Alert archive / New Jersey / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 48, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 20, 1991, 9:13 PM EDT for Cape May County, New Jersey. It was in force for 62 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 20, 1991, 9:13 PM EDT (01:13 UTC)
- Expired
- Aug 20, 1991, 10:15 PM EDT
- In force
- 62 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Cape May County, NJ
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 20, 9:40 PM EDT | Thunderstorm Wind 52 | Cape May, 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 00:00Z, 1.2 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.
- Mixed-layer CAPE
- 842 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 593 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KACY 210113 SVRACY NJC009-210215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 913 PM EDT TUE AUG 20 1991 THE NATIONAL WEATHER SERVICE IN ATLANTIC CITY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1015 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTH NEW JERSEY ...CAPE MAY COUNTY AND FOR THE ADJACENT COASTAL WATERS AT 910 PM EDT WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM OVER THE MOUTH OF THE DELAWARE BAY. THIS THUNDERSTORM HAS A HISTORY OF PRODUCING MARBLE SIZED HAIL OVER GEORGETOWN DELAWARE. MOVEMENT WAS NORTH AT 20 MILES AN HOUR. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVMERS THE ROAD. SCURA
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 20, 6:01 PM EDT, 3 hours 12 minutes before
DEZ002-001-210100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 558 PM EDT TUE AUG 20 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR DELAWARE AND ADJOINING COASTAL WATERS UNTIL 11 PM EDT THIS EVENING... AT 545 PM EDT RADAR SHOWS A CLUSTER OF THUNDERSTORMS WITH HEAVY RAIN DANGEROUS LIGHTNING AND POSSIBLE STRONG GUSTY WINDS MOVING INTO SOUTHWEST KENT COUNTY OF DELAWARE. THESE STROMS WILL MOVE NORTHEAST AT ABOUT 30 MPH ACROSS SOUTH AND CENTRAL KENT COUNTY DURING THE NEXT COUPLE OF HOURS THEN OUT ONTO THE DELAWARE BAY. OTHER STORMS SHOULD BEGIN TO MOVE INTO SUSSEX COUNTY WITHIN THE NEXT HOUR OR TWO...SOME WILL HAVED HEAVY RAIN...DANGEROUS LIGHTNING AND POSSIBLE GUSTY WINDS. SOME ROAD AND STREET FLOODING MAY OCCUR IN HEAVIER RAINFALL SO MOTORIST SHOULD USE CAUTION. BOATERS ON THE DELAWARE BAY SHOULD TAKE ALL EFFORTS TO AVOID THESE STORMS. CKD
Special weather statement, Aug 20, 6:51 PM EDT, 2 hours 22 minutes before
NJZ002>004-202345- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 630 PM EDT TUE AUG 20 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 11 PM EDT FOR ALL OF SOUTHERN NEW JERSEY AND THE ADJACENT COASTAL WATERS... AT 630 PM EDT...THE NATIONAL WEATHER SERVICE RADAR DETECTED AN 80 MILE WIDE BAND OF SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAINS EXTENDING FROM SOUTHERN NEW YORK STATE...NEAR WESTCHESTER..SOUTH THROUGH ALL OF NEW JERSEY...DELAWARE...EASTERN MARYLAND AND EASTERN VIRGINIA. THE HEAVIER THUNDERSTORMS WERE LOCATED OVER WESTERN ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...NEAR HAMMONTON. JUST TO THE SOUTH OF MILLVILLE AND OVER CENTRAL DELAWARE...NEAR DOVER. SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN WERE SCATTERED OVER WESTERN LONG ISLAND AND OVER THE OCEAN SOUTH OF QUEENS AND NASSAU COUNTIES EXTENDING SOUTH FOR 60 MILES OFF THE COAST OF SOUTHERN LONG ISLAND. MORE SHOWERS SOME WITH HEAVY RAIN WERE LOCATED ACROSS SOUTH CENTRAL PENNSYLVANIA DROPPING DOWN INTO MARYLAND...NEAR HAGERSTOWN AND TO THE NORTHWEST OF WASHINGTON DC. 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 OUTLOOK FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS. THE SHOWERS AND THEUNDERSTORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. SCURA
Special weather statement, Aug 20, 7:18 PM EDT, 1 hour 55 minutes before
