Alert archive / New Jersey / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 11, NWS Philadelphia/Mount Holly

May 16, 2007Gloucester County, New Jersey; Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 16, 2007, 4:53 PM EDT for Gloucester County, New Jersey; Philadelphia County, Pennsylvania. It was in force for 52 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 16, 2007, 4:53 PM EDT (20:53 UTC)
Expired: May 16, 2007, 5:45 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Gloucester County, NJ, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 69 km from the middle of the area, began a volume at 20:53 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.

What was reported inside it

Time	Report	Where	Remark
May 16, 5:01 PM EDT	TSTM WND GST 51	Philadelphia, PA	51 MPH WIND GUST MEASURED IN THE ROXBOROUGH SECTION OF PHILADELPHIA. URBAN AND POOR DRAINAGE FLOODING ALSO REPORTED.
May 16, 5:05 PM EDT	TSTM WND DMG	Philadelphia, PA	TREES DOWN IN COBBS CREEK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 16, 1:26 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.9 hours before the alert went out and 89 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: 18 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1421 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 138 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.

000 
WUUS51 KPHI 162053
SVRPHI
NJC015-PAC101-162145-
/O.NEW.KPHI.SV.W.0011.070516T2053Z-070516T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
453 PM EDT WED MAY 16 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 545 PM EDT

* AT 449 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES NORTHWEST OF BECKETT...
  OR ABOUT 6 MILES NORTHEAST OF WILMINGTON...AND MOVING EAST AT 45
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GIBBSTOWN AND 9 MILES NORTH OF MULLICA HILL BY 505 PM EDT...
  SOUTH PHILADELPHIA...WOODBURY AND 8 MILES SOUTH OF ROXBOROUGH BY
  510 PM EDT...
  CENTER CITY AND 7 MILES SOUTH OF PHILADELPHIA BY 515 PM EDT...

LAT...LON 4000 7524 3986 7525 3982 7538 3976 7537
      3969 7532 3974 7504 3987 7513 3994 7514
      4011 7498

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 2:37 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	38 min
May 16, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset	55 min
May 16, 5:05 PM EDT	Severe Thunderstorm Warning	PHI	Camden	40 min
May 16, 5:20 PM EDT	Severe Thunderstorm Warning	PHI	Salem	40 min
May 16, 5:22 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	38 min
May 16, 5:49 PM EDT	Special Marine Warning	PHI		116 min
May 16, 6:55 PM EDT	Special Marine Warning	PHI		2 hr
May 16, 2:48 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	42 min
May 16, 3:26 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	49 min
May 16, 3:30 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery, Philadelphia	45 min
May 16, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Chester	44 min
May 16, 4:35 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	40 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2007 Severe Thunderstorm Warnings in Pennsylvania, 2007 Every severe thunderstorm warning in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.