Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 126, NWS Philadelphia/Mount Holly

August 30, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Aug 30, 2021, 5:26 PM EDT. It was in force for 64 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: Aug 30, 2021, 5:26 PM EDT (21:26 UTC)
Expired: Aug 30, 2021, 6:30 PM EDT
In force: 64 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), 49 km from the middle of the area, began a volume at 21:30 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
Aug 30, 5:47 PM EDT	MARINE TSTM WIND 40	4 Se Mystic Island, NJ	WXFLOW GAUGE.
Aug 30, 5:51 PM EDT	MARINE TSTM WIND 38	4 Se Mystic Island, NJ	CORRECTS PREVIOUS MARINE TSTM WIND REPORT FROM 4 SE MYSTIC ISLAND FOR CHANGE OF REPORT SOURCE. TUCKERTON WEATHERFLOW SITE GUSTS TO 38 MPH AT 551 PM.
Aug 30, 5:51 PM EDT	MARINE TSTM WIND 38	4 Se Mystic Island, NJ	TUCKERTON WEATHERFLOW SITE GUSTS TO 38 MPH AT 551 PM.

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, 9.4 hours before the alert went out and 195 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: 231 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

579 
WHUS51 KPHI 302126
SMWPHI
ANZ451-452-302230-
/O.NEW.KPHI.MA.W.0126.210830T2126Z-210830T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
526 PM EDT Mon Aug 30 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 630 PM EDT.

* At 526 PM EDT, a strong thunderstorm was located 7 nm northwest of
  Little Egg Inlet, moving east at 10 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...
  Beach Haven, North Beach Haven, Atlantic City, Little Egg Reef,
  Little Egg Inlet, Brigantine, Garden State South Reef and Atlantic
  City Reef.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

Frequent lightning is occurring with this storm. If caught on the
open water, stay below deck if possible and keep away from ungrounded
metal objects.

&&

LAT...LON 3960 7392 3920 7411 3941 7458 3947 7450
      3950 7453 3951 7453 3961 7445 3960 7439
      3964 7434
TIME...MOT...LOC 2126Z 286DEG 12KT 3955 7447 

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

$$

Gorse

1 follow-up statement

271 
FZUS71 KPHI 302209
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
609 PM EDT Mon Aug 30 2021

ANZ451-452-302230-
/O.CON.KPHI.MA.W.0126.000000T0000Z-210830T2230Z/
609 PM EDT Mon Aug 30 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 630 PM EDT...

For the following areas...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...

At 609 PM EDT, a strong thunderstorm was located over Brigantine, or
near Atlantic City, moving east at 10 knots.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Atlantic City, Little Egg Reef, Little Egg Inlet, Brigantine,
Atlantic City Reef and Beach Haven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

Frequent lightning is occurring with this storm. If caught on the
open water, stay below deck if possible and keep away from ungrounded
metal objects.

&&

LAT...LON 3920 7411 3941 7458 3947 7450 3956 7427
      3945 7399
TIME...MOT...LOC 2209Z 280DEG 9KT 3939 7436 

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

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 5:00 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	71 hr
Aug 30, 5:44 AM EDT	Dense Fog Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more	3 hr
Aug 30, 4:48 PM EDT	Special Weather Statement	PHI	Atlantic, Cumberland	27 min
Aug 30, 5:16 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	44 min
Aug 30, 5:21 PM EDT	Special Weather Statement	PHI	Atlantic	24 min
Aug 30, 5:44 PM EDT	Special Marine Warning	PHI		61 min
Aug 30, 5:53 PM EDT	Special Weather Statement	PHI	Atlantic	22 min
Aug 30, 5:56 PM EDT	Special Weather Statement	PHI	Cape May	49 min
Aug 30, 6:16 PM EDT	Special Marine Warning	PHI		89 min
Aug 30, 6:41 PM EDT	Special Weather Statement	PHI	Cape May	34 min
Aug 30, 7:20 PM EDT	Special Weather Statement	PHI	Cape May	25 min
Aug 30, 7:31 PM EDT	Special Marine Warning	PHI		59 min
Aug 30, 3:44 PM EDT	Special Weather Statement	PHI	New Castle	31 min
Aug 30, 4:14 PM EDT	Special Weather Statement	PHI	Kent	31 min
Aug 30, 6:02 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	28 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.