Alert archive / New Jersey / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 103, NWS Philadelphia/Mount Holly

August 21, 1994Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 21, 1994, 10:07 PM EDT for Mercer County, New Jersey. It was in force for 33 min.

The area

The counties it named.

The facts

Issued
Aug 21, 1994, 10:07 PM EDT (02:07 UTC)
Expired
Aug 21, 1994, 10:40 PM EDT
In force
33 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 00:00Z, 2.1 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 00:00Z on 1994-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1396 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 00:00Z on 1994-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 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
1396 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
713 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.5
Supercell composite
4.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPHL 220209 RRA
SVRPHL
NJC021-220300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
1007 PM EDT SUN AUG 21 1994
 
THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1100 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN WEST CENTRAL NEW JERSEY
 
   ...MERCER COUNTY
 
AT 1005 PM WEATHER SERVICE RADAR INDICATED A SEVERE
 
THUNDERSTORM IN EXTREME SOUTHERN MERCER COUNTY NEAR YARDVILLE.
THIS THUNDERSTORM MAY HAVE WINDS OVER 60 MPH...VERY HEAVY
RAIN...AND FREQUENT LIGHTNING.
     REMEMBER...A SEVERE THUNDERSTORM MAY PRODUCE A TORNADO.
     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.
 
HEAVY RAINS WITH THIS THUNDERSTORM MAY CAUSE FLOODING OF SMALL
STREAMS AND UNDERPASSES VERY QUICKLY.  DO NOT DRIVE YOUR CAR INTO
AREAS WHERE THE WATER COVERS THE ROADWAY.  THE WATER MAY BE DEEPER
THAN YOU THINK.  IF CAUGHT IN RISING WATERS...ABANDON YOUR CAR
QUICKLY.  MOVE TO HIGHER GROUND.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 8:46 PM EDTSevere Thunderstorm WarningPHIGloucester44 min
Aug 21, 8:50 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cumberland55 min
Aug 22, 1:25 AM EDTFlash Flood WarningPHIMercer95 min
Aug 22, 3:15 AM EDTFlash Flood WarningPHIMercer3 hr
Aug 22, 4:37 PM EDTFlash Flood WarningPHIMercer3 hr
Aug 22, 5:06 PM EDTFlash Flood WarningPHICamden4 hr

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.