Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 121, NWS Philadelphia/Mount Holly

July 24, 2012Cumberland County, Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 24, 2012, 5:31 PM EDT for Cumberland County, Salem County, New Jersey. It was in force for 59 min. 1 report 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 24, 2012, 5:31 PM EDT (21:31 UTC)
Expired: Jul 24, 2012, 6:30 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Cumberland County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 65 km from the middle of the area, began a volume at 21:33 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 24, 5:35 PM EDT	TSTM WND DMG	Salem, NJ	POWER LINES DOWN DUE TO WIND

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, 9.5 hours before the alert went out and 78 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: 1097 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 1128 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 264 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.

001 
WUUS51 KPHI 242131
SVRPHI
NJC011-033-242230-
/O.NEW.KPHI.SV.W.0121.120724T2131Z-120724T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
531 PM EDT TUE JUL 24 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF MILLVILLE...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 630 PM EDT

* AT 527 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  SALEM...OR 9 MILES SOUTH OF WILMINGTON...AND MOVING SOUTHEAST AT 30
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  QUINTON...ALLOWAY AND HANCOCKS BRIDGE AROUND 540 PM EDT...
  SHILOH AROUND 555 PM EDT...
  SEABROOK FARMS AROUND 600 PM EDT...
  BRIDGETON AROUND 605 PM EDT...
  FAIRTON AROUND 610 PM EDT...
  CEDARVILLE AROUND 615 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO
GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
TUESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 3925 7489 3918 7495 3919 7503 3921 7504
      3920 7510 3918 7513 3954 7554 3957 7552
      3960 7556 3964 7556 3970 7549 3937 7485
TIME...MOT...LOC 2131Z 308DEG 28KT 3958 7548

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 8:56 PM EDT	Special Weather Statement	PHI	Morris	94 min
Jul 24, 3:23 AM EDT	Small Craft Advisory	PHI		37 hr
Jul 24, 2:20 PM EDT	Special Marine Warning	PHI		85 min
Jul 24, 2:30 PM EDT	Special Weather Statement	PHI	Gloucester, Salem	90 min
Jul 24, 3:17 PM EDT	Special Weather Statement	PHI	Atlantic, Cumberland	88 min
Jul 24, 3:40 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	65 min
Jul 24, 3:43 PM EDT	Special Marine Warning	PHI		92 min
Jul 24, 5:16 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	59 min
Jul 24, 5:27 PM EDT	Special Weather Statement	PHI	Atlantic, Gloucester	93 min
Jul 24, 6:01 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	45 min
Jul 24, 7:45 PM EDT	Special Weather Statement	PHI	Monmouth	30 min
Jul 24, 7:46 PM EDT	Special Marine Warning	PHI		59 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.