Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1993
Severe Thunderstorm Warning 34, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 3, 1993, 7:51 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 69 min.
The area
The counties it named.
The facts
- Issued
- Sep 3, 1993, 7:51 PM EDT (23:51 UTC)
- Expired
- Sep 3, 1993, 9:00 PM EDT
- In force
- 69 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Bucks County, PA, Montgomery County, PA
The nearest sounding before it
Atlantic City In, NJ (KACY), launched 12:00Z, 11.9 hours before the alert went out and 111 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
- 1865 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 949 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 144 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 032357 SVRPHL PAC017-091-040100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA PA 751 PM EDT FRI SEP 3 1993 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEAST PENNSYLVANIA ...BUCKS COUNTY...MONTGOMERY AT 745 PM EDT RADAR SHOWED A LINE OF THUNDERSTORMS FROM BERKS COUNTY SOUTH TO THE MARYLAND BORDER. SEVERAL THUNDERSTORMS IN THIS LINE COULD EASILY CAUSE DAMAGING WINDS...HAIL...FREQUENT CLOUD TO GROUND LIGHTNING AND BRIEF TORRENTIAL DOWNPOURS. THE LINE OF THUNDERSTORMS WILL MOVE INTO THE WESTERN PARTS OF MONTGOMERY AND BUCKS COUNTIES WITHIN THE NEXT 15 MINUTES AND MOVE THROUGH POTTSTOWN THEN EAST TO GREEN LANE...AND IN BUCKS COUNTY SELLERSVILLE AND PERKASIE. THE THUNDERSTORM WERE MOVING EAST NORTHEAST 35 TO 40 MPH. THESE ARE DANGEROUS STORMS. 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. EBERWINE/YOUNG/WANTON
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, Sep 3, 6:37 PM EDT, 1 hour 14 minutes before
PAZ011-016- 030000 - SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OFFICE ALLENTOWN PA 630 PM EDT FRI SEP 3 1993 ...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL PENNSYLVANIA AND THE POCONOS UNTIL 10 PM TONIGHT... A SEVERE THUNDERSTORM WATCH FOR ALL OF EAST CENTRAL PENNSYLVANIA AND THE POCONOS REMAINS IN EFFECT UNTIL 10PM TONIGHT. AT 625PM NATIONAL WEATHER SERVICE RADAR WAS SHOWING AN AREA OF SHOWERS AND THUNDERSTORMS EXTENDING FROM SCRANTON SOUTHWESTWARD THROUGH THE SUSQUEHANNA VALLEY TO HAGERSTOWN MARYLAND AND CONTINUING THROUGH NORTWESTERN WEST VIRGINIA. SMALLER AREAS OF SHOWERS AND THUNDERSTORMS WERE FOUND OVER CARBON AND MONROE COUNTIES AND FROM LANCASTER TO BUCKS COUNTY NEAR NEW HOPE. THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST NORTHEAST AT 35 TO 40 MPH. THE STRONGEST THUNDERSTORMS WERE LOCATED IN A LINE FROM HAZLETON TO LANCASTER PENNSYLVANIA. SHOWERS AND THUNDERSTORMS WILL CONTINUE FOR THE NEXT SEVERAL HOURS IN AND AROUND EAST CENTRAL PENNSYLVANIA AND THE POCONOS...WITH SOME STRONG THUNDERSTORMS MOVING BETWEEN READING AND PHILADELPHIA OVER THE NEXT FEW HOURS. REMEMBER A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS ANYWHERE WITHIN OR NEAR THE WATCH AREA. IF THREATENING WEATHER APPROACHES SEEK SHELTER IMMEDIATELY. STAY TUNED TO NOAA WEATHER RADIO OR LOCAL T.V. RADIO NEWS STATIONS FOR ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS. MILLER/WSO ALLENTOWN
