Alert archive / New Jersey / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 51, NWS Philadelphia/Mount Holly

November 20, 1989Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 20, 1989, 8:55 PM EST for Mercer County, New Jersey. It was in force for 65 min. 2 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
Nov 20, 1989, 8:55 PM EST (01:55 UTC)
Expired
Nov 20, 1989, 10:00 PM EST
In force
65 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Mercer 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

TimeReportWhereRemark
Nov 20, 9:15 PM ESTThunderstorm Wind 0Mercer, NJ
Nov 20, 9:31 PM ESTThunderstorm Wind 61Mercer, 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, 1.9 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 1989-11-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1989-11-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1712 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
197 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 210158 RRA
SVRPHL
NJC021-PAC045-101-210300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA PA
855 PM EST MON NOV 20 1989
 
THE NATIONAL WEATHER SERVICE IN PHILADELPHIA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1000 PM EST
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN WEST CENTRAL NEW JERSEY
          ...MERCER
IN SOUTHEAST PENNSYLVANIA
          ...DELAWARE...PHILADELPHIA
 
THUNDERSTORMS WITH WIND GUSTS UP TO 75 MPH WERE REPORTED WITH A LINE
OF THUNDERSTORMS AS THEY MOVED THROUGH THE LEHIGH AND LOWER
SUSQUEHANNA VALLEYS. IN POTTSTOWN PENNSYLVANIA...A NATIONAL WEATHER
SERVICE SPOTTER REPORTED WINDS OF 60 TO 65 MPH. THE THUNDERSTORMS WERE
MOVING SOUTHEAST AT 50 MPH AND WILL MOVE INTO THE WARNED COUNTIES BY
905 PM.
 
 
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.
 
A SEVERE THUNDERSTORM WATCH CONTINUES FOR SOUTHEASTERN
PENNSYLVANIA AND SOUTHERN NEW JERSEY UNTIL 2 AM EDT.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH
LITTLE OR NO ADVANCED WARNING.

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, Nov 20, 7:37 PM EST, 1 hour 18 minutes before
ABPA-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ALLENTOWN PA
730 PM EST SAT NOV 18 1989

...THUNDERSTORMS WITH VERY STRONG WINDS HEADING FOR LEHIGH VALLEY...

AT 730 PM RADAR INDICATED A LINE OF THUNDERSTORMS EXTENDING FROM JUST
EAST OF WILLIAMSPORT SOUTHWEST TO EAST OF ALTOONA. THIS LINE IS MOVING
VERY RAPIDLY TOWARD THE SOUTHEAST AT AROUND 50 MPH. THESE THUNDERSTORMS
CONTAIN VERY STRONG WINDS. STATE COLLGE REPORTED GUSTS TO 71 MPH AT
7PM THIS EVENING WHILE WILLIAMSPORT HAD WINDS TO 63 MPH AT JUST AFTER
700PM.
AT THE PRESENT RATE OF MOVEMENT THESE STORMS SHOULD ENTER THE LEHIGH VALLEY
AROUND 9PM THIS EVENING. RESIDENTS SHOULD TAKE PRECAUTIONS FOR VERY STRONG
WINDS AND SECURE ANY LOOSE OBJECTS AROUND THEIR PROPERTY. MUCH COLDER
AIR WILL MOVE INTO OUR AREA AFTER THE FRONTAL PASSAGE.

$$LOEPER
Special weather statement, Nov 20, 8:11 PM EST, 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON DE
810 PM EST MON NOV 21 1989

...FAST MOVING COLD FRONT WITH STRONG GUSTY WINDS MOVING TOWARD
DELAWARE...

A FAST MOVING COLD FRONT IN WESTERN PENNSYLVANIA WILL PASS THROUGH
NORTHERN DELAWARE SHORTLY AFTER MIDNIGHT.
A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR PARTS OF SOUTHEAST
PENNSYLVANIA AND INCLUDES ALL COUNTIES BORDERING NORTHERN DELAWARE
...BUT DOES NOT INCLUDE ANY PORTION OF DELAWARE.

AS THE COLD APPROACHES THIS EVENING WIND WILL GRADUALLY TURN TO A
MORE WESTERLY DIRECTION AND INCREASE TO ABOUT 20 TO 30 MPH WITH HIGHER
GUST BY THE LATE EVENING HOURS. WITH COLD FRONTAL PASSAGE WINDS WILL
SHIFT TO NORTHWEST AT ABOUT 25 TO 35 MPH WITH SOME GUST IN EXCESS OF
50 MPH. THE WINDS WILL REMAIN STRONG AND GUSTY OVERNIGHT AND BEGIN TO
DIMINISH SLOWLY ON TUESDAY.

 SCATTERED THUNDERSTORMS ARE POSSIBLE WITH THE FRONT IN NORTHERN DELAWARE
AND IF A THUNDERSTORM DOES OCCURDANGEROUS LIGHTNING AND DAMAGING WINDS
ARE POSSIBLE.

WINDS JUST BEFORE AND FOLLOWING THE FRONT WILL BE STRONG AND GUSTY
STATEWIDE...BUT THE STORNGEST WINDS WILL BE IN THE NORTH PART OF THE
FIRST STATE.

BE AWARE OF THE SITUATION AND  BE PREPARED TO SEEK SAFE SHELTER.

BOATERS ON WATERS ADJOINING DELAWARE SHOULD PUT INTO HARBOR UNTIL THE
THREAT OF THESE STRONG WINDS SUBSIDE LATER TUESDAY.

ADDTIONAL STATEMENTS WILL BE ISSUED AS REQUIRED BY CONDITIONS.
CKD
Special weather statement, Nov 20, 8:13 PM EST, 42 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHILADELPHIA, PA
813 PM EST MON NOV 20 1989

...SEVERE THUNDERSTORM WATCH FOR THE PHILADELPHIA METROPOLITAN AREA
   UNTIL 2 AM EST...

AT 800 PM...A LINE OF THUNDERSTORMS EXTENDED FROM THE POCONOS TO THE
LOWER SUSQUEHANNA VALLEY IN PENNSYLVANIA. THESE THUNDERSTORMS
CONTAINED WIND GUSTS UP TO 85 MPH AS THEY MOVED THROUGH CENTRAL
PENNSYLVANIA. THE THUNDERSTORMS WILL APPROACH THE WESTERN SUBURBS
OF PHILADELPHIA AROUND 815 PM AND SHOULD CROSS SOUTHERN NEW JERSEY
BY MIDNIGHT.

THE WINDS WITH THE THUNDERSTORMS COULD BE STRONG ENOUGH TO BRING
DOWN TREE LIMBS AND PRODUCE POWER OUTAGES.  ANY LOOSE OBJECTS
LEFT OUTDOORS SHOULD BE SECURED OR BROUGHT I7NDOORS.

RNS
Special weather statement, Nov 20, 8:50 PM EST, 5 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE ATLANTIC CITY NJ
845 PM EST MON NOV 20 1989

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SOUTHERN NEW JERSEY
   UNTILL 2 AM EST...

A COLD FRONT MOVING RAPIDLY ACROSS PENNSYLVANIA HAS GENERATED A LINE OF
STRONG THUNDERSTORMS. THESE THUNDERSTORMS HAVE CAUSED WINDS UP TO 70 TO
85 MPH AT SEVERAL PLACES...HARRISBURG AND STATE COLLEGE.

THE FRONT WITH THE THUNDERSTORMS WILL MOVE SOUTHEAST AT 45 TO 50 MILES
AN HOUR AND WILL PASS ACROSS SOUTHERN NEW JERSEY BY 1 AM.
RADAR...AT 825 PM...INDICATED AN AREA OF SHOWERS OVER EASTERN PENNSYLVANIA
...FROM PIKE COUNTY SOUTHWEST INTO THE HARRISBURG AREA.
MOVEMENT WAS TO THE SOUTHEAST AT 50 MILES AN HOUR.

PERSONS SHOULD TAKE COVER AND LISTEN TO NOAA RAIDO FOR FURTHER STATEMENTS
AND OR WARNINGS.
GAGER
Special weather statement, Nov 20, 8:52 PM EST, 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON DE
853 PM EST MON NOV 21 1989

...HIGH WIND WARNING FOR DELAWARE TONIGHT...

...FAST MOVING COLD FRONT WITH STRONG GUSTY WINDS MOVING TOWARD
DELAWARE...

A FAST MOVING COLD FRONT IN WESTERN PENNSYLVANIA WILL PASS THROUGH
NORTHERN DELAWARE SHORTLY AFTER MIDNIGHT.
A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR PARTS OF SOUTHEAST
PENNSYLVANIA AND INCLUDES ALL COUNTIES BORDERING NORTHERN DELAWARE
...BUT DOES NOT INCLUDE ANY PORTION OF DELAWARE.

AS THE COLD APPROACHES THIS EVENING WIND WILL GRADUALLY TURN TO A
MORE WESTERLY DIRECTION AND INCREASE TO ABOUT 20 TO 30 MPH WITH HIGHER
GUST BY THE LATE EVENING HOURS. WITH COLD FRONTAL PASSAGE WINDS WILL
SHIFT TO NORTHWEST AT ABOUT 25 TO 35 MPH WITH SOME GUST IN EXCESS OF
50 MPH. THE WINDS WILL REMAIN STRONG AND GUSTY OVERNIGHT AND BEGIN TO
 SCATTERED THUNDERSTORMS ARE POSSIBLE WITH THE FRONT IN NORTHERN DELAWARE
AND IF A THUNDERSTORM DOES OCCUR DANGEROUS LIGHTNING AND DAMAGING WINDS
ARE POSSIBLE.

WINDS JUST BEFORE AND FOLLOWING THE FRONT WILL BE STRONG AND GUSTY
STATEWIDE...BUT THE STORNGEST WINDS WILL BE IN THE NORTH PART OF THE
FIRST STATE.

BE AWARE OF THE SITUATION AND  BE PREPARED TO SEEK SAFE SHELTER.

BOATERS ON WATERS ADJOINING DELAWARE SHOULD PUT INTO HARBOR UNTIL THE
THREAT OF THESE STRONG WINDS SUBSIDE LATER TUESDAY.

ADDTIONAL STATEMENTS WILL BE ISSUED AS REQUIRED BY CONDITIONS.
CKD

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 20, 9:15 PM ESTSevere Thunderstorm WarningPHIBurlington, Camden60 min
Nov 20, 9:15 PM ESTSevere Thunderstorm WarningPHIGloucester, Salem60 min
Nov 20, 9:28 PM ESTSevere Thunderstorm WarningPHIOcean2 hr
Nov 20, 9:28 PM ESTSevere Thunderstorm WarningPHIAtlantic, Cumberland77 min
Nov 20, 9:56 PM ESTSevere Thunderstorm WarningPHICape May2 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 1989Every severe thunderstorm warning in 1989

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.