Alert archive / New Jersey / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 28, NWS Philadelphia/Mount Holly

July 7, 1991Burlington County, Camden County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 7, 1991, 12:17 PM EDT for Burlington County, Camden County, New Jersey. It was in force for 58 min. 5 reports 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
Jul 7, 1991, 12:17 PM EDT (16:17 UTC)
Expired
Jul 7, 1991, 1:15 PM EDT
In force
58 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

Counties Burlington County, NJ, Camden County, NJ

What was reported inside it

TimeReportWhereRemark
Jul 7, 12:18 PM EDTThunderstorm Wind 53Burlington, NJ
Jul 7, 12:25 PM EDTHail 0.75Camden, NJ
Jul 7, 12:43 PM EDTThunderstorm Wind 52Burlington, NJ
Jul 7, 12:45 PM EDTThunderstorm Wind 0Burlington, NJ
Jul 7, 12:50 PM EDTThunderstorm Wind 0Camden, 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, 4.3 hours before the alert went out and 51 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 1991-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1207 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°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 1991-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 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
1207 J/kg
Mixed-layer CIN
-109 J/kg
Mixed-layer LCL
1172 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
67 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 
TTAA00 KPHL 071617
SVRPHL
NJC005-007-015-033-021-071715-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA PA
1217 PM EDT SUN JUL 7 1991
 
THE NATIONAL WEATHER SERVICE IN

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, Jul 7, 11:12 AM EDT, 1 hour 5 minutes before
DEZ003-002-001-071700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON DE
1108 AM EDT SUN JUL 7 1991

AT 11 PM NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF THUNDERSTORMS
LOCATED FROM 25 MILES NORTHWEST OF THE NEW CASTLE COUNTY AIRPORT TO
AROUND 30 MILES WEST TO AROUND 45 MILES WEST NORTHWEST OF DOVER. THESE
ARE MOVING TOWARD THE EAST AT 25 TO 30 MILES PER HOUR AND WILL BE
MOVING INTO NORTHERN AND PARTS OF CENTRAL DELAWARE AFTER 12 NOON. SOME
BRIEF HEAVY RAIN...DANGEROUS LIGHTNING...AND STRONG GUSTY WINDS CAN BE
EXPECTED WITH THESE THUNDERSTORMS.
THE STATE POLICE IN BELAIR MARYLAND REPORTED ONE TREE BLOWN DOWN SO
FAR...BUT NO DETAILS ON SIZE.
Special weather statement, Jul 7, 11:16 AM EDT, 1 hour 1 minute before
DEZ003-002-001-071700-

SPECIAL WEATHER STATEMENT CORRECTION
NATIONAL WEATHER SERVICE WILMINGTON DE
1108 AM EDT SUN JUL 7 1991

AT 11 AM NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF THUNDERSTORMS
LOCATED FROM 25 MILES NORTHWEST OF THE NEW CASTLE COUNTY AIRPORT TO
AROUND 30 MILES WEST...TO AROUND 45 MILES WEST NORTHWEST OF DOVER. THESE
ARE MOVING TOWARD THE EAST AT 25 TO 30 MILES PER HOUR AND WILL BE
MOVING INTO NORTHERN AND PARTS OF CENTRAL DELAWARE AFTER 12 NOON. SOME
BRIEF HEAVY RAIN...DANGEROUS LIGHTNING...AND STRONG GUSTY WINDS CAN BE
EXPECTED WITH THESE THUNDERSTORMS.
THE STATE POLICE IN BELAIR MARYLAND REPORTED ONE TREE BLOWN DOWN SO
FAR...BUT NO DETAILS ON SIZE.
CS
Special weather statement, Jul 7, 11:23 AM EDT, 54 minutes before
PAZ011-016-071630-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ALLENTOWN PA
1115 AM EDT SUN JUL 7 1991

...SEVERE THUNDERSTORM WATCH UNTL 5 PM EDT FOE EASTERN PENNSYLVANIA...
...VERY HEAVY THUNDERSTORM IN SOUTHERN BERKS COUNTY...

AT 1110 AM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A VERY HEAVY
THUNDERSTORM IN SOUTHERN BERKS COUNTY MOVING SOUTHEAST AROUND 35 MPH.
ALSO...A LINE OF HEAVY THUNDERSTORMS EXTENDS FROM STROUDSBURG TO CHESTER
COUNTY. THIS LINE IS MOVING SOUTHEAST AROUND 35 MPH AND WILL MOVE ACROSS
SOUTHEASTERN PENNSYLVANIA AND WEST CENTRAL NEW JERSEY BETWEEN 1115 AM AND
1230 PM.

PEOPLE LIVING IN SOUTHEASTERN PENNSYLVANIA AND WEST CENTRAL NEW JERSEY
SHOULD SEEK SHELTbER WHEN THESE STORMS ARRIVE.

REMEMBER...A SEVERE THUNDERSTORMS WATCH MEANS ATMOSPHERIC CONDITIONS
ARE FAVORABLE FOR SEVERE THUNDERSTORM DEVELOPMENT IN AND NEAR
THE WATCH AREA.

DOVICO
Special weather statement, Jul 7, 11:31 AM EDT, 46 minutes before
PAZ011-016-071630-

SPECIAL WEATHER STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE ALLENTOWN PA
1115 AM EDT SUN JUL 7 1991

...SEVERE THUNDERSTORM WATCH UNTL 5 PM EDT FOR EASTERN PENNSYLVANIA...
...VERY HEAVY THUNDERSTORM IN SOUTHERN BERKS COUNTY...

