Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 11, NWS Philadelphia/Mount Holly

May 24, 2012Hunterdon County, Mercer County, New Jersey; Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 24, 2012, 2:36 PM EDT for Hunterdon County, Mercer County, New Jersey; Bucks County, Montgomery County, Pennsylvania. It was in force for 54 min. 6 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 24, 2012, 2:36 PM EDT (18:36 UTC)
Expired: May 24, 2012, 3:30 PM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Mercer County, NJ, Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 18:37 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
May 24, 2:50 PM EDT	HAIL 1	Chalfont, PA
May 24, 2:57 PM EDT	TSTM WND DMG	Hilltown Twp, PA	TREES REPORTED DOWN IN HILLTOWN.
May 24, 3:03 PM EDT	TSTM WND DMG	West Rockhill Twp, PA	TREES REPORTED DOWN IN WEST ROCKHILL.
May 24, 3:03 PM EDT	HAIL 1	West Rockhill Twp, PA
May 24, 3:07 PM EDT	TSTM WND GST 60	Perkasie, PA
May 24, 3:12 PM EDT	HAIL 0.88	Quakertown, PA

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, 6.6 hours before the alert went out and 140 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: 302 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 6 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.

552 
WUUS51 KPHI 241836
SVRPHI
NJC019-021-PAC017-091-241930-
/O.NEW.KPHI.SV.W.0011.120524T1836Z-120524T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
236 PM EDT THU MAY 24 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  EAST CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 330 PM EDT

* AT 233 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 PENNINGTON TO IVYLAND...OR
  ALONG A LINE EXTENDING FROM 8 MILES NORTH OF TRENTON TO 14 MILES
  NORTH OF PHILADELPHIA...AND MOVING NORTH AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HOPEWELL...NEW HOPE...DOYLESTOWN...CHALFONT...FRICKS...STOCKTON...
  ROBESONIA...GARDENVILLE...LUMBERVILLE...SERGEANTSVILLE...SAND
  BROOK...DUBLIN...BYRAM...FLEMINGTON...PERKASIE...PIPERSVILLE...
  TINICUM TOWNSHIP...BEDMINSTER...SPRINGTOWN...REVERE...PLEASANT
  VALLEY...OTTSVILLE...ERWINNA...FERNDALE...HAMPTON...RIEGELSVILLE...
  QUAKERTOWN...MILFORD...HIGH BRIDGE...GLEN GARDNER...FRENCHTOWN...
  CLINTON...BLOOMSBURY AND ANNANDALE

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.

&&

LAT...LON 4018 7522 4047 7543 4053 7535 4059 7524
      4061 7520 4059 7518 4063 7514 4068 7505
      4073 7490 4026 7469
TIME...MOT...LOC 1836Z 158DEG 14KT 4035 7477 4022 7513

$$

TFG

1 follow-up statement

492 
WWUS51 KPHI 241904
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
304 PM EDT THU MAY 24 2012

NJC021-PAC091-241913-
/O.CAN.KPHI.SV.W.0011.000000T0000Z-120524T1930Z/
MERCER NJ-MONTGOMERY PA-
304 PM EDT THU MAY 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONTGOMERY AND
NORTHWESTERN MERCER COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM HAS MOVED NORTH OF THE COUNTY.

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 4026 7522 4027 7523 4032 7531 4047 7543
      4053 7535 4061 7521 4059 7518 4063 7514
      4068 7505 4073 7490 4042 7479
TIME...MOT...LOC 1903Z 127DEG 24KT 4046 7498 4033 7534

$$

NJC019-PAC017-241930-
/O.CON.KPHI.SV.W.0011.000000T0000Z-120524T1930Z/
HUNTERDON NJ-BUCKS PA-
304 PM EDT THU MAY 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHERN BUCKS AND HUNTERDON COUNTIES...

AT 259 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 SERGEANTSVILLE TO
SILVERDALE...OR ALONG A LINE EXTENDING FROM 18 MILES NORTHWEST OF
TRENTON TO 21 MILES SOUTHEAST OF ALLENTOWN...MOVING NORTHWEST AT 30
MPH.

TERMINAL DOPPLER RADAR INDICATED A LARGE SWATH OF 40 TO 60 MPH WINDS
FROM SELLERSVILLE EAST THROUGH OTTSVILLE AND FRENCHTOWN.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SELLERSVILLE...PIPERSVILLE...PERKASIE...TINICUM TOWNSHIP...
BEDMINSTER...ANNANDALE...CLINTON...HIGH BRIDGE...ERWINNA...
OTTSVILLE...FRENCHTOWN...TRUMBAUERSVILLE...QUAKERTOWN...GLEN
GARDNER...REVERE...MILFORD...HAMPTON...RICHLANDTOWN...FERNDALE...
SPRINGTOWN...PLEASANT VALLEY...RIEGELSVILLE AND BLOOMSBURY

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 4026 7522 4027 7523 4032 7531 4047 7543
      4053 7535 4061 7521 4059 7518 4063 7514
      4068 7505 4073 7490 4042 7479
TIME...MOT...LOC 1903Z 127DEG 24KT 4046 7498 4033 7534

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 24, 12:52 PM EDT	Special Weather Statement	PHI	Camden, Gloucester	53 min
May 24, 1:06 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester	94 min
May 24, 1:18 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	38 min
May 24, 1:19 PM EDT	Special Weather Statement	PHI	Burlington	56 min
May 24, 1:27 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	48 min
May 24, 1:36 PM EDT	Areal Flood Advisory	PHI	Burlington	84 min
May 24, 1:47 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth	43 min
May 24, 1:50 PM EDT	Flash Flood Warning	PHI	Burlington	89 min
May 24, 2:01 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer	83 min
May 24, 2:08 PM EDT	Severe Thunderstorm Warning	PHI	Mercer	52 min
May 24, 2:21 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	97 min
May 24, 2:32 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	29 min
May 24, 3:13 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	91 min
May 24, 3:38 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	67 min
May 24, 4:23 PM EDT	Special Weather Statement	PHI	Morris, Sussex, Warren	97 min
May 24, 1:57 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	63 min
May 24, 2:26 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery	64 min
May 24, 3:09 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	66 min
May 24, 3:16 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	59 min
May 24, 3:39 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	57 min
May 24, 4:00 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	67 min
May 24, 4:07 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	83 min

Nearby

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