Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 90, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 1994, 3:59 PM EDT for Berks County, Montgomery County, Pennsylvania. It was in force for 46 min.
The area
The counties it named.
The facts
- Issued
- Aug 13, 1994, 3:59 PM EDT (19:59 UTC)
- Expired
- Aug 13, 1994, 4:45 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Berks County, PA, Montgomery County, PA
The nearest sounding before it
Atlantic City In, NJ (KACY), launched 12:00Z, 8.0 hours before the alert went out and 137 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
- 1816 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 906 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 121 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 132006 RRA SVRPHL PAC011-091-132045- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 359 PM EDT SAT AUG 13 1994 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 445 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN EAST CENTRAL PENNSYLVANIA ...SOUTHEASTERN BERKS COUNTY IN SOUTHEAST PENNSYLVANIA ...NORTHWESTERN MONTGOMERY COUNTY AT 400 PM RADAR SHOWED A STRONG THUNDERSTORM OVER DOUGLASS TOWNSHIP SOUTHEAST BERKS COUNTY. IT WAS MOVING EAST NORTHEAST 25 TO 30 MPH. THE STORM WILL MOVE INTO MONTGOMERY COUNTY WITHIN THE NEXT 20 MINUTES. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR A LARGE PART OF EASTERN PENNSYLVANIA UNTIL 8 PM EDT. 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, Aug 13, 2:42 PM EDT, 1 hour 17 minutes before
NJZ019>026-501-131945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 240 PM EDT SAT AUG 13 1994 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR OCEAN, BURLINGTON, ATLANTIC, CUMBERLAND, AND CAPE MAY COUNTIES, INCLUDING ADJACENT COASTAL WATERS, UNTIL 800 PM... AT 230 PM...THERE WERE NO THUNDERSTORMS WITHIN 100 MILES OF ATLANTIC CITY. HOWEVER, ANY THUNDERSTORM THAT DOES DEVELOP THIS AFTERNOON AND EVENING HAS THE POTENTIAL TO PRODUCE DAMAGING WIND AND HAIL...SO BE ON THE LOOKOUT. FRANKLIN
Special weather statement, Aug 13, 2:42 PM EDT, 1 hour 17 minutes before
DEZ001-002-140045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 242 PM EDT SAT AUG 13 1994 ...SEVERE THUNDERSTORM WATCH FOR NORTHERN DELAWARE... THE NATIONAL SEVERE STORMS FORECAST CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH EFFECTIVE UNTIL 8 PM THIS EVENING FOR NORTHERN DELAWARE TO INCLUDE NEW CASTLE AND KENT COUNTIES AND ADJACENT COASTAL WATERS. LARGE HAIL...DANGEROUS LIGHTNING AND DAMAGING THUNDERSTORM WINDS ARE POSSIBLE IN THESE AREA. A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREA SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN TO NOAA WEATHER RADIO AND LOCAL TV AND RADIO STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS. LYLES NNNN
Special weather statement, Aug 13, 2:55 PM EDT, 1 hour 4 minutes before
