Alert archive / New Jersey / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 9, NWS Philadelphia/Mount Holly

May 12, 1994Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 12, 1994, 1:04 PM EDT for Mercer County, New Jersey. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
May 12, 1994, 1:04 PM EDT (17:04 UTC)
Expired
May 12, 1994, 1:45 PM EDT
In force
41 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Mercer County, NJ

The nearest sounding before it

Atlantic City In, NJ (KACY), launched 12:00Z, 5.1 hours before the alert went out and 94 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, Atlantic City In, NJ at 12:00Z on 1994-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 19 joules per kilogram.LCLLFCEL10008507005003002001001 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, Atlantic City In, NJ at 12:00Z on 1994-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 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
19 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
717 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
264 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 
WUUS1 KPHL 121709 RRA
SVRPHL
NJC021-121745-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
104 PM EDT THU MAY 12 1994
 
THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 145 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN WEST CENTRAL NEW JERSEY
 
   ...MERCER COUNTY
 
DOPPLER RADAR SHOWED A DEVELOPING SEVERE THUNDERSTORM ABOUT TO
ENTER MERCER COUNTY NEAR TITUSVILLE.  MOVEMENT WAS EAST AT 30
MILES AN HOUR.  THESE THUNDERSTORMS HAVE HAD A DUAL THREAT OF
BOTH DAMAGING WIND GUSTS AND LARGE HAIL.  IF IT KEEPS THE
PRESENT COURSE THE THUNDERSTORM WILL PASS CLOSE TO PENNINGTON
AND PRINCETON DURING THE NEXT HALF HOUR.
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN THE WARNED AREA...PREPARE
FOR STRONG DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN AND DEADLY
LIGHTNING.  SHOULD THE STORM APPROACH YOU...SEEK IMMEDIATE SHELTER
INDOORS...BUT DO NOT STAND NEAR WINDOWS.  MOBILE HOMES ARE MOST
VULNERABLE TO HIGH WINDS AND SHOULD BE AVOIDED.

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 1:37 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden53 min
May 12, 4:02 PM EDTSevere Thunderstorm WarningPHIMercer28 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 1994Every severe thunderstorm warning in 1994

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.