Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 191, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 24, 2002, 7:42 PM EDT for Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 33 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
- Aug 24, 2002, 7:42 PM EDT (23:42 UTC)
- Expired
- Aug 24, 2002, 8:15 PM EDT
- In force
- 33 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties New Castle County, DE, Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 102 km from the middle of the area, began a volume at 23:43 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 |
|---|---|---|---|
| Aug 24, 7:45 PM EDT | Thunderstorm Wind 52 E | Countywide, PA | |
| Aug 24, 8:02 PM EDT | Thunderstorm Wind 52 E | Claymont, DE |
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
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.7 hours before the alert went out and 183 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
- 639 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 611 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
475 WUUS51 KPHI 242342 SVRPHI DEC003-PAC029-045-250015- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 742 PM EDT SAT AUG 24 2002 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE. DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA. CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA. * UNTIL 815 PM EDT. * AT 733 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM... ALONG A LINE EXTENDING FROM 6 MILES NORTH OF LIONVILLE TO 4 MILES NORTHWEST OF KENNETT SQUARE TO 7 MILES SOUTHWEST OF OXFORD...MOVING SOUTHEAST AT 35 MPH. * SEVERE THUNDERSTORMS WILL BE NEAR... TALLEYVILLE AT 750 PM. RADNOR TOWNSHIP...LIMA...STANTON AT 755 PM. NETHER PROVIDENCE TOWNSHIP...BROOMALL...WILMINGTON...NEWPORT AT 800 PM. SWARTHMORE...DREXEL HILL AT 805 PM. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE TELEVISION OUTLET. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 24 min |
| Aug 24, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 33 min |
| Aug 24, 7:44 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 46 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2002Severe Thunderstorm Warnings in Delaware, 2002Every severe thunderstorm warning 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.