Alert archive / Pennsylvania / Tornado Warnings in 2002
Tornado Warning 11, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at Jun 6, 2002, 7:47 PM EDT for Chester County, Delaware County, Montgomery County, Pennsylvania. It was in force for 28 min. 2 reports 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
- Jun 6, 2002, 7:47 PM EDT (23:47 UTC)
- Expired
- Jun 6, 2002, 8:15 PM EDT
- In force
- 28 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 94 km from the middle of the area, began a volume at 23:51 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 6, 7:50 PM EDT | Thunderstorm Wind 50 E | Broomall, PA | |
| Jun 6, 7:50 PM EDT | Thunderstorm Wind 50 E | Norristown, PA |
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.
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.8 hours before the alert went out and 81 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
- 326 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1175 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS51 KPHI 062347 TORPHI PAC029-045-091-070015- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 747 PM EDT THU JUN 6 2002 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * TORNADO WARNING FOR... NORTHERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA EAST CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 815 PM EDT. * AT 746 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG ROTATION OVER PAOLI...MOVING NORTHEAST AT 20 MPH. THIS STORM COULD PRODUCE A TORNADO AT ANY TIME. * THE TORNADO IS EXPECTED TO BE NEAR... RADNOR TOWNSHIP...DREXEL HILL AT 755 PM. BRYN MAWR AT 800 PM. KING OF PRUSSIA AT 805 PM. NORRISTOWN AT 810 PM. PLYMOUTH MEETING...AMBLER AT 815 PM. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE TELEVISION OUTLET. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM THURSDAY EVENING FOR SOUTHWESTERN DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY. $$ LAT...LON 4005 7572 3987 7567 3994 7530 4020 7519
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 6:55 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 50 min |
| Jun 6, 7:36 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 39 min |
Nearby
Tornado Warnings in Pennsylvania, 2002Every tornado warning in 2002Tornadoes in 2002
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; radar from the NEXRAD Level II archive.