Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 68, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 1994, 5:32 PM EDT for Chester County, Pennsylvania. It was in force for 43 min.
The area
The counties it named.
The facts
- Issued
- Jul 14, 1994, 5:32 PM EDT (21:32 UTC)
- Expired
- Jul 14, 1994, 6:15 PM EDT
- In force
- 43 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Chester County, PA
The nearest sounding before it
Atlantic City In, NJ (KACY), launched 12:00Z, 9.5 hours before the alert went out and 122 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
- 651 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1094 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 75 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 142137 SVRPHL PAC029-142215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 532 PM EDT THU JUL 14 1994 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 615 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST PENNSYLVANIA ...CHESTER COUNTY NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EASTERN LANCASTER WAS ABOUT TO MOVE INTO CHESTER COUNTY NEAR ATGLEN AND WEST FALLOWFIELD. THIS STORM WAS MOVING EAST AT ABOUT 25 MILES PER HOUR AND WITH THE PRESENT MOTION SHOULD PASS JUST TO THE SOUTH OF COATESVILLE AND DOWNINGTOWN. HEAVY RAINS WITH THIS THUNDERSTORM MAY CAUSE FLOODING OF SMALL STREAMS AND UNDERPASSES VERY QUICKLY. DO NOT DRIVE YOUR CAR INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER MAY BE DEEPER THAN YOU THINK. IF CAUGHT IN RISING WATERS...ABANDON YOUR CAR QUICKLY. MOVE TO HIGHER GROUND.
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, 1:28 PM EDT, 4 hours 4 minutes before
PAZ 048-054-055-058-060-061-062-142000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALLENTOWN PA 130 PM EDT WED JUL 13 1994 ...INTENSE THUNDERSTORMS MOVING INTO BERKS COUNTY... AT 125 PM EDT NATIONAL WEATHER SERVICE RADAR WAS SHOWING A LINE OF INTENSE THUNDERSTORMS MOVING INTO SOUTHERN BERKS COUNTY. THESE STORMS ARE MOVING TO THE NORTHEAST AT 12 MPH. THESE STORMS COULD PRODUCE DANGEROUS LIGHTNING...LOCALLY HEAVY RAINS...STRONG GUSTY WINDS AND HAIL. PERSONS SHOULD STAY TUNED TO NOAA WEATHER RADIO...LOCAL TELEVISION AND RADIO STATIONS FOR FURTHER STATEMENTS ON THESE DEVELOPING THUNDERSTORMS. CPB
Special weather statement, Jul 14, 2:57 PM EDT, 2 hours 35 minutes before
PAZ067>071-NJZ015>019-142100- SPECIAL WEATHER STATEMENT/SHORT TERM FORECAST NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 255 PM EDT THU JUL 14 1994 ...LINE OF SHOWERS AND THUNDERSTORMS moving into northern portions of the delaware valley... DOPPLER RADAR SHOWED A LINE OF SHOWERS AND THUNDERSTORMS MOVING INTO WESTERN BURLINGTON AND INTO SOUTHERN MERCER COUNTIES IN NEW JERSEY. THE LINE EXTENDED ACROSS THE DELAWARE INTO MONTGOMERY AND BUCKS COUNTIES IN PENNSYLVANIA. SHOWERS LINGERED OVER PORTION OF CAMDEN COUNTY and the city of philadelphia. some of these showers were producing locally heavy rain in a relatively short time. the heaviest rain was over southwest burlington county in new jersey and over eastern philadelphia and bucks counties in pennsylvania. movement was to the northeast at aROUND 15 MPH AND THIS WILL CONTINUE TO BRING THE LINE OF SHOWERS AND THUNDERSTORMS INTO northern bucks county and southern mercer c(ounty in the next hour. PERSONS SHOULD BE ALERT FOR THREATENING WEATHER AND HEAD INDOORS AT THE FIRST SIGN OF THUNDERSTORMS. IN ADDITION...MOTORISTS SHOULD BE WARY FOR POOR DRAINAGE FLOODING AND PONDING ON ROADWAYS. wally
Special weather statement, Jul 14, 3:23 PM EDT, 2 hours 9 minutes before
