	PHI		22 hr
Jul 6, 5:11 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	49 min
Jul 6, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	60 min
Jul 6, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	59 min
Jul 6, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset, Warren	65 min
Jul 6, 6:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	31 min
Jul 6, 6:17 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Monmouth, Somerset	58 min
Jul 6, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	64 min
Jul 6, 7:01 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	59 min
Jul 6, 7:59 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	61 min
Jul 6, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Jul 6, 4:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	76 min
Jul 6, 5:08 PM EDT	Special Weather Statement	PHI	Carbon	37 min
Jul 6, 5:34 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	41 min
Jul 6, 7:50 PM EDT	Special Weather Statement	PHI	Lehigh	25 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.