Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 28, 2012Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 28, 2012, 9:11 PM EDT for Bucks County, Philadelphia County, 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 28, 2012, 9:11 PM EDT (01:11 UTC)
Expired: Jul 28, 2012, 10:15 PM EDT
In force: 64 min
Issued by: NWS Philadelphia/Mount Holly

Counties Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 59 km from the middle of the area, began a volume at 01:12 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, 1.2 hours before the alert went out and 202 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: 69 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 20 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.

820 
WWUS81 KPHI 290111
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
911 PM EDT SAT JUL 28 2012

NJZ009-015-018-019-PAZ068>071-290215-
BUCKS PA-CAMDEN NJ-DELAWARE PA-HUNTERDON NJ-MERCER NJ-MONTGOMERY PA-
NORTHWESTERN BURLINGTON NJ-PHILADELPHIA PA-
911 PM EDT SAT JUL 28 2012

...STRONG THUNDERSTORMS WILL AFFECT BUCKS...BURLINGTON...CAMDEN...
DELAWARE...HUNTERDON...MERCER...MONTGOMERY AND PHILADELPHIA
COUNTIES...

AT 908 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 15 MILES SOUTHEAST
OF EASTON TO 18 MILES NORTH OF PHILADELPHIA TO 12 MILES WEST OF
PHILADELPHIA...MOVING EAST AT 20 MPH. THE THUNDERSTORMS WILL BE NEAR
FORT WASHINGTON AROUND 915 PM...FLOURTOWN...ROXBOROUGH AROUND 930
PM...KENSINGTON...CENTER CITY AROUND 945 PM...WISSINOMING...TACONY
AROUND 1000 PM...CROYDON AND MOORESTOWN-LENOLA AROUND 1015 PM.

WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.

LAT...LON 4021 7457 4018 7459 4018 7462 4017 7460
      3988 7477 3993 7550 3999 7543 3999 7545
      4003 7541 4004 7541 4006 7537 4006 7539
      4009 7541 4061 7507 4053 7492 4023 7495

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 8:02 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	2 hr
Jul 28, 8:05 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	55 min
Jul 28, 8:11 PM EDT	Special Marine Warning	PHI		64 min
Jul 28, 8:26 PM EDT	Areal Flood Advisory	PHI	Mercer	101 min
Jul 28, 8:38 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	67 min
Jul 28, 8:41 PM EDT	Special Weather Statement	PHI	Gloucester, Salem	64 min
Jul 28, 8:43 PM EDT	Special Marine Warning	PHI		62 min
Jul 28, 9:14 PM EDT	Special Marine Warning	PHI		61 min
Jul 28, 9:21 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	23 min
Jul 28, 9:24 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	66 min
Jul 28, 9:42 PM EDT	Special Marine Warning	PHI		63 min
Jul 28, 9:46 PM EDT	Special Weather Statement	PHI	Burlington, Ocean	59 min
Jul 28, 9:52 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	118 min
Jul 28, 9:52 PM EDT	Special Weather Statement	PHI	Camden	53 min
Jul 28, 10:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 28, 10:23 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	32 min
Jul 28, 10:31 PM EDT	Special Marine Warning	PHI		59 min
Jul 28, 10:39 PM EDT	Special Weather Statement	PHI	Ocean	66 min
Jul 29, 12:22 AM EDT	Special Marine Warning	PHI		23 min
Jul 29, 1:20 PM EDT	Special Weather Statement	PHI	Atlantic	55 min
Jul 29, 1:42 PM EDT	Areal Flood Advisory	PHI	Cape May	2 hr
Jul 29, 2:59 PM EDT	Special Weather Statement	PHI	Cape May	61 min
Jul 29, 3:35 PM EDT	Special Weather Statement	PHI	Atlantic	55 min
Jul 29, 4:41 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	64 min
Jul 29, 5:53 PM EDT	Special Weather Statement	PHI	Middlesex	52 min
Jul 28, 8:19 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	56 min
Jul 29, 3:03 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	57 min
Jul 29, 3:40 PM EDT	Areal Flood Advisory	PHI	Berks, Chester	74 min
Jul 29, 5:32 PM EDT	Special Weather Statement	PHI	Carbon, Lehigh, Northampton	58 min
Jul 29, 6:08 PM EDT	Areal Flood Advisory	PHI	Carbon	86 min
Jul 28, 8:09 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	66 min
Jul 28, 8:51 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Jul 28, 9:28 PM EDT	Special Weather Statement	PHI	Sussex	62 min
Jul 28, 10:15 PM EDT	Areal Flood Advisory	PHI	Sussex	69 min
Jul 29, 2:23 PM EDT	Special Weather Statement	PHI	Sussex	52 min
Jul 29, 3:45 PM EDT	Special Weather Statement	PHI	Sussex	60 min
Jul 28, 9:38 PM EDT	Special Weather Statement	PHI	Kent	67 min

Nearby

Special Weather Statements in Pennsylvania, 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.