Alert archive / New Jersey / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 47, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 20, 1991, 3:45 PM EDT for Salem County, New Jersey. It was in force for 45 min.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1991, 3:45 PM EDT (19:45 UTC)
- Expired
- Aug 20, 1991, 4:30 PM EDT
- In force
- 45 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Salem County, NJ
The nearest sounding before it
Atlantic City In, NJ (KACY), launched 12:00Z, 7.8 hours before the alert went out and 75 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
- 772 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 615 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KPHL 201945
SVRPHL
NJC033-202030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA PA
345 PM EDT TUE AUG 20 1991
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 430 PM EDT FOR PEOPLE IN THE FOLLOWING
COUNTY
IN THE SOUTHWEST PART OF NEW JERSEY
SALEM
AT 340PM RADAR INDICATED A SEVERE THUNDERSTORM OVER SALEM
COUNTY NEAR WOODSTOWN MOVING SLOWLY NORTH.
WEATHER SPOTTER RPORTED 60 MPH WINDS AND EXTREMELY HEAVY RAINS.
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.
A SEVERE THUNDERSTORM WATCH CONTINUES FOR IN EFFECT FOR ALL OF
SOUTHERN NEW JERSEY UNTIL 5 PM EDT.
HEAVY RAINS WITH THIS THUNDERSTORM MAY CAUSE FLKOODING
OF SMALL STREAMS AND UNDERPASSES.
WNWhat 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 20, 12:34 PM EDT, 3 hours 11 minutes before
PAZ011-016-201730- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALLENTOWN PA 1225 PM EDT TUE AUG 20 1991 ...SMALL STREAM AND URBAN FLOOD WATCH FOR EAST CENTRAL PENNSYLVANA FOR THIS AFTERNOON AND EVENING... ...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL PENNSYLVANIA UNTIL 5 PM EDT... AT 1225 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A 75 MILE WIDE BAND OF HEAVY SHOWERS AND THUNDERSTORMS EXTENDED FROM LYCOMING AND SULLIVAN COUNTIES IN NORTH CENTRAL PENNSYLVANIA SOUTHEAST TO LANCASTER... ...CHESTER AND PHILADELPHIA COUNTIES IN SOUTHEASTERN PENNSYLVANIA. THE BAND IS MOVING EAST NORTHEAST AT 30 MPH AND WILL MOVE THROUGH EASTERN PENNSYLVANIA BETWEEN 1230 PM AND 3 PM EDT. HEAVY DOWNPOURS MAY RESULT IN SMALL STREAM AND URBAN FLOODING. A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EAST CENTRAL PENNSYLVANIA UNTIL 5 PM. THE WATCH AREA INCLUDES BERKS...SCHUYLKILL...LEHIGH... NORTHAMPTON...CARBON AND MONROE COUNTIES. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. DOVICO
Special weather statement, Aug 20, 1:05 PM EDT, 2 hours 40 minutes before
NJZ002>004-200245 SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 1230 PM EDT TUE AUG 20 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 500PM THIS AFTERNOON... AT 1230 PM EDT...THE ATLANTIC CITY WEATHER RADAR DETECTED AN AREA OF THUNDERSTORMS WITH VERY HEAVY RAIN OVER CHESTER AND MONTGOMERY COUNTIES OF SOUTHEASTERN PENNSYLVANIA. IN CHESTER COUNTY...TWO INCHES OF RAIN WAS REPORTED IN TWELVE MINUTES. THESE STORMS WERE PART OF A LARGER AREA OF SHOWERS STRETCHING FROM NORTHERN DELAWARE INTO NORTHEASTERN PENNSYLVANIA WITH THE HEAVIEST ACTIVITY ABOUT 20 MILES NORTHWEST OF PHILADELPHIA. SCATTERED SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN WERE OVER NORTHEASTERN MARYLAND AND CENTRAL NEW JERSEY. . ELSEWHERE...SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN WERE OVER THE OCEAN BETWEEN 50 AND 125 EAST OF THE NEW JERSEY AND DELMARVA COASTS. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORM IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE OUTLOOK FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS. AT THIS TIME NO SEVERE WEATHER WAS OCCURRING IN SOUTHERN NEW JERSEY. SJG/PM
Local storm report, Aug 20, 1:16 PM EDT, 2 hours 29 minutes before
STORM REPORT NATIONAL WEATHER SERVICE PHILADELPHIA, PA 115 PM EDT TUE AUG 20 1991 PRELIMINARY HEAVY RAINFALL REPORTS FOR TUE AUGUST 20 1991 TIME (EDT) COUNTY LOCATION EVENT 1315 + MONTGOMERY GLENSIDE 2.15 INCHES IN 20 MIN. WN
