Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 210, NWS Philadelphia/Mount Holly

July 29, 2011Burlington County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2011, 7:14 PM EDT for Burlington County, New Jersey. It was in force for 42 min. 7 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: Jul 29, 2011, 7:14 PM EDT (23:14 UTC)
Expired: Jul 29, 2011, 7:56 PM EDT
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Burlington County, NJ

The radar

The Philadelphia radar (KDIX), 44 km from the middle of the area, began a volume at 23:17 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 29, 7:20 PM EDT	TSTM WND DMG	Moorestown, NJ	TREES AND TREE LIMBS DOWN. SOME ROADS CLOSED DUE TO TREE DEBRIS... ESPECIALLY NEAR THE MOORESTOWN-DELRAN BORDER.
Jul 29, 7:20 PM EDT	HAIL 0.5	3 Ene Mount Laurel, NJ	HALF INCH HAIL NEAR MOUNT LAUREL. ALSO... 0.81 INCHES OF RAIN IN LESS THAN 30 MINUTES.
Jul 29, 7:26 PM EDT	TSTM WND GST 53	Mount Holly Airport, NJ	A THUNDERSTORM WIND GUST TO 53 MPH WAS MEASURED AT THE MOUNT HOLLY AIRPORT.
Jul 29, 7:32 PM EDT	TSTM WND DMG	Marlton, NJ
Jul 29, 7:32 PM EDT	TSTM WND DMG	Mount Laurel, NJ
Jul 29, 7:40 PM EDT	TSTM WND DMG	Southampton Twp, NJ	60 MPH WIND AND DOWNED TREES.
Jul 29, 7:55 PM EDT	TSTM WND DMG	Southampton Twp, NJ	60 MPH WIND AND DOWNED TREES

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
Jul 29, 2:40 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.2 hours before the alert went out and 204 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: 81 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 19 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.

757 
WUUS51 KPHI 292314
SVRPHI
NJC005-300000-
/O.NEW.KPHI.SV.W.0210.110729T2314Z-110730T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
714 PM EDT FRI JUL 29 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 800 PM EDT

* AT 712 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR MOUNT LAUREL...OR 7 MILES
  EAST OF CAMDEN...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MARLTON AROUND 720 PM EDT...
  MEDFORD AND LUMBERTON AROUND 730 PM EDT...
  LEISURETOWNE AROUND 740 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY EVENING
FOR NORTHWEST NEW JERSEY AND NORTHEAST PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3977 7481 3978 7483 3989 7496 3991 7496
      3994 7502 3997 7501 3998 7504 4001 7504
      4002 7501 3993 7462
TIME...MOT...LOC 2314Z 284DEG 27KT 3996 7495

$$

SZATKOWSKI

1 follow-up statement

439 
WWUS51 KPHI 292356
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
756 PM EDT FRI JUL 29 2011

NJC005-300004-
/O.CAN.KPHI.SV.W.0210.000000T0000Z-110730T0000Z/
BURLINGTON NJ-
756 PM EDT FRI JUL 29 2011

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BURLINGTON COUNTY
IS CANCELLED...

A SEVERE THUNDERSTORM WARNING CONTINUES FOR SOUTHEAST BURLINGTON 
COUNTY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY EVENING
FOR NORTHWEST NEW JERSEY AND NORTHEAST PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 3977 7481 3978 7483 3989 7496 3991 7496
      3994 7502 3997 7501 3998 7504 4001 7504
      4002 7501 3993 7462
TIME...MOT...LOC 2354Z 284DEG 27KT 3986 7458

$$

SZATKOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 2:42 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cumberland, Middlesex, Monmouth and 1 more	63 min
Jul 29, 3:45 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cumberland, Ocean	60 min
Jul 29, 5:12 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	108 min
Jul 29, 5:59 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	61 min
Jul 29, 6:17 PM EDT	Special Weather Statement	PHI	Monmouth	58 min
Jul 29, 6:23 PM EDT	Special Marine Warning	PHI		97 min
Jul 29, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	66 min
Jul 29, 6:25 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	20 min
Jul 29, 7:03 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	46 min
Jul 29, 7:27 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	63 min
Jul 29, 7:40 PM EDT	Special Marine Warning	PHI		95 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011 Every severe thunderstorm warning in 2011

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.