Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 171, NWS Philadelphia/Mount Holly

August 5, 2012Cumberland County, Salem County, New Jersey; Kent County, New Castle County, Delaware; Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 5, 2012, 6:21 PM EDT for Cumberland County, Salem County, New Jersey; Kent County, New Castle County, Delaware; Kent County, Queen Anne's County, Maryland. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 5, 2012, 6:21 PM EDT (22:21 UTC)
Expired: Aug 5, 2012, 7:00 PM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Kent County, MD, Queen Anne's County, MD, Cumberland County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 50 km from the middle of the area, began a volume at 22:23 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.

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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.4 hours before the alert went out and 149 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: 733 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 871 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 55 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.

558 
WUUS51 KPHI 052221
SVRPHI
DEC001-003-MDC029-035-NJC011-033-052330-
/O.NEW.KPHI.SV.W.0171.120805T2221Z-120805T2330Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN KENT COUNTY IN CENTRAL DELAWARE...
  THIS INCLUDES THE CITY OF DOVER...
  NORTHEASTERN KENT COUNTY IN NORTHEAST MARYLAND...
  NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  SOUTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  WESTERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  SOUTH CENTRAL SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 730 PM EDT

* AT 619 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 SASSAFRAS TO CRUMPTON TO CHURCH
  HILL...OR ALONG A LINE EXTENDING FROM MIDDLETOWN TO 17 MILES
  SOUTHWEST OF MIDDLETOWN TO 25 MILES NORTH OF EASTON...AND MOVING
  EAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MILLINGTON AROUND 630 PM EDT...
  DELANEY CORNER AROUND 635 PM EDT...
  SUDLERSVILLE AROUND 640 PM EDT...
  GREEN SPRING AROUND 650 PM EDT...
  SMYRNA...HARTLY AND CLAYTON AROUND 655 PM EDT...
  HAZLETTVILLE AROUND 705 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 3937 7587 3940 7576 3940 7552 3935 7548
      3932 7542 3935 7539 3943 7547 3950 7535
      3961 7525 3948 7513 3924 7519 3935 7539
      3931 7542 3920 7538 3910 7539 3910 7565
      3914 7576 3911 7583 3910 7602
TIME...MOT...LOC 2221Z 258DEG 25KT 3941 7579 3926 7590
          3913 7603

$$

HEAVENER

3 follow-up statements

398 
WWUS51 KPHI 052241
SVSPHI

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

MDC029-035-052252-
/O.CAN.KPHI.SV.W.0171.000000T0000Z-120805T2330Z/
KENT MD-QUEEN ANNE'S MD-
641 PM EDT SUN AUG 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN QUEEN ANNE'S AND
NORTHEASTERN KENT COUNTIES 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 3940 7576 3940 7552 3936 7549 3940 7544
      3943 7547 3951 7534 3961 7525 3948 7513
      3924 7519 3929 7526 3931 7533 3934 7534
      3934 7537 3939 7544 3935 7548 3932 7542
      3923 7539 3923 7576
TIME...MOT...LOC 2242Z 258DEG 25KT 3944 7560 3929 7572
          3916 7585

$$

DEC001-003-NJC011-033-052330-
/O.CON.KPHI.SV.W.0171.000000T0000Z-120805T2330Z/
NEW CASTLE DE-KENT DE-SALEM NJ-CUMBERLAND NJ-
641 PM EDT SUN AUG 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR WESTERN CUMBERLAND...SOUTH CENTRAL SALEM...NORTHERN KENT AND
SOUTHERN NEW CASTLE 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 TOWNSEND TO DELANEY CORNER
TO 12 MILES SOUTHWEST OF DELANEY CORNER...OR ALONG A LINE EXTENDING
FROM MIDDLETOWN TO 11 MILES SOUTH OF MIDDLETOWN TO 19 MILES WEST OF
DOVER...MOVING EAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  GREEN SPRING BY 650 PM EDT...
  CHAMBERSVILLE...SMYRNA AND CLAYTON BY 655 PM EDT...
  NEWPORT MEADOWS AND WOODLAND BEACH BY 710 PM EDT...
  LEIPSIC BY 715 PM EDT...
  GREENWICH AND SHILOH BY 720 PM EDT...
  SEABROOK FARMS BY 725 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 3940 7576 3940 7552 3936 7549 3940 7544
      3943 7547 3951 7534 3961 7525 3948 7513
      3924 7519 3929 7526 3931 7533 3934 7534
      3934 7537 3939 7544 3935 7548 3932 7542
      3923 7539 3923 7576
TIME...MOT...LOC 2242Z 258DEG 25KT 3944 7560 3929 7572
          3916 7585

