Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1988

Severe Thunderstorm Warning 35, NWS Philadelphia/Mount Holly

July 26, 1988Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 26, 1988, 7:44 PM EDT for Montgomery County, Philadelphia County, Pennsylvania. It was in force for 31 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
Jul 26, 1988, 7:44 PM EDT (23:44 UTC)
Expired
Jul 26, 1988, 8:15 PM EDT
In force
31 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

Counties Montgomery County, PA, Philadelphia County, PA

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
Jul 26, 8:00 PM EDTThunderstorm Wind 57Philadelphia, PA

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, 11.7 hours before the alert went out and 97 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 1988-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 604 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 1988-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 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
604 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
1036 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPHL 262344
SVRPHL
PAC101-091-270015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE PHILADELPHIA PA
744 PM EDT TUE JUL 26 1988

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 815 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE SOUTHEAST PART OF PENNSYLVANIA
      PHILADELPHIA...SOUTHERN MONTGOMERY

AT 744 PM EDT RADAR INDICATED AN AREA OF SEVERE THUNDERSTORMS
OVER DELAWARE COUNTY MOVING TOWARD SOUTHERN MONTGOMERY AND
PHILADELPHIA COUNTIES AT ABOUT 25 MILES AN HOUR.

 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 SOUTHEASTERN
 PENNSYLVANIA TIL 11 PM EDT.

 HEAVY RAINS WITH THIS THUNDERSTORM MAY CAUSE FLOODING
 OF SMALL STREAMS AND UNDERPASSES.

 KWH

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 26, 6:26 PM EDT, 1 hour 18 minutes before
ABPA-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ALLENTOWN PA
620 PM EDT TUE JULY 26 1988

...HEAVY THUNDERSTORMS IN BERKS COUNTY...

AT 620 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED HEAVY
THUNDERSTORMS IN WESTERN BERKS COUNTY. THE STORMS ARE MOVING EAST
NORTHEAST AT 25 MPH AND WILL MOVE ACROSS BERKS COUNTY IN THE NEXT HOUR.
A LINE OF HEAVY THUNDERSTORMS EXTENDED FROM COLUMBIA SOUTHWESTWARD TO
NORTHUMBERLAND COUNTY. THIS LINE WILL MOVE EASTNORTHEASTWARD INTO
WESTERN AND NORTHERN SCHUYLKILL COUNTY IN ABOUT ONE HOUR. THESE STORMS
CONTAIN HEAVY DOWNPOURS...DANGEROUS LIGHTNING AND COULD CONTAIN STRONG...
GUSTY WINDS AND SMALL HAIL.

ELSWHERE...SHOWERS AND THUNDERSTORMS WERE SC2ATTERED THROUGHOUT LEHIGH
AND NORTHAMPTON COUNTIES.

PEOPLE LIVING IN BERKS AND SCHUYLKILL COUNTIES SHOULD SEEK SHELTER IF
THREATENING WEATHER IS SIGHTED.

$$DOVICO
Special weather statement, Jul 26, 6:40 PM EDT, 1 hour 4 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHILADELPHIA, PA
640 PM EDT TUE JUL 26 1988

...SEVERE THUNDERSTORM WATCH UNTIL 11 PM EDT FOR PHILADELPHIA
METROPOLITAN AREA...

...STRONG THUNDERSTORMS IN CHESTER COUNTY...

AT 640 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF
THUNDERSTORMS WITH VERY HEAVY RAIN OVER CHESTER COUNTY. IN ADDITION
...THERE WERE SOME THUNDERSTORMS WITH HEAVY RAIN IN NORTHERN BUCKS
AND NORTHERN MONTGOMERY COUNTIES AND ANOTHER AREA IN SALEM COUNTY.
THESE STORMS CONTAIN VERY HEAVY DOWNPOURS WITH POSSIBLE LOCALIZED
FLOODING AND STRONG GUSTY WINDS.

THE STORMS ARE MOVING NORTHEAST AT ABOUT 25 MILES AN HOUR AND
WILL AFFECT DELAWARE COUNTY AND PHILADELPHIA C@OUNTIES BETWEEN 640
AND 740 PM EDT.  IF YOU SEE THREATENING WEATHER APPROACH...SEEK
SHELTER IMMEDIATELY.

KWH
Special weather statement, Jul 26, 6:44 PM EDT, 1 hour before
^PHLSPSACY
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE ATLANTIC CITY NJ
635 PM EDT TUE JUL 26 1988

 ...SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PORTIONS OF WESTERN
NEW JERSEY INCLUDING CUMBERLAND AND BURLINGTON COUNTIES UNTIL 11 PM...

AT 630 PM..THUNDERSTORMS WHICH ARE PRODUCING HEAVY RAIN AND HAVE THE
POTENTIAL FOR STRONG GUSTY WINDS AND HAIL ARE BEING OBSERVED IN THE FOLLOWING
EASTERN PENNSYLVANIA LOCATIONS:  A FEW MILES NORTHEAST OF READING...JUST
SOUTH OF POTTSTOWN AND 10 MILES WEST OF WILMINGTON AND 10 MILES EAST OF
LANCASTER.

