Alert archive / New Jersey / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 112, NWS Philadelphia/Mount Holly

August 21, 20155 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 21, 2015, 1:02 AM EDT for 5 counties in New Jersey. It was in force for 37 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
Aug 21, 2015, 1:02 AM EDT (05:02 UTC)
Expired
Aug 21, 2015, 1:39 AM EDT
In force
37 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 31 km from the middle of the area, began a volume at 05:03 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 00:00Z, 5.0 hours before the alert went out and 151 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 00:00Z on 2015-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 178 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 00:00Z on 2015-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
178 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
657 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
121 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.

834 
WUUS51 KPHI 210502
SVRPHI
NJC005-021-023-025-029-210600-
/O.NEW.KPHI.SV.W.0112.150821T0502Z-150821T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
102 AM EDT FRI AUG 21 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  CENTRAL MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  SOUTHEASTERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  NORTH CENTRAL OCEAN COUNTY IN SOUTHERN NEW JERSEY...
  NORTH CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 200 AM EDT

* AT 101 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THIS STORM WAS LOCATED OVER ALLENTOWN...OR 8 MILES EAST
  OF TRENTON...AND MOVING EAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  OLD BRIDGE...HOWELL...MARLBORO...MANALAPAN...TINTON FALLS...
  HOLMDEL...MATAWAN...JAMESBURG...HIGHTSTOWN...CRANBURY...
  ALLENTOWN...FARMINGDALE...ROOSEVELT...TWIN RIVERS...CLARKSBURG...
  YORKETOWN...COLLINGWOOD PARK...IMLAYSTOWN...EAST FREEHOLD AND VISTA
  CENTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
ALTHOUGH A TORNADO IS NOT IMMEDIATELY LIKELY...IF ONE IS SPOTTED...
ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4013 7464 4026 7469 4043 7417 4016 7408
TIME...MOT...LOC 0501Z 255DEG 22KT 4021 7459 

$$

HEAVENER
1 follow-up statement
689 
WWUS51 KPHI 210539
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
139 AM EDT FRI AUG 21 2015

NJC005-021-023-025-029-210549-
/O.CAN.KPHI.SV.W.0112.000000T0000Z-150821T0600Z/
MERCER NJ-MONMOUTH NJ-MIDDLESEX NJ-OCEAN NJ-BURLINGTON NJ-
139 AM EDT FRI AUG 21 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MERCER...CENTRAL
MONMOUTH...SOUTHEASTERN MIDDLESEX...NORTH CENTRAL OCEAN AND NORTH
CENTRAL BURLINGTON COUNTIES IS CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED. HOWEVER HEAVY RAIN IS STILL
POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4013 7464 4026 7469 4043 7417 4016 7408
TIME...MOT...LOC 0537Z 255DEG 22KT 4032 7406 

$$

HEAVENER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 11:18 PM EDTSpecial Weather StatementPHIHunterdon, Mercer57 min
Aug 20, 11:35 PM EDTAreal Flood AdvisoryPHIBurlington, Hunterdon, Mercer, Middlesex, Somerset4 hr
Aug 21, 12:46 AM EDTFlash Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Somerset4 hr
Aug 21, 12:51 AM EDTSpecial Weather StatementPHIMercer39 min
Aug 21, 1:38 AM EDTAreal Flood AdvisoryPHIAtlantic, Cape May, Cumberland, Gloucester, Salem4 hr
Aug 21, 2:30 AM EDTAreal Flood AdvisoryPHISussex4 hr
Aug 21, 3:10 AM EDTFlash Flood WarningPHICape May4 hr
Aug 21, 4:31 AM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth, Ocean4 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2015Every severe thunderstorm warning in 2015

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.