Special weather statement, Sep 3, 6:42 PM EDT, 1 hour 9 minutes before
NJZ003-004-006-032200 SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 630 PM EDT FRI SEP 3 1993 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 10 PM EDT FOR CUMBERLAND AND BURLINGTON COUNTIES OF SOUTHERN NEW JERSEY... AT 630 PM...ATLANTIC CITY RADAR WAS DETECTING THUNDERSTORMS WITH VERY HEAVY RAIN OVER LANCASTER COUNTY SOUTHEAST PENNSYLVANIA AND NORTHAMPTON COUNTY OF EAST CENTRAL PENNSYLVANIA ANOTHER WAS OVER HARRISBURG. THEY WERE MOVING EAST NORTHEAST AT 30 MILES AN HOUR. OTHER THUNDERSTORMS WERE OVER NORTHWEST PENNSYLVANIA AND NORTHEAST MARYLAND. THE THUNDERSTORMS COULD PRODUCE STRONG GUSTY WINDS...HAIL AND BRIEF HEAVY DOWNPOURS AND FREQUENT LIGHT ENING. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER INDOORS IMMEDIATELY. BC
Special weather statement, Sep 3, 6:52 PM EDT, 59 minutes before
PAZ011-016- 030000 - SPECIAL WEATHER STATEMENT...CORRECTED. NATIONAL WEATHER SERVICE OFFICE ALLENTOWN PA 630 PM EDT FRI SEP 3 1993 ...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL PENNSYLVANIA AND THE POCONOS UNTIL 10 PM TONIGHT... A SEVERE THUNDERSTORM WATCH FOR ALL OF EAST CENTRAL PENNSYLVANIA AND THE POCONOS REMAINS IN EFFECT UNTIL 10PM TONIGHT. AT 625PM NATIONAL WEATHER SERVICE RADAR WAS SHOWING AN AREA OF SHOWERS AND THUNDERSTORMS EXTENDING FROM SCRANTON SOUTHWESTWARD THROUGH THE SUSQUEHANNA VALLEY TO HAGERSTOWN MARYLAND AND CONTINUING THROUGH NORTWESTERN WEST VIRGINIA. SMALLER AREAS OF SHOWERS AND THUNDERSTORMS WERE FOUND OVER CARBON AND MONROE COUNTIES AND FROM LANCASTER TO BUCKS COUNTY NEAR NEW HOPE. THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST NORTHEAST AT 35 TO 40 MPH. THE STRONGEST THUNDERSTORMS WERE LOCATED IN A LINE FROM HAZLETON TO LANCASTER PENNSYLVANIA. SHOWERS AND THUNDERSTORMS WILL CONTINUE FOR THE NEXT SEVERAL HOURS IN AND AROUND EAST CENTRAL PENNSYLVANIA AND THE POCONOS...WITH SOME STRONG THUNDERSTORMS MOVING BETWEEN READING AND PHILADELPHIA OVER THE NEXT FEW HOURS. REMEMBER A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS ANYWHERE WITHIN OR NEAR THE WATCH AREA. IF THREATENING WEATHER APPROACHES SEEK SHELTER IMMEDIATELY. STAY TUNED TO NOAA WEATHER RADIO OR LOCAL T.V. AND RADIO NEWS STATIONS FOR ADDITIONAL STATEMENTS AND POSSIBLE WA2RNINGS. MILLER/WSO ALLENTOWN
Special weather statement, Sep 3, 7:30 PM EDT, 21 minutes before
