Alert archive / New Jersey / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 148, NWS Philadelphia/Mount Holly

July 23, 2008Gloucester County, Salem County, New Jersey; Delaware County, Philadelphia County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2008, 3:30 PM EDT for Gloucester County, Salem County, New Jersey; Delaware County, Philadelphia County, Pennsylvania; New Castle County, Delaware. It was in force for 60 min. 4 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: Jul 23, 2008, 3:30 PM EDT (19:30 UTC)
Expired: Jul 23, 2008, 4:30 PM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 96 km from the middle of the area, began a volume at 19:32 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
Jul 23, 3:55 PM EDT	TSTM WND DMG	1 N Wilmington Manor, DE	TREES BLOCKING ROAD NEAR RT. 202 AND FOULK RD. PEA SIZED HAIL ALSO REPORTED.
Jul 23, 4:04 PM EDT	TSTM WND DMG	Elsmere, DE	TREES AND WIRES DOWN
Jul 23, 4:22 PM EDT	HAIL 0.5	1 Ne Paulsboro, NJ
Jul 23, 4:35 PM EDT	TSTM WND DMG	1 N Wilmington Manor, DE	TREES BLOCKING ROAD NEAR RT. 202 AND FOULK RD. PEA SIZED HAIL ALSO REPORTED.

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
Jul 23, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.5 hours before the alert went out and 60 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: 1012 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 980 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -61 m²/s²
0-3 km storm-relative helicity: -48 m²/s²
Significant tornado parameter: -0.4
Supercell composite: -7.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 231930
SVRPHI
DEC003-NJC015-033-PAC045-101-232030-
/O.NEW.KPHI.SV.W.0148.080723T1930Z-080723T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
330 PM EDT WED JUL 23 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHWESTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 430 PM EDT

* AT 328 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR 
  PENNSVILLE...AND MOVING NORTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CARNEYS POINT AND WILMINGTON BY 340 PM...
  TALLEYVILLE AND BECKETT BY 355 PM...
  CHELSEA...CHESTER AND CONCORDVILLE BY 410 PM...
  NETHER PROVIDENCE TOWNSHIP...SWARTHMORE AND LIMA BY 420 PM...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM WEDNESDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
SOUTHEAST PENNSYLVANIA.

LAT...LON 3992 7555 3992 7553 3995 7551 3999 7545
      3992 7516 3958 7543 3962 7558 3967 7552
      3970 7552 3965 7556 3965 7559 3962 7560
      3963 7564
TIME...MOT...LOC 1930Z 201DEG 19KT 3966 7552

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 3:02 AM EDT	Special Marine Warning	PHI		58 min
Jul 23, 3:51 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	25 hr
Jul 23, 2:44 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	46 min
Jul 23, 2:55 PM EDT	Severe Thunderstorm Warning	PHI	Mercer	35 min
Jul 23, 2:58 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	47 min
Jul 23, 3:26 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	64 min
Jul 23, 4:03 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	57 min
Jul 23, 4:09 PM EDT	Tornado Warning	PHI	Middlesex, Somerset	36 min
Jul 23, 4:51 PM EDT	Areal Flood Warning	PHI	Middlesex, Somerset	105 min
Jul 23, 5:03 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	57 min
Jul 23, 5:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Somerset	62 min
Jul 23, 7:00 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	60 min
Jul 23, 7:10 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	35 min
Jul 23, 7:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	57 min
Jul 23, 4:23 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	3 hr
Jul 23, 3:58 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	62 min
Jul 23, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	38 min
Jul 23, 4:47 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	58 min
Jul 23, 1:11 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	64 min
Jul 23, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Kent	64 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2008 Severe Thunderstorm Warnings in Pennsylvania, 2008 Severe Thunderstorm Warnings in Delaware, 2008 Every severe thunderstorm warning in 2008

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.