Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 124, NWS Philadelphia/Mount Holly

July 17, 2009Morris County, Sussex County, Warren County, New Jersey; Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2009, 5:41 PM EDT for Morris County, Sussex County, Warren County, New Jersey; Northampton County, Pennsylvania. It was in force for 52 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 17, 2009, 5:41 PM EDT (21:41 UTC)
Expired
Jul 17, 2009, 6:33 PM EDT
In force
52 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Morris County, NJ, Sussex County, NJ, Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 119 km from the middle of the area, began a volume at 21:43 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.7 hours before the alert went out and 172 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 2009-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 95 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 2009-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 square meters per square second.19395878Sfc1 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
95 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
1120 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
62 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.

000 
WUUS51 KPHI 172141
SVRPHI
NJC027-037-041-PAC095-172245-
/O.NEW.KPHI.SV.W.0124.090717T2141Z-090717T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
541 PM EDT FRI JUL 17 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  WESTERN MORRIS COUNTY IN NORTHERN NEW JERSEY...
  SOUTHWESTERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  THIS INCLUDES THE CITY OF NEWTON...
  WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 645 PM EDT

* AT 540 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HARMONY...OR NEAR EASTON...AND MOVING NORTHEAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ROXBURG...PLEASANT VALLEY...BRASS CASTLE...BELVIDERE...
  WASHINGTON...OXFORD...HOPE...GREAT MEADOWS...GREAT
  MEADOWS-VIENNA...BLAIRSTOWN...HACKETTSTOWN...ALLAMUCHY...
  ALLAMUCHY-PANTHER VALLEY...BUDD LAKE...STANHOPE...FIVE POINTS...
  ANDOVER...HOPATCONG AND LAKE MOHAWK

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HAIL UP TO THE SIZE OF A QUARTER HAS BEEN REPORTED IN FORK TOWNSHIP
WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE 
IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4117 7478 4097 7454 4066 7514 4075 7529
TIME...MOT...LOC 2141Z 233DEG 25KT 4073 7515

$$

MPD
2 follow-up statements
000 
WWUS51 KPHI 172201
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
601 PM EDT FRI JUL 17 2009

PAC095-172209-
/O.CAN.KPHI.SV.W.0124.000000T0000Z-090717T2245Z/
NORTHAMPTON PA-
601 PM EDT FRI JUL 17 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NORTHAMPTON
COUNTY IS CANCELLED...

LAT...LON 4077 7505 4084 7504 4091 7507 4117 7478
      4097 7454
TIME...MOT...LOC 2159Z 233DEG 25KT 4080 7502

$$

NJC027-037-041-172245-
/O.CON.KPHI.SV.W.0124.000000T0000Z-090717T2245Z/
SUSSEX NJ-WARREN NJ-MORRIS NJ-
601 PM EDT FRI JUL 17 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTH CENTRAL MORRIS...NORTHEASTERN WARREN AND SOUTHWESTERN
SUSSEX COUNTIES...

AT 559 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED JUST NORTHWEST OF OXFORD...OR ABOUT 15 MILES NORTHEAST OF 
EASTON...MOVING NORTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HOPE...
GREAT MEADOWS...GREAT MEADOWS-VIENNA...BLAIRSTOWN...ALLAMUCHY...
ALLAMUCHY-PANTHER VALLEY...STANHOPE...FIVE POINTS...ANDOVER...
HOPATCONG...NEWTON AND LAKE MOHAWK

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS UP TO AROUND 60 MPH WERE REPORTED NEAR EASTON WITH 
THIS STORM. THIS IS A DANGEROUS STORM...SEEK SAFE SHELTER AND STAY 
AWAY FROM WINDOWS

HAIL UP TO THE SIZE OF QUARTERS HAS BEEN REPORTED IN FORKS TOWNSHIP 
WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE 
IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4077 7505 4084 7504 4091 7507 4117 7478
      4097 7454
TIME...MOT...LOC 2159Z 233DEG 25KT 4080 7502

$$

MPD
000 
WWUS51 KPHI 172233
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
633 PM EDT FRI JUL 17 2009

NJC027-037-041-172244-
/O.CAN.KPHI.SV.W.0124.000000T0000Z-090717T2245Z/
SUSSEX NJ-WARREN NJ-MORRIS NJ-
633 PM EDT FRI JUL 17 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MORRIS...
NORTHEASTERN WARREN AND SOUTHWESTERN SUSSEX COUNTIES IS CANCELLED...

LAT...LON 4077 7505 4084 7504 4091 7507 4117 7478
      4097 7454
TIME...MOT...LOC 2234Z 233DEG 25KT 4095 7476

$$

MPD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 6:25 PM EDTAreal Flood AdvisoryPHISalem113 min
Jul 17, 7:33 PM EDTAreal Flood AdvisoryPHIGloucester, Salem86 min
Jul 17, 6:10 PM EDTSevere Thunderstorm WarningPHIChester80 min
Jul 17, 7:07 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Montgomery53 min
Jul 17, 7:22 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia53 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009Severe Thunderstorm Warnings in Pennsylvania, 2009Every severe thunderstorm warning in 2009

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.