Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 169, NWS Philadelphia/Mount Holly

August 5, 2012Cecil County, Maryland; Gloucester County, Salem County, New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 5, 2012, 5:38 PM EDT for Cecil County, Maryland; Gloucester County, Salem County, New Jersey; New Castle County, Delaware. It was in force for 82 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: Aug 5, 2012, 5:38 PM EDT (21:38 UTC)
Expired: Aug 5, 2012, 7:00 PM EDT
In force: 82 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Gloucester County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 75 km from the middle of the area, began a volume at 21:39 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
Aug 5, 6:08 PM EDT	TSTM WND DMG	Elkton, MD	SCATTERED TREES DOWN AND WIRES BENT ACROSS THE NORTHEAST PORTION OF CECIL 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
Aug 5, 3:36 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.6 hours before the alert went out and 159 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: 809 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 57 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.

823 
WUUS51 KPHI 052138
SVRPHI
DEC003-MDC015-NJC015-033-052300-
/O.NEW.KPHI.SV.W.0169.120805T2138Z-120805T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
538 PM EDT SUN AUG 5 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CECIL COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF ELKTON...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITIES OF...WILMINGTON...NEWARK...MIDDLETOWN...
  WEST CENTRAL GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 700 PM EDT

* AT 535 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 7 MILES NORTH OF BLAKE TO BAY
  VIEW TO 16 MILES SOUTHWEST OF CHARLESTOWN...OR ALONG A LINE
  EXTENDING FROM 11 MILES NORTHWEST OF NEWARK TO 9 MILES WEST OF
  ELKTON TO 23 MILES NORTHEAST OF BALTIMORE...AND MOVING EAST AT 30
  MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  FAIR HILL...CHERRY HILL AND ANDORA AROUND 545 PM EDT...
  GLEN WESTOVER...BARKSDALE AND APPLETON AROUND 550 PM EDT...
  ELKTON AND NEWARK AROUND 555 PM EDT...
  HOLLYWOOD BEACH AND PIKE CREEK AROUND 600 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.

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 3972 7599 3975 7521 3960 7524 3949 7533
      3946 7541 3939 7542 3947 7555 3950 7556
      3948 7558 3936 7551 3935 7555 3931 7558
      3930 7576 3938 7577 3940 7580 3940 7604
      3943 7600 3945 7603 3952 7599 3954 7607
TIME...MOT...LOC 2138Z 270DEG 26KT 3981 7585 3961 7597
          3943 7620

$$

HEAVENER

3 follow-up statements

623 
WWUS51 KPHI 052226
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
626 PM EDT SUN AUG 5 2012

DEC003-MDC015-NJC015-033-052300-
/O.CON.KPHI.SV.W.0169.000000T0000Z-120805T2300Z/
GLOUCESTER NJ-NEW CASTLE DE-CECIL MD-SALEM NJ-
626 PM EDT SUN AUG 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SALEM...EASTERN CECIL...NEW CASTLE AND WEST CENTRAL GLOUCESTER
COUNTIES...

AT 623 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES NORTH OF PENNS GROVE
TO DELAWARE CITY TO WARWICK...OR ALONG A LINE EXTENDING FROM 8 MILES
NORTHEAST OF WILMINGTON TO 8 MILES SOUTH OF WILMINGTON TO
MIDDLETOWN...MOVING EAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  PORT PENN AND SALEM BY 635 PM EDT...
  GREEN SPRING BY 640 PM EDT...
  QUINTON...HOPE CREEK...HANCOCKS BRIDGE AND CHAMBERSVILLE BY 645 PM
  EDT...
  MULLICA HILL AND ALLOWAY BY 650 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS UP TO 65 MPH WERE REPORTED IN PORT DEPOSIT WITH THIS 
STORM. THIS IS A DANGEROUS STORM...SEEK SAFE SHELTER AND STAY 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 3953 7588 3972 7583 3975 7521 3960 7524
      3949 7533 3946 7541 3939 7542 3947 7555
      3950 7556 3948 7558 3936 7551 3935 7555
      3931 7558 3930 7575 3938 7577 3940 7580
      3940 7594
TIME...MOT...LOC 2226Z 270DEG 26KT 3981 7540 3961 7552
          3943 7575

$$

HEAVENER

772 
WWUS51 KPHI 052243
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
643 PM EDT SUN AUG 5 2012

MDC015-052253-
/O.CAN.KPHI.SV.W.0169.000000T0000Z-120805T2300Z/
CECIL MD-
643 PM EDT SUN AUG 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CECIL COUNTY IS
CANCELLED...