PAZ037>071-NJZ015>026-140000- SPECIAL WEATHER STATEMENT - SEVERE THUNDERSTORM WATCH/HEAVY RAIN NATIONAL WEATHER SERVICE PHILADELPHIA PA/MOUNT HOLLY NJ 255 PM EDT SAT AUG 13 1994 ....SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 800 PM EDT... THE NATIONAL SEVERE STORMS FORECAST CENTER IN KANSAS CITY HAS ISSUED A SEVERE THUNDERSTORM WATCH EFFECTIVE UNTIL 800 PM EDT THIS SATURDAY EVENING FOR MOST OF EASTERN PENNSYLVANIA AND ALL OF SOUTHERN NEW JERSEY. THE ONLY EASTERN PENNSYLVANIA COUNTIES...EXCLUDED...FROM THE WATCH AREA ARE...BRADFORD...CLINTON...LYCOMING...SULLIVAN AND TIOGA. AT 245 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED A LARGE AREA OF SHOWERS AND THUNDERSTORMS COVERING MUCH OF WESTERN AND NORTH CENTRAL PENNSYLVANIA. THE SOUTHERN EDGE OF THIS PRECIPITATION AREA EXTENDED FROM NEAR PITTSBURGH NORTHEAST THROUGH SUSQUEHANNA COUNTY. HEAVY RAIN HAS OCCURRED IN PARTS OF WESTERN PENNSYLVANIA WITH THIS AREA. TRAINING OF THESE THUNDERSTORM MAY ALSO PRODUCE AROUND TWO /2.0/ INCHES OF RAINFALL IN A SHORT PERIOD OF TIME IN PARTS OF EASTERN PENNSYLVANIA. THE SPECIFIC REGIONS MOST PRONE TO HEAVY RAIN INCLUDE THE MIDDLE AND UPPER SUSQUEHANNA VALLEY...PARTS OF THE LEHIGH VALLEY...NORTHEAST AND POCONOS. DOPPLER RADAR ALSO INDICATED THUNDERSTORM DEVELOPMENT NEAR HAGARSTOWN MARYLAND AND WHEELING WEST VIRGINIA...SOUTH OF THE WIDESPREAD PRECIPITATION AREA. THESE THUNDERSTORMS...AS WELL AS OTHERS THAT MAY DEVELOP IN THE HOT AND HUMID AIRMASS...MAY EFFECT THE WEATHER IN THE REMAINDER OF THE WATCH AREA INCLUDING SOUTHERN PENNSYLVANIA AND SOUTHERN NEW JERSEY LATER THIS AFTERNOON AND EVENING. SEVERE THUNDERSTORMS PRODUCE LARGE DAMAGING HAIL 3/4 OF AN INCH OR LARGER IN DIAMETER...DAMAGING THUNDERSTORMS WINDS OF 58 MPH OR GREATER AND DANGEROUS CLOUD TO GROUND LIGHTING. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE WEATHER IN AND CLOSE TO THE WATCH AREA. IF YOU LIVE IN OR NEAR THE AREA...BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. ALSO...THUNDERSTORM ACTIVITY IN THE PRESENT AIRMASS HAS THE POTENTIAL TO PRODUCE COPIOUS AMOUNTS OF RAINFALL IN A SHORT PERIOD OF TIME. AS A RESULT...THE POTENTIAL EXISTS FOR FLOODING IN URBAN AND POOR DRAINAGE LOCATIONS. RAPID RISES ON STREAMS AND CREEKS SHOULD ALSO BE MONITORED. DCY
Special weather statement, Aug 13, 2:59 PM EDT, 1 hour before
PAZ037>071-NJZ015>026-140000- SPECIAL WEATHER STATEMENT - SEVERE THUNDERSTORM WATCH/HEAVY RAIN NATIONAL WEATHER SERVICE PHILADELPHIA PA/MOUNT HOLLY NJ 255 PM EDT SAT AUG 13 1994 ....SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 800 PM EDT... THE NATIONAL SEVERE STORMS FORECAST CENTER IN KANSAS CITY HAS ISSUED A SEVERE THUNDERSTORM WATCH EFFECTIVE UNTIL 800 PM EDT THIS SATURDAY EVENING FOR MOST OF EASTERN PENNSYLVANIA AND ALL OF SOUTHERN NEW JERSEY. THE ONLY EASTERN PENNSYLVANIA COUNTIES...EXCLUDED...FROM THE WATCH AREA ARE...BRADFORD...CLINTON...LYCOMING...SULLIVAN AND TIOGA. AT 245 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED A LARGE AREA OF SHOWERS AND THUNDERSTORMS COVERING MUCH OF WESTERN AND NORTH CENTRAL PENNSYLVANIA. THE SOUTHERN EDGE OF THIS PRECIPITATION AREA EXTENDED FROM NEAR PITTSBURGH NORTHEAST THROUGH SUSQUEHANNA COUNTY. HEAVY RAIN HAS OCCURRED IN PARTS OF WESTERN