Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 31, NWS Philadelphia/Mount Holly

June 17, 20134 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 17, 2013, 4:06 PM EDT for 4 states. It was in force for 69 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: Jun 17, 2013, 4:06 PM EDT (20:06 UTC)
Expired: Jun 17, 2013, 5:15 PM EDT
In force: 69 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Salem County, NJ, Chester County, PA

The radar

The Dover AFB radar (KDOX), 97 km from the middle of the area, began a volume at 20:08 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
Jun 17, 4:40 PM EDT	TSTM WND DMG	London Grove Twp, PA	TREE DOWNED.
Jun 17, 4:41 PM EDT	TSTM WND DMG	Sadsbury Meeting House, PA	TREES DOWN ON UPPER VALLEY ROAD
Jun 17, 5:17 PM EDT	HAIL 0.25	Talleyville, DE
Jun 17, 5:25 PM EDT	TSTM WND DMG	Bellefonte, DE	TREES... BRANCHES... AND SIGNS DOWN.

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.1 hours before the alert went out and 49 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: 114 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 1078 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 87 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.

344 
WUUS51 KPHI 172006
SVRPHI
DEC003-MDC015-NJC033-PAC029-172115-
/O.NEW.KPHI.SV.W.0031.130617T2006Z-130617T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
406 PM EDT MON JUN 17 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  NORTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  SOUTHERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 515 PM EDT

* AT 404 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR PARADISE...MOVING SOUTHEAST
  AT 45 MPH. THIS STORM IS CAPABLE OF PRODUCING GOLF BALL SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HOMEVILLE AND PARKESBURG AROUND 415 PM EDT...
  COCHRANVILLE AND OXFORD AROUND 420 PM EDT...
  WEST GROVE AND LOMBARD AROUND 425 PM EDT...
  KEMBLESVILLE AND FAIR HILL AROUND 430 PM EDT...
  NORTH STAR AND LADENBERG AROUND 435 PM EDT...
  PIKE CREEK AND ASHLAND AROUND 440 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS SEVERE THUNDERSTORM...WHICH
COULD FLOOD LOW LYING AREAS QUICKLY AND COVER ROADS WITH WATER. DO
NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3988 7599 3997 7600 4005 7594 3987 7559
      3984 7560 3984 7553 3977 7540 3970 7533
      3964 7516 3946 7537 3946 7541 3941 7542
      3948 7555 3956 7552 3959 7555 3951 7555
      3950 7556 3950 7557 3978 7606
TIME...MOT...LOC 2005Z 306DEG 39KT 3997 7608

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 16, 8:15 PM EDT	Special Marine Warning	PHI		60 min
Jun 16, 8:51 PM EDT	Special Marine Warning	PHI		84 min
Jun 16, 10:38 PM EDT	Special Marine Warning	PHI		82 min
Jun 17, 2:37 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	53 min
Jun 17, 2:45 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Somerset	60 min
Jun 17, 3:25 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	65 min
Jun 17, 5:02 PM EDT	Special Weather Statement	PHI	Mercer	73 min
Jun 17, 5:14 PM EDT	Special Weather Statement	PHI	Gloucester	61 min
Jun 17, 5:48 PM EDT	Special Weather Statement	PHI	Monmouth	57 min
Jun 17, 5:55 PM EDT	Special Weather Statement	PHI	Salem	65 min
Jun 17, 6:05 PM EDT	Special Weather Statement	PHI	Atlantic, Salem	55 min
Jun 17, 6:29 PM EDT	Areal Flood Advisory	PHI	Salem	2 hr
Jun 17, 6:38 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Salem	67 min
Jun 17, 6:58 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	92 min
Jun 16, 10:02 PM EDT	Special Weather Statement	PHI	Sussex	58 min
Jun 16, 10:48 PM EDT	Special Weather Statement	PHI	Sussex	12 min
Jun 17, 7:29 PM EDT	River Flood Warning	PHI	New Castle	5 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2013 Severe Thunderstorm Warnings in Pennsylvania, 2013 Severe Thunderstorm Warnings in Maryland, 2013 Every severe thunderstorm warning in 2013

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.