$$

HEAVENER

915 
WWUS51 KPHI 052256
SVSPHI

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

NJC033-052306-
/O.CAN.KPHI.SV.W.0171.000000T0000Z-120805T2330Z/
SALEM NJ-
656 PM EDT SUN AUG 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SALEM 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 3923 7559 3933 7565 3938 7563 3940 7552
      3934 7546 3940 7540 3946 7541 3945 7537
      3947 7535 3935 7516 3929 7517 3924 7519
      3938 7542 3934 7546 3932 7542 3923 7539
TIME...MOT...LOC 2256Z 258DEG 25KT 3946 7548 3931 7560
          3918 7573

$$

DEC001-003-NJC011-052330-
/O.CON.KPHI.SV.W.0171.000000T0000Z-120805T2330Z/
NEW CASTLE DE-KENT DE-CUMBERLAND NJ-
656 PM EDT SUN AUG 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR WEST CENTRAL CUMBERLAND...NORTHEASTERN KENT AND SOUTHEASTERN NEW
CASTLE COUNTIES...

AT 652 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 WEST OF NEWPORT
MEADOWS TO GREEN SPRING TO 12 MILES SOUTHWEST OF GREEN SPRING...OR
ALONG A LINE EXTENDING FROM 11 MILES EAST OF MIDDLETOWN TO 11 MILES
SOUTHEAST OF MIDDLETOWN TO 13 MILES WEST OF DOVER...MOVING EAST AT 30
MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  NEWPORT MEADOWS AND WOODLAND BEACH BY 710 PM EDT...
  LEIPSIC BY 715 PM EDT...
  GREENWICH BY 720 PM EDT...
  FAIRTON AND CEDARVILLE BY 730 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 3923 7559 3933 7565 3938 7563 3940 7552
      3934 7546 3940 7540 3946 7541 3945 7537
      3947 7535 3935 7516 3929 7517 3924 7519
      3938 7542 3934 7546 3932 7542 3923 7539
TIME...MOT...LOC 2256Z 258DEG 25KT 3946 7548 3931 7560
          3918 7573

$$

HEAVENER

741 
WWUS51 KPHI 052300
SVSPHI

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

DEC001-003-NJC011-052310-
/O.CAN.KPHI.SV.W.0171.000000T0000Z-120805T2330Z/
NEW CASTLE DE-KENT DE-CUMBERLAND NJ-
700 PM EDT SUN AUG 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL CUMBERLAND...
NORTHEASTERN KENT AND SOUTHEASTERN NEW CASTLE COUNTIES IS
CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS GREATLY WEAKENED.

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 3923 7559 3933 7565 3938 7563 3940 7552
      3934 7546 3940 7540 3946 7541 3945 7537
      3947 7535 3935 7516 3929 7517 3924 7519
      3938 7542 3934 7546 3932 7542 3923 7539
TIME...MOT...LOC 2300Z 258DEG 25KT 3946 7544 3931 7556
          3919 7570

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	82 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
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, 7:52 PM EDT	Special Weather Statement	PHI	Queen Anne's	68 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012 Severe Thunderstorm Warnings in Delaware, 2012 Severe Thunderstorm Warnings in Maryland, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.