A STRONG THUNDERSTORM HAS ALSO DEVELOPED DURING THE PAST HOUR A FEW MILES
WEST OF MILLVILLE NEW JERSEY.

TO COMPLETE THE PICTURE..D.SHOWERS AND LIGHTER THUNDERSTORMS WERE OCCURING IN
NORTHEASTERN MARYLAND...EASTERN HALF OF PENNSYLVANIA...NORTHERN NEW JERSEY
AND SOUTHEASTERN NEW YORK.  THE THUNDERSTORMS WERE MOVING TOWARD THE NORTHEAST
AT AROUND 25 MILES AN HOUR.
Special weather statement, Jul 26, 6:44 PM EDT, 1 hour before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON DE
645 PM EDT TUE JUL 26 1988

...SEVERE THUNDERSTORM WATCH CONTINUES STATEWIDE UNTIL 11PM...

THUNDERSTORMS AT PRESENT EXTEND FROM SOUTHEASTERN PENNSYLVANIA...
NORTHEASTERN THROUGH CENTRAL MARYLAND INTO CENTRAL VIRGINIA.
MOVEMENT WAS TOWARD THE NORTHEAST AT 30 MPH.

GOLFBALL SIZED HAIL AND WINDS IN EXCESS OF 55 MPH HAVE BEEN
REPORTED IN STORMS OVER NORTHERN VIRGINIA.  STORMS ALONG THE
NORTHERN DELAWARE AND MARYLAND BORDER CONTAINED HEAVY RAIN AND
FREQUENT DANGEROUS LIGHTNING.  RAIN HAS SPREAD INTO NORTHERN AND
WESTERN PORTIONS OF NEW CASTLE COUNTY WITH HEAVIEST RAIN JUST TO
THE NORTH AND WEST OF NEWARK.

MOVE INDOORS TO A REINFORCED STRUCTURE IF A STORM APPROACHES.  ALSO
BE ALERT FOR THE POSSIBILITY THAT HEAVY RAIN WILL CAUSE FLOODING OF
ROADSIDES AND AREAS OF POOR DRAINAGE.
.
AT PRESENT...NO STORMS WERE THREATENING KENT OR SUSSEX COUNTIES.
HOWEVER...ANY STORMS THAT DgEVELOP THERE DURING THE NEXT FEW HOURS
HAVE THE POTENTIAL TO BECOME SEVERE.

HITCHENS
Special weather statement, Jul 26, 7:41 PM EDT, 3 minutes before
^PHLSPSACY
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE ATLANTIC CITY NJ
735 PM EDT TUE JUL 26 1988

 ...SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PORTIONS OF WESTERN
NEW JERSEY INCLUDING CUMBERLAND AND BURLINGTON COUNTIES UNTIL 11 PM...

AT 730 PM..THUNDERSTORMS WHICH ARE PRODUCING HEAVY RAIN AND HAVE THE
POTENTIAL FOR STRONG GUSTY WINDS AND HAIL ARE OCCURING BETWEEN NEW
BRUNSWICK NEW JERSEY AND WILMINGTON DELAWARE.

ELSWHERE NUMEROUS SHOWERS AND LIGHTER THUNDERSTORMS WERE BEING OBSERVED IN
NORTHEASTERN MARYLAND...NORTHERN DELAWARE...EASTERN HALF OF PENNSYLVANIA
...SOUTHEASTERN NEW YORK...NORTHERN AND SOUTHWESTERN NEW JERSEY.

THE THUNDERSTORMS ARE MOVING TOWARD THpE NORTHEAST AT AROUND 25 MILES AN HOUR.
JIK
Special weather statement, Jul 26, 7:44 PM EDT, 0 minutes before
ABPA-
SPECIAL WEATHER STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE ALLENTOWN PA
620 PM EDT TUE JULY 26 1988

...SEVERE THUNDERSTORM WATCH UNTIL 11 PM EDT FOR EAST CENTRAL PENNSYLVANIA...
...HEAVY THUNDERSTORMS IN BERKS COUNTY...

AT 620 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED HEAVY
THUNDERSTORMS IN WESTERN BERKS COUNTY. THE STORMS ARE MOVING EAST
NORTHEAST AT 25 MPH AND WILL MOVE ACROSS BERKS COUNTY IN THE NEXT HOUR.
A LINE OF HEAVY THUNDERSTORMS EXTENDED FROM COLUMBIA SOUTHWESTWARD TO
NORTHUMBERLAND COUNTY. THIS LINE WILL MOVE EASTNORTHEASTWARD INTO
WESTERN AND NORTHERN SCHUYLKILL COUNTY IN ABOUT ONE HOUR. THESE STORMS
CONTAIN HEAVY DOWNPOURS...DANGEROUS LIGHTNING AND COULsD CONTAIN STRONG...
GUSTY WINDS AND SMALL HAIL.

ELSWHERE...SHOWERS AND THUNDERSTORMS WERE SCATTERED THROUGHOUT LEHIGH
AND NORTHAMPTON COUNTIES.
THREATENING WEATHER IS SIGHTED.

$$DOVICO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 26, 7:15 PM EDTSevere Thunderstorm WarningPHIChester, Delaware60 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1988Every severe thunderstorm warning in 1988

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.