NJZ003-004-006-032200 SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 730 PM EDT FRI SEP 3 1993 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 10 PM EDT FOR CUMBERLAND AND BURLINGTON COUNTIES OF SOUTHERN NEW JERSEY... AT 630 PM...ATLANTIC CITY RADAR WAS DETECTING THUNDERSTORMS WITH VERY HEAVY RAIN OVER LANCASTER COUNTY SOUTHEAST PENNSYLVANIA AND NORTHAMPTON COUNTY OF EAST CENTRAL PENNSYLVANIA ANOTHER WAS OVER HARRISBURG. THEY WERE MOVING EAST NORTHEAST AT 30 MILES AN HOUR. OTHER THUNDERSTORMS WERE OVER NORTHWEST PENNSYLVANIA AND NORTHEAST MARYLAND. THE THUNDERSTORMS COULD PRODUCE STRONG GUSTY WINDS...HAIL AND BRIEF HEAVY DOWNPOURS AND FREQUENT LIGHTENING. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER INDOORS IMMEDIATELY. /8<" `z)&'66WWUS \\!`WWUS ?f6WWUS 7q4WSUS.V 86WWUS 0XWSUS6 6A`WWUS Aw` WUUSN :V6WWUS $ M*`WWUS <0q`WWUSd D3U^WSUS &WWUSX: ,0v6WWUS :F6WWUS &WWCNB $ .[ WUUS 8L6WWUS*
Special weather statement, Sep 3, 7:41 PM EDT, 10 minutes before
DEZ003-040145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 741 PM EDT FRI SEP 3 1993 ...SEVERE THUNDERSTORM WATCH CONTINUES FOR NEW CASTLE COUNTY... AT 730 PM NATIONAL WEATHER SERVICE RADAR SHOWED SCATTERED THUNDERSTORMS FROM CHESTER COUNTY PENNSYLVANIA THROUGH CENTRAL MARYLAND TO NORTHERN VIRGINIA. THESE STORMS WERE ON THE LEADING EDGE OF A LARGE AREA OF MOSTLY LIGHT RAIN AND WERE MOVING NORTHEAST AT ABOUT 30 MPH. THE THUNDERSTORM IN CHESTER COUNTY IS JUST TO THE WEST OF THE DELAWARE LINE AND IS LIKELY TO CROSS EXTREME NORTHERN NEW CASTLE COUNTY WITHIN THE NEXT 30 MINUTES. THESE STORMS HAVE A HISTORY OF STRONG GUSTY WINDS. HEAVY DOWNPOURS...FREQUENT LIGHTNING AND POSSIBLE HAIL. PERSONS IN THE VICINITY OF THE APPROACHING STORMS SHOULD FIND SAFE SHELTER UNTIL THE STORMS PASS OR DISSIPATE. MOTORIST SHOULD USE CAUTION IF CAUGHT IN A HEAVY DOWNPOUR. STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER UPDATES ON THIS SITUATION. LYLES
Special weather statement, Sep 3, 7:42 PM EDT, 9 minutes before
DEZ003-040145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 741 PM EDT FRI SEP 3 1993 ...SEVERE THUNDERSTORM WATCH CONTINUES FOR NEW CASTLE COUNTY... AT 730 PM NATIONAL WEATHER SERVICE RADAR SHOWED SCATTERED THUNDERSTORMS FROM CHESTER COUNTY PENNSYLVANIA THROUGH CENTRAL MARYLAND TO NORTHERN VIRGINIA. THESE STORMS WERE ON THE LEADING EDGE OF A LARGE AREA OF MOSTLY LIGHT RAIN AND WERE MOVING NORTHEAST AT ABOUT 30 MPH. THE THUNDERSTORM IN CHESTER COUNTY IS JUST TO THE WEST OF THE DELAWARE LINE AND IS LIKELY TO CROSS EXTREME NORTHERN NEW CASTLE COUNTY WITHIN THE NEXT 30 MINUTES. THESE STORMS HAVE A HISTORY OF STRONG GUSTY WINDS. HEAVY DOWNPOURS...FREQUENT LIGHTNING AND POSSIBLE HAIL. PERSONS IN THE VICINITY OF THE APPROACHING STORMS SHOULD FIND SAFE SHELTER UNTIL THE STORMS PASS OR DISSIPATE. MOTORIST SHOULD USE CAUTION IF CAUGHT IN A HEAVY DOWNPOUR. STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER UPDATES pON THIS SITUATION. LYLES
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 7:24 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 66 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1993Every severe thunderstorm warning in 1993
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.