DEZ003-002-001-210215- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 714 PM EDT TUE AUG 20 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR SUSSEX COUNTY OF DELAWARE UNTIL 11 PM EDT THIS EVENING... THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELED FOR NEW CASTLE AND KENT OF DELAWARE. AT 7 PM EDT RADAR SHOWS THUNDERSTORMS WITH HEAVY RAIN...DANGEROUS LIGHTNING AND POSSIBLE GUSTY WINDS OVER AND JUST WEST OF SUSSEX COUNTY DEALWARE. THESE STORMS ARE MOVING EASTERLY AT ABOUT 30 TO 35 MPH AND AFFECT PORTIONS OF SUSSEX COUNTY FOR THE NEXT COUPLE OF HOURS AND WILL MOVE OVER THE ATLANTIC COASTAL WATERS. OTHER STORMS...SOME WITH HEAVY RAIN DANGEROUS LIGHTNING AND POSSIBLE GUSTY WINDS MAY AFFECT PORTIONS OF KENT AND NEW CASTLE COUNTIES FOR THE REMAINDER OF THE EVENING. PERSONS IN SUSSEX COUNTY SHOULD BE ALERT FOR THESE STORMS AND BE PREPARED TO SEEK A PLACE OF SAFTY. BOATERS ON THE DELAWARE BAY AND THE ATLANTIC COAST OF DELAWARE SHOULD BE ALERT FOR THESE STORMS AND BE PREPARED TO SEEK SAFE HARBOR. ADDITIONAL STATEMENTS WILL BE ISSUED AS REQUIRED BY CHANGING CONDITIONS. CKD
Special weather statement, Aug 20, 7:51 PM EDT, 1 hour 22 minutes before
NJZ002>004-210045- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 730 PM EDT TUE AUG 20 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 11 PM EDT FOR ALL OF SOUTHERN NEW JERSEY AND THE ADJACENT COASTAL WATERS... AT 730 PM EDT...THE NATIONAL WEATHER SERVICE RADAR DETECTED AN 60 MILE WIDE BAND OF SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAINS EXTENDING FROM NORTHERN NEW JERSEY...SOUTH THROUGH EASTERN DELAWARE...EASTERN MARYLAND AND EASTERN VIRGINIA. THE HEAVIER THUNDERSTORMS WERE LOCATED OVER WESTERN ATLANTIC...BURLINGTON AND WESTERN OCEAN COUNTIES OF SOUTHERN NEW JERSEY. ALSO OVER SOUTHERN DELAWARE AND THE EASTERN SHORES OF MARYLAND AND VIRGINIA. SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN WERE SCATTERED OVER WESTERN LONG ISLAND AND OVER THE OCEAN OFF THE COAST OF NEW JERSEY EXTENDING OUT FOR 100 MILES OFF THE COAST. . MORE SHOWERS SOME WITH HEAVY RAIN WERE LOCATED ACROSS SOUTH CENTRAL PENNSYLVANIA...NEAR HARRISBURG DROPPING DOWN INTO MARYLAND...25 MILES WEST OF BALTIMORE. 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 OUTLOOK FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS. THE SHOWERS AND THUNDERSTORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. SCURA
Local storm report, Aug 20, 8:42 PM EDT, 31 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON DE
DATE/TIME EVENT
20/2030EDT TIMEF APPX. MARBLE SIZE HAIL SOUTHWEST OF
GEORGETOWN DELAWARE.
CKD
[Special weather statement, Aug 20, 8:49 PM EDT, 24 minutes before
NJZ002>004-210145- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 830 PM EDT TUE AUG 20 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 11 PM EDT FOR ALL OF SOUTHERN NEW JERSEY AND THE ADJACENT COASTAL WATERS... AT 830 PM EDT...THE NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE THUNDERSTORM OVER LOWER DELAWARE ABOUT TO MOVE INTO THE DELAWARE BAY BETWEEN MILFORD AND LEWES. THIS IS A DANGEROUS STORM AND CONTAINS STRONG WINDS...HAIL...DANGEROUS LIGHTNING AND TORRENTIAL RAINS. THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED OVER ATLANTIC...EASTERN BURLINGTON AND OCEAN COUNTIES OF SOUTHERN NEW JERSEY. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING LOCALIZED FLOODING IN A SHORT AMOUNT OF TIME. SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN WERE SCATTERED OVER WESTERN LONG ISLAND...MANY SECTIONS OF NEW JERSEY...DELAWARE...EASTERN MARYLAND AND EAST CENTRAL PENNSYLVANIA. THE SHOWERS AND THUNDERSTORMS EXTENDED OVER THE OCEAN OFFSHORE OF NEW JERSEY OUT 100 MILES OFF THE COAST. 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 T HE OUTLOOK FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS. THE SHOWERS AND THUNDERSTORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. SCURA
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 9:59 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic | 61 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.