Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 69, NWS Philadelphia/Mount Holly

July 1, 2012Morris County, Sussex County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2012, 4:31 PM EDT for Morris County, Sussex County, Warren County, New Jersey. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 1, 2012, 4:31 PM EDT (20:31 UTC)
Expired
Jul 1, 2012, 5:30 PM EDT
In force
59 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Morris County, NJ, Sussex County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 113 km from the middle of the area, began a volume at 20:34 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 1, 1:35 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.5 hours before the alert went out and 132 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 2012-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 254 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, Brookhaven, NY at 12:00Z on 2012-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.193958Sfc1 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
254 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
1757 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
40 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.

805 
WUUS51 KPHI 012031
SVRPHI
NJC027-037-041-012130-
/O.NEW.KPHI.SV.W.0069.120701T2031Z-120701T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
431 PM EDT SUN JUL 1 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF MORRISTOWN...
  SOUTHERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  THIS INCLUDES THE CITY OF NEWTON...
  EAST CENTRAL WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 530 PM EDT

* AT 426 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
  AREA OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS OF 60 MPH.  THESE STORMS WERE
  LOCATED FROM NEWTON TO HOPE...OR FROM NEWTON TO 15 MILES SOUTHWEST 
  OF NEWTON...AND MOVING EAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  FRANKLIN...GREAT MEADOWS AND GREAT MEADOWS-VIENNA AROUND 435 PM
  EDT...
  OGDENSBURG...LAKE MOHAWK...ANDOVER AND ALLAMUCHY AROUND 440 PM
  EDT...
  HACKETTSTOWN AROUND 445 PM EDT...
  HOPATCONG AROUND 450 PM EDT...
  GREEN POND AROUND 455 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...DANGEROUS 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.

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 800 PM EDT SUNDAY
EVENING FOR NORTHERN NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4089 7428 4090 7433 4082 7432 4075 7439
      4091 7508 4114 7464 4111 7448 4109 7450
      4104 7450 4105 7445 4102 7443 4100 7430
      4098 7428 4092 7429 4091 7427
TIME...MOT...LOC 2030Z 286DEG 22KT 4108 7466 4094 7492

$$

MPD
1 follow-up statement
621 
WWUS51 KPHI 012104
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
504 PM EDT SUN JUL 1 2012

NJC027-037-041-012130-
/O.CON.KPHI.SV.W.0069.000000T0000Z-120701T2130Z/
WARREN NJ-MORRIS NJ-SUSSEX NJ-
504 PM EDT SUN JUL 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTH CENTRAL SUSSEX...MORRIS AND EAST CENTRAL WARREN COUNTIES...

AT 456 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE AN AREA OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS OF 60 MPH.  THESE STORMS WERE LOCATED
FROM GREEN POND TO STANHOPE TO HOPE...OR FROM ABOUT 15 MILES NORTHWEST
OF PATERSON TO ABOUT 10 MILES SOUTH OF NEWTON TO ABOUT 15 MILES 
SOUTHWEST OF NEWTON...MOVING EAST AT 25 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  NETCONG AND LAKE TELEMARK BY 510 PM EDT...
  WHITE MEADOW LAKE...WHARTON...KINNELON AND BUTLER BY 515 PM EDT...
  ROCKAWAY...RIVERDALE...DOVER AND BUDD LAKE BY 520 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORM HAVE A HISTORY OF PRODUCING QUARTER SIZED HAIL...AND 
HAVE THE POTENTIAL TO GENERATE DAMAGING WINDS. ALSO...DANGEROUS 
CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. MOVE 
INDOORS IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

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 800 PM EDT SUNDAY
EVENING FOR NORTHERN NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4089 7428 4090 7433 4082 7432 4080 7436
      4075 7439 4091 7508 4102 7473 4105 7445
      4102 7443 4100 7430 4098 7428 4092 7429
      4091 7427
TIME...MOT...LOC 2101Z 286DEG 22KT 4106 7438 4093 7467
          4091 7492

$$

MPD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 3:11 PM EDTSpecial Weather StatementPHIWarren79 min
Jul 1, 3:25 PM EDTSevere Thunderstorm WarningPHISussex, Warren65 min
Jul 1, 4:38 PM EDTSpecial Weather StatementPHIMiddlesex52 min
Jul 1, 5:31 PM EDTSpecial Weather StatementPHIMorris59 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.