Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 58, NWS Philadelphia/Mount Holly

August 28, 1992Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 28, 1992, 7:11 PM EDT for Delaware County, Pennsylvania. It was in force for 64 min.

The area

The counties it named.

The facts

Issued
Aug 28, 1992, 7:11 PM EDT (23:11 UTC)
Expired
Aug 28, 1992, 8:15 PM EDT
In force
64 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Delaware County, PA

The nearest sounding before it

Atlantic City In, NJ (KACY), launched 12:00Z, 11.2 hours before the alert went out and 93 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 1992-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 382 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 1992-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
382 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
889 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
65 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 282313
SVRPHL
NJC015-033-PAC045-290015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA PA
711 PM EDT FRI AUG 28 1992
 
THE NATIONAL WEATHER SERVICE IN PHILADELPHIA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  815 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH NEW JERSEY
 
   ...GLOUCESTER COUNTY...SALEM COUNTY
 
 
IN SOUTHEAST PENNSYLVANIA
 
   ...DELAWARE COUNTY
 
SEVERE THUNDERSTORMS ARE MOVING ACROSS EASTERN MARYLAND AND
DELAWARE. AT 710 PM...WEATHER SERVICE RADAR SHOWED THESE
SEVERE THUNDERSTORMS MOVING TOWARDS THE NORTHEAST AT AROUND
35 MILES AN HOUR.
 
A TORNADO WATCH CONTINUES FOR SOUTHEASTERN PENNSYLVANIA AND
SOUTHERN NEW JERSEY UNTIL 100 AM EDT.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH
LITTLE OR NO ADVANCED WARNING.
 
SEVERE THUNDERSTORMS PRODUCE WINDS IN EXCESS OF 55 MILES PER HOUR...
LARGE HAIL...AND DEADLY LIGHTNING.  IF THREATENING WEATHER SUDDENLY
APPROACHES YOU...BOATERS SHOULD BE PREPARED TO MOVE TO SAFE HARBOR.
IF CAUGHT OUT ON THE OPEN WATER...STAY BELOW DECK...IF POSSIBLE...AND
AWAY FROM UNGROUNDED METAL OBJECTS.
 
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 28, 6:00 PM EDT, 1 hour 11 minutes before
PAZ007>012-016-NJ002>004-006-290300-

SPECIAL WEATHER STATEMENT...SEVERE THUNDERSTORM WATCH
NATIONAL WEATHER SERVICE PHILADELPHIA PA
545 PM EDT FRI AUG 28 1992

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR A LARGE PART OF EASTERN
PENNSYLVANIA UNTIL 11 PM EDT...

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR MOST OF EASTERN PENNSYLVANIA WITH THE EXCEPTION OF THE NORTHERN
COUNTIES THAT BORDER NEW YORK.

AT 545 PM RADAR SHOWED A LINE OF THUNDERSTORMS FROM NEAR HARRISBURG
SOUTHEAST TO THE NORTHERN CHESAPEAKE BAY AND CONTINUING TO SALISBURY
MARYLAND. THESE STORMS ARE MOVING RAPIDLY TO THE NORTHEAST AT A SPEED
OF 45 MPH AND WILL BE APPROACHING PHILADELPHIA FROM THE SOUTHWEST...
OR IF YOU ARE IN CENTER CITY...KEEP AN EYE OUT FOR STORMS APPROACHING
FROM THE DIRECTION OF THE AIRPORT.

THIS LINE COULD PRODUCE WINDS OF 50 TO 60 MPH AS THEY PASS THROUGH
ACCOMPANIED BY HAIL AND BRIEF TORRENTIAL DOWNPOURS. IN ADDITION...
QUITE A FEW STATIONS IN VIRGINIA AND MARYLAND ARE REPORTING QUITE A
FEW CLOUD TO GROUND LIGHTNING STRIKES WHICH ARE THE ONES THAT KILL.

THE COMBINATION OF THE REMNANTS OF ANDREW AND AN APPROACHING COLD FRONT
IS PRODUCING THE POTENTIALLY SEVERE WEATHER THIS EVENING. THE FIRST LINE
OF THUNDERSTORMS WILL BE APPROACHING PHILADELPHIA AND VICINITY BETWEEN
615 AND 645 PM THEN CONTINUE INTO NORTHEAST PHILADELPHIA.

