Alert archive / New Jersey / Special Marine Warnings in 2008

Special Marine Warning 21, NWS Philadelphia/Mount Holly

May 31, 2008

NWS Philadelphia/Mount Holly issued this special marine warning at May 31, 2008, 2:01 PM EDT. It was in force for 59 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: May 31, 2008, 2:01 PM EDT (18:01 UTC)
Expired: May 31, 2008, 3:00 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

The radar

The Dover AFB radar (KDOX), 41 km from the middle of the area, began a volume at 18:02 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.0 hours before the alert went out and 136 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: 395 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 690 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

000 
WHUS51 KPHI 311802
SMWPHI
ANZ430-431-311900-
/O.NEW.KPHI.MA.W.0021.080531T1801Z-080531T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
201 PM EDT SAT MAY 31 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SPECIAL MARINE WARNING FOR THE...
  DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE...
  DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE...

* UNTIL 300 PM EDT

* AT 157 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
  AREA OF THUNDERSTORMS...PRODUCING STRONG WINDS 34 KNOTS OR GREATER FROM
  10 NM NORTH OF FORTESQUE BEACH TO 47 NM SOUTHWEST OF SHIP JOHN
  SHOAL LIGHT...OR FROM 9 NM NORTHEAST OF SEA BREEZE TO 39 NM WEST OF
  BOWERS BEACH...MOVING SOUTHEAST AT 35 KNOTS.

* THESE STRONG THUNDERSTORMS WILL MOVE ACROSS DELAWARE BY THROUGH 300 PM.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 PM SATURDAY AFTERNOON FOR
DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND SOUTHEASTERN
PENNSYLVANIA.

LAT...LON 3935 7538 3935 7533 3930 7531 3930 7526
      3925 7517 3918 7514 3922 7504 3919 7502
      3918 7491 3913 7488 3897 7496 3897 7495
      3878 7512 3880 7519 3892 7531 3901 7533
      3907 7540 3916 7542 3921 7540 3931 7545
TIME...MOT...LOC 1801Z 326DEG 35KT 3936 7512 3880 7616

$$

RNS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 1:18 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden	42 min
May 31, 1:45 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cumberland, Ocean	9 min
May 31, 1:50 PM EDT	Special Marine Warning	PHI		85 min
May 31, 1:57 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Ocean	34 min
May 31, 2:50 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	55 min
May 31, 2:56 PM EDT	Special Marine Warning	PHI		94 min
May 31, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	61 min
May 31, 6:42 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	33 min
May 31, 1:36 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	54 min
May 31, 2:28 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	47 min
May 31, 3:11 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	64 min

Nearby

Special Marine Warnings in New Jersey, 2008 Every special marine warning in 2008

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.