Special weather statement, Aug 20, 1:59 PM EDT, 1 hour 46 minutes before
NJZ002>004-200245 SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 133 PM EDT TUE AUG 20 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 5PM EDT FOR ALL OF SOUTHERN NEW JERSEY... AT 133 PM EDT...THE ATLANTIC CITY WEATHER RADAR DETECTED AN AREA OF THUNDERSTORMS WITH VERY HEAVY RAIN OVER BUCKS AND CHESTER COUNTIES OF SOUTHEASTERN PENNSYLVANIA. AN ISOLATED THUNDERSTORM WITH VERY HEAVY RAIN WAS ALSO IN SALEM COUNTY OF SOUTHERN NEW JERSEY. THESE STORMS WERE PART OF A LARGER AREA OF SHOWERS THAT STRETCHED FROM SOUTHWESTERN NEW JERSEY INTO NORTHEASTERN PENNSYLVANIA WITH THE HEAVIEST ACTIVITY BETWEEN 10 AND 40 MILES NORTH OF PHILADELPHIA. OTHER SCATTERED SHOWERS AND THUNDERSTORMS WERE OVER CENTRAL NEW JERSEY AND NORTHEASTERN MARYLAND. ELSEWHERE...SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN WERE OVER THE OCEAN BETWEEN 50 AND 125 EAST OF THE NEW JERSEY AND DELMARVA COASTS. MOVEMENT WAS NORTHEAST AT AROUND 30 MILES AN HOUR. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORM IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE OUTLOOK FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS. SJG/PM
Special weather statement, Aug 20, 2:52 PM EDT, 53 minutes before
NJZ002>004-201950- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 245 PM EDT TUE AUG 20 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 5PM EDT FOR ALL OF SOUTHERN NEW JERSEY AND ADJACENT COASTAL WATERS... AT 234 PM EDT...THE ATLANTIC CITY WEATHER RADAR DETECTED A SMALL BAND OF POSSIBLE SEVERE THUNDERSTORMS WITH HAIL...INTENSE DOWNPOURS...GUSTY WINDS AND FREQUENT DANGEROUS LIGHTNING IN NORTHERN NEW JERSEY EXTENDING FROM SOUTHERN MORRIS COUNTY INTO SOMERSEY COUNTY AND MOVING INTO ESSEX AND UNION COUNTIES. FLASH FLOOD WARNING HAVE BEEN ISSUED FOR THESE COUNTIES. MOVEMENT WAS NORTHNORTHEAST AT 20 TO 25 MILES AN HOUR. OTHER THUNDERSTORMS WITH VERY HEAVY RAINS AND POSSIBLE GUSTY WINDS WERE INDICATED ALONG THE NORTHERN NEW JERSEY COASTA AND COASTAL WATERS FROM SANDY HOOK TO MANASQUAN...CAMDEN AND MAPLE SHADE WESTERN SOUTHERN NEW JERSEY ...CHESTER COUNTY SOUTHEAST PENNSYLVANIA AND NEAR ANNAPOLIS MARYLAND. SHOWERS AND THUNDERSTORMS...SOME WITH HEAVY RAIN...WERE SCATTERED OVER CENTRAL AND NORTHERN NEW JERSEY...EXTREME WESTERN SOUTHERN NEW JERSEY... NORTHEAST INTO EASTERN AND SOUTHEAST PENNSYLVANIA...CENTRAL MARYLAND AND OVER THE OCEAN FROM 25 TO 130 MILES EAST OF THE NEW JERSEY AND DELMARVA COASTS. MOVEMENT WAS NORTHEAST AT 20 TO 25 MILES AN HOUR. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSO7NS IN THESE AREAS SHOULD BE ON THE OUTLOOK FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS. SJG/PM/FXD
Special weather statement, Aug 20, 3:44 PM EDT, 1 minute before
DEZ003-002-202145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 339 PM EDT TUE AUG 20 1991 ...THUNDERSTORMS MOVING TOWARDS DELAWARE... AS OF 330 PM EDT WEATHER SERVICE RADAR INDICATES THUNDERSTORMS DEVELOPING RAPIDLY ACROSS THE STATE OF DELAWARE. AN AREA OF THUNDERSTORMS LOCATED IN QUEEN ANNES AND KENT COUNTIES OF MARYLAND WILL BE MOVING TO THE NORTHEAST INTO NORTHERN KENT COUNTY AND NEW CASTLE COUNTIES OF DELAWARE. ANOTHER AREA OF STORMS ARE LOCATED IN SOUTHERN NEW CASTLE COUNTY MOVING NORTHEAST ACROSS THE DELAWARE RIVER INTO NEW JERSEY TOWARDS SALEM NEW JERSEY. THESE STORMS ARE MOVING TO THE NORTH NORTHEAST AT ABOUT 30 TO 35 MPH. THEY MAY BE ACCOMPANIED BY STRONG GUSTY WINDS...HEAVY RAIN...AND DANGEROUS LIGHTNING. IF YOU SEE THREATENING WEATHER APPROACHING SEEK SHELTER IMMEDIATELY...AND LISTEN FOR THE LATEST INFORMATION ON LOCAL TV...RADIO AND NOAA WEATHER RADIO. THE STORMS IN MARYLAND WIXLL BE MOVING ACROSS NORTHERN DELAWARE WITHIN THE NEXT 1 TO 2 HOURS. VAUGHAN
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 1:45 PM EDT | Flash Flood Warning | PHI | Mercer | 60 min |
| Aug 20, 6:56 PM EDT | Flash Flood Warning | PHI | Mercer | 3 hr |
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; the sounding from the Mesonet's radiosonde archive.