Alert archive / New Jersey / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 30, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 5, 1987, 2:34 PM EDT for Camden County, Gloucester County, New Jersey. It was in force for 41 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 5, 1987, 2:34 PM EDT (18:34 UTC)
- Expired
- Aug 5, 1987, 3:15 PM EDT
- In force
- 41 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Camden County, NJ, Gloucester County, NJ
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 5, 2:58 PM EDT | Thunderstorm Wind 0 | Camden, NJ |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Atlantic City In, NJ (KACY), launched 12:00Z, 6.6 hours before the alert went out and 58 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.
- Mixed-layer CAPE
- 345 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1140 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 051834 SVRPHL NJC007-015-051930- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA PA 234 PM EDT WED AUG 5 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 330 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTHWEST NEW JERSEY...EASTERN CAMDEN AND EASTERN GLOUCESTER AT 230 PM RADAR INDICATED A SEVERE THUNDERSTORM NEAR WILLIAMSTOWN IN EASTERN GLOUCESTER COUNTY. THE THUNDERSTORM WAS SHOWING VERY LITTLE MOVEMENT. THIS IS A DANGEROUS STORM AND PEOPLE IN THE WARNED AREA SHOULD BE PREPARED FOR STRONG DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN AND LIGHTNING. SHOULD THE STORM APPROACH YOU...SEEK IMMEDIATE SHELTER. MOBILE HOMES ARE MOST VULNERABLE TO HIGH WINDS AND SHOULD BE AVOIDED. JWH
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 5, 10:46 AM EDT, 3 hours 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PHILADELPHIA, PA 1046 AM EDT WED AUG 05 1987 ...THUNDERSTORM POTENTIAL AND EXCESSIVE RAINFALL POTENTIAL FOR EASTERN PENNSYLVANIA AND SOUTHERN NEW JERSEY... SHOWERS AND EMBEDDED THUNDERSTORMS WERE OVER SOUTH CENTRAL AND SOUTHWESTERN PENNSYLVANIA THIS MORNING. THIS AREA OF PRECIPITATION WILL SPREAD EAST INTO SOUTHEASTERN PENNSYLVANIA AND SOUTHERN NEW JERSEY THIS AFTERNOON. LOCALLY HEAVY RAINS KCOULD OCCUR AS THE SHOWERS AND THUNDERSTORMS SPREAD ACROSS SOUTHEASTERN PENNSYLVANIA AND SOUTHERN NEW JERSEY AND FLOODING OF POOR DRAINAGE AREAS IS POSSIBLE. RNS
Special weather statement, Aug 5, 1:50 PM EDT, 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PHILADELPHIA, PA 145 PM EDT WED AUG 05 1987 ...VERY STRONG THUNDERSTORMS ARE DEVELOPING OVER EXTREME SOUTHEASTERN PENNSYLVANIA AND SOUTHERN NEW JERSEY... AT 145 PM EDT...NATIONAL WEATHER SERVICE RADAR WAS SHOWING STRONG THUNDERSTORMS SCATTERED THROUGH THE PHILADELPHIA METROPOLITAN AREA AND OVER SOUTHERN NEW JERSEY. THE HEAVIEST THUNDERSTORMS WERE LOCATED OVER DELAWARE COUNTY AND SOUTHEAST MONTGOMERY COUNTY IN PENNSYLVANIA. IN NEW JERSEY...A HEAVY THUNDERSTORM WAS OVER SOUTHWESTERN BURLINGTON AND WESTERN CAMDEN COUNTIES WITH A SECOND THUNDERSTORM OVER SALEM COUNTY. THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 20 MPH BUT THUNDERSTORMS COULD DeEVELOP OVER MOST ANY AREA IN SOUTHEAST PENNSYLVANIA AND SOUTHERN NEW JERSEY THROUGH THIS EVENING. HEAVY RAIN...STRONG GUSTY WINDS AND HAIL ARE POSSIBLE WITH THE THUNDERSTORMS THIS AFTERNOON AND EVENING. RNS
Special weather statement, Aug 5, 2:02 PM EDT, 32 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 200 PM EDT WED AUG 5 1987 AT 130 PM EDT STRONG TO VERY STRONG THUNDERSTORMS HAVE DEVELOPED RAPIDLY OVER SOUTHWEST NEW JERSEY AND NORTHEAST NARYLAND. OTHER SHOWERS AND THUNDERSTORMS WERE OVER EASTERN PENNSYLVANIA AND ACROSS EXTREME NORTHERN NEW JERSEY INTO SOUTHEAST NEW YORK STATE. THE HEAVIEST THUNDERSTORMS WERE OVER SALEM AND BURLINGTON COUNTIES OF SOUTHERN NEW JEvRSEY AND ALSO IN THE WASHINGTON DC AREA. MOVEMENT WAS TO THE NORTHEAST AT 15 TO 20 MILES AN HOUR. JGV
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 3:09 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic | 61 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 1987Every severe thunderstorm warning in 1987
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.