Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 72, NWS Philadelphia/Mount Holly

July 8, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 8, 2021, 2:09 PM EDT. It was in force for 81 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 8, 2021, 2:09 PM EDT (18:09 UTC)
Expired: Jul 8, 2021, 3:30 PM EDT
In force: 81 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 34.0 mph

The radar

The Philadelphia radar (KDIX), 46 km from the middle of the area, began a volume at 18:11 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, 6.2 hours before the alert went out and 120 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.

157 
WHUS51 KPHI 081809
SMWPHI
ANZ450-470-082015-
/O.NEW.KPHI.MA.W.0072.210708T1809Z-210708T2015Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  
Coastal and outer waters from Sandy Hook to Manasquan Inlet NJ...

* Until 415 PM EDT.

* At 209 PM EDT, a severe thunderstorm capable of producing
  waterspouts was located near Belmar, moving northeast at 10 knots.

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

  SOURCE...Radar.

  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...
  Sea Girt Reef, Shark River Reef, Belmar, Atlantic Highlands,
  Manasquan Inlet, Monmouth Beach, Sea Bright, Sandy Hook Reef, Fair
  Haven and Point Pleasant Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4044 7398 4026 7365 4010 7351 4010 7404
      4011 7405 4010 7409 4012 7410 4010 7410
      4010 7414 4011 7415 4020 7411 4024 7405
      4027 7405 4033 7413 4042 7404 4040 7398
TIME...MOT...LOC 1809Z 238DEG 9KT 4018 7412 

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

$$

Staarmann

3 follow-up statements

971 
FZUS71 KPHI 081848
MWSPHI

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

ANZ450-470-082015-
/O.CON.KPHI.MA.W.0072.000000T0000Z-210708T2015Z/
248 PM EDT Thu Jul 8 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 415 PM EDT...

For the following areas...
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 248 PM EDT, a severe thunderstorm capable of producing waterspouts
was located near Monmouth Beach, moving northeast 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...
Monmouth Beach, Sea Bright, Sandy Hook Reef, Atlantic Highlands, Fair
Haven and Belmar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4026 7365 4020 7360 4018 7401 4027 7405
      4036 7407 4041 7401 4040 7398 4044 7398
TIME...MOT...LOC 1848Z 233DEG 10KT 4026 7400 

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

$$

Staarmann

077 
FZUS71 KPHI 081917
MWSPHI

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

ANZ470-081926-
/O.CAN.KPHI.MA.W.0072.000000T0000Z-210708T2015Z/
317 PM EDT Thu Jul 8 2021

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

The affected areas were...

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

The thunderstorm has moved out of the warned 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 7402 4030 7406 4036 7407
      4041 7401 4040 7398 4044 7398
TIME...MOT...LOC 1916Z 220DEG 8KT 4035 7402 

$$

ANZ450-082015-
/O.CON.KPHI.MA.W.0072.000000T0000Z-210708T2015Z/
317 PM EDT Thu Jul 8 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 415 PM EDT...

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

At 316 PM EDT, a severe thunderstorm capable of producing waterspouts
was located over Fair Haven, moving northeast 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...
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 7402 4030 7406 4036 7407
      4041 7401 4040 7398 4044 7398
TIME...MOT...LOC 1916Z 220DEG 8KT 4035 7402 

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

$$

Staarmann

859 
FZUS71 KPHI 081930
MWSPHI

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

ANZ450-081940-
/O.CAN.KPHI.MA.W.0072.000000T0000Z-210708T2015Z/
330 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 weakened 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 7402 4030 7406 4036 7407
      4041 7401 4040 7398 4044 7398
TIME...MOT...LOC 1927Z 238DEG 9KT 4037 7398 

$$

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, 2:26 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	Special Marine Warning	PHI		33 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.