Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1993
Severe Thunderstorm Warning 28, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 1993, 9:57 PM EDT for Montgomery County, Pennsylvania. It was in force for 33 min.
The area
The counties it named.
The facts
- Issued
- Jul 14, 1993, 9:57 PM EDT (01:57 UTC)
- Expired
- Jul 14, 1993, 10:30 PM EDT
- In force
- 33 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Montgomery County, PA
The nearest sounding before it
Atlantic City In, NJ (KACY), launched 00:00Z, 2.0 hours before the alert went out and 112 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
- 632 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 738 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 215 m²/s²
- 0-3 km storm-relative helicity
- 278 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 7.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 150157 SVRPHL PAC091-150230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA PA 957 PM EDT WED JUL 14 1993 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1030 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST PENNSYLVANIA ...EASTERN MONTGOMERY COUNTY WEATHER RADAR SHOWED A SEVERE THUNDERSTORM MOVING THROUGH CENTRAL MONTGOMERY COUNTY...TOWARD THE SOUTHEAST AT ABOUT 20 MPH. A STORM SPOTTER IN LANSDALE REPORTED A WIND GUST OF 59 MPH AT 1050 PM. THIS STORM MAY ALSO PRODUCE LARGE HAIL AND LOCALLY HEAVY RAIN. 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. KRAUS &
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 14, 9:06 PM EDT, 51 minutes before
PAZ011-016-150300 - SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALLENTOWN PA...CORRECTED. 905 PM EDT WED JUL 14 1993 ...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL PENNSYLVANIA AND THE POCONOS HAS EXPIRED... ...THUNDERSTORMS MOVING THROUGH THE LEHIGH VALLEY METROPOLITAN AREA... THE SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL PENNSYLVANIA AND THE POCONOS EXPIRED AT 9PM. THIS MEANS THE THREAT OF SEVERE WEATHER HAS DIMINISHED ACROSS THE REGION. ALTHOUGH THE THREAT OF SEVERE THUNDERSTORMS HAS ENDED...SHOWERS AND THUNDERSTORMS CONTINUE TO MOVE ACROSS THE LEHIGH VALLEY METROPOLITAN REGION. NATIONAL WEATHER SERVICE RADAR INDICATES SHOWERS AND THUNDERSTORMS EXTENDING ACROSS NORTHAMPTON...LEHIGH AND BERKS COUNTIES. THE STRONGEST STORMS WERE LOCATED OVER BERKS COUNTY NEAR SHILLINGTON AND SOUTH OF KUTZTOWN BETWEEN FLEETWOOD AND FREDERICKSVILLE. THE THUNDERSTORMS STILL HAVE THE CAPABILITY OF PRODUCING LOCALLY HEAVY DOWNPOURS AND CLOUD TO GROUND LIGHTNING. SHOWERS AND THUNDERSTORMS SHOULD END BY MIDNIGHT WITH GRADUAL CLEARING OVERNIGHT. MILLER
Special weather statement, Jul 14, 9:17 PM EDT, 40 minutes before
PAZ012-NJZ002-150300- SPECIAL WEATHER STATEMENT - THUNDERSTORMS NATIONAL WEATHER SERVICE PHILADELPHIA PA 915 PM EDT WED JUL 14 1993 ...SEVERE THUNDERSTORM WATCH EXPIRED AS OF 900 PM... ...THUNDERSTORMS WITH LOCALLY HEAVY RAIN MOVING INTO NORTHERN CHESTER AND MONTGOMERY COUNTIES... THE SEVERE THUNDERSTORM WATCH THAT HAD BEEN IN EFFECT FOR THE ENTIRE PHILADELPHIA METROPOLITAN AREA EXPIRED AS OF 900 PM. HOWEVER...SCATTERED SHOWERS AND THUNDERSTORMS CONTINUE ACROSS THE AREA. AT 910 PM...NATIONAL WEATHER SERVICE RADAR SHOWED THE STRONGEST STORM IN SOUTHERN BERKS COUNTY NEAR READING. THIS STORM WAS MOVING TOWARD THE EAST-SOUTHEAST AT ABOUT 20 MPH...INTO NORTHERN CHESTER AND MONTGOMERY COUNTIES. THIS STORM WAS LIKELY DROPPING LOCALLY HEAVY RAIN...AND COULD PRODUCE WIND GUSTS OF NEAR 40 MPH AS WELL AS SMALL HAIL. IF IT HOLDS TOGETHER... IT WILL MOVE THROUGH MONTGOMERY AND NORTHERN CHESTER COUNTIES BY 1000 PM...AND COULD APPROACH WESTERN SECTIONS OF PHILADELPHIA. IF THREATENING WEATHER IS SIGHTED...SEEK SHELTER IMMEDIATELY. IF YOU SEE LARGE HAIL OR WIND DAMAGE...NOTIFY YOUR LOCAL LAW ENFORCEMENT AGENCY AND ASK THEM TO RELAY THE REPORTS TO THE LOCAL NATIONAL WEATHER SERVICE OF~FICE. STORM SPOTTERS...PLEASE CALL IN ANY REPORTS OF SEVERE WEATHER. KRAUS
