Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 58, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 2, 1994, 4:58 PM EDT for Chester County, Pennsylvania. It was in force for 47 min.
The area
The counties it named.
The facts
- Issued
- Jul 2, 1994, 4:58 PM EDT (20:58 UTC)
- Expired
- Jul 2, 1994, 5:45 PM EDT
- In force
- 47 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, 9.0 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
- 634 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 922 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS1 KPHL 022101 RRA SVRPHL PAC029-022145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 458 PM EDT SAT JUL 2 1994 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS EXTENDED THE SEVERE THUNDERSTORM WARNING EFFECTIVE NOW UNTIL 545 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST PENNSYLVANIA ...EASTERN CHESTER COUNTY A NATIONAL WEATHER SERVICE EMPLOYEE HAS JUST REPORTED PENNY SIZED HAIL WITH THIS SEVERE THUNDERSTORM IN DOWNINGTOWN. IN ADDITION TORRENTIAL HEAVY DOWNPOURS WERE REPORTED WITH IT. THE THUNDERSTORM WAS DRIFTING SLOWLY SOUTHEAST AT 5 TO 10 MPH AND WILL CONTINUE TO POSE THE MULTIPLE THREATS OF DAMAGING WIND GUSTS...LARGE HAIL AND TORRENTIAL DOWNPOURS ACROSS EASTERN CHESTER COUNTY. 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 2, 4:06 PM EDT, 52 minutes before
PAZ067>071-NJZ015>019-032200- SPECIAL WEATHER STATEMENT/SHORT TERM FORECAST - THUNDERSTORMS NATIONAL WEATHER SERVICE PHILADELPHIA/MT HOLLY 400 PM EDT SAT JUL 2 1994 ...THUNDERSTORMS DEVELOPING IN THE NORTHERN AND WESTERN SUBURBS OF PHILADELPHIA... AT 355 PM EDT DOPPLER RADAR SHOWED TWO INTENSIFYING THUNDERSTORMS OVER CHESTER COUNTY PENNSYLVANIA. ANOTHER THUNDERSTORM WAS ALSO DEVELOPING NEAR DOYLESTOWN IN BUCKS COUNTY. MOVEMENT WAS SLOWLY EAST TO SOUTHEAST AT 10 TO 15 MPH. PERSONS IN THE PHILADELPHIA NORTHWESTERN SUBURBS SHOULD BE ON THE ALERT FOR THUNDERSTORMS. PLEASE GET OUT OF THE WATER AND HEAD INDOORS WITH THE FIRST CRACK OF THUNDER. OTHER THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE REMAINDER OF THE GREATER PHILADELPHIA METROPOLITAN AREA THE REST OF THE AFTERNOON AND EVENING. YOUNG/GIGI
Special weather statement, Jul 2, 4:30 PM EDT, 28 minutes before
NJZ019>026-501-022100- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 430 PM EDT SAT JUL 2 1994 ...ISOLATED THUNDERSTORMS POP-UP IN THE HUMID AIRMASS... AT 430 PM...THE ATLANTIC CITY WEATHER RADAR SHOWED TWO ISOLATED THUNDERSTORMS SHOWING UP ON THE OLD (WRS-57) RADAR NEAR PHILADELPHIA IN CHESTER COUNTY AND THE OTHER ONE WAS NEAR ANNAPOLIS MARYLAND. AS WITH ANY THUNDERSTORM...THEY HAVE THE POSSIBLY OF GIVING BRIEF HEAVY DOWNPOURS AND GUSTY WINDS. THE MOVEMENT WAS TOWARD THE EAST NORTHEAST AROUND 25 MILES AN HOUR. PM
Special weather statement, Jul 2, 4:44 PM EDT, 14 minutes before
NJZ019>026-501-022100- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE ATLANTIC CITY NJ 430 PM EDT SAT JUL 2 1994 ...ISOLATED THUNDERSTORMS POP-UP IN THE HUMID AIRMASS... AT 430 PM...THE ATLANTIC CITY WEATHER RADAR SHOWED TWO ISOLATED THUNDERSTORMS SHOWING UP ON THE OLD (WRS-57) RADAR NEAR PHILADELPHIA IN CHESTER COUNTY AND THE OTHER ONE WAS NEAR ANNAPOLIS MARYLAND. AS WITH ANY THUNDERSTORM...THEY HAVE THE POSSIBLY OF GIVI(NG BRIEF HEAVY DOWNPOURS AND GUSTY WINDS. THE MOVEMENT WAS TOWARD THE EAST NORTHEAST AROUND 25 MILES AN HOUR. PM
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 4:28 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 32 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.