Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 9, 2001, 8:02 PM EDT for Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 43 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
- Apr 9, 2001, 8:02 PM EDT (00:02 UTC)
- Expired
- Apr 9, 2001, 8:45 PM EDT
- In force
- 43 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Cecil County, MD, Chester County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 9, 8:15 PM EDT | Thunderstorm Wind 52 E | Countywide, PA | |
| Apr 9, 8:15 PM EDT | Thunderstorm Wind 52 E | Conowingo, MD |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 9, 7:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 9, 7:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.0 hours before the alert went out and 161 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
- 616 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 2415 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 177 m²/s²
- 0-3 km storm-relative helicity
- 248 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 100003 SVRPHL MDC015-PAC029-100045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 802 PM EDT MON APR 9 2001 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CECIL COUNTY IN NORTHEAST MARYLAND. SOUTHWESTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA. * UNTIL 845 PM EDT. * AT 755 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM... 20 MILES NORTHWEST OF RISING SUN...MOVING SOUTHEAST AT 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... RISING SUN...OXFORD AT 810 PM. WEST GROVE AT 815 PM. NORTH EAST AT 820 PM. CECILTON AT 8330 PM. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE TELEVISION OUTLET. $$ LAT...LON 3972 7639 3939 7587 3982 7580 3991 7611
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 8:09 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 36 min |
| Apr 9, 8:09 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 36 min |
| Apr 9, 8:37 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 38 min |
| Apr 9, 8:37 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 38 min |
| Apr 9, 8:56 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 34 min |
| Apr 9, 8:56 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 34 min |
| Apr 9, 8:56 PM EDT | Severe Thunderstorm Warning | PHI | Talbot | 34 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2001Severe Thunderstorm Warnings in Maryland, 2001Every severe thunderstorm warning in 2001
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.