AT 1110 AM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A VERY HEAVY
THUNDERSTORM IN SOUTHERN BERKS COUNTY MOVING SOUTHEAST AROUND 35 MPH.
ALSO...A LINE OF HEAVY THUNDERSTORMS EXTENDS FROM STROUDSBURG SOUTHWEST
TO CHESTER COUNTY. THIS LINE IS MOVING SOUTHEAST AROUND 35 MPH AND WILL
MOVE ACROSS SOUTHEASTERN PENNSYLVANIA AND WEST CENTRAL NEW JERSEY BETWEEN
1115 AM AND 1230 PM.

PEOPLE LIVING IN SOUTHEASTERN PENNSYLVANIA AND WEST CENTRAL NE4W JERSEY
SHOULD SEEK SHELTER WHEN THESE STORMS ARRIVE.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS ATMOSPHERIC CONDITIONS
ARE FAVORABLE FOR SEVERE THUNDERSTORM DEVELOPMENT IN AND NEAR
THE WATCH AREA.

DOVICO
Special weather statement, Jul 7, 11:51 AM EDT, 26 minutes before
NJZ002>004-006-071645

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE ATLANTIC CITY NJ
1140 AM EDT SUN JUL 7 1991

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR SOUTHERN NEW JERSEY AND THE
ADJACENT COASTAL WATERS UNTIL 5 PM EDT...

AT 1132 AM...OUR WEATHER SEARCH RADAR SHOWED A LINE OF THUNDERSTORMS WITH
VERY HEAVY RAINS...STRONG GUSTY WINDS...FREQUENT DANGEROUS LIGHTNING AND
POSSIBLE HAIL IN EASTERN PENNSYLVANIA FROM EASTON TO PARKERSBURG IN THE
LOWER SUSQUEHANNA VALLEY OF PENNSYLVANAI TO BEL AIR NORTHEAST CORNER OF
MARYLAND. THIS LINE WAS MOVING EAST AT NEAR 20 MILES AN HOUR WHILE THE STORMS
MOVED EAST AT 30 MILES AN HOUR. THIS WOULD BRING THEM INTO WESTERN CENTRAL
NEW JERSEY AND SOUTHEAST PENNSYLVANIA...NORTHERN DELAWARE DURING THE NEXT
HOUR.

ELSEWHERE...SCATTERED SHOWERS AND THUNERSTORMS...SOME WITH HEAVY RAIN WERE
SCATTERED FROM SOUTHEAST NEW YORK STATE INTO NORTHEAST PENNSYLVANIA THEN
ACROSS EASTERN AND SOUTHEAST PENNSYLVANIA...MIDDLE AND LOWER SUSQUEHANNA

VALLEY OF PENNSYLVANIA INTO NORTHEAST AND CENTRAL MARYLAND.
THESE STORMS COULD EVEN MAKE THE WESTERN PORTIONS OF SOUTHERN
NEW JERSEY WITHIN THE NEXT HOUR.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS AND POSSIBLE TORNADOES IN AND
CLOSE TO THE WATCH AREA. PERSONS IN THESES AREAS SHOULD BE ON THE
LOOKOUT FOR THREATENING WEATHER CONDITIONS AND BE PREPARED TO
SEEK SHELTER.

LISTEN TO NOAA WE,ATHER RADIO OR YOUR LOCAL TV OR RADIO STATIONS FOR
LATER STATEMENTS OR POSSIBLE WARNINGS.

THIS WATCH AREA ALSO EXTENDED INTO NORTHERN NEW JERSEY...SOUTHEAST
NEW YORK STATE...CENTRAL AND SOUTHERN PENNSYLVANIA AND DELAWARE.

FXD/JH
Special weather statement, Jul 7, 12:02 PM EDT, 15 minutes before
PAZ012-NJZ002-072100-

SPECIAL WEATHER STATEMENT - SEVERE THUNDERSTORM WATCH
NATIONAL WEATHER SERVICE PHILADELPHIA PA
1200 NOON EDT SUN JUL 7 1991

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 5 PM EDT TODAY FOR
   MOST OF CENTRAL AND SOUTHERN PENNSYLVANIA AND ALL OF SOUTHERN
   NEW JERSEY INCLUDING ADJACENT COASTAL WATERS...

AT 12 NOON NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF HEAVY
THUNDERSTORMS JUST WEST OF THE DELAWARE RIVER FROM EAST OF ALLENTOWN
INTO DELAWARE. THESE WERE MOVING TOWARD THE EAST AT AROUND 35 MILES AN
HOUR. OVER THE NEXT COUPLE HOURS THEY WILL EXIT PENNSYLVANIA AND MOVE
THROUGH MERCER...BURLINGTON...CAMDEN...GLOUCESTER AND SALEM COUNTIES
OF SOUTHERN NEW JERSEY.

DAMAGING WIND GUSTS...HAIL...HEAVY DOWNPOURS AND FREQUENT LIGHTNING
HAVE BEEN REPOTED OVER SOUTHEASTERN PENNSYLVANIA AS THESE STORMS MOVED
THROUGH.

BE PREPARED TO SEEK SHELTER IF THREATENING WEATHER APPROACHES.
FURTHER STATEMENTS OR WARNINGS WILL BE ISSUED AS NEEDED.

NC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 12:17 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem58 min
Jul 7, 12:17 PM EDTSevere Thunderstorm WarningPHIMercer58 min
Jul 7, 12:42 PM EDTSevere Thunderstorm WarningPHICumberland63 min
Jul 7, 1:10 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Ocean65 min
Jul 7, 1:42 PM EDTSevere Thunderstorm WarningPHICape May63 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 1991Every severe thunderstorm warning in 1991

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.