PENNSYLVANIA WITH THIS AREA. TRAINING OF THESE THUNDERSTORM MAY ALSO PRODUCE AROUND TWO /2.0/ INCHES OF RAINFALL IN A SHORT PERIOD OF TIME IN PARTS OF EASTERN PENNSYLVANIA. THE SPECIFIC REGIONS MOST PRONE TO HEAVY RAIN INCLUDE THE MIDDLE AND UPPER SUSQUEHANNA VALLEY...PARTS OF THE LEHIGH VALLEY...NORTHEAST AND POCONOS. DOPPLER RADAR ALSO INDICATED THUNDERSTORM DEVELOPMENT NEAR HAGARSTOWN MARYLAND AND WHEELING WEST VIRGINIA...SOUTH OF THE WIDESPREAD PRECIPITATION AREA. THESE THUNDERSTORMS...AS WELL AS OTHERS THAT MAY DEVELOP IN THE HOT AND HUMID AIRMASS...MAY EFFECT THE WEATHER IN THE REMAINDER OF THE WATCH AREA INCLUDING SOUTHERN PENNSYLVANIA AND SOUTHERN NEW JERSEY LATER THIS AFTERNOON AND EVENING. SEVERE THUNDERSTORMS PRODUCE LARGE DAMAGING HAIL 3/4 OF AN INCH OR LARGER IN DIAMETER...DAMAGING THUNDERSTORMS WINDS OF 58 MPH OR GREATER AND DANGEROUS CLOUD TO GROUND LIGHTING. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE WEATHER IN AND CLOSE TO THE WATCH AREA. IF YOU LIVE IN OR NEAR THE AREA...BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. ALSO...THUNDERSTORM ACTIVITY IN THE PRESENT AIRMASS HAS THE POTENTIAL TO PRODUCE COPIOUS AMOUNTS OF RAINFALL IN A SHORT PERIOD OF TIME. AS A RESULT...THE POTENTIAL EXISTS FOR FLOODING IN URBAN AND POOR DRAINAGE LOCATIONS. RAPID RISES ON STREAMS AND CREEKS SHOULD ALSO BE MONITORED. DCY
Special weather statement, Aug 13, 3:45 PM EDT, 14 minutes before
NJZ019>026-501-132045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 345 PM EDT SAT AUG 13 1994 ...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM... AT 330 PM...THERE WERE NO THUNDERSTORMS ACROSS SOUTHERN NEW JERSEY AND THE ADJACENT COASTAL WATERS. MEANWHILE...THUNDERSTORMS, SOME WITH VERY HEAVY RAIN, WERE SCATTERED ACROSS MARYLAND AND SOUTHERN PENNSYLVANIA. THEY WILL REACH SOUTHEASTERN NEW JERSEY AFTER 600 PM. KEEP IN MIND THAT ANY THUNDERSTORM THIS AFTERNOON AND EVENING HAS THE POTENTIAL TO PRODUCE DAMAGING WIND AND HAIL...SO BE ON THE LOOKOUT. FRANKLIN
Special weather statement, Aug 13, 3:47 PM EDT, 12 minutes before
NJZ019>026-501-132045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 345 PM EDT SAT AUG 13 1994 ...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM... AT 330 PM...THERE WERE NO THUNDERSTORMS ACROSS SOUTHERN NEW JERSEY AND THE ADJACENT COASTAL WATERS. MEANWHILE...THUNDERSTORMS, SOME WITH VERY HEAVY RAIN, WERE SCATTERED ACROSS MARYLAND AND SOUTHERN PENNSYLVANIA. THEY WILL REACH SOUTHEASTERN NEW JERSEY AFTER 600 RPM. KEEP IN MIND THAT ANY THUNDERSTORM THIS AFTERNOON AND EVENING HAS THE POTENTIAL TO PRODUCE DAMAGING WIND AND HAIL...SO BE ON THE LOOKOUT. FRANKLIN
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 4:35 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 40 min |
| Aug 13, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 54 min |
| Aug 13, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 33 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1994Every severe thunderstorm warning in 1994
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.