Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 14, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 16, 1991, 3:57 PM EDT for Bucks County, Pennsylvania. It was in force for 33 min.
The area
The counties it named.
The facts
- Issued
- Jun 16, 1991, 3:57 PM EDT (19:57 UTC)
- Expired
- Jun 16, 1991, 4:30 PM EDT
- In force
- 33 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Bucks County, PA
The nearest sounding before it
Atlantic City In, NJ (KACY), launched 12:00Z, 8.0 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
- 529 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1442 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 161957 SVRPHL PAC017-162030- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA PA 357 PM EDT SUN JUN 16 1991 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 430 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST PENNSYLVANIA ...SOUTHERN BUCKS COUNTY STORM SPOTTER REPORTS AT 345 PM FROM THE WARRINGTON AREA IN SOUTHWESTERN BUCKS COUNTY INDICATED A THUNDERSTORM WITH WIND GUSTS TO NEAR 60 MPH. THIS THUNDERSTORM IS MOVING EAST AT 20 TO 25 MPH AND WILL PASS THROUGH SOUTHERN BUCKS COUNTY BETWEEN NOW AND 430 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.
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, Jun 16, 11:26 AM EDT, 4 hours 31 minutes before
PAZ012-NJZ002-280600- SPECIAL WEATHER STATEMENT - THUNDERSTORM POTENTIAL NATIONAL WEATHER SERVICE PHILADELPHIA PA 11 25 AM EDT SUN JUN 16 1991 A COLD FRONT EXTENDS FROM A LOW PRESSURE AREA NEAR LAKE HURON SOUTHWESTWARD TO NORTHERN ARKANSAS THEN TO THE TEXAS PANHANDLE. AHEAD OF THIS FRONT IS A HOT...MOIST AND UNSTABLE AIRMASS. THUNDERSTORMS WILL DEVELOP LATER THIS AFTERNOON AND BE SCATTERED FROM NEW ENGLAND SOUTH TO THE GULF OF MEXICO. SKIES ARE MOSTLY SUNNY OVER SOUTHEASTERN PENNSYLVANIA AND SOUTHERN NEW JERSEY LATE THIS SUNDAY MORNING. DURING THE AFTERNOON SCATTERED CLOUDS WILL FORM WHICH COULD DEVELOP INTO THUNDERSTORMS ANYTIME AFTER 2PM. STORMS COULD DEVELOP ANYWHERE OVER THE FORECAST AREA...BUT ARE MOST LIKELY OVER NORTHEASTERN PENNSYLVANIA. MOVEMENT OF THE STORMS WILL BE FROM NORTHWEST TO SOUTHEAST AT 15 TO 20 MPH. STORMS WITH HAIL AND/OR STRONG AND GUSTY WINDS WILL MOST LIKELY BE OVER SOUTHERN PENNSYLVANIA AND SOUTHERN NEW JERSEY ANYTIME AFTER 4 PM. IF THREATENING WEATHER APPROACHES...SEEK IMMEDIATE SHELTER INDOORS... BUT DO NOT STAND NEAR WINDOWS. MOBILE HOMES ARE MOST VULNERABLE TO HIGH WINDS AND SHOULD BE AVOIDED IF AT ALL POSSIBLE. IF OUTDOORS AVOID TREES IF LIGHTNING IS OCCURRING. JEJ
Special weather statement, Jun 16, 2:11 PM EDT, 1 hour 46 minutes before
DEZ003-002-001-162015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 210 PM EDT SUN JUN 16 1991 ...SEVERE THUNDERSTORM WATCH ISSUED FOR DELAWARE... THE NATIONAL SEVERE STORMS FORECAST CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR DELAWARE AND ADJACENT COSTAL WATERS EFFECTIVE THIS SUNDAY AFTERNOON UNTIL 8 PM THIS EVENING. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES WEST SOUTHWEST OF RICHMOND VIRGINIA TO 40 MILES NORTH NORTHEAST OF LAKEHURST NEW JERSEY. 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 LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. LYLES