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 3954 7570 3973 7553 3975 7521 3960 7524
      3949 7533 3946 7541 3939 7542 3947 7555
      3950 7556 3946 7558 3936 7551 3935 7555
      3931 7558 3930 7575 3942 7577
TIME...MOT...LOC 2243Z 270DEG 26KT 3981 7524 3961 7536
          3943 7559

$$

DEC003-NJC015-033-052300-
/O.CON.KPHI.SV.W.0169.000000T0000Z-120805T2300Z/
GLOUCESTER NJ-NEW CASTLE DE-SALEM NJ-
643 PM EDT SUN AUG 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SALEM...SOUTHERN NEW CASTLE AND WEST CENTRAL GLOUCESTER
COUNTIES...

AT 640 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM MULLICA HILL TO ALLOWAY TO
ODESSA...OR ALONG A LINE EXTENDING FROM 12 MILES SOUTHWEST OF CAMDEN
TO 11 MILES SOUTHEAST OF WILMINGTON TO MIDDLETOWN...MOVING EAST AT 30
MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  MULLICA HILL AND ALLOWAY BY 650 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3954 7570 3973 7553 3975 7521 3960 7524
      3949 7533 3946 7541 3939 7542 3947 7555
      3950 7556 3946 7558 3936 7551 3935 7555
      3931 7558 3930 7575 3942 7577
TIME...MOT...LOC 2243Z 270DEG 26KT 3981 7524 3961 7536
          3943 7559

$$

HEAVENER

960 
WWUS51 KPHI 052252
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
652 PM EDT SUN AUG 5 2012

DEC003-NJC015-033-052302-
/O.EXP.KPHI.SV.W.0169.000000T0000Z-120805T2300Z/
GLOUCESTER NJ-NEW CASTLE DE-SALEM NJ-
652 PM EDT SUN AUG 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR SALEM...SOUTHERN NEW CASTLE
AND WEST CENTRAL GLOUCESTER COUNTIES WILL EXPIRE AT 700 PM EDT...

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 3954 7570 3973 7553 3975 7521 3960 7524
      3949 7533 3946 7541 3939 7542 3947 7555
      3950 7556 3946 7558 3936 7551 3935 7555
      3931 7558 3930 7575 3942 7577
TIME...MOT...LOC 2252Z 270DEG 26KT 3981 7515 3961 7528
          3943 7551

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 4:40 PM EDT	Special Weather Statement	PHI	Cecil	95 min
Aug 5, 4:54 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	51 min
Aug 5, 5:10 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	80 min
Aug 5, 6:21 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	39 min
Aug 5, 7:52 PM EDT	Special Weather Statement	PHI	Queen Anne's	68 min
Aug 5, 3:49 AM EDT	Flash Flood Watch	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	16 hr
Aug 5, 1:00 PM EDT	Special Weather Statement	PHI	Warren	30 min
Aug 5, 1:20 PM EDT	Special Weather Statement	PHI	Sussex	85 min
Aug 5, 5:13 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	77 min
Aug 5, 5:22 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Hunterdon, Salem, Warren	68 min
Aug 5, 5:52 PM EDT	Special Marine Warning	PHI		83 min
Aug 5, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 3 more	74 min
Aug 5, 7:09 PM EDT	Special Weather Statement	PHI	Atlantic, Cumberland	66 min
Aug 5, 7:30 PM EDT	Special Weather Statement	PHI	Atlantic, Cumberland, Monmouth, Ocean	60 min
Aug 5, 7:38 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Ocean	67 min
Aug 5, 7:40 PM EDT	Special Marine Warning	PHI		95 min

Nearby

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