Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 82, NWS Philadelphia/Mount Holly

June 1, 20115 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 1, 2011, 4:15 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 45 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
Jun 1, 2011, 4:15 PM EDT (20:15 UTC)
Expired
Jun 1, 2011, 5:00 PM EDT
In force
45 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 44 km from the middle of the area, began a volume at 20:16 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

TimeReportWhereRemark
Jun 1, 4:25 PM EDTHAIL 1Upper Makefield Twp, PA

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.

IssuedProductOfficeLasted
Jun 1, 12:58 PM EDTTornado WatchSPC7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.3 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-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2011-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2843 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2011-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 319 square meters per square second.1939587897117136156Sfc1 km3 km6 km9 kmRMLM
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
2843 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
1042 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
319 m²/s²
0-3 km storm-relative helicity
336 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

503 
WUUS51 KPHI 012015
SVRPHI
NJC019-021-023-025-035-PAC017-012100-
/O.NEW.KPHI.SV.W.0082.110601T2015Z-110601T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
415 PM EDT WED JUN 1 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  WEST CENTRAL MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  SOUTHERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  SOUTHWESTERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  EXTREME SOUTH CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 500 PM EDT

* AT 412 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
  RICHBORO...OR 13 MILES WEST OF TRENTON...AND MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  YARDLEY AND WOODSIDE AROUND 425 PM EDT...
  EWING AND PENNINGTON AROUND 430 PM EDT...
  LAWRENCEVILLE AND TRENTON AROUND 435 PM EDT...
  MERCERVILLE-HAMILTON SQUARE AROUND 440 PM EDT...
  EDINBURG AND PRINCETON AROUND 445 PM EDT...
  WINDSOR AROUND 450 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4027 7441 4025 7448 4023 7449 4021 7455
      4019 7456 4018 7508 4036 7510 4040 7474
      4040 7470 4041 7466 4041 7462 4041 7458
      4044 7433 4034 7432
TIME...MOT...LOC 2015Z 265DEG 30KT 4028 7496

$$

MPD
1 follow-up statement
600 
WWUS51 KPHI 012050
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
450 PM EDT WED JUN 1 2011

NJC019-PAC017-012059-
/O.CAN.KPHI.SV.W.0082.000000T0000Z-110601T2100Z/
HUNTERDON NJ-BUCKS PA-
450 PM EDT WED JUN 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BUCKS AND EXTREME
SOUTH CENTRAL HUNTERDON COUNTIES IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR NEW JERSEY AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH
ALSO REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING FOR
DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY.

LAT...LON 4027 7441 4025 7448 4023 7449 4025 7457
      4031 7473 4040 7474 4040 7470 4041 7466
      4041 7458 4044 7433 4034 7432
TIME...MOT...LOC 2049Z 255DEG 35KT 4037 7458

$$

NJC021-023-025-035-012100-
/O.CON.KPHI.SV.W.0082.000000T0000Z-110601T2100Z/
SOMERSET NJ-MERCER NJ-MIDDLESEX NJ-MONMOUTH NJ-
450 PM EDT WED JUN 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR CENTRAL MONMOUTH...SOUTHERN MIDDLESEX...NORTHEASTERN MERCER AND
EXTREME SOUTHWESTERN SOMERSET COUNTIES...

AT 441 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED NEAR 
PRINCETON...OR 10 MILES NORTHEAST OF TRENTON...MOVING EAST AT 35 
MPH. THE STORM IS CAPABLE OF PRODUCING QUARTER SIZED HAIL.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
HIGHTSTOWN...KENDALL PARK...MONMOUTH JUNCTION...SOUTH BRUNSWICK...
TWIN RIVERS...DAYTON...ROSSMOOR...CLEARBROOK PARK...CONCORDIA...
JAMESBURG...SPOTSWOOD...OLD BRIDGE...HELMETTA AND EAST BRUNSWICK

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR NEW JERSEY AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH
ALSO REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING FOR
DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY.

LAT...LON 4027 7441 4025 7448 4023 7449 4025 7457
      4031 7473 4040 7474 4040 7470 4041 7466
      4041 7458 4044 7433 4034 7432
TIME...MOT...LOC 2049Z 255DEG 35KT 4037 7458

$$

ROBERTSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 1:57 PM EDTSevere Thunderstorm WarningPHIWarren63 min
Jun 1, 3:08 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren16 min
Jun 1, 3:26 PM EDTSpecial Weather StatementPHISussex64 min
Jun 1, 4:00 PM EDTSmall Craft AdvisoryPHI35 hr
Jun 1, 4:05 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex, Warren40 min
Jun 1, 4:31 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean59 min
Jun 1, 4:59 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth61 min
Jun 1, 5:23 PM EDTSpecial Weather StatementPHISalem67 min
Jun 1, 5:50 PM EDTSpecial Marine WarningPHI40 min
Jun 1, 6:11 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean64 min
Jun 1, 6:42 PM EDTSpecial Marine WarningPHI63 min
Jun 1, 7:22 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean43 min
Jun 1, 12:56 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe60 min
Jun 1, 2:42 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Lehigh52 min
Jun 1, 4:55 PM EDTSevere Thunderstorm WarningPHIChester26 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011Severe Thunderstorm Warnings in Pennsylvania, 2011Every 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.