Special weather statement, Jun 16, 2:37 PM EDT, 1 hour 20 minutes before
PAZ012-NJZ002-160000- SPECIAL WEATHER STATEMENT - THUNDERSTORM WATCH NATIONAL WEATHER SERVICE PHILADELPHIA PA 235 PM EDT SUN JUN 16 1991 A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FROM 230 PM EDT UNTIL 8 PM EDT FOR SOUTHEAST PENNSYLVANIA AND CENTRAL AND SOUTHERN NEW JERSEY. A COLD FRONT APPROACHING WESTERN PENNSYLVANIA THROUGH CENTRAL OHIO EARLY THIS AFTERNOON IS MOVING TO THE EAST INTO UNSTABLE AIR OVER EASTERN PENNSYLVANIA AND NEW JERSEY. THUNDERSTORMS...SOME SEVERE ARE EXPECTED TO DEVELOP OVER SOUTHEAST PENNSYLVANIA AND SOUTHERN NEW JERSEY. AS OF 230 PM WEATHER SEARCH RADAR AND WEATHER SATELLITE SHOWS AN INCREASE IN THUNDERSTORM DEVELOPMENT FROM THE WILKESBARRE PENNSYLVANIA AREA SOUTHWEST ACROSS SOUTHEAST PENNSYLVANIA TO WEST OF WASHINGTON DC. THE THUNDERSTORMS WILL CONTINUE TO INCREASE IN INTENSITY AND COVERAGE AS THEY MOVE EAST SOUTHEAST ABOUT 25 MPH. IF THREATENING WEATHER APPROACHES...SEEK IMMEDIATE SHELTER INDOORS... BUT DO NOT STAND NEAR WINDOWS. MOBILE HOMES ARE MOST VULNERABLE TO HIGH WINDS AND SHOULD BE AVOIDED IF AT ALL POSSIBLE. IF OUTDOORS AVOID TREES IF LIGHTNING IS OCCURRING. PLEASE KEEP TUNED TO YOUR LOCAL RADIO OR TELEVISION STATION OR NOAA WEATHE:R RADIO SHOULD A WARNING BE ISSUED BY THE NATIONAL WEATHER SERVICE. MR
Special weather statement, Jun 16, 3:12 PM EDT, 45 minutes before
PAZ011-016- 162100 - SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALLENTOWN PA 310 PM EDT SUN JUN 16 1991 ...THUNDERSTORMS MOVING THROUGH EAST CENTRAL PENNSYLVANIA... AT 300 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED NUMEROUS SHOWERS AND THUNDERSTORMS DEVELOPING AND MOVING ACROSS MUCH OF EAST CENTRAL PENNSYLVANIA THIS AFTERNOON. THESE STORMS STRECHED FROM WILKES-BARRE SOUTHWEST TO NEAR ALTOONA AND WERE MOVING SOUTHEAST AT 25 MPH. A SECOND CLUSTER OF THUNDERSTORMS WAS LOCATED BETWEEN READING AND PHILADELPHIA. A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 8 PM EDT FOR PORTIONS OF SOUTHEASTERN PENNSYLVANIA AND MUCH OF NEW JERSEY BUT IT DOES NOT INCLUDE EITHER THE LEHIGH VALLEY OR POCONOS REGIONS. PERSONS IN BERKS...LEHIGH AND NORTHAMTON COUNTIES SHOULD CONTINUE TO MONITOR THE DEVELOPING WEATHER SITUATION BECAUSE SEVERE WEATHER CAN DEVELOP IN AND CLOSE TO THE WATCH AREA. LISTEN TO NOAA WEATHER RADIO...LOCAL TELEVISION ASND RADIO STATIONS FOR THE LATEST STATEMENTS AND UPDATES ON THE DEVELOPING SITUATION. BLACKBURN
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 16, 3:47 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 43 min |
| Jun 16, 4:16 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 29 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive.