Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 96, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 14, 1994, 2:25 PM EDT for Chester County, Montgomery County, Pennsylvania. It was in force for 50 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 14, 1994, 2:25 PM EDT (18:25 UTC)
- Expired
- Aug 14, 1994, 3:15 PM EDT
- In force
- 50 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Chester County, PA, Montgomery County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 14, 3:10 PM EDT | Tornado F1 | Norristown, PA | ,,,,,,,,Lightning A F1 (Fujita Scale) tornado touched down in the Brandywine Village/Lafayette Park area of Upper Merion Township on Allendale Road just to the north of the Pennsylvania Turnpike (Interstate 276). The tornado sighting was phoned into the Natio |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Atlantic City In, NJ (KACY), launched 12:00Z, 6.4 hours before the alert went out and 115 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
- 243 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 1037 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 141828 RRA SVRPHL PAC029-091-141915- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA PA/MOUNT HOLLY NJ 225 PM EDT SUN AUG 14 1994 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 315 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEASTERN PENNSYLVANIA ...NORTHERN CHESTER COUNTY...MONTGOMERY COUNTY AT 220 PM...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM IN NORTHERN CHESTER COUNTY. THE THUNDERSTORM IS MOVING TO THE EAST NORTHEAST AROUND 40 MPH...AND IT SHOULD MOVE INTO CENTRAL MONTGOMERY COUNTY BY 3 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. A TORNADO WATCH CONTINUES FOR EAST CENTRAL PENNSYLVANIA AND FOR THE PHILADELPHIA METROPOLITAN AREA UNTIL 730 PM EDT. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED WARNING. IOVINO $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 2:55 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 50 min |
| Aug 14, 3:15 PM EDT | Tornado Warning | PHI | Montgomery | 30 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.