Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 115, NWS Philadelphia/Mount Holly

July 23, 2012Morris County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2012, 2:44 PM EDT for Morris County, Warren County, New Jersey. It was in force for 76 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: Jul 23, 2012, 2:44 PM EDT (18:44 UTC)
Expired: Jul 23, 2012, 4:00 PM EDT
In force: 76 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Morris County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 110 km from the middle of the area, began a volume at 18:43 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 23, 3:57 PM EDT	HAIL 0.88	Chester, NJ

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 23, 1:24 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.7 hours before the alert went out and 154 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: 253 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 69 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.

490 
WUUS51 KPHI 231844
SVRPHI
NJC027-041-232000-
/O.NEW.KPHI.SV.W.0115.120723T1844Z-120723T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
244 PM EDT MON JUL 23 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MORRIS COUNTY IN NORTHERN NEW JERSEY...
  NORTHEASTERN WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 400 PM EDT

* AT 239 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
  ALLAMUCHY-PANTHER VALLEY...OR 8 MILES SOUTHWEST OF NEWTON...AND
  MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ALLAMUCHY AND ALLAMUCHY-PANTHER VALLEY AROUND 250 PM EDT...
  BUDD LAKE AROUND 305 PM EDT...
  NETCONG AROUND 310 PM EDT...
  MOUNT ARLINGTON AROUND 315 PM EDT...
  SUCCASUNNA AROUND 320 PM EDT...
  WHARTON AROUND 325 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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
MONDAY EVENING FOR NORTHERN NEW JERSEY AND NORTHEASTERN PENNSYLVANIA.

&&

LAT...LON 4075 7463 4100 7501 4103 7490 4091 7477
      4092 7473 4090 7470 4094 7464 4096 7464
      4101 7459 4090 7435
TIME...MOT...LOC 1843Z 295DEG 18KT 4097 7484

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 11:26 AM EDT	Special Weather Statement	PHI	Sussex	94 min
Jul 23, 12:19 PM EDT	Special Weather Statement	PHI	Sussex	56 min
Jul 23, 12:32 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	73 min
Jul 23, 1:00 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	60 min
Jul 23, 1:11 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr
Jul 23, 1:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	78 min
Jul 23, 2:24 PM EDT	Special Weather Statement	PHI	Warren	66 min
Jul 23, 2:47 PM EDT	Flash Flood Warning	PHI	Morris, Sussex, Warren	3 hr
Jul 23, 3:42 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	78 min
Jul 23, 4:56 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth, Somerset	94 min
Jul 23, 5:56 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Hunterdon, Mercer	64 min
Jul 23, 6:35 PM EDT	Special Weather Statement	PHI	Morris, Sussex	85 min
Jul 23, 6:51 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	69 min
Jul 23, 7:39 PM EDT	Flash Flood Warning	PHI	Sussex, Warren	2 hr
Jul 23, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	59 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 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.