Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 23, 20124 counties in New Jersey; 6 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 23, 2012, 5:56 PM EDT for 4 counties in New Jersey; 6 counties in Pennsylvania. It was in force for 64 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 23, 2012, 5:56 PM EDT (21:56 UTC)
Expired: Jul 23, 2012, 7:00 PM EDT
In force: 64 min
Issued by: NWS Philadelphia/Mount Holly

Counties Burlington County, NJ, Camden County, NJ, Hunterdon County, NJ, Mercer County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 76 km from the middle of the area, began a volume at 21:58 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, 9.9 hours before the alert went out and 128 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: 1475 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

994 
WWUS81 KPHI 232156
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
556 PM EDT MON JUL 23 2012

NJZ009-010-015-017>019-027-PAZ060>062-067>071-232300-
BERKS PA-BUCKS PA-CAMDEN NJ-CHESTER PA-DELAWARE PA-GLOUCESTER NJ-
HUNTERDON NJ-LEHIGH PA-MERCER NJ-MONTGOMERY PA-NORTHAMPTON PA-
NORTHWESTERN BURLINGTON NJ-PHILADELPHIA PA-SOMERSET NJ-
SOUTHEASTERN BURLINGTON NJ-
556 PM EDT MON JUL 23 2012

...A STRONG THUNDERSTORM WILL AFFECT BERKS...BUCKS...BURLINGTON...
CAMDEN...CHESTER...DELAWARE...GLOUCESTER...HUNTERDON...LEHIGH...
MERCER...MONTGOMERY...NORTHAMPTON...PHILADELPHIA AND SOMERSET
COUNTIES...

AT 554 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 15 MILES EAST OF READING...MOVING EAST AT 20 MPH.
THE THUNDERSTORM WILL BE NEAR BECHTELSVILLE...BALLY AROUND 600 PM...
RED HILL...PENNSBURG AROUND 615 PM...GREEN LANE...TRUMBAUERSVILLE
AROUND 630 PM...SELLERSVILLE...PERKASIE AROUND 645 PM...DUBLIN AND
FRICKS AROUND 700 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.

THIS STORM WILL PRODUCE SMALL HAIL.

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 3971 7463 3990 7585 4065 7576 4067 7519
      4061 7520 4059 7518 4067 7506 4068 7469

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 11:26 AM EDT	Special Weather Statement	PHI	Sussex	94 min
Jul 23, 12:19 PM EDT	Special Weather Statement	PHI	Sussex	56 min
Jul 23, 12:32 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	73 min
Jul 23, 1:00 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	60 min
Jul 23, 1:11 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr
Jul 23, 1:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	78 min
Jul 23, 2:24 PM EDT	Special Weather Statement	PHI	Warren	66 min
Jul 23, 2:44 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Warren	76 min
Jul 23, 2:47 PM EDT	Flash Flood Warning	PHI	Morris, Sussex, Warren	3 hr
Jul 23, 3:42 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	78 min
Jul 23, 4:56 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth, Somerset	94 min
Jul 23, 6:35 PM EDT	Special Weather Statement	PHI	Morris, Sussex	85 min
Jul 23, 6:51 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	69 min
Jul 23, 7:39 PM EDT	Flash Flood Warning	PHI	Sussex, Warren	2 hr
Jul 23, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	59 min
Jul 23, 4:31 PM EDT	Special Weather Statement	PHI	Berks	59 min
Jul 23, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Lehigh, Montgomery	51 min

Nearby

Special Weather Statements in Pennsylvania, 2012 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.