Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 84, NWS Philadelphia/Mount Holly

July 12, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 12, 2021, 4:26 PM EDT. It was in force for 2 hr. 7 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 12, 2021, 4:26 PM EDT (20:26 UTC)
Expired: Jul 12, 2021, 6:30 PM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 34.0 mph

The radar

The Philadelphia radar (KDIX), 40 km from the middle of the area, began a volume at 20:30 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 12, 4:45 PM EDT	TSTM WND DMG	1 N Ocean Gate, NJ	SEVERAL REPORTS OF DOWNED WIRES AND POWER OUTAGES IN THE ISLAND HEIGHTS AREA. TIME ESTIMATED FROM RADAR.
Jul 12, 4:45 PM EDT	TSTM WND DMG	2 Nne Toms River, NJ	DOWNED POWER LINES NEAR OAK AVENUE. TIME ESTIMATED FROM RADAR.
Jul 12, 4:55 PM EDT	TSTM WND DMG	1 Ssw Leisure Village E, NJ	NUMEROUS REPORTS OF DOWNED WIRES BETWEEN LAKEWOOD AND TOMS RIVER.
Jul 12, 4:55 PM EDT	TSTM WND DMG	Brick, NJ	SEVERAL TREES DOWN IN BRICK TWP. TIME ESTIMATED FROM RADAR.
Jul 12, 4:56 PM EDT	TSTM WND DMG	Brick, NJ	NUMEROUS DOWNED WIRE REPORTS IN BRICK TWP. TIME ESTIMATED FROM RADAR.
Jul 12, 5:06 PM EDT	HAIL 1	3 N Ocean Gate, NJ
Jul 12, 5:35 PM EDT	MARINE TSTM WIND 44	1 Ese Lanoka Harbor, NJ

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, 8.4 hours before the alert went out and 128 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: 857 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 697 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: 114 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

430 
WHUS51 KPHI 122026
SMWPHI
ANZ450-451-470-471-122230-
/O.NEW.KPHI.MA.W.0084.210712T2026Z-210712T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
426 PM EDT Mon Jul 12 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 630 PM EDT.

* At 425 PM EDT, a strong thunderstorm was located over Lavallette,
  moving east at 5 knots.

  HAZARD...Wind gusts 34 knots or greater and small hail.

  SOURCE...Radar.

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

* Locations impacted include...
  Ocean Gate, Sea Girt Reef, Shark River Reef, Point Pleasant Beach,
  Belmar, Seaside Park, Manasquan Inlet, Pine Beach, Axel Carlson
  Reef, Silverton and Lavallette.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4024 7363 4022 7362 3975 7368 3988 7422
      3990 7420 3993 7425 3996 7425 4000 7420
      4020 7411 4022 7410 4026 7365
TIME...MOT...LOC 2025Z 268DEG 7KT 3999 7403 

HAIL...<.75IN
WIND...>34KTS

$$

Staarmann

4 follow-up statements

655 
FZUS71 KPHI 122035
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
435 PM EDT Mon Jul 12 2021

ANZ450-451-470-471-122230-
/O.CON.KPHI.MA.W.0084.000000T0000Z-210712T2230Z/
435 PM EDT Mon Jul 12 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 630 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 435 PM EDT, a severe thunderstorm capable of producing waterspouts
was located near Lavallette, moving east at 5 knots.

HAZARD...Waterspouts, wind gusts to 40 knots, and small hail.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

Locations impacted include...
Ocean Gate, Sea Girt Reef, Shark River Reef, Point Pleasant Beach,
Belmar, Seaside Park, Manasquan Inlet, Pine Beach, Axel Carlson Reef,
Silverton and Lavallette.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4024 7363 4022 7362 3975 7368 3988 7422
      3990 7420 3993 7425 3996 7425 4000 7420
      4020 7411 4022 7410 4026 7365
TIME...MOT...LOC 2035Z 268DEG 7KT 3999 7400 

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

$$

Staarmann

288 
FZUS71 KPHI 122100
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
500 PM EDT Mon Jul 12 2021

ANZ450-451-470-471-122230-
/O.CON.KPHI.MA.W.0084.000000T0000Z-210712T2230Z/
500 PM EDT Mon Jul 12 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 630 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 500 PM EDT, severe thunderstorms capable of producing waterspouts
were located along a line extending from near Point Pleasant Beach to
Lavallette to Ocean Gate, moving east at 15 knots.

HAZARD...Waterspouts, wind gusts to nearly 50 knots, and small hail.

