Alert archive / New Jersey / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 151, NWS Philadelphia/Mount Holly

August 21, 2014Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 21, 2014, 6:31 PM EDT for Sussex County, New Jersey. It was in force for 59 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
Aug 21, 2014, 6:31 PM EDT (22:31 UTC)
Expired
Aug 21, 2014, 7:30 PM EDT
In force
59 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Sussex County, NJ

The radar

The Binghamton radar (KBGM), 149 km from the middle of the area, began a volume at 22:32 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
Aug 21, 7:40 PM EDTHAIL 0.25Montague, NJ

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.5 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, Brookhaven, NY at 12:00Z on 2014-08-21Temperature 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 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2014-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 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
1296 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
57 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.

634 
WUUS51 KPHI 212231
SVRPHI
NJC037-212330-
/O.NEW.KPHI.SV.W.0151.140821T2231Z-140821T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
631 PM EDT THU AUG 21 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL SUSSEX COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 730 PM EDT

* AT 622 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR MILFORD...MOVING SOUTHEAST
  AT 15 MPH. THIS STORM IS CAPABLE OF PRODUCING LARGE DAMAGING HAIL
  UP TO GOLF BALL SIZE. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MONTAGUE AROUND 640 PM EDT...
  HIGH POINT AROUND 700 PM EDT...
  SUSSEX AROUND 725 PM EDT...
  HAMBURG AROUND 730 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

&&

LAT...LON 4127 7449 4126 7449 4114 7458 4128 7484
      4129 7484 4131 7480 4132 7480 4135 7475
      4136 7469
TIME...MOT...LOC 2231Z 297DEG 14KT 4135 7481

$$

FORECASTER: AMC
1 follow-up statement
891 
WWUS51 KPHI 212310
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
710 PM EDT THU AUG 21 2014

NJC037-212330-
/O.CON.KPHI.SV.W.0151.000000T0000Z-140821T2330Z/
SUSSEX NJ-
710 PM EDT THU AUG 21 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTH CENTRAL SUSSEX COUNTY...

AT 708 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR HIGH POINT...OR NEAR PORT JERVIS...MOVING EAST AT 10 
MPH. ANOTHER THUNDERSTORM IS NEAR MONTAGUE AND MOVING EAST.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  HIGH POINT BY 715 PM EDT...
  8 MILES NORTH OF SUSSEX BY 730 PM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

LAT...LON 4127 7449 4126 7449 4114 7458 4128 7484
      4129 7484 4131 7480 4132 7480 4135 7475
      4136 7469
TIME...MOT...LOC 2309Z 283DEG 10KT 4135 7468

$$

AMC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 7:29 PM EDTSevere Thunderstorm WarningPHISussex49 min
Aug 21, 7:44 PM EDTAreal Flood AdvisoryPHISussex4 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2014Every severe thunderstorm warning in 2014

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.