Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 229, NWS Philadelphia/Mount Holly

September 18, 2012Salem County, New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 18, 2012, 5:23 PM EDT for Salem County, New Jersey; New Castle County, Delaware. 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: Sep 18, 2012, 5:23 PM EDT (21:23 UTC)
Expired: Sep 18, 2012, 6:15 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 80 km from the middle of the area, began a volume at 21:24 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
Sep 18, 5:30 PM EDT	TSTM WND DMG	Delaware City, DE	SCATTERED REPORTS OF UTILITY WIRES DOWN COUNTYWIDE.
Sep 18, 5:50 PM EDT	TSTM WND DMG	Woodstown, NJ	A FEW TREE BRANCHES DOWN ON POWER LINES THROUGHOUT COUNTY

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
Sep 18, 12:10 PM EDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.4 hours before the alert went out and 54 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: 330 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 519 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 265 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

825 
WUUS51 KPHI 182123
SVRPHI
DEC003-NJC033-182215-
/O.NEW.KPHI.SV.W.0229.120918T2123Z-120918T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
523 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF WILMINGTON...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 615 PM EDT

* AT 520 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM ARDEN TO DELANEY CORNER...AND MOVING NORTHEAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CARNEYS POINT AROUND 530 PM EDT...
  HOPE CREEK AND SALEM AROUND 535 PM EDT...
  HANCOCKS BRIDGE AROUND 540 PM EDT...
  QUINTON AND WOODSTOWN AROUND 545 PM EDT...
  ALLOWAY AROUND 550 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

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

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.

&&

LAT...LON 3984 7560 3983 7547 3979 7541 3972 7538
      3966 7524 3967 7520 3963 7515 3945 7537
      3945 7541 3938 7542 3946 7555 3950 7556
      3946 7558 3942 7553 3936 7551 3935 7556
      3931 7559 3930 7576 3950 7578
TIME...MOT...LOC 2123Z 240DEG 38KT 3983 7546 3932 7571

$$

IOVINO

1 follow-up statement

250 
WWUS51 KPHI 182213
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
613 PM EDT TUE SEP 18 2012

DEC003-NJC033-182223-
/O.EXP.KPHI.SV.W.0229.000000T0000Z-120918T2215Z/
NEW CASTLE DE-SALEM NJ-
613 PM EDT TUE SEP 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR SALEM AND NEW CASTLE COUNTIES
WILL EXPIRE AT 615 PM EDT...

THE SEVERE THUNDERSTORMS HAVE MOVED TO THE EAST OF THE AREA.

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.

LAT...LON 3984 7560 3983 7547 3979 7541 3972 7538
      3966 7524 3967 7520 3963 7515 3945 7537
      3945 7541 3938 7542 3946 7555 3950 7556
      3946 7558 3942 7553 3936 7551 3935 7556
      3931 7559 3930 7576 3950 7578
TIME...MOT...LOC 2213Z 240DEG 38KT 4009 7486 3958 7512

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 8:54 PM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	23 hr
Sep 18, 4:13 AM EDT	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	21 hr
Sep 18, 4:21 PM EDT	Severe Thunderstorm Warning	PHI	Salem	69 min
Sep 18, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Warren	52 min
Sep 18, 4:26 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	3 hr
Sep 18, 5:01 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	59 min
Sep 18, 5:12 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Warren	63 min
Sep 18, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	78 min
Sep 18, 5:13 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	62 min
Sep 18, 6:00 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 3 more	60 min
Sep 18, 6:02 PM EDT	Special Marine Warning	PHI		88 min
Sep 18, 6:06 PM EDT	Areal Flood Advisory	PHI	Burlington, Hunterdon, Mercer, Middlesex, Morris, Somerset and 2 more	54 min
Sep 18, 6:46 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	119 min
Sep 18, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Morris, Somerset	53 min
Sep 18, 6:54 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Morris, Ocean and 1 more	111 min
Sep 18, 7:04 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Cumberland	56 min
Sep 18, 7:16 PM EDT	Areal Flood Advisory	PHI	Cape May	59 min
Sep 18, 7:51 PM EDT	Special Weather Statement	PHI	Atlantic, Cape May, Ocean	54 min
Sep 18, 7:52 PM EDT	Special Marine Warning	PHI		77 min
Sep 18, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Ocean	64 min
Sep 18, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	78 min
Sep 18, 7:08 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	38 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012 Severe Thunderstorm Warnings in Delaware, 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.