SOURCE...Law enforcement.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

Locations impacted include...
Ocean Gate, Sea Girt Reef, Shark River Reef, Point Pleasant Beach,
Belmar, Seaside Park, Manasquan Inlet, Pine Beach, Axel Carlson Reef,
Silverton and Lavallette.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Boaters should seek safe harbor immediately until these storms pass.
Wind gusts to nearly 50 knots, small hail, high waves, dangerous
lightning, and heavy rain are possible with these storms.

&&

LAT...LON 4024 7363 4022 7362 3975 7368 3988 7422
      3990 7420 3993 7425 3996 7425 4000 7420
      4020 7411 4022 7410 4026 7365
TIME...MOT...LOC 2100Z 284DEG 16KT 4004 7405 3997 7406 3990 7414 

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

$$

Staarmann

114 
FZUS71 KPHI 122207
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
607 PM EDT Mon Jul 12 2021

ANZ450-451-470-471-122230-
/O.CON.KPHI.MA.W.0084.000000T0000Z-210712T2230Z/
607 PM EDT Mon Jul 12 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 630 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 607 PM EDT, a severe thunderstorm capable of producing waterspouts
was located near Seaside Park, moving east at 10 knots.

HAZARD...Waterspouts, wind gusts 34 knots or greater, and small 
         hail.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

Locations impacted include...
Ocean Gate, Sea Girt Reef, Shark River Reef, Point Pleasant Beach,
Seaside Park, Manasquan Inlet, Pine Beach, Axel Carlson Reef,
Silverton and Lavallette.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 3975 7368 3988 7422 3990 7420 3993 7425
      3996 7425 4000 7420 4012 7412 4022 7362
TIME...MOT...LOC 2207Z 267DEG 10KT 3992 7400 

WATERSPOUT...POSSIBLE
HAIL...<.75IN
WIND...>34KTS

$$

Staarmann

181 
FZUS71 KPHI 122226
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
626 PM EDT Mon Jul 12 2021

ANZ450-451-470-471-122236-
/O.EXP.KPHI.MA.W.0084.000000T0000Z-210712T2230Z/
626 PM EDT Mon Jul 12 2021

...THE SPECIAL MARINE WARNING WILL EXPIRE AT 630 PM EDT...

The affected areas were... 

Coastal and outer waters from Sandy Hook to Little Egg Inlet NJ...

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

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and southern New Jersey...and the adjacent coastal waters.

LAT...LON 3975 7368 3988 7422 3990 7420 3993 7425
      3996 7425 4000 7420 4012 7412 4022 7362
TIME...MOT...LOC 2226Z 268DEG 7KT 3992 7396 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 1:59 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	3 hr
Jul 12, 2:12 PM EDT	Flash Flood Warning Emergency	PHI	Burlington	7 hr
Jul 12, 2:20 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth	3 hr
Jul 12, 2:37 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth	93 min
Jul 12, 3:08 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	67 min
Jul 12, 3:31 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	41 min
Jul 12, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	42 min
Jul 12, 4:52 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	98 min
Jul 12, 5:08 PM EDT	Areal Flood Advisory	PHI	Sussex	5 hr
Jul 12, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer	67 min
Jul 12, 5:26 PM EDT	Areal Flood Advisory	PHI	Camden	2 hr
Jul 12, 5:36 PM EDT	Special Weather Statement	PHI	Sussex	24 min
Jul 12, 5:41 PM EDT	Areal Flood Advisory	PHI	Burlington	83 min
Jul 12, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	63 min
Jul 12, 6:01 PM EDT	Flash Flood Warning	PHI	Camden	102 min
Jul 12, 6:08 PM EDT	Areal Flood Advisory	PHI	Morris	98 min
Jul 12, 6:43 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	93 min
Jul 12, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	34 min
Jul 12, 7:00 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	112 min
Jul 12, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Salem	69 min
Jul 12, 7:11 PM EDT	Flash Flood Warning	PHI	Morris, Sussex	35 min
Jul 12, 7:33 PM EDT	Special Marine Warning	PHI		58 min
Jul 11, 10:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks	24 min
Jul 11, 10:22 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	38 min
Jul 12, 2:28 PM EDT	Areal Flood Advisory	PHI	Chester	3 hr
Jul 12, 4:16 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	114 min
Jul 12, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	Chester	34 min
Jul 12, 6:18 PM EDT	Flash Flood Warning	PHI	Delaware	84 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.