Special weather statement, Jul 14, 9:30 PM EDT, 27 minutes before
NJZ003-004-006-501-DEZ501-150245- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 930 PM EDT WED JUL 14 1993 ...THE SEVERE THUNDERSTORM WATCH HAS BEEN ALLOW TO EXPIRE... AT 930 PM...OUR WEATHER SEARCH RADAR SHOWED THUNDERSTORMS WITH VERY HEAVY RAIN...GUSTY WINDS...FREQUENT LIGHTNING AND POSSIBLE SMALL HAIL FROM THE NORTHERN SECTIONS OF MARYLAND AND DELAWARE UP TO BOYERSTOWN AND ALLENTOWN. OTHER SHOWERS AND THUNDERSTORMS WERE LOCATED ACROSS PARTS OF NEW JERSEY SOUTHEAST MARYLAND...SOUTHERN NEW YORK AND OFF-SHORE. MOVEMENT WAS EAST TO EASTSOUTHEAST AT 25 MILES AN HOUR. IF THREATENING WEATHER APPROACHES...BE PREPARED TO SEEK SHELTER IMMEDIATELY. LISTEN FOR LATER STATEMENTS OR WARNINGS FROM THE NATIONAL WEATHER SERVICE ATLANTIC CITY NEW JERSEY. MCDONALD
Special weather statement, Jul 14, 9:34 PM EDT, 23 minutes before
DEZ003-002-001-150230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 935 PM EDT WED JUL 14 1993 ...SEVERE THUNDERSTORM WATCH EXPIRED AT 9 PM... ...THUNDERSTORMS MOVING THROUGH DELAWARE... THE SEVERE THUNDERSTORM WATCH FOR DELAWARE AND ADJACENT COASTAL WATERS EXPIRED AT 9 PM. SCATTERED THUNDERSTORMS CONTINUE TO MOVE THROUGH THE FIRST STATE THIS EVENING. AT 920 PM RADAR SHOWED THUNDERSTORMS WITH LOCALLY HEAVY RAIN SCATTERED OVER NEW CASTLE AND KENT COUNTIES. OTHER THUNDERSTORMS WERE OVER QUEEN ANNES COUNTY MARYLAND AND WOULD BE MOVING INTO KENT COUNTY DELAWARE SHORTLY. THESE STORMS ARE WEAKENING AS THE MOVE EAST AT ABOUT 30 MPH AND WILL APPROACH THE COASTAL WATERS AROUND 10 PM. PERSONS IN THE PATH OF THE APPROACHING STORMS SHOULD FIND SHELTER UNTIL THE STORMS PASS OR DISSIPATE. MOTORIST SHOULD USE CAUTION WHEN DRIVING AND ALLOW EXTRA TIME FOR REACHING DESTINATIONS. STAY TUNED TO THE NOAA WEATHER RA|DIO AND LOCAL TV AND RADION STATIONS FOR FURTHER UPDATES. LYLES
Special weather statement, Jul 14, 9:35 PM EDT, 22 minutes before
DEZ003-002-001-150230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON DE 935 PM EDT WED JUL 14 1993 ...SEVERE THUNDERSTORM WATCH EXPIRED AT 9 PM... ...THUNDERSTORMS MOVING THROUGH DELAWARE... THE SEVERE THUNDERSTORM WATCH FOR DELAWARE AND ADJACENT COASTAL WATERS EXPIRED AT 9 PM. SCATTERED THUNDERSTORMS CONTINUE TO MOVE THROUGH THE FIRST STATE THIS EVENING. AT 920 PM RADAR SHOWED THUNDERSTORMS WITH LOCALLY HEAVY RAIN SCATTERED OVER NEW CASTLE AND KENT COUNTIES. OTHER THUNDERSTORMS WERE OVER QUEEN ANNES COUNTY MARYLAND AND WOULD BE MOVING INTO KENT COUNTY DELAWARE SHORTLY. THESE STORMS ARE WEAKENING AS THE MOVE EAST AT ABOUT 30 MPH AND WILL APPROACH THE COASTAL WATERS AROUND 10 PM. PERSONS IN THE PATH OF THE APPROACHING STORMS SHOULD FIND SHELTER UNTIL THE STORMS PASS OR DISSIPATE. MOTORIST SHOULD USE CAUTION WHEN DRIVING AND ALLOW EXTRA TIME FOR REACHING DESTINATIONS. STAY TUNED TO THE NOAA WEATHER RADIO AND LOCAL TV AND RADION STATIONS FOR FURTHER UPDATES. LYLES
Special weather statement, Jul 14, 9:48 PM EDT, 9 minutes before
NJZ003-004-006-501-DEZ501-150245- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 930 PM EDT WED JUL 14 1993 ...THE SEVERE THUNDERSTORM WATCH HAS BEEN ALLOW TO EXPIRE... AT 930 PM...OUR WEATHER SEARCH RADAR SHOWED THUNDERSTORMS WITH VERY HEAVY RAIN...GUSTY WINDS...FREQUENT LIGHTNING AND POSSIBLE SMALL HAIL FROM THE NORTHERN SECTIONS OF MARYLAND AND DELAWARE UP TO BOYERSTOWN AND ALLENTOWN. OTHER SHOWERS AND THUNDERSTORMS WERE LOCATED ACROSS PARTS OF NEW JERSEY SOUTHEAST MARYLAND...SOUTHERN NEW YORK AND OFF-SHORE. MOVEMENT WAS EAST TO EASTSOUTHEAST AT 25 MILES AN HOUR. IF THREATENING WEATHER APPROACHES...BE PREPARED TO SEEK SHELTER IMMEDIATELY. LISTEN FOR LATER STATEMENTS OR WARNINGS FROM THE NATIONAL WEATHER SERVICE ATLANTIC CITY NEW JERSEY. MCDONALD
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 10:06 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 54 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.