Alert archive / New Jersey / Special Marine Warnings in 2012

Special Marine Warning 49, NWS Philadelphia/Mount Holly

June 30, 2012

NWS Philadelphia/Mount Holly issued this special marine warning at Jun 30, 2012, 2:18 AM EDT. It was in force for 117 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: Jun 30, 2012, 2:18 AM EDT (06:18 UTC)
Expired: Jun 30, 2012, 4:15 AM EDT
In force: 117 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

The radar

The Philadelphia radar (KDIX), 37 km from the middle of the area, began a volume at 06:19 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 00:00Z, 6.3 hours before the alert went out and 151 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: 2412 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1606 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 10.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

910 
WHUS51 KPHI 300618
SMWPHI
ANZ450-451-470-300815-
/O.NEW.KPHI.MA.W.0049.120630T0618Z-120630T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
218 AM EDT SAT JUN 30 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
  THE ATLANTIC COASTAL WATERS BETWEEN SANDY HOOK AND LITTLE EGG INLET
  NJ OUT TO 20 NM...
  THE ATLANTIC COASTAL WATERS BETWEEN SANDY HOOK NJ AND FENWICK
  ISLAND DE OUT 20 TO 40 NM...

  INCLUDING AXEL CARLSON REEF...BARNEGAT LIGHT...BARNEGAT LIGHT
  REEF...FORKED RIVER...GARDEN STATE NORTH REEF...GARDEN STATE SOUTH
  REEF...HARVEY CEDARS...LAVALLETTE...MANASQUAN INLET...NORTH BEACH
  HAVEN...OCEAN GATE...SEA GIRT REEF...SEASIDE PARK AND SHIP
  BOTTOM...

* UNTIL 415 AM EDT

* AT 215 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF THUNDERSTORMS...PRODUCING STRONG WINDS 34 KNOTS OR GREATER
  FROM 34 NM SOUTHEAST OF GARDEN STATE SOUTH REEF TO NORTH BEACH
  HAVEN...OR FROM 22 NM EAST OF DEEPWATER REEF TO NORTH BEACH
  HAVEN...MOVING EAST AT 30 KNOTS.

* THE GUST FRONT FROM THESE THUNDERSTORMS WILL AFFECT THE MONMOUTH
  COUNTY COASTAL WATERS.

* THESE STRONG THUNDERSTORMS WILL BE NEAR
  WATERS FROM SANDY HOOK NJ TO FENWICK ISLAND DE FROM 20 TO 40 NM AT
  230 AM EDT...
  COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20
  NM AT 230 AM EDT...
  COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM AT
  310 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MARINERS CAN EXPECT GUSTY WINDS...HIGH WAVES...DANGEROUS LIGHTNING...
AND HEAVY RAINS. BOATERS SHOULD SEEK SAFE HARBOR IMMEDIATELY...UNTIL
THIS STORM PASSES.

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF CAUGHT ON THE
OPEN WATER STAY BELOW DECK IF POSSIBLE...KEEP AWAY FROM UNGROUNDED
METAL OBJECTS.

&&

LAT...LON 3934 7345 3897 7376 3962 7428 3972 7418
      3972 7420 3982 7416 3982 7421 3984 7415
      3993 7411 3994 7419 3995 7412 4000 7416
      4004 7406 4005 7411 4005 7412 4007 7406
      4010 7409 4010 7408 4031 7395 3969 7330
TIME...MOT...LOC 0618Z 249DEG 29KT 3908 7371 3960 7419

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 11:53 PM EDT	Special Marine Warning	PHI		97 min
Jun 30, 12:04 AM EDT	Special Marine Warning	PHI		116 min
Jun 30, 12:18 AM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	72 min
Jun 30, 12:25 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	65 min
Jun 30, 12:27 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	63 min
Jun 30, 12:34 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Jun 30, 1:11 AM EDT	Special Marine Warning	PHI		64 min
Jun 30, 1:31 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	59 min
Jun 29, 10:54 PM EDT	Special Weather Statement	PHI	Chester, Delaware	51 min
Jun 29, 11:51 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	54 min
Jun 29, 11:22 PM EDT	Special Weather Statement	PHI	New Castle	53 min
Jun 29, 11:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	67 min
Jun 29, 11:50 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	55 min
Jun 30, 12:45 AM EDT	Special Weather Statement	PHI	Kent, New Castle, Sussex	60 min
Jun 30, 3:48 AM EDT	Heat Advisory	PHI	Kent, Sussex	16 hr

Nearby

Special Marine Warnings in New Jersey, 2012 Every special marine warning in 2012

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.