Alert archive / New Jersey / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 24, 20124 states

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 24, 2012, 2:30 PM EDT for 4 states. It was in force for 90 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 24, 2012, 2:30 PM EDT (18:30 UTC)
Expired: Jul 24, 2012, 4:00 PM EDT
In force: 90 min
Issued by: NWS Philadelphia/Mount Holly

Counties New Castle County, DE, Cecil County, MD, Gloucester County, NJ, Salem County, NJ, Chester County, PA

The radar

The Dover AFB radar (KDOX), 77 km from the middle of the area, began a volume at 18:31 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.5 hours before the alert went out and 44 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: 1097 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 1128 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

053 
WWUS81 KPHI 241830
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
230 PM EDT TUE JUL 24 2012

DEZ001-002-MDZ008-NJZ016-017-021-PAZ067-070-242000-
CECIL MD-CHESTER PA-CUMBERLAND NJ-DELAWARE PA-GLOUCESTER NJ-KENT DE-
NEW CASTLE DE-SALEM NJ-
230 PM EDT TUE JUL 24 2012

...STRONG THUNDERSTORMS WILL AFFECT CECIL...CHESTER... 
CUMBERLAND...DELAWARE...GLOUCESTER...KENT...NEW CASTLE AND SALEM 
COUNTIES...

AT 227 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 9 MILES NORTHWEST OF NEWARK...MOVING SOUTHEAST AT
25 MPH. THE THUNDERSTORM WILL BE NEAR PIKE CREEK...NORTH STAR AROUND
245 PM...NEW CASTLE...STANTON AROUND 300 PM...PENNSVILLE...DELAWARE
CITY AROUND 315 PM...QUINTON...SALEM AROUND 330 PM...SHILOH AND
ALLOWAY AROUND 345 PM.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. DO 
NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS 
WHEN A THUNDERSTORM APPROACHES.

LAT...LON 3974 7610 3990 7600 4011 7570 3960 7494
      3926 7523 3929 7526 3928 7529 3934 7534
      3935 7539 3943 7547 3946 7555 3950 7556
      3948 7558 3926 7539 3917 7540 3959 7611
      3972 7623

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 8:56 PM EDT	Special Weather Statement	PHI	Morris	94 min
Jul 24, 3:23 AM EDT	Small Craft Advisory	PHI		37 hr
Jul 24, 2:20 PM EDT	Special Marine Warning	PHI		85 min
Jul 24, 3:17 PM EDT	Special Weather Statement	PHI	Atlantic, Cumberland	88 min
Jul 24, 3:40 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	65 min
Jul 24, 3:43 PM EDT	Special Marine Warning	PHI		92 min
Jul 24, 5:16 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	59 min
Jul 24, 5:27 PM EDT	Special Weather Statement	PHI	Atlantic, Gloucester	93 min
Jul 24, 5:31 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	59 min
Jul 24, 6:01 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	45 min
Jul 24, 7:45 PM EDT	Special Weather Statement	PHI	Monmouth	30 min
Jul 24, 7:46 PM EDT	Special Marine Warning	PHI		59 min
Jul 24, 3:41 AM EDT	Special Weather Statement	PHI	Pike	94 min

Nearby

Special Weather Statements in New Jersey, 2012 Special Weather Statements in Pennsylvania, 2012 Special Weather Statements in Delaware, 2012 Every special weather statement 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.