Alert archive / New Jersey / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 15, NWS Philadelphia/Mount Holly

May 4, 20104 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 4, 2010, 4:04 PM EDT for 4 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 56 min. 5 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
May 4, 2010, 4:04 PM EDT (20:04 UTC)
Expired
May 4, 2010, 5:00 PM EDT
In force
56 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 20:07 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
May 4, 4:10 PM EDTTSTM WND DMG2 N Dayton, NJNUMEROUS BRANCHES AND A COUPLE OF TREES DOWN ON DAVIDSON ROAD.
May 4, 4:14 PM EDTTSTM WND GST 0Lawrenceville, NJTREES AND POWER LINES DOWN
May 4, 4:14 PM EDTTSTM WND GST 0Somerset, NJTREES AND POWER LINES DOWN THROUGHOUT FRANKLIN AND MONTGOMERY TOWNSHIPS AND FAR HILLS BOROUGH 408 TO 420 PM
May 4, 4:17 PM EDTTSTM WND GST 0Flemington, NJTRESS DOWN THROUGHOUT COUNTY 340 TO 430 PM
May 4, 4:17 PM EDTTSTM WND GST 0New Hope, PATRESS AND POWER LINES DOWN THROUGHOUT SOLEBURY, CHALFONT, AND NORTHAMPTON TOWNSHIPS 405 TO 430 PM

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.1 hours before the alert went out and 152 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 2010-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 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 2010-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -89 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2190 m above ground
0-6 km bulk shear
81 kt
0-1 km storm-relative helicity
-89 m²/s²
0-3 km storm-relative helicity
-31 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

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

357 
WUUS51 KPHI 042004
SVRPHI
NJC019-021-023-035-PAC017-042100-
/O.NEW.KPHI.SV.W.0015.100504T2004Z-100504T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
404 PM EDT TUE MAY 4 2010

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 MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF NEW BRUNSWICK...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...
  SOUTHERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 500 PM EDT

* AT 400 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A LINE OF SEVERE THUNDERSTORMS. THESE STORMS WERE LOCATED ALONG A  
LINE EXTENDING FROM MARTINSVILLE TO STOCKTON TO 8 MILES WEST OF   
FRICKS...OR ALONG A LINE EXTENDING FROM SOMERVILLE TO 17 MILES   
NORTHWEST OF TRENTON TO 22 MILES SOUTH OF ALLENTOWN...AND MOVING   
EAST SOUTHEAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MARTINSVILLE...FLAGTOWN AND SOMERVILLE AROUND 410 PM EDT...
  MIDDLESEX...MANVILLE...SKILLMAN AND BELLE MEAD AROUND 415 PM EDT...
  SOCIETY HILL...RICHBORO AND IVYLAND AROUND 425 PM EDT...

LAT...LON 4047 7440 4018 7472 4013 7501 4036 7538
      4048 7503 4072 7460
TIME...MOT...LOC 2003Z 323DEG 23KT 4063 7457 4039 7494
          4026 7538

$$

RPW
1 follow-up statement
939 
WWUS51 KPHI 042040
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
440 PM EDT TUE MAY 4 2010

NJC019-PAC017-042047-
/O.CAN.KPHI.SV.W.0015.000000T0000Z-100504T2100Z/
HUNTERDON NJ-BUCKS PA-
440 PM EDT TUE MAY 4 2010

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

LAT...LON 4047 7441 4029 7460 4018 7473 4041 7497
      4031 7487 4062 7453
TIME...MOT...LOC 2037Z 323DEG 23KT 4045 7440 4022 7477
          4009 7521

$$

NJC021-023-035-042100-
/O.CON.KPHI.SV.W.0015.000000T0000Z-100504T2100Z/
SOMERSET NJ-MERCER NJ-MIDDLESEX NJ-
440 PM EDT TUE MAY 4 2010

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

AT 436 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
SHOW A WEAKENING AREA OF SHOWERS AND THUNDERSTORMS. THESE STORMS 
WILL MOVE EAST ACROSS THE AREA AT ABOUT 35 MPH. GUSTY WINDS TO NEAR 
60 MPH ARE POSSIBLE WITH SOME OF THE STRONGER STORMS. 

LAT...LON 4047 7441 4029 7460 4018 7473 4041 7497
      4031 7487 4062 7453
TIME...MOT...LOC 2037Z 323DEG 23KT 4045 7440 4022 7477
          4009 7521

$$

RPW

Nearby

Severe Thunderstorm Warnings in New Jersey, 2010Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning in 2010

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.