PAZ 048-054-055-058-060-061-062-142300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALLENTOWN PA 320 PM EDT WED JUL 13 1994 ...THUNDERSTORMS MOVING ACROSS EAST CENTRAL PENNSYLVANIA... AT 315 PM EDT NATIONAL WEATHER SERVICE RADAR WAS SHOWING AN AREA OF THUNDERSTORMS AND SHOWERS SPREADING OVER ALL OF THE LEHIGH VALLEY AND POCONOS REGIONS OF EAST CENTRAL PENNSYVANIA. THESE STORMS COULD PRODUCE DANGEROUS LIGHTNING...LOCALLY HEAVY RAINS...STRONG GUSTY WINDS AND HAIL. THESE STORMS WILL CONTINUE TO DEVELOP AND MOVE NORTHEAST ACROSS THE AREA AT 15 MPH. PERSONS SHOULD STAY TUNED TO NOAA WEATHER RADIO...LOCAL TELEVISION AND RADIO STATIONS FOR FURTHER STATEMENTS ON THESE DEVELOPING THUNDERRSTORMS. CPB
Special weather statement, Jul 14, 4:38 PM EDT, 54 minutes before
PAZ 048-054-055-058-060-061-062-142300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ALLENTOWN PA 438 PM EDT WED JUL 13 1994 ...THUNDERSTORMS MOVING ACROSS EAST CENTRAL PENNSYLVANIA... AT 335 PM EDT NATIONAL WEATHER SERVICE RADAR WAS SHOWING AN AREA OF THUNDERSTORMS AND SHOWERS SPREADING OVER ALL OF THE LEHIGH VALLEY AND POCONOS REGIONS OF EAST CENTRAL PENNSYVANIA. THESE STORMS COULD PRODUCE DANGEROUS LIGHTNING...LOCALLY HEAVY RAINS...STRONG GUSTY WINDS AND HAIL. THESE STORMS WILL CONTINUE TO DEVELOP AND MOVE NORTHEAST ACROSS THE AREA AT 15 MPH. SOME STREET AND FLOODING OF LOW LYING AREAS IS POSSIBLE THIS EVENING AND NIGHT. PERSONS SHOULD STAY TUNED TO NOAA WEATHER RADIO...LOCAL TELEVISION AND RADIO STATIONS FOR FURTHER STATEMENTS ON THESE DEVELOPING THUNDERSTORMS. CPB
Special weather statement, Jul 14, 5:30 PM EDT, 2 minutes before
NJZ019>026-501-142130- SPECIAL WEATHER STATEMENT...THUNDERSTORMS NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 530 PM EDT THU JUL 14 1994 AT 530 PM...ATLANTIC CITY WEATHER RADAR SHOWED A BROAD AREA OF THUNDERSTORMS FROM NORTHERN MARYLAND THROUGH MUCH OF EASTERN PENNSYLVANIA INCLUDING THE PHILADELPHIA VICINITY TO NORTHERN AND CENTRAL NEW JERSEY. WHILE THESE STORMS HAVE BEEN STAYING TO THE NORTH OF THE SOUTH JERSEY AREA...NEW THUNDERSTORM DEVELOPMENT IN NORTHERN MARYLAND...NORTHERN DELEWARE AND SOUTHEASTERN PENNSYLVANIA WILL MOVE MORE EASTWARD THAN PREVIOUS THUNDERSTORMS...AND COULD POSE A THREAT FOR SOUTHEASTERN NEW JERSEY AFTER 8 PM THIS EVENING. ANY OF THESE THUNDERSTORMS CAN PRODUCE VERY HEAVY DOWNPOURS...FREQUENT CLOUD TO GROUND LIGHTNING...WIND GUSTS PAST 50 MPH AND PERHAPS HAIL. TRM
Special weather statement, Jul 14, 5:30 PM EDT, 2 minutes before
PAZ067>071-NJZ015>019-142330- SPECIAL WEATHER STATEMENT/SHORT TERM FORECAST NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 530 PM EDT THU JUL 14 1994 ...SHOWERS AND THUNDERSTORMS CONTINUING ACROSS PHILADELPHIA AND THE NORTHWESTERN SUBURBS... DOPPLER RADAR SHOWED A VERY STRONG THUNDERSTORM OVER CENTRAL LANCASTER COUNTY JUST TO THE SOUTHEAST OF LANCASTER CITY. IT WAS MOVING EAST AT ABOUT 15 MILES AN HOUR AND SHOULD MOVE INTO CHESTER COUNTY BETWEEN 535 AND 550 PM. DOPPLER RADAR SHOWED NUMEROUS SHOWERS AND THUNDERSTORMS OVER MOST OF THE NORTHERN HALF OF CHESTER COUNTY AS WELL AS MOST OF MERCER...BUCKS AND MONTGOMERY COUNTIES. WHILE THE THUNDERSTORMS WERE SHOWING SIGNS OF LOSING THEIR SEVERE CHARACTERISTICS...THEY STILL HAVE BEEN PROLIFIC RAIN PRODUCERS DROPPING A DOPPLER ESTIMATED 1 TO 1.5 INCHES OF RAIN PER HOUR. THESE STORMS SHOULD CONTINUE TO AFFECT PHILADELPHIA AND THE NEARBY NORTHERN AND WESTERN SUBURBS DURING THE NEXT HOUR OR TWO. PERSONS SHOULD BE ALERT FOR THREATENING WEATHER AND HEAD INDOORS AT THE FIRST SIGN OF THUNDERSTORMS. IN ADDITION...MOTORISTS SHOULD BE WARY FOR POOR DRAINAGE FLOODING AND PONDING ON ROADWAYS. NEVER ATTEMPT TO DRIVE ACROSS A FLOODED: ROADWAY. MORE PERSONS ARE KILLED EACH YEAR FROM FLOODING THAN ANY OTHER METEOROLOGICAL PHENOMENA. GIGI
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 3:51 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 54 min |
| Jul 14, 3:59 PM EDT | Tornado Warning | PHI | Chester | 46 min |
| Jul 14, 4:26 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 49 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.