STAY TUNED FOR ADDITIONAL STATEMENTS AND AND POSSIBLE WARNINGS THAT
MAY BE ISSUED. TSINCE THE STORMS ARE MOVING SO FAST...THERE MAY NOT BE
SUFFICIENT TIME TO WARN FOR ALL STORMS THAT MAY BE SEVERE.

EBERWINE
Special weather statement, Aug 28, 6:09 PM EDT, 1 hour 2 minutes before
DEZ003-002-001-282300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON DE
604 PM EDT FRI AUG 28 1992

...THUNDERSTORMS ABOUT TO ENTER INTO SOUTHEASTERN DELAWARE...
...A TORNADO WATCH REMAINS IN EFFECT UNTIL 9 PM EDT FOR DELAWARE...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 9 PM EDT THIS EVENING FOR THE
STATE OF DELAWARE AND THE ADJACENT COASTAL WATERS.

WEATHER RADAR SHOWED A LINE OF THUNDERSTORMS WERE MOVING ONTO
MARYLANDS EASTERN SHORE AND WILL MOVE INTO SOUTHWESTERN DELAWARE
WITHIN THE NEXT HALF AN HOUR.  THESE STORMS HAVE PRODUCED TORNADOES
FROM BALTIMORE TO PATUXENT RIVER MARYLAND AND ANOTHER WAS ALSO
REPORTED 6 MILES EAST OF CAMBRIDGE MARYLAND.  TREES AND POWER LINES
WERE REPORTED DOWN IN CAMBRIDGE MARYLAND FROM THESE STORMS.  LIGHTNING
DETECTION SYSTEMS WERE ALSO SHOWING NUMEROUS CLOUD TO GROUND LIGHTNING
STRIKES.

PERSONS IN EXTREME SOUTHWEST DELAWARE SHOULD BE ON THE LOOKOUT FOR THE
POSSIBILITY OF STRONG GUSTY WINDS...LARGE HAIL...AND POSSIBLY
TORNADOES.  IF THREATENING WEATHER APPROACHES YOUR AREA...SEEK SAFE
SHELTER IN THE BASEMENT UNDER HEAVY FURNITURE OR IF NO BASEMENT WITHIN
AN INTERIOR CLOSET.

BOATERS ARE URGED TO HEAD FOR PORT TO ALLOW FOR PLENTY OF TIME TO REACSAFE HARBOR.

THE NATIONAL WEATHER SERVICE WILL CONTINUE TO MONITOR THIS DANGEROUS
SITUATION AND WILL ISSUE ANOTHER STATEMENT AT AROUND 700 PM EDT.

LOMBARDY
Special weather statement, Aug 28, 6:12 PM EDT, 59 minutes before
DEZ003-002-001-282300-

SPECIAL WEATHER STATEMENT CORRECTION
NATIONAL WEATHER SERVICE WILMINGTON DE
604 PM EDT FRI AUG 28 1992

...THUNDERSTORMS ABOUT TO ENTER INTO SOUTHWESTERN DELAWARE...
...A TORNADO WATCH REMAINS IN EFFECT UNTIL 9 PM EDT FOR DELAWARE...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 9 PM EDT THIS EVENING FOR THE
STATE OF DELAWARE AND THE ADJACENT COASTAL WATERS.

WEATHER RADAR SHOWED A LINE OF THUNDERSTORMS WERE MOVING ONTO
MARYLANDS EASTERN SHORE AND WILL MOVE INTO SOUTHWESTERN DELAWARE
WITHIN THE NEXT HALF AN HOUR.  THESE STORMS HAVE PRODUCED TORNADOES
FROM BALTIMORE TO PATUXENT RIVER MARYLAND AND ANOTHER WAS ALSO
REPORTED 6 MILES EAST OF CAMBRIDGE MARYLAND.  TREES AND POWER LINES
WERE REPORTED DOWN IN CAMBRIDGE MARYLAND FROM THESE STORMS.  LIGHTNING
DETECTION SYSTEMS WERE ALSO SHOWING NUMEROUS CLOUD TO GROUND LIGHTNING
STRIKES.
PERSONS IN EXTREME SOUTHWEST DELAWARE SHOULD BE ON THE LOOKOUT FOR THE
POSSIBILITY OF STRONG GUSTY WINDS...LARGE HAIL...AND POSSIBLY
TORNADOES.  IF THREATENING WEATHER APPROACHES YOUR AREA...SEEK SAFE
SHELTER IN THE BASEMENT UNDER HEAVY FURNITURE OR IF NO BASEMENT WITHIN
AN INTERIOR CLOSET.

BOATERS ARE URGED TO HEAD FOR PORT TO ALLOW FOR PLENTY OF TIME TO REACH
SAFE HARBOR.

THE NATIONAL WEATHER SERVICE WILL CONTINUE TO MONITOR THIS DANGEROUS
SITUATION AND WILL ISSUE ANOTHER STATEMENT AT AROUND 700 PM EDT.

LOMBARDY
Special weather statement, Aug 28, 6:15 PM EDT, 56 minutes before
DEZ003-002-001-282300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON DE
604 PM EDT FRI AUG 28 1992

...THUNDERSTORMS ABOUT TO ENTER INTO SOUTHEASTERN DELAWARE...
...A TORNADO WATCH REMAINS IN EFFECT UNTIL 9 PM EDT FOR DELAWARE...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 9 PM EDT THIS EVENING FOR THE
STATE OF DELAWARE AND THE ADJACENT COASTAL WATERS.

WEATHER RADAR SHOWED A LINE OF THUNDERSTORMS WERE MOVING ONTO
MARYLANDS EASTERN SHORE AND WILL MOVE INTO SOUTHWESTERN DELAWARE
WITHIN THE NEXT HALF AN HOUR.  THESE STORMS HAVE PRODUCED TORNADOES
FROM BALTIMORE TO PATUXENT RIVER MARYLAND AND ANOTHER WAS ALSO
REPORTED 6 MILES EAST OF CAMBRIDGE MARYLAND.  TREES AND POWER LINES
WERE REPORTED DOWN IN CAMBRIDGE MARYLAND FROM THESE STORMS.  LIGHTNING
DETECTION SYSTEMS WERE ALSO SHOWING NUMEROUS CLOUD TO GROUND LIGHTNING
STRIKES.

PERSONS IN EXTREME SOUTHWEST DELAWARE SHOULD BE ON THE LOOKOUT FOR THE
POSSIBILITY OF STRONG GUSTY WINDS...LARGE HAIL...AND POSSIBLY
TORNADOES.  IF THREATENING WEATHER APPROACHES YOUR AREA...SEEK SAFE
SHELTER IN THE BASEMENT UNDER HEAVY FURNITURE OR IF NO BASEMENT WITHIN
AN INTERIOR CLOSET.

BOATERS ARE URGED TO HEAD FOR PORT TO ALLOW FOR PLENTY OF TIME TO REACSAFE HARBOR.

THE NATIONAL WEATHER SERVICE WILL CONTINUE TO MONITOR THIS DANGEROUS
SITUATION AND WILL ISSUE ANOTHER STATEMENT AT AROUND 700 PM EDT.

LOMBARDY
Special weather statement, Aug 28, 6:44 PM EDT, 27 minutes before
PAZ007>012-016-NJ002>004-006-290300-

SPECIAL WEATHER STATEMENT...SEVERE THUNDERSTORM/TORNADO WATCH
NATIONAL WEATHER SERVICE PHILADELPHIA PA
630 PM EDT FRI AUG 28 1992

...TORNADO WATCH IN EFFECT UNTIL 1 AM EDT SATURDAY FOR SOUTHEAST
PENNSYLVANIA AND SOUTHERN NEW JERSEY...SEVERE THUNDERSTORM WATCH
IN EFFECT FOR THE REMAINDER OF EASTERN PENNSYLVANIA UNTIL 11 PM EDT
EXCEPT FOR THE NORTHERN COUNTIES THAT BORDER NEW YORK...

SO AS NOT TO CONFUSE ANYONE...SEVERAL WATCHES INCLUDING TORNADO AND
SEVERE THUNDERSTORMS...HAVE BEEN ISSUED FOR PENNSYLVANIA...NEW JERSEY
...DELAWARE...MARYLAND AND OTHER STATES FARTHER SOUTH.

FOR FURTHER DETAILS WE SUGGEST THAT YOU CONSULT YOUR NEAREST NATIONAL
WEATHER SERVICE OFFICE FOR ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS.

AT 630 PM RADAR SHOWED A LINE OF THUNDERSTORMS APPROACHING SOUTHEAST
PENNSYLVANIA AND DELAWARE. THE STORMS HAVE CAUSED SERIOUS STREET
FLOODING IN YORK COUNTY PENNSYLVANIA.

IN ADDITION...OUR NEIGHBORING NATIONAL WEATHER SERVICE OFFICE IN
WASHINGTON D.C. REPORTED SEVERAL TORNADO SIGHTINGS IN AND AROUND
BALTIMORE MARYLAND...AND DAMAGE IN HOWARD AND SOUTHERN CARROL
COUNTIES. THESE COUNTIES ARE CLOSE TO THE SOUTHERN PENNSYLVANIA
BORDER.

THUNDERSTORMS WILL BE MOVING INTO PHILADELPHIA AND VICINITY FROM
THE SOUTHWEST AND ARE CAPABLE OF PRODUCING WIND GUSTS OF 70 MPH
AS THEY PASS THROUGH. WHAT CAUSES TREE LIMBS TO SNAP AND SOME TREES
TO FALL IS THE SUDDEN INCREASE IN SPEED AND THE QUICK CHANGE IN
DIRECTION OF THE WIND.

BE ON THE LOOKOUT FOR STORMS APPROACHING FROM THE SOUTHWEST AND
BE PREPARED TO SEEK SHELTER IF THE SKY SUDDENLY TURNS OMINOUS.

STAY TUNED FOR ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS.

EBERWINE
Special weather statement, Aug 28, 7:08 PM EDT, 3 minutes before
PAZ011-016- 290100 -

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ALLENTOWN PA
707 PM EDT FRI AUG 28 1992

 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR THE LEHIGH VALLEY AND
    THE POCONOS UNTIL 11 PM EDT...

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR EASTERN PENNSYLVANIA THIS FRIDAY AFTERNOON AND EVENING UNTIL
11 PM EDT. THE WATCH INCLUDES LEHIGH...NORTHAMPTON...BERKS...CARBON
...SCHUYLKILL...MONROE AND PIKE COUNTIES.

AT 700 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED A LARGE AREA
OF SHOWERS AND EMBEDDED THUNDERSTORMS OVER EASTERN PENNSYLVANIA THAT
EXTENDS AS FAR EAST AS HAZELTON SOUTH TO READING.  THE SHOWERS AND
THUNDERSTORMS ARE MOVING OVER SCHUYLKILL AND BERKS COUNTIES AND WILL
ENTER CARBON AND LEHIGH COUNTIES WITHIN THE HOUR. HEAVY RAIN AND
STRONG GUSTY WINDS NEAR 50 MPH ARE POSSIBLE WITH THESE THUNDERSTORMS.
REMEMBER THAT A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS
ARE FAVORABLE FOR SEVERE THUNDERSTORMS TO DEVELOP. IF THREATENING
WEATHER IS SIGHTED...GET TO A PLACE OF SAFETY IMMEDIATELY.

STAY TUNED TO NOAA WEATHER RADIO OR YOUR LOCAL RADIO AND TELEVISION
STATIONS FOR ANY ADDITIONAL INFORMATION ON THESE THUNDERSTORMS.

FUNK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 6:56 PM EDTSevere Thunderstorm WarningPHIChester49 min
Aug 28, 7:47 PM EDTSevere Thunderstorm WarningPHIMontgomery48 min
Aug 28, 7:57 PM EDTSevere Thunderstorm WarningPHIPhiladelphia38 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1992Every severe thunderstorm warning in 1992

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.