Alert archive / New Jersey / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2012Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2012, 2:53 PM EDT for Mercer County, New Jersey. It was in force for 67 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: Aug 4, 2012, 2:53 PM EDT (18:53 UTC)
Expired: Aug 4, 2012, 4:00 PM EDT
In force: 67 min
Issued by: NWS Philadelphia/Mount Holly

County Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 39 km from the middle of the area, began a volume at 18:53 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, 6.9 hours before the alert went out and 167 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: 2028 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 802 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

817 
WWUS81 KPHI 041853
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
253 PM EDT SAT AUG 4 2012

NJZ009-010-012-015-019-PAZ069-042000-
BUCKS PA-HUNTERDON NJ-MERCER NJ-MIDDLESEX NJ-
NORTHWESTERN BURLINGTON NJ-SOMERSET NJ-
253 PM EDT SAT AUG 4 2012

...A STRONG THUNDERSTORM WILL AFFECT BUCKS...BURLINGTON...
HUNTERDON...MERCER...MIDDLESEX AND SOMERSET COUNTIES...

AT 249 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
STRONG THUNDERSTORM NEAR LEVITTOWN...MOVING NORTH AT 20 MPH. THE 
THUNDERSTORM WILL BE NEAR MORRISVILLE AND TRENTON AROUND 300 
PM...EWING AND YARDLEY AROUND 315 PM...LAWRENCEVILLE AND PENNINGTON 
AROUND 330 PM...SKILLMAN AND HOPEWELL AROUND 345 PM...AND KENDALL 
PARK AND SOUTH BRUNSWICK AROUND 400 PM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.

EXPECT SMALL HAIL AND FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING
FROM THIS STORM.

LAT...LON 4040 7446 4018 7459 4018 7462 4016 7460
      4004 7467 4007 7494 4046 7494

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	34 min
Aug 4, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Salem	62 min
Aug 4, 2:28 PM EDT	Special Marine Warning	PHI		62 min
Aug 4, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	54 min
Aug 4, 3:35 PM EDT	Special Marine Warning	PHI		38 min
Aug 4, 3:42 PM EDT	Special Weather Statement	PHI	Middlesex, Somerset	63 min
Aug 4, 3:47 PM EDT	Small Craft Advisory	PHI		39 hr
Aug 4, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	59 min
Aug 4, 5:30 PM EDT	Small Craft Advisory	PHI		4 hr
Aug 4, 1:12 PM EDT	Special Weather Statement	PHI	Philadelphia	63 min
Aug 4, 1:46 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	44 min
Aug 4, 2:51 PM EDT	Special Weather Statement	PHI	Northampton	54 min
Aug 4, 3:55 PM EDT	Special Weather Statement	PHI	Lebanon	65 min
Aug 4, 4:08 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	52 min
Aug 4, 4:49 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	56 min
Aug 4, 1:18 PM EDT	Special Weather Statement	PHI	New Castle	57 min
Aug 4, 2:43 PM EDT	Areal Flood Advisory	PHI	New Castle	105 min
Aug 4, 3:31 PM EDT	Flash Flood Warning	PHI	New Castle	57 min
Aug 4, 3:31 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	28 min
Aug 4, 5:07 PM EDT	Special Weather Statement	PHI	Kent	53 min

Nearby

Special Weather